2026-09-11T21:18:39.642834Z  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
2026-09-11T21:19:00.105242Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: screened exchange table geometry expansion_ms=6710 expansion_and_footprint_ms=8164 estimated_row_bytes=83200 heuristic_row_bytes=145332 geometry_fragments_per_tile=9413 fragment_limit=16384
2026-09-11T21:19:00.265892Z  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=1386
2026-09-11T21:19:01.179777Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:01.179834Z  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=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.183107Z  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=22 row_words=23 horizon=2909
2026-09-11T21:19:01.205761Z  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
2026-09-11T21:19:01.205817Z  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
2026-09-11T21:19:01.211567Z  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
2026-09-11T21:19:01.217524Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:19:01.217595Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.224333Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:19:01.230957Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:01.231012Z  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=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.231785Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:19:01.231841Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.234592Z  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=13 row_words=21 horizon=2978
2026-09-11T21:19:01.235071Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:19:01.247104Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:01.247153Z  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=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.248746Z  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=3075 maximum_identical_destinations=1
2026-09-11T21:19:01.248790Z  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=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.249171Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:19:01.249219Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.250233Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:19:01.251408Z  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=146 row_words=20 horizon=8454
2026-09-11T21:19:01.253128Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=58 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:19:01.253767Z  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
2026-09-11T21:19:01.253805Z  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
2026-09-11T21:19:01.255710Z  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
2026-09-11T21:19:01.255906Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:01.255991Z  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=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.257745Z  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=13 row_words=20 horizon=2969
2026-09-11T21:19:01.262047Z  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=2013 maximum_identical_destinations=1
2026-09-11T21:19:01.262096Z  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=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.262376Z  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=11656 maximum_identical_destinations=1
2026-09-11T21:19:01.262428Z  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=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.262824Z  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=396 row_words=33 horizon=7378
2026-09-11T21:19:01.266436Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:19:01.266478Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.267818Z  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=1741 maximum_identical_destinations=1
2026-09-11T21:19:01.267849Z  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=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.268929Z  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=14 row_words=49 horizon=5913
2026-09-11T21:19:01.269640Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:19:01.269755Z  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=100 row_words=23 horizon=2561
2026-09-11T21:19:01.269769Z  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=173 row_words=112 horizon=2940
2026-09-11T21:19:01.275379Z  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=1294 maximum_identical_destinations=1
2026-09-11T21:19:01.275424Z  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=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.277118Z  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=866 row_words=10 horizon=471
2026-09-11T21:19:01.283540Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:19:01.283572Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.285028Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:19:01.290321Z  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=1224 maximum_identical_destinations=1
2026-09-11T21:19:01.290360Z  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=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.291377Z  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=47 row_words=23 horizon=374
2026-09-11T21:19:01.316347Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=64 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:19:01.340550Z  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=10001 maximum_identical_destinations=1
2026-09-11T21:19:01.340602Z  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=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.340705Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=66 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:19:01.342701Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:19:01.342735Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.344031Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:19:01.357911Z  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=127 row_words=165 horizon=16042
2026-09-11T21:19:01.361454Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:19:01.361494Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.364168Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:19:01.376021Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=72 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:19:01.445750Z  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=8694 maximum_identical_destinations=1
2026-09-11T21:19:01.445817Z  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=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.456860Z  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=1428 row_words=47 horizon=11896
2026-09-11T21:19:01.594618Z  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
2026-09-11T21:19:01.594679Z  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
2026-09-11T21:19:01.609588Z  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
2026-09-11T21:19:01.626013Z  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=4374 maximum_identical_destinations=1
2026-09-11T21:19:01.626053Z  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=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.633729Z  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=136 row_words=181 horizon=8747
2026-09-11T21:19:01.682511Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:19:01.682581Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.685913Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:19:01.708107Z  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=20656 maximum_identical_destinations=1
2026-09-11T21:19:01.708152Z  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=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.719878Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=47 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:19:01.730158Z  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=535 row_words=106 horizon=4485
2026-09-11T21:19:01.736716Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:01.736746Z  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=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.738045Z  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=79 row_words=14 horizon=4464
2026-09-11T21:19:01.751130Z  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=2181 maximum_identical_destinations=1
2026-09-11T21:19:01.751159Z  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=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.752297Z  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=94 row_words=38 horizon=8137
2026-09-11T21:19:01.754832Z  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=50544 maximum_identical_destinations=1
2026-09-11T21:19:01.754877Z  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=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.793162Z  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=473 row_words=173 horizon=11837
2026-09-11T21:19:01.843859Z  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=42920 maximum_identical_destinations=1
2026-09-11T21:19:01.843925Z  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=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.862547Z  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=297 row_words=174 horizon=1359
2026-09-11T21:19:01.872228Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=53 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:19:01.872270Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=53 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:01.877339Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=53 tile=90 row_words=107 horizon=2426
2026-09-11T21:19:02.135512Z  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=45090 maximum_identical_destinations=1
2026-09-11T21:19:02.135563Z  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=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.171344Z  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=1090 row_words=186 horizon=7433
2026-09-11T21:19:02.215866Z  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=2820 maximum_identical_destinations=1
2026-09-11T21:19:02.215902Z  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=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.219244Z  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=1452 row_words=15 horizon=3578
2026-09-11T21:19:02.245302Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:19:02.245331Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.247904Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:19:02.321717Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=42 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:19:02.364064Z  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=6561 maximum_identical_destinations=1
2026-09-11T21:19:02.364107Z  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=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.377639Z  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=104 row_words=187 horizon=8266
2026-09-11T21:19:02.432819Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:19:02.432883Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.434961Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:19:02.523702Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=52 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:19:02.523747Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=52 initial_horizon=9167 selected_horizon=9167 endpoint_lower_bound=7996 lower_bound_gap=1171 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.588043Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=52 tile=78 row_words=2149 horizon=9167
2026-09-11T21:19:02.617809Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:19:02.617855Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.619329Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:19:02.784390Z  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=51948 maximum_identical_destinations=1
2026-09-11T21:19:02.784456Z  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=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.814024Z  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=51925 maximum_identical_destinations=1
2026-09-11T21:19:02.814100Z  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=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:02.837634Z  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=356 row_words=177 horizon=850
2026-09-11T21:19:02.848675Z  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=1095 row_words=135 horizon=822
2026-09-11T21:19:02.997834Z  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=43760 maximum_identical_destinations=1
2026-09-11T21:19:02.997909Z  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=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:03.025449Z  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=96 row_words=112 horizon=2347
2026-09-11T21:19:03.273325Z  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=71168 maximum_identical_destinations=1
2026-09-11T21:19:03.273375Z  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=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:03.311966Z  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=79 row_words=268 horizon=13126
2026-09-11T21:19:03.357307Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=20 candidates=8748 ordinary_horizon=7565 paired_horizon=11978 use_paired=false
2026-09-11T21:19:03.433269Z  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=8748 maximum_identical_destinations=1
2026-09-11T21:19:03.433335Z  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=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:03.438077Z  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=66320 maximum_identical_destinations=1
2026-09-11T21:19:03.438141Z  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=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:03.454382Z  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=137 row_words=278 horizon=7565
2026-09-11T21:19:03.482792Z  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=964 row_words=285 horizon=7135
2026-09-11T21:19:04.020475Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:19:04.020540Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:04.119747Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:19:04.692448Z  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=19683 maximum_identical_destinations=1
2026-09-11T21:19:04.692510Z  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=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:04.724586Z  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=480 row_words=519 horizon=10141
2026-09-11T21:19:04.899238Z  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=7106 ordinary_horizon=6573 paired_horizon=18271 use_paired=false
2026-09-11T21:19:04.986894Z  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=7290 maximum_identical_destinations=1
2026-09-11T21:19:04.986945Z  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=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:05.012149Z  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=45 row_words=337 horizon=6573
2026-09-11T21:19:05.826593Z  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=32720 maximum_identical_destinations=1
2026-09-11T21:19:05.826654Z  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=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:05.899532Z  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=71 row_words=618 horizon=6489
2026-09-11T21:19:06.115384Z  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=6561 ordinary_horizon=16505 paired_horizon=21452 use_paired=false
2026-09-11T21:19:06.194140Z  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=127912 maximum_identical_destinations=1
2026-09-11T21:19:06.194238Z  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=9882 selected_horizon=9882 endpoint_lower_bound=6912 lower_bound_gap=2970 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:06.235461Z  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=6561 maximum_identical_destinations=1
2026-09-11T21:19:06.235509Z  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=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:06.262988Z  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=170 row_words=415 horizon=16505
2026-09-11T21:19:06.510140Z  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=70 row_words=2698 horizon=9882
2026-09-11T21:19:06.631677Z  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=112284 maximum_identical_destinations=1
2026-09-11T21:19:06.631737Z  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=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:06.742145Z  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=707 row_words=445 horizon=14301
2026-09-11T21:19:07.972741Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:19:07.972803Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:08.263728Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:19:09.517444Z  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=195689 maximum_identical_destinations=1
2026-09-11T21:19:09.517513Z  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=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:09.768466Z  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=553 row_words=658 horizon=2731
2026-09-11T21:19:10.664317Z  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=303406 maximum_identical_destinations=1
2026-09-11T21:19:10.664380Z  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=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:11.101040Z  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=109 row_words=1528 horizon=14869
2026-09-11T21:19:14.659112Z  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=155252 maximum_identical_destinations=1
2026-09-11T21:19:14.659182Z  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=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:14.770960Z  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=231 row_words=310 horizon=2258
2026-09-11T21:19:16.453238Z  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
2026-09-11T21:19:16.453306Z  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
2026-09-11T21:19:16.506586Z  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
2026-09-11T21:19:16.587668Z  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=57 success=true
2026-09-11T21:19:16.592691Z  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=4 success=true
2026-09-11T21:19:16.601991Z  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
2026-09-11T21:19:16.843578Z  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=50056 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:19:19.607721Z  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=148 success=true
2026-09-11T21:19:19.607823Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: placing generated tile programs linked_end=385664 host_code_base=385664 host_code_bytes=9092 generated_code_bytes=16480 exchange_table_bytes=50056 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (382676, 382680), (384692, 384696), (394824, 524288)]
2026-09-11T21:19:19.607885Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: allocated package support memory linked_end=385664 profile_bytes=1068 exchange_table_bytes=50056 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16480 code_address=394824 available_ranges=[(327680, 360448), (368488, 376832), (491520, 524288), (525356, 949168)]
2026-09-11T21:19:20.364406Z  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=756 success=true
2026-09-11T21:19:20.388254Z  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
2026-09-11T21:19:20.396669Z  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
2026-09-11T21:19:20.397566Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:20.397589Z  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=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.398279Z  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
2026-09-11T21:19:20.399596Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:20.399626Z  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=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.399958Z  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=13 row_words=21 horizon=2978
2026-09-11T21:19:20.402886Z  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=79 row_words=14 horizon=4464
2026-09-11T21:19:20.403842Z  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
2026-09-11T21:19:20.406145Z  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
2026-09-11T21:19:20.406192Z  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
2026-09-11T21:19:20.412002Z  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
2026-09-11T21:19:20.429970Z  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
2026-09-11T21:19:20.432377Z  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=3075 maximum_identical_destinations=1
2026-09-11T21:19:20.432409Z  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=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.443481Z  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=1294 maximum_identical_destinations=1
2026-09-11T21:19:20.443526Z  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=846 selected_horizon=846 endpoint_lower_bound=256 lower_bound_gap=590 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:20.444377Z  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
2026-09-11T21:19:20.445546Z  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
2026-09-11T21:19:20.445569Z  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
2026-09-11T21:19:20.446717Z  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=396 row_words=33 horizon=7378
2026-09-11T21:19:20.447569Z  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=866 row_words=10 horizon=846
2026-09-11T21:19:20.448253Z  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
2026-09-11T21:19:20.456532Z  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=2181 maximum_identical_destinations=1
2026-09-11T21:19:20.456588Z  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=8679 selected_horizon=8679 endpoint_lower_bound=6912 lower_bound_gap=1767 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:20.459304Z  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=88 row_words=39 horizon=8679
2026-09-11T21:19:20.459850Z  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
2026-09-11T21:19:20.470729Z  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=11656 maximum_identical_destinations=1
2026-09-11T21:19:20.470790Z  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=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.472264Z  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
2026-09-11T21:19:20.473137Z  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=1224 maximum_identical_destinations=1
2026-09-11T21:19:20.473163Z  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=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.476585Z  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=47 row_words=23 horizon=374
2026-09-11T21:19:20.480004Z  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=173 row_words=112 horizon=2940
2026-09-11T21:19:20.481280Z  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
2026-09-11T21:19:20.485669Z  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=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:19:20.485782Z  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=48 initial_horizon=784 selected_horizon=784 endpoint_lower_bound=256 lower_bound_gap=528 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:20.488895Z  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=48 tile=866 row_words=10 horizon=784
2026-09-11T21:19:20.489322Z  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
2026-09-11T21:19:20.491330Z  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
2026-09-11T21:19:20.492167Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:20.492183Z  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=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.494422Z  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=146 row_words=20 horizon=8454
2026-09-11T21:19:20.500654Z  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
2026-09-11T21:19:20.503288Z  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
2026-09-11T21:19:20.503611Z  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
2026-09-11T21:19:20.503844Z  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=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:19:20.503865Z  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=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.504925Z  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
2026-09-11T21:19:20.505428Z  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=49 tile=47 row_words=23 horizon=374
2026-09-11T21:19:20.505537Z  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
2026-09-11T21:19:20.513042Z  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
2026-09-11T21:19:20.520443Z  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
2026-09-11T21:19:20.521502Z  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
2026-09-11T21:19:20.522566Z  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
2026-09-11T21:19:20.527774Z  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
2026-09-11T21:19:20.528592Z  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=1741 maximum_identical_destinations=1
2026-09-11T21:19:20.528625Z  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=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.530568Z  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=14 row_words=49 horizon=5913
2026-09-11T21:19:20.539856Z  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=66
2026-09-11T21:19:20.600402Z  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=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:19:20.600454Z  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=67 initial_horizon=2372 selected_horizon=2372 endpoint_lower_bound=896 lower_bound_gap=1476 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:20.605124Z  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=67 tile=875 row_words=10 horizon=2372
2026-09-11T21:19:20.632498Z  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=68
2026-09-11T21:19:20.633498Z  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=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:19:20.633526Z  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=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.636134Z  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=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:19:20.674083Z  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=69
2026-09-11T21:19:20.676142Z  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=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:19:20.676177Z  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=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.679641Z  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=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:19:20.698933Z  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=70
2026-09-11T21:19:20.699692Z  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=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:19:20.699713Z  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=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.702187Z  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=70 tile=46 row_words=9 horizon=216
2026-09-11T21:19:20.707536Z  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=10001 maximum_identical_destinations=1
2026-09-11T21:19:20.707594Z  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=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:20.720707Z  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=71
2026-09-11T21:19:20.721330Z  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=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:19:20.721356Z  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=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:20.723052Z  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=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:19:20.736892Z  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=127 row_words=165 horizon=16042
2026-09-11T21:19:20.738785Z  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
2026-09-11T21:19:20.741600Z  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=72
2026-09-11T21:19:20.755267Z  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
2026-09-11T21:19:20.755309Z  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
2026-09-11T21:19:20.773605Z  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
2026-09-11T21:19:20.920693Z  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=8694 maximum_identical_destinations=1
2026-09-11T21:19:20.920762Z  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=10603 selected_horizon=10603 endpoint_lower_bound=7872 lower_bound_gap=2731 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:20.930238Z  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=1428 row_words=47 horizon=10603
2026-09-11T21:19:20.933260Z  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
2026-09-11T21:19:20.964921Z  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=50544 maximum_identical_destinations=1
2026-09-11T21:19:20.964961Z  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=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.011149Z  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=473 row_words=173 horizon=11837
2026-09-11T21:19:21.092314Z  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
2026-09-11T21:19:21.122309Z  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=6561 maximum_identical_destinations=1
2026-09-11T21:19:21.122351Z  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=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.135635Z  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=104 row_words=187 horizon=8266
2026-09-11T21:19:21.301765Z  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
2026-09-11T21:19:21.314784Z  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=53 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:19:21.314852Z  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=53 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.324085Z  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=53 tile=90 row_words=107 horizon=2426
2026-09-11T21:19:21.335047Z  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
2026-09-11T21:19:21.337874Z  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
2026-09-11T21:19:21.339266Z  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
2026-09-11T21:19:21.340245Z  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
2026-09-11T21:19:21.354385Z  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=24
2026-09-11T21:19:21.354912Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:21.354934Z  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=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.356863Z  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=22 row_words=23 horizon=2909
2026-09-11T21:19:21.364841Z  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
2026-09-11T21:19:21.376606Z  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=25
2026-09-11T21:19:21.376927Z  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
2026-09-11T21:19:21.377150Z  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=1457 maximum_identical_destinations=1
2026-09-11T21:19:21.377163Z  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=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.379026Z  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=13 row_words=20 horizon=2969
2026-09-11T21:19:21.402612Z  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=45090 maximum_identical_destinations=1
2026-09-11T21:19:21.402649Z  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=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.414954Z  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=8748 maximum_identical_destinations=1
2026-09-11T21:19:21.414997Z  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=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.435612Z  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=137 row_words=278 horizon=7565
2026-09-11T21:19:21.437061Z  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
2026-09-11T21:19:21.442872Z  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=1090 row_words=186 horizon=7433
2026-09-11T21:19:21.449548Z  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
2026-09-11T21:19:21.487404Z  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
2026-09-11T21:19:21.489064Z  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=2013 maximum_identical_destinations=1
2026-09-11T21:19:21.489098Z  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=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.499079Z  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=100 row_words=23 horizon=2561
2026-09-11T21:19:21.522095Z  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
2026-09-11T21:19:21.523438Z  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=2820 maximum_identical_destinations=1
2026-09-11T21:19:21.523465Z  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=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.526976Z  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=1452 row_words=15 horizon=3578
2026-09-11T21:19:21.559332Z  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
2026-09-11T21:19:21.560881Z  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=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:19:21.560927Z  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=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.564736Z  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=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:19:21.581932Z  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
2026-09-11T21:19:21.582521Z  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=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:19:21.582538Z  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=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.584441Z  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=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:19:21.614247Z  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
2026-09-11T21:19:21.627581Z  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
2026-09-11T21:19:21.653087Z  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=42920 maximum_identical_destinations=1
2026-09-11T21:19:21.653127Z  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=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.677541Z  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=297 row_words=174 horizon=1359
2026-09-11T21:19:21.697430Z  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=75
2026-09-11T21:19:21.702551Z  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=76
2026-09-11T21:19:21.708707Z  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=77
2026-09-11T21:19:21.775991Z  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
2026-09-11T21:19:21.819322Z  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
2026-09-11T21:19:21.819370Z  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
2026-09-11T21:19:21.869476Z  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
2026-09-11T21:19:21.903181Z  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
2026-09-11T21:19:21.903977Z  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=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:19:21.903992Z  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=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.906188Z  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=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:19:21.952332Z  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
2026-09-11T21:19:21.967503Z  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=20656 maximum_identical_destinations=1
2026-09-11T21:19:21.967541Z  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=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:21.996909Z  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=535 row_words=106 horizon=4485
2026-09-11T21:19:22.885679Z  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
2026-09-11T21:19:22.908434Z  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
2026-09-11T21:19:22.911142Z  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=51925 maximum_identical_destinations=1
2026-09-11T21:19:22.911189Z  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=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:22.954033Z  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=1095 row_words=135 horizon=822
2026-09-11T21:19:22.971019Z  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=7290 maximum_identical_destinations=1
2026-09-11T21:19:22.971060Z  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=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:22.979037Z  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=74
2026-09-11T21:19:22.980003Z  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=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:19:22.980025Z  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=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:22.981512Z  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=74 tile=47 row_words=25 horizon=406
2026-09-11T21:19:22.994535Z  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=45 row_words=337 horizon=6573
2026-09-11T21:19:23.192725Z  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
2026-09-11T21:19:23.226904Z  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=51948 maximum_identical_destinations=1
2026-09-11T21:19:23.226959Z  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=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:23.233881Z  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=66320 maximum_identical_destinations=1
2026-09-11T21:19:23.233943Z  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=7030 selected_horizon=7030 endpoint_lower_bound=3240 lower_bound_gap=3790 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:23.274765Z  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=356 row_words=177 horizon=850
2026-09-11T21:19:23.275882Z  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=967 row_words=281 horizon=7030
2026-09-11T21:19:23.371425Z  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
2026-09-11T21:19:23.447165Z  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=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:19:23.447237Z  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=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:23.551326Z  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=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:19:23.701302Z  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=71168 maximum_identical_destinations=1
2026-09-11T21:19:23.701365Z  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=13747 selected_horizon=13747 endpoint_lower_bound=8704 lower_bound_gap=5043 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:23.756462Z  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=79 row_words=270 horizon=13747
2026-09-11T21:19:23.893101Z  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
2026-09-11T21:19:23.964780Z  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=52 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:19:23.964851Z  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=52 initial_horizon=12621 selected_horizon=12621 endpoint_lower_bound=7996 lower_bound_gap=4625 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:23.982015Z  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=32720 maximum_identical_destinations=1
2026-09-11T21:19:23.982076Z  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=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:24.049942Z  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=71 row_words=618 horizon=6489
2026-09-11T21:19:24.049990Z  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=52 tile=70 row_words=2132 horizon=12621
2026-09-11T21:19:24.254103Z  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=8
2026-09-11T21:19:24.346100Z  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=6561 maximum_identical_destinations=1
2026-09-11T21:19:24.346176Z  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=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:24.376075Z  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=170 row_words=415 horizon=16505
2026-09-11T21:19:25.057672Z  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=19683 maximum_identical_destinations=1
2026-09-11T21:19:25.057738Z  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=15180 selected_horizon=15180 endpoint_lower_bound=9760 lower_bound_gap=5420 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:25.082768Z  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=480 row_words=538 horizon=15180
2026-09-11T21:19:26.560691Z  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
2026-09-11T21:19:26.646243Z  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=112284 maximum_identical_destinations=1
2026-09-11T21:19:26.646300Z  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=14420 selected_horizon=14420 endpoint_lower_bound=9072 lower_bound_gap=5348 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:26.693908Z  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=195689 maximum_identical_destinations=1
2026-09-11T21:19:26.693958Z  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=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:26.723492Z  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=707 row_words=446 horizon=14420
2026-09-11T21:19:26.929470Z  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=553 row_words=658 horizon=2731
2026-09-11T21:19:27.304478Z  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=18
2026-09-11T21:19:27.362140Z  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=43760 maximum_identical_destinations=1
2026-09-11T21:19:27.362185Z  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=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:27.387017Z  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=96 row_words=112 horizon=2347
2026-09-11T21:19:28.131922Z  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=4374 maximum_identical_destinations=1
2026-09-11T21:19:28.131983Z  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=13739 selected_horizon=13739 endpoint_lower_bound=7872 lower_bound_gap=5867 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:28.143698Z  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=44 row_words=205 horizon=13739
2026-09-11T21:19:31.124726Z  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=127912 maximum_identical_destinations=1
2026-09-11T21:19:31.124804Z  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=11475 selected_horizon=11475 endpoint_lower_bound=6912 lower_bound_gap=4563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:31.355570Z  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=65 row_words=2803 horizon=11475
2026-09-11T21:19:33.875143Z  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=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:19:33.875280Z  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=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:34.152463Z  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=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:19:40.938720Z  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=303406 maximum_identical_destinations=1
2026-09-11T21:19:40.938798Z  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=14502 selected_horizon=14502 endpoint_lower_bound=6016 lower_bound_gap=8486 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:19:41.591056Z  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=225 row_words=1557 horizon=14502
2026-09-11T21:19:45.124537Z  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
2026-09-11T21:19:45.202917Z  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=155252 maximum_identical_destinations=1
2026-09-11T21:19:45.202960Z  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=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:19:45.317321Z  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=231 row_words=310 horizon=2258
2026-09-11T21:19:45.359258Z  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=24994 success=true
2026-09-11T21:19:57.496380Z  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=12137 success=true
2026-09-11T21:19:57.524655Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: costed final placed program final_cycles=15983398 final_exchange=6974407
2026-09-11T21:19:59.012061Z  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=179 success=true
2026-09-11T21:19:59.130357Z  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=118 success=true
2026-09-11T21:19:59.753086Z  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=564 success=true
2026-09-11T21:20:00.233392Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: validated canonical baseline cycles=15983398
2026-09-11T21:20:12.386559Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: screened tile mappings by exchange resource load candidates=271 baseline_cycles=4515560 candidate_cycles=4515560 baseline_pressure=3160342 candidate_pressure=3160342
2026-09-11T21:20:21.139496Z  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=16
2026-09-11T21:20:26.981717Z  INFO local_candidate{attempt=0}: screened exchange table geometry expansion_ms=4572 expansion_and_footprint_ms=5841 estimated_row_bytes=70840 heuristic_row_bytes=147932 geometry_fragments_per_tile=8105 fragment_limit=16384
2026-09-11T21:20:27.134185Z  INFO local_candidate{attempt=0}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:20:27.882441Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:20:27.903256Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:20:27.904315Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:27.904336Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:27.906752Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:20:27.907098Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:20:27.908447Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:20:27.908464Z  INFO local_candidate{attempt=0}: 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
2026-09-11T21:20:27.908734Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:27.908764Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:27.911119Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:20:27.911730Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:20:27.913937Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:27.913967Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:27.916170Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:20:27.925286Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:20:27.925847Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:27.925859Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:27.927325Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:20:27.928160Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:20:27.928684Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:27.928698Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:27.929967Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:20:27.935506Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:20:27.936502Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:20:27.936827Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:20:27.937155Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:20:27.938249Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:20:27.938265Z  INFO local_candidate{attempt=0}: 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
2026-09-11T21:20:27.939811Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:20:27.939832Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:27.940492Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:20:27.942664Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:20:27.945092Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:20:27.950813Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:20:27.951570Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:20:27.951584Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:27.952112Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:20:27.953337Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:20:27.954422Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:20:27.954438Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:20:27.955775Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:20:27.961543Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:20:27.961566Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:27.965037Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:20:27.967454Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:20:27.998229Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:20:27.998263Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:28.000896Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:20:28.006160Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:20:28.014400Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:20:28.020456Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:20:28.021383Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:20:28.021407Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.023451Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:20:28.024530Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:20:28.035554Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:20:28.047617Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:20:28.048535Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:20:28.048558Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.050406Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:20:28.060572Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:20:28.060989Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:20:28.060998Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.062361Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:20:28.072745Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:20:28.073138Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:20:28.073145Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.074155Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:20:28.074401Z  INFO local_candidate{attempt=3}: screened exchange table geometry expansion_ms=5673 expansion_and_footprint_ms=6934 estimated_row_bytes=83448 heuristic_row_bytes=143024 geometry_fragments_per_tile=9413 fragment_limit=16384
2026-09-11T21:20:28.083994Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:20:28.089228Z  INFO local_candidate{attempt=1}: screened exchange table geometry expansion_ms=5898 expansion_and_footprint_ms=6948 estimated_row_bytes=84160 heuristic_row_bytes=145332 geometry_fragments_per_tile=9413 fragment_limit=16384
2026-09-11T21:20:28.203326Z  INFO local_candidate{attempt=1}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:20:28.223032Z  INFO local_candidate{attempt=3}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:20:28.327170Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:20:28.357168Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:20:28.357196Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.375504Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:20:28.389149Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:20:28.389767Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:20:28.389799Z  INFO local_candidate{attempt=0}: 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
2026-09-11T21:20:28.416596Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:20:28.444145Z  INFO local_candidate{attempt=2}: screened exchange table geometry expansion_ms=5912 expansion_and_footprint_ms=7304 estimated_row_bytes=71768 heuristic_row_bytes=147932 geometry_fragments_per_tile=8221 fragment_limit=16384
2026-09-11T21:20:28.596992Z  INFO local_candidate{attempt=2}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:20:28.602604Z  INFO local_candidate{attempt=6}: screened exchange table geometry expansion_ms=6234 expansion_and_footprint_ms=7462 estimated_row_bytes=82792 heuristic_row_bytes=143712 geometry_fragments_per_tile=9370 fragment_limit=16384
2026-09-11T21:20:28.626829Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:20:28.656525Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:28.656555Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.671743Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:20:28.673263Z  INFO local_candidate{attempt=4}: screened exchange table geometry expansion_ms=6270 expansion_and_footprint_ms=7533 estimated_row_bytes=83256 heuristic_row_bytes=144072 geometry_fragments_per_tile=9366 fragment_limit=16384
2026-09-11T21:20:28.700065Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:20:28.701005Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:28.701022Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.703598Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:20:28.760405Z  INFO local_candidate{attempt=5}: screened exchange table geometry expansion_ms=6296 expansion_and_footprint_ms=7619 estimated_row_bytes=83032 heuristic_row_bytes=144676 geometry_fragments_per_tile=9397 fragment_limit=16384
2026-09-11T21:20:28.761077Z  INFO local_candidate{attempt=6}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:20:28.814724Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:20:28.842446Z  INFO local_candidate{attempt=4}: eliminated unread FP8 cast input padding clears removed=1098
2026-09-11T21:20:28.863009Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:20:28.863036Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.880673Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:20:28.925961Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:20:28.927146Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:20:28.927162Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:28.936274Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:20:28.951244Z  INFO local_candidate{attempt=5}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:20:29.307955Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:20:29.320688Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:20:29.320715Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:29.340378Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:20:29.411857Z  INFO local_candidate{attempt=7}: screened exchange table geometry expansion_ms=6888 expansion_and_footprint_ms=8271 estimated_row_bytes=81256 heuristic_row_bytes=143712 geometry_fragments_per_tile=9178 fragment_limit=16384
2026-09-11T21:20:29.504656Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:20:29.533638Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:20:29.533665Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:29.567785Z  INFO local_candidate{attempt=7}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:20:29.571650Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:20:29.574661Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:20:29.616317Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:20:29.616338Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:29.633049Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:20:29.779551Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:20:29.815784Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:29.815829Z  INFO local_candidate{attempt=0}: 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
2026-09-11T21:20:29.833189Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:20:29.833250Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:29.867198Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:20:29.896811Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:20:29.897507Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:29.897525Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:29.899395Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:20:29.914196Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:20:29.930951Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:20:30.034549Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:20:30.049565Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:20:30.049589Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:30.063483Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:20:30.136677Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:20:30.136717Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:30.146037Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:20:30.159183Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:20:30.162332Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:20:30.163732Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:20:30.164778Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:20:30.179588Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:20:30.180220Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:30.180230Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:30.181981Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:20:30.196779Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:20:30.197374Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:30.197384Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:30.198981Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:20:30.237096Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:20:30.237138Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:30.259971Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:20:30.263547Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:20:30.276068Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:20:30.444421Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:20:30.444467Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:30.454429Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:20:30.521353Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:20:30.553884Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:30.553911Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:30.599833Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:20:30.641176Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:20:30.642495Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:20:30.642514Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:30.645726Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:20:30.669186Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:20:30.670085Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:20:30.670098Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:30.672689Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:20:30.694728Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:20:30.695224Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:30.695235Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:30.696618Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:20:30.721496Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:30.721524Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:30.723177Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:20:30.724409Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:20:30.724433Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=13 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:30.725841Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8137
2026-09-11T21:20:30.814569Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:20:30.885472Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:20:30.885505Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:30.988755Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:20:31.045970Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:20:31.046011Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:31.057852Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:20:31.198665Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:20:31.257550Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:20:31.257582Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:31.278182Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:20:31.286985Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:20:31.391250Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:31.391295Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:31.428022Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:20:31.792772Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:20:31.856358Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:20:31.856386Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:31.860497Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:20:31.883261Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:20:31.883293Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:31.889106Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=41 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:20:31.901372Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:20:31.903126Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:20:31.933661Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:31.933691Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:31.946274Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:20:31.947254Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:20:31.975432Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:31.975460Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:31.977481Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:20:31.979812Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:20:31.979846Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:31.983082Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:20:31.983795Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:31.983805Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:31.985513Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:20:32.009499Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:20:32.048066Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:20:32.061417Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:20:32.148415Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:20:32.148465Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=14 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:32.203800Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:20:32.204397Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:20:32.212857Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:20:32.212880Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:20:32.228149Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:20:32.250104Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:20:32.263106Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:20:32.263137Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.283859Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:20:32.284810Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:20:32.309346Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:20:32.309376Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.330720Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:20:32.342453Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:20:32.342481Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.348451Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=14 tile=159 row_words=1160 horizon=8593
2026-09-11T21:20:32.363025Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:20:32.392002Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:20:32.392672Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:32.392685Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.394154Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:20:32.445616Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:20:32.476818Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:20:32.497671Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:20:32.503917Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:20:32.503946Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.523983Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:20:32.596152Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:20:32.600077Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:20:32.619399Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:20:32.619421Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.633379Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:32.633407Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.639447Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:20:32.646969Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:20:32.675508Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:20:32.676439Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:32.676457Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.678596Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:20:32.864296Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:20:32.864331Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:20:32.864363Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:32.886927Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:20:32.886957Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.901838Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:20:32.907913Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:20:32.908169Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:20:32.935319Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:20:32.935351Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.954610Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:20:32.964511Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:20:32.964645Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:20:32.974279Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:20:32.974313Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:20:32.985405Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:20:32.985434Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:32.986699Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:20:32.986725Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:32.987419Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:20:32.987446Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:32.989592Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:20:33.006870Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:20:33.010632Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:20:33.018821Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:20:33.105534Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:20:33.139271Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:20:33.166251Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:20:33.166280Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:33.169878Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:33.169905Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:33.183840Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:20:33.186976Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:20:33.202963Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:20:33.211556Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:20:33.211575Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:20:33.212050Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:20:33.213036Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:33.213058Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:33.215909Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:20:33.220980Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:20:33.226436Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:20:33.241570Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:20:33.250260Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:20:33.250281Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:20:33.252121Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:20:33.252153Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:33.265385Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:20:33.282219Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:20:33.302790Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:20:33.315971Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:20:33.315999Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:20:33.331635Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:20:33.524891Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:20:33.553688Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:20:33.553712Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:33.592163Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:20:33.688988Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:20:33.735630Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:33.735664Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:20:33.750958Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:20:33.763766Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:20:33.763794Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:20:33.786915Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:20:33.787378Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:20:33.804920Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:20:33.809763Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:20:33.809789Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:33.831574Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:20:33.868857Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:20:33.870841Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:20:33.870864Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:20:33.875938Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:20:33.910728Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:20:33.912019Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:20:33.912036Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:20:33.915071Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:20:34.012812Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:20:34.032414Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:20:34.122317Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:20:34.164333Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:20:34.164374Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:34.167100Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:20:34.176176Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:20:34.176196Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:20:34.191037Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:20:34.223547Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:20:34.224801Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:20:34.262026Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:34.262067Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:20:34.308131Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:20:34.349113Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:20:34.350388Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:20:34.350405Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:20:34.354037Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:20:34.380709Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:20:34.381645Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:20:34.381659Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:20:34.383690Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:20:34.446239Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:20:34.459155Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:20:34.505793Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:20:34.531799Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:20:34.543761Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:34.543797Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:20:34.563552Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:34.563581Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:20:34.579615Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:20:34.590045Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:20:34.609286Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:20:34.611219Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:34.611247Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:20:34.640496Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:20:34.641854Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:20:34.641871Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:20:34.645818Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:20:34.649778Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:20:34.651028Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:20:34.651045Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:20:34.654274Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:20:34.657353Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:20:34.667142Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:20:34.668041Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:20:34.668054Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:20:34.670059Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:20:34.674753Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:20:34.675611Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:20:34.675622Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:20:34.677583Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:20:34.681666Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:20:34.681701Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:34.697889Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:20:34.699081Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:20:34.699098Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:20:34.702282Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:20:34.722954Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:20:34.723815Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:20:34.723828Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:20:34.725757Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:20:34.731244Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:20:34.738319Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:20:34.744271Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:20:34.748832Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:20:34.751051Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:20:34.787479Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:20:34.799995Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:20:35.236482Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:20:35.279759Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:35.279797Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:20:35.347259Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:20:35.351602Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:20:35.351634Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:35.389245Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:20:35.409526Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:20:35.411265Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:20:35.411290Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:20:35.416247Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:20:35.450152Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:20:35.451470Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:20:35.451499Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:20:35.454301Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:20:35.454449Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:20:35.485414Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:35.485443Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:20:35.530040Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:20:35.552130Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:20:35.569443Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:20:35.570632Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:20:35.570648Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:20:35.571694Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:20:35.573705Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:20:35.594592Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:20:35.595479Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:20:35.595495Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:20:35.597498Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:20:35.661102Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:20:35.673830Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:20:35.711714Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:20:35.711755Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:35.744618Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:20:35.802173Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:20:35.846788Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:35.846824Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:35.848886Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:20:35.888939Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:20:35.892847Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:20:35.899291Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:20:35.899328Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:35.905252Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=46 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:20:35.916562Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:20:35.916581Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:35.928010Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:35.928035Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:35.930133Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:20:35.938247Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:20:35.945434Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:35.945449Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:35.946666Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:20:35.951342Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:20:35.951365Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:35.956366Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:20:35.970247Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:20:35.970267Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:35.971845Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:20:35.978526Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:35.978548Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:35.980268Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:20:35.990024Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:20:35.990462Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:35.990473Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:35.991577Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:20:35.996745Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:20:36.001361Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:20:36.003129Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:20:36.009861Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:20:36.015901Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:20:36.023977Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:20:36.040146Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:20:36.050937Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:20:36.050953Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:36.053391Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:20:36.057183Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=40 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:20:36.065130Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:20:36.065589Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:20:36.065600Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.066891Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:20:36.076485Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:20:36.077119Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:36.077129Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.078887Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:20:36.082956Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:20:36.083645Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:20:36.083657Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.085322Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:20:36.093811Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:20:36.094133Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:20:36.094138Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.095303Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:20:36.103390Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:36.103417Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:36.103614Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:20:36.103910Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:20:36.103915Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.104867Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:20:36.107921Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:20:36.113143Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:20:36.117370Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:20:36.139745Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:36.139768Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:36.141917Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:20:36.148269Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:36.148300Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:36.150399Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:20:36.154572Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:20:36.155075Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:36.155090Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.156426Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:20:36.163172Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:20:36.177460Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:20:36.178159Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:20:36.178168Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.179843Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:20:36.239718Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:20:36.322424Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:36.322464Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:36.324947Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:20:36.611223Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:20:36.611267Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:36.687184Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:20:36.773008Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:20:36.773052Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.780912Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:20:36.908174Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:20:36.966397Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:20:36.967290Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:36.967308Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:36.970022Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:20:37.019123Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:20:37.070010Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:37.070044Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:37.073569Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:20:37.095618Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:20:37.096407Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:37.096436Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:37.098456Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:20:37.109188Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:20:37.117552Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:20:37.117597Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:37.131605Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:20:37.132684Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:20:37.132703Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:37.135015Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:20:37.170477Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:20:37.704874Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=51 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:20:37.704921Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=51 initial_horizon=9167 selected_horizon=9167 endpoint_lower_bound=7996 lower_bound_gap=1171 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:37.800037Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=51 tile=78 row_words=2149 horizon=9167
2026-09-11T21:20:37.811334Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:20:37.896432Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:37.896469Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:37.915333Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:20:37.920675Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:20:37.987732Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=52 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:20:37.987774Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=52 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:37.992797Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:20:37.994853Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:20:37.994873Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:37.994988Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=52 tile=90 row_words=107 horizon=2426
2026-09-11T21:20:38.000595Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:38.000627Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.006472Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:20:38.024479Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:20:38.031667Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=57 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:20:38.031758Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:20:38.050461Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:38.050487Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.052380Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:20:38.066895Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:38.066917Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.068139Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:20:38.100591Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:20:38.102641Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:20:38.102661Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.104708Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=63 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:20:38.113861Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:20:38.121153Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:38.121232Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.125685Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=65 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:20:38.145091Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:20:38.147324Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:20:38.147351Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.149551Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:20:38.159445Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:20:38.167558Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:20:38.167583Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.168832Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:20:38.195113Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:20:38.195140Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.196983Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:20:38.208945Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:20:38.208973Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.210223Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:20:38.215588Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:20:38.217635Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:20:38.217653Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.228868Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:20:38.244553Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:38.244585Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.268316Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=41 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:20:38.268961Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:20:38.274359Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:20:38.274390Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.275445Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:20:38.295133Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=71 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:20:38.331841Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:38.331880Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.339031Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:20:38.340908Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:20:38.340925Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.352008Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:20:38.352937Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:20:38.395658Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:38.395695Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:38.398874Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:20:38.400942Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:20:38.431029Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:20:38.445975Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:20:38.446008Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.459751Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:20:38.459775Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.485944Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:20:38.496229Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:20:38.504174Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:20:38.514109Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:20:38.514131Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.546069Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:20:38.546918Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:38.546935Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.549955Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:20:38.550264Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:20:38.575317Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:20:38.576128Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:38.576140Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.578435Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:20:38.612814Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:20:38.640876Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:20:38.640900Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.677359Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:20:38.680573Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:20:38.701588Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:20:38.731382Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:20:38.760369Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:20:38.760394Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:38.797526Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:20:38.914106Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:20:38.927383Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:20:38.999176Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:38.999240Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.011085Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:39.011112Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.023678Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:20:39.035738Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:20:39.095547Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:20:39.097392Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:20:39.097411Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.103272Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=52 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:20:39.103309Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=52 initial_horizon=9167 selected_horizon=9167 endpoint_lower_bound=7996 lower_bound_gap=1171 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.105832Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:20:39.107708Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:20:39.107725Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.108840Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:20:39.119138Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:20:39.191345Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=52 tile=78 row_words=2149 horizon=9167
2026-09-11T21:20:39.371880Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:20:39.378249Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=53 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:20:39.378272Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=53 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.385543Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=53 tile=90 row_words=107 horizon=2426
2026-09-11T21:20:39.396671Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:20:39.400213Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:20:39.401835Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:20:39.403085Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:20:39.432342Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:20:39.437002Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:20:39.442772Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:20:39.461069Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=57 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:20:39.476838Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:20:39.480717Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:39.480736Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.483086Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:20:39.494173Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:20:39.497400Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:39.497416Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.498654Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:20:39.504843Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:20:39.504869Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.522665Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:20:39.522691Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.530543Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=63 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:20:39.540941Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:20:39.552861Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=65 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:20:39.554013Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:20:39.559104Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:20:39.575041Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:20:39.575061Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.577592Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:20:39.592648Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:39.592677Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.595461Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:20:39.595476Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.596895Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:20:39.614259Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:20:39.623174Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:20:39.623196Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.625189Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:20:39.636288Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:20:39.636302Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.637732Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:20:39.655636Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:20:39.656938Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:39.656957Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:39.660156Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:20:39.699377Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:20:39.699407Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.700490Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:20:39.720096Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=71 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:20:39.755337Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:20:39.755387Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:39.813222Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:20:39.946150Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:20:39.946193Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:40.036685Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:20:40.082982Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:40.083023Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:40.085158Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:20:40.147949Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=45 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:20:40.171752Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:40.171795Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:40.173917Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:20:40.189852Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:40.189877Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:40.191186Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:20:40.216673Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:20:40.216708Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:40.218150Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:20:40.402848Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:20:40.560811Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:20:40.560854Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:40.629014Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:20:40.875253Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:20:40.915236Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:20:40.915273Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:40.972921Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:20:41.153900Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:20:41.153941Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:20:41.190354Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:20:41.357315Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:20:41.357361Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:41.390872Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=52 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:20:41.390917Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=52 initial_horizon=9167 selected_horizon=9167 endpoint_lower_bound=7996 lower_bound_gap=1171 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:41.430049Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:20:41.515937Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:20:41.515983Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.536693Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=52 tile=78 row_words=2149 horizon=9167
2026-09-11T21:20:41.607334Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:20:41.611955Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:20:41.621603Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:20:41.662159Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:20:41.662840Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:41.662856Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.664819Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:20:41.683960Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:20:41.684721Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:20:41.684742Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.686177Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:20:41.693137Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:20:41.693163Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=13 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:41.693718Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:20:41.694732Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8137
2026-09-11T21:20:41.698456Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:20:41.699032Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:20:41.699060Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.704406Z  INFO local_candidate{attempt=0}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:20:41.729854Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:20:41.782045Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:20:41.788406Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:20:41.788438Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.794899Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:20:41.810900Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:20:41.815312Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:20:41.815345Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.822090Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:20:41.827151Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:20:41.832864Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=53 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:20:41.832891Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=53 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.845461Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=53 tile=90 row_words=107 horizon=2426
2026-09-11T21:20:41.862621Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:20:41.867349Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:20:41.869267Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:20:41.870639Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:20:41.880793Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:20:41.881461Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:41.881474Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.883299Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:20:41.885101Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:20:41.885697Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:20:41.885730Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.916371Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:20:41.916411Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=13 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:41.918888Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=13 tile=53 row_words=38 horizon=6856
2026-09-11T21:20:41.934146Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:41.934175Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:41.937969Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:20:41.949592Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:20:41.959818Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:20:41.960588Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:41.960608Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:41.962856Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:20:41.973569Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:20:41.982045Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:20:41.983471Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:20:41.987047Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:20:41.988945Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=50 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:20:41.988981Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=50 initial_horizon=9167 selected_horizon=9167 endpoint_lower_bound=7996 lower_bound_gap=1171 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:41.997674Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:20:41.998309Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:41.998323Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.000048Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:20:42.001592Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:20:42.003557Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:20:42.016956Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:20:42.017406Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:42.017418Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.018711Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:20:42.019506Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:20:42.032997Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:20:42.033029Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=13 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.034529Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8137
2026-09-11T21:20:42.040964Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:20:42.040985Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=13 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.042138Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8137
2026-09-11T21:20:42.075629Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:20:42.075671Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.076292Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=50 tile=78 row_words=2149 horizon=9167
2026-09-11T21:20:42.079970Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:20:42.105378Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:20:42.106279Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:20:42.106300Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.108609Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:20:42.143974Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:20:42.145560Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:20:42.145584Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.148455Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:20:42.166817Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:20:42.167443Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:20:42.167458Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.169674Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:20:42.187922Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:20:42.188541Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:20:42.188555Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.190400Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:20:42.207029Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:20:42.267630Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=51 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:20:42.267668Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=51 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.275073Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=51 tile=90 row_words=107 horizon=2426
2026-09-11T21:20:42.312619Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=56 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:20:42.332418Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:42.332446Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.334561Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:20:42.350675Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:42.350711Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.352726Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:20:42.388789Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=62 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:20:42.410088Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=64 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:20:42.431812Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:20:42.431841Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.434217Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:20:42.452565Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:20:42.452587Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.453912Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:20:42.480018Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:20:42.480043Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.481864Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:20:42.493311Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:20:42.493327Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.494720Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:20:42.556938Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:20:42.556963Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.558048Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:20:42.578448Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=70 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:20:42.606783Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:20:42.637488Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:20:42.693019Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:20:42.693063Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.693106Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:20:42.724583Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:20:42.724628Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.745700Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:20:42.745756Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.774693Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:20:42.820679Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:20:42.827815Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:20:42.829121Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:20:42.829147Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.839801Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:20:42.858781Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:20:42.871348Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:20:42.872000Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:42.872012Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.873799Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:20:42.895388Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:20:42.895409Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=13 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.897407Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=13 tile=56 row_words=37 horizon=6280
2026-09-11T21:20:42.917654Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:20:42.918647Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:42.918669Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:42.921357Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:20:42.966173Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:20:42.966237Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=13 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:42.967800Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8137
2026-09-11T21:20:43.297801Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:20:43.312834Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:20:43.312866Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:43.337374Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:20:43.669719Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:20:43.669764Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:43.812851Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:20:43.883466Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:43.883511Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:43.886778Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:20:43.967128Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=46 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:20:43.991147Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:43.991182Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:43.993319Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:20:44.009329Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:44.009360Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:44.010652Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:20:44.035285Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:20:44.035324Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:44.036854Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:20:44.271396Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:20:44.336213Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:20:44.336250Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:44.426984Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:20:44.464103Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:20:44.464765Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:44.464778Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:44.466733Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:20:44.496798Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:20:44.531610Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:44.531727Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:44.534978Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:20:44.548149Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:20:44.548675Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:44.548687Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:44.549998Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:20:44.556747Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:20:44.569623Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:20:44.572327Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:20:44.573015Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:20:44.573027Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:44.574628Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:20:44.606805Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:44.606831Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:44.655249Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:20:44.685063Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:20:44.685716Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:44.685730Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:44.687468Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:20:44.703237Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:20:44.703868Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:44.703878Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:44.705646Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:20:44.757240Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:20:44.757278Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:20:44.773916Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:20:44.787634Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:20:44.876275Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:20:44.927846Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:44.927879Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:44.929959Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:20:44.950488Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:20:44.950514Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=12 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:44.952275Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8137
2026-09-11T21:20:45.024746Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:20:45.024786Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:45.162935Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:20:45.162973Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:45.223781Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:20:45.320529Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:20:45.321682Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:20:45.321707Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:45.324008Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:20:45.417856Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=14 transfers=128104 maximum_identical_destinations=1
2026-09-11T21:20:45.417891Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=14 initial_horizon=8667 selected_horizon=8667 endpoint_lower_bound=6912 lower_bound_gap=1755 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:45.419307Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:20:45.419347Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:45.430997Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:20:45.465001Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:20:45.467354Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:20:45.474309Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:20:45.474338Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:45.483709Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:20:45.552765Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:20:45.552793Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:45.554600Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:20:45.619376Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=14 tile=79 row_words=1256 horizon=8667
2026-09-11T21:20:45.689660Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:20:45.689713Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:45.719305Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:20:45.744917Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=51 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:20:45.744961Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=51 initial_horizon=9167 selected_horizon=9167 endpoint_lower_bound=7996 lower_bound_gap=1171 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:45.833964Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=51 tile=78 row_words=2149 horizon=9167
2026-09-11T21:20:45.899361Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:20:45.899410Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:45.908890Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:20:46.026466Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=52 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:20:46.026508Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=52 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:46.034778Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=52 tile=90 row_words=107 horizon=2426
2026-09-11T21:20:46.180018Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=14 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:20:46.180058Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=14 initial_horizon=8490 selected_horizon=8490 endpoint_lower_bound=6600 lower_bound_gap=1890 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:46.244954Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:20:46.245006Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:46.279543Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:20:46.381073Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:20:46.381111Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:46.395659Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=14 tile=75 row_words=2610 horizon=8490
2026-09-11T21:20:46.404315Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:20:46.404354Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:46.414390Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:20:46.603052Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:20:46.660259Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:20:46.660287Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:46.661442Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:20:46.693604Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:46.693628Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:46.694864Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:20:46.707807Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:46.707822Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:46.709222Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:20:47.071241Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:20:47.071280Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:47.081747Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:20:47.094017Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:20:47.097806Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:20:47.102260Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:20:47.702573Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=52 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:20:47.702613Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=52 initial_horizon=9167 selected_horizon=9167 endpoint_lower_bound=7996 lower_bound_gap=1171 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:47.702797Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=14 transfers=127816 maximum_identical_destinations=1
2026-09-11T21:20:47.702837Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=14 initial_horizon=9437 selected_horizon=9437 endpoint_lower_bound=6592 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:47.779643Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=52 tile=78 row_words=2149 horizon=9167
2026-09-11T21:20:47.805501Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=14 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:20:47.805534Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=14 initial_horizon=9882 selected_horizon=9882 endpoint_lower_bound=6912 lower_bound_gap=2970 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:47.906305Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=14 tile=71 row_words=2423 horizon=9437
2026-09-11T21:20:47.966197Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:20:47.974871Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=53 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:20:47.974906Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=53 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:47.975679Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=14 tile=70 row_words=2698 horizon=9882
2026-09-11T21:20:47.986029Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=53 tile=90 row_words=107 horizon=2426
2026-09-11T21:20:47.997301Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:20:48.000299Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:20:48.001566Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:20:48.002504Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:20:48.011882Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:20:48.047406Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:48.047448Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:48.049970Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:20:48.062981Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:20:48.063502Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:48.063515Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:48.064823Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:20:48.071546Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:20:48.077561Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:20:48.079839Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:20:48.088880Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:20:48.090133Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:20:48.100950Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:20:48.135614Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:20:48.135650Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:48.138257Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:20:48.138607Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=15 transfers=33198 maximum_identical_destinations=1
2026-09-11T21:20:48.138634Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=15 initial_horizon=16451 selected_horizon=16451 endpoint_lower_bound=11940 lower_bound_gap=4511 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:48.152874Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:20:48.153495Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:20:48.153508Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:48.154941Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:20:48.177081Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:20:48.178361Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:20:48.178386Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:48.181237Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:20:48.194238Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:20:48.194640Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:20:48.194648Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:48.195966Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:20:48.199470Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=15 tile=78 row_words=593 horizon=16451
2026-09-11T21:20:48.206889Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:20:48.207297Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:20:48.207327Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:48.208430Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:20:48.219243Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:20:48.816001Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:20:48.816038Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:48.842369Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:20:49.012822Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=14 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:20:49.012859Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=14 initial_horizon=9882 selected_horizon=9882 endpoint_lower_bound=6912 lower_bound_gap=2970 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:49.105511Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:20:49.172366Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:20:49.172393Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:49.176007Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=14 tile=70 row_words=2698 horizon=9882
2026-09-11T21:20:49.226327Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:20:49.453509Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=13 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:20:49.453557Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=13 initial_horizon=9882 selected_horizon=9882 endpoint_lower_bound=6912 lower_bound_gap=2970 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:49.613471Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:20:49.613507Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:49.625105Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=20 candidates=6660 ordinary_horizon=7298 paired_horizon=13815 use_paired=false
2026-09-11T21:20:49.699247Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=13 tile=70 row_words=2698 horizon=9882
2026-09-11T21:20:49.706836Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=20 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:20:49.706862Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=20 initial_horizon=7298 selected_horizon=7298 endpoint_lower_bound=4656 lower_bound_gap=2642 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:49.752682Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=20 tile=13 row_words=347 horizon=7298
2026-09-11T21:20:49.913234Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:20:49.940158Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:20:50.003035Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:20:50.003084Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:50.004916Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:20:50.034166Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:20:50.034225Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:50.052364Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:20:50.053079Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:20:50.053094Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:50.054933Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:20:50.093727Z  INFO local_candidate{attempt=0}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:20:50.093785Z  INFO local_candidate{attempt=0}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:50.222018Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:20:50.290374Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:20:50.290424Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:50.298144Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:20:50.299625Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:20:50.299648Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:50.303677Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:20:50.322554Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:20:50.323224Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:20:50.323237Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:50.325040Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:20:50.325670Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:20:50.325705Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:50.325998Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:20:50.349731Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:20:50.349757Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:50.351915Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:20:50.352238Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:20:50.366591Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:20:50.366624Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:50.370914Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:20:50.370930Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:50.372665Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:20:50.400235Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:20:50.418807Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:20:50.469451Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:20:50.478138Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:20:50.478165Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:50.486710Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:20:50.504789Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:20:50.504821Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:50.582150Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:20:50.639438Z  INFO local_candidate{attempt=0}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:20:50.755574Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:20:50.761687Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:20:50.768884Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:20:50.966969Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:20:50.967013Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:50.992292Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:20:51.024415Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:20:51.093321Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:20:51.093366Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:51.108169Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:20:51.108223Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=29 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:51.116660Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=14502
2026-09-11T21:20:51.150744Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:20:51.247846Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:20:51.247878Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:51.281497Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:20:51.540271Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:20:51.570947Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:20:51.590739Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:20:51.590772Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:51.616519Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:20:51.642180Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:20:51.642239Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:51.685012Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:20:51.687221Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:20:51.687240Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:51.698593Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:20:51.702372Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:20:51.735389Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=14 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:20:51.735437Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=14 initial_horizon=9882 selected_horizon=9882 endpoint_lower_bound=6912 lower_bound_gap=2970 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:51.986150Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=14 tile=70 row_words=2698 horizon=9882
2026-09-11T21:20:52.002369Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:52.002414Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:52.060917Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:20:52.207520Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:20:52.229682Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:20:52.229713Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:52.268109Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:20:52.389727Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:20:52.389765Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:52.426816Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:20:52.697571Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:20:52.697604Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:52.706445Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=14 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:20:52.706485Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=14 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:52.734895Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:20:52.774673Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=14 tile=71 row_words=618 horizon=6489
2026-09-11T21:20:52.913843Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:20:52.913879Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:52.946812Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:20:53.206492Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:20:53.206533Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:53.244544Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:20:53.316253Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:20:53.340390Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:20:53.340416Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:53.361985Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:20:53.431947Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:20:53.437046Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:20:53.437067Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:53.441733Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:20:53.547086Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:20:53.547127Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:53.585574Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:20:53.831333Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:20:53.831370Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:53.866448Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:20:53.884007Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:20:53.884044Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:54.008080Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:20:54.067107Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:54.067140Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.076515Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:20:54.090834Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:20:54.114373Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:20:54.114395Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.126807Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:20:54.126839Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.135944Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:20:54.140282Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:20:54.145021Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:20:54.152806Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:20:54.185337Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:20:54.186303Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:54.186321Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.187867Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:20:54.188934Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:20:54.188949Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.189018Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:20:54.196019Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:20:54.203797Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:20:54.208931Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:20:54.208949Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.213471Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:20:54.234284Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:20:54.235316Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:20:54.235336Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.237431Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:20:54.259557Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:20:54.260554Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:54.260572Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.263440Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:20:54.286277Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:20:54.286314Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:54.317121Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=25 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:20:54.317156Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=25 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:54.322952Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=25 tile=723 row_words=30 horizon=2545
2026-09-11T21:20:54.332827Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:20:54.348170Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:20:54.366223Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:20:54.476810Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=19 candidates=8748 ordinary_horizon=7565 paired_horizon=11978 use_paired=false
2026-09-11T21:20:54.496135Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:20:54.508485Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:20:54.508508Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.525501Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:20:54.558765Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:20:54.558802Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:54.582733Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:20:54.649002Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:20:54.649038Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:54.658572Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:20:54.712516Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:20:54.712552Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:54.751707Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:20:54.797801Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:20:54.797830Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:54.811907Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:20:54.817906Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:20:54.855312Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:20:54.855333Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.869282Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:20:54.870999Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:20:54.914436Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:20:54.915379Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:20:54.915395Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.921863Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:20:54.946039Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:20:54.946066Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.949613Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:20:54.973687Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:20:54.973708Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:54.985790Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:20:54.998237Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:20:55.010442Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:20:55.011184Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:55.011194Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.013110Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:20:55.026055Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:20:55.049464Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:55.049488Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.051215Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:20:55.061112Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:20:55.061513Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:55.061529Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.062518Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:20:55.067597Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:20:55.072094Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:20:55.073776Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:20:55.080692Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:20:55.081662Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:20:55.089977Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:20:55.115860Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:20:55.115886Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.117833Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:20:55.128710Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:20:55.129118Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:20:55.129130Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.130282Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:20:55.145165Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:20:55.145771Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:20:55.145784Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.147276Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:20:55.155036Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:20:55.155341Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:20:55.155348Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.156387Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:20:55.164131Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:20:55.164413Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:20:55.164421Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.165197Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:20:55.169543Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:20:55.169571Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.172630Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:20:55.189888Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:20:55.189912Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.195336Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:20:55.201895Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:20:55.206121Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:20:55.206474Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:20:55.206491Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.218989Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:20:55.219022Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.222102Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:20:55.244697Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:20:55.255461Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:20:55.267690Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:20:55.267712Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.288263Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:20:55.318716Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:20:55.318744Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.320415Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:20:55.330509Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:20:55.330913Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:20:55.330922Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.331949Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:20:55.337005Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:20:55.347164Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:20:55.347666Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:20:55.347676Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.348918Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:20:55.380295Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:20:55.380330Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.387712Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:20:55.460470Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:20:55.490625Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:55.490648Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.525341Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:20:55.528525Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:20:55.528559Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.546993Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:20:55.547439Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:55.547447Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.548826Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:20:55.560528Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:20:55.560928Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:55.560936Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.562344Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:20:55.564834Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:20:55.606071Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:20:55.618918Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:20:55.619563Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:20:55.646397Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:20:55.646422Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.676862Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:20:55.691769Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:20:55.691800Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.746128Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:20:55.768363Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:20:55.768386Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:55.788669Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:20:55.934010Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=53 transfers=12014 maximum_identical_destinations=1
2026-09-11T21:20:55.934042Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=53 initial_horizon=7189 selected_horizon=7189 endpoint_lower_bound=6756 lower_bound_gap=433 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:55.940090Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=53 tile=79 row_words=125 horizon=7189
2026-09-11T21:20:55.948783Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:20:55.950833Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:20:55.951722Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:20:55.952356Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:20:56.002676Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:20:56.002718Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.047291Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:20:56.051617Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:20:56.070732Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:20:56.070754Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:56.073156Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:20:56.091276Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:20:56.093889Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:20:56.101392Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:56.101410Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:56.113602Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:20:56.113639Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.117701Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:20:56.117729Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.126248Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:20:56.136150Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:20:56.144141Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:20:56.144677Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:56.144687Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:56.146115Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:20:56.149929Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:20:56.157799Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:20:56.158259Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:56.158268Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:56.159557Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:20:56.164361Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:20:56.164383Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.167002Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:20:56.170694Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:20:56.171081Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:56.171090Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:56.172373Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:20:56.180604Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:20:56.215167Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:20:56.224612Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:20:56.309931Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:20:56.309961Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.316498Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:20:56.378347Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:56.378382Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.413487Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:20:56.445007Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:56.445031Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.446605Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:20:56.460244Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:56.460260Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.461636Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:20:56.634151Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:20:56.636442Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:20:56.636471Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.656962Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:20:56.659238Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:20:56.659265Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:56.679140Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:20:56.705677Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=52 transfers=69127 maximum_identical_destinations=1
2026-09-11T21:20:56.705709Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=52 initial_horizon=5642 selected_horizon=5642 endpoint_lower_bound=4464 lower_bound_gap=1178 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.721479Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:20:56.721509Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.729785Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:20:56.739858Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:20:56.739881Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.744305Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:20:56.758790Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:20:56.758811Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.761478Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:20:56.768315Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=52 tile=164 row_words=914 horizon=5642
2026-09-11T21:20:56.779664Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:20:56.779679Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=32 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.781451Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=5448
2026-09-11T21:20:56.800938Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:20:56.801902Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:20:56.801918Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:56.803793Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:20:56.803815Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.804163Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:20:56.812150Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:20:56.820286Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:20:56.820886Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:20:56.820901Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:56.822667Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:20:56.929984Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:20:56.930020Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.950195Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:20:56.950250Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=19 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.954021Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:20:56.954047Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:56.955947Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=19 tile=21 row_words=157 horizon=2904
2026-09-11T21:20:56.971593Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:20:57.056122Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:20:57.056145Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:57.063382Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:20:57.122694Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:20:57.122731Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:57.129670Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:20:57.241728Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:20:57.292518Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:20:57.292542Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:57.294698Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:20:57.357267Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:20:57.364235Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:20:57.365668Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:20:57.365689Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:57.368645Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:20:57.387390Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:20:57.388324Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:20:57.388341Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:57.391666Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:20:57.568761Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:20:57.605946Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:20:57.605985Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:57.621117Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:20:57.663257Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:20:57.664881Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:20:57.664902Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:57.671770Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:20:57.719529Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:20:57.719574Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:57.750556Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:20:57.790029Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:57.790061Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:57.792229Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:20:57.934520Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:20:57.959581Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:20:57.960700Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:20:57.960727Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:57.970781Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:20:57.970803Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:57.986650Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:20:57.990770Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:20:58.004365Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:20:58.004397Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:58.013978Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:20:58.014451Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:58.014459Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:58.015917Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:20:58.200486Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:20:58.221592Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:20:58.221627Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:58.251082Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:20:58.274162Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:20:58.274616Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:58.274626Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:58.275864Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:20:58.284756Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:20:58.284785Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:58.367698Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:20:58.627178Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:20:58.627233Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:58.644097Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:20:58.776557Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:20:58.776585Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:58.783786Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:20:58.866561Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:20:58.866597Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=35 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:58.873172Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:20:58.900330Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:20:58.900353Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:58.935438Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:20:58.946033Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14348
2026-09-11T21:20:58.957537Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:20:58.957983Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:58.957991Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:58.959304Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:20:58.970975Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:20:58.971398Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:58.971407Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:58.972637Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:20:58.993278Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:20:59.009694Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:20:59.015953Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:20:59.025590Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:20:59.036777Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:20:59.036799Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:59.067501Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:20:59.083041Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:20:59.083070Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:59.106581Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:20:59.106623Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:59.110674Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:20:59.130875Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:20:59.130898Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:59.132904Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:20:59.247135Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:20:59.550493Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:20:59.550529Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:59.559186Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:20:59.570017Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:20:59.573691Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:20:59.578120Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:20:59.675926Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:20:59.675961Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:59.700534Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:20:59.714830Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:20:59.714872Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:59.736913Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:20:59.760395Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:20:59.760432Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:59.762508Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:20:59.762999Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:20:59.763010Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:20:59.764294Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:20:59.784035Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:20:59.800242Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:20:59.800273Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:59.830339Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=36 tile=1095 row_words=136 horizon=822
2026-09-11T21:20:59.857442Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:20:59.857467Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:20:59.858923Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:00.055249Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:00.089920Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:00.089950Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:00.148535Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:00.148564Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:00.184465Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:21:00.318510Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:00.364469Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:00.364500Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:00.366103Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:00.412161Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:00.412269Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:00.447194Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:00.473918Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:00.474496Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:00.474507Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:00.475879Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:01.307127Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:01.331771Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:01.331812Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:01.358154Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:01.364432Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:01.387251Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:01.387276Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:01.388023Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:01.388556Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:01.388567Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:01.389912Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:01.414563Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:01.415635Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:01.415650Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:01.418007Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:01.418725Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:01.424888Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:01.424917Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:01.436307Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:21:01.437004Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:01.437014Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:01.438931Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:21:01.511824Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:21:01.786379Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:01.786414Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:01.874930Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:21:02.362152Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:02.362190Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:02.388236Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:21:02.843115Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:02.930198Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:02.930238Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:03.093029Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:03.363104Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:03.363142Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:03.545459Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:03.728487Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:03.728525Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:03.783814Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:03.783849Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:03.816365Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:21:03.866630Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:21:04.268660Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:04.268691Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:04.637929Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:04.637960Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:04.702736Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:21:04.827326Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:04.827358Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:04.832585Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:05.247165Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:21:07.151745Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:07.151779Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:07.558846Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:21:09.597687Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:09.597722Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:09.924614Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:21:10.053039Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=56 success=true
2026-09-11T21:21:10.057950Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-11T21:21:10.067652Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:21:10.243885Z  INFO local_candidate{attempt=1}: exchange table and repeat patch storage exchange_table_bytes=50776 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:21:10.711868Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:10.711901Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:11.035479Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:21:11.136008Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=40 success=true
2026-09-11T21:21:11.140361Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-11T21:21:11.146940Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:21:11.152192Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=44 success=true
2026-09-11T21:21:11.155888Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:21:11.162562Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:21:11.303852Z  INFO local_candidate{attempt=6}: exchange table and repeat patch storage exchange_table_bytes=49704 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:21:11.314103Z  INFO local_candidate{attempt=7}: exchange table and repeat patch storage exchange_table_bytes=48968 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:21:11.814551Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=119 success=true
2026-09-11T21:21:11.814583Z  INFO local_candidate{attempt=1}: placing generated tile programs linked_end=385664 host_code_base=385664 host_code_bytes=9084 generated_code_bytes=16412 exchange_table_bytes=50776 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (382676, 382680), (384692, 384696), (394816, 524288)]
2026-09-11T21:21:11.814598Z  INFO local_candidate{attempt=1}: allocated package support memory linked_end=385664 profile_bytes=1064 exchange_table_bytes=50776 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=16412 code_address=394816 available_ranges=[(327680, 360448), (368488, 376832), (491520, 524288), (525352, 949168)]
2026-09-11T21:21:12.299371Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=484 success=true
2026-09-11T21:21:12.310998Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:21:12.313760Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:21:12.313861Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:21:12.314371Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:21:12.314386Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.315584Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:21:12.319866Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:21:12.320736Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:21:12.320747Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:21:12.320926Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:12.321866Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:12.321884Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.322577Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:21:12.324599Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:12.324618Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:21:12.325752Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:21:12.325769Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:21:12.327839Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:12.327866Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=784 selected_horizon=784 endpoint_lower_bound=256 lower_bound_gap=528 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:12.328594Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:21:12.329699Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=784
2026-09-11T21:21:12.331392Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:21:12.331981Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:21:12.331991Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.332266Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:21:12.333304Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:21:12.340043Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:21:12.340369Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:21:12.340479Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:12.340489Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.341236Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:21:12.341422Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:21:12.341601Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:21:12.341607Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.341748Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:21:12.342644Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:21:12.343298Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:12.343316Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=256 lower_bound_gap=590 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:12.345657Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=846
2026-09-11T21:21:12.347758Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:21:12.348894Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:21:12.350907Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:21:12.351222Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:21:12.351228Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.352067Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:21:12.357976Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:21:12.358495Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:12.358506Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.358836Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:21:12.359365Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:21:12.359376Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.359741Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:21:12.359768Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:21:12.360756Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:21:12.366890Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:21:12.372020Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:21:12.372037Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=2372 selected_horizon=2372 endpoint_lower_bound=896 lower_bound_gap=1476 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:12.373489Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:21:12.374054Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=2372
2026-09-11T21:21:12.375385Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:21:12.376640Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:21:12.377436Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:21:12.384357Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:21:12.385141Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:21:12.388678Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:21:12.392872Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:21:12.402843Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:21:12.403704Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:12.403721Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.404264Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:21:12.404699Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:12.404706Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.405777Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:21:12.406283Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:21:12.408449Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:21:12.425556Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:21:12.429776Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:21:12.429800Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=8679 selected_horizon=8679 endpoint_lower_bound=6912 lower_bound_gap=1767 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:12.431324Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=88 row_words=39 horizon=8679
2026-09-11T21:21:12.442673Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:21:12.446688Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:21:12.447059Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:12.447065Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.447546Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:21:12.447559Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.448237Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:21:12.452746Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=90 row_words=107 horizon=2426
2026-09-11T21:21:12.458690Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:21:12.459052Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:12.459057Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.460325Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:21:12.464882Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:21:12.465273Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:21:12.465281Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.466284Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:21:12.499858Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:21:12.508387Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:21:12.576294Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:21:12.576331Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:12.592770Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:21:12.639628Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:21:12.664587Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:21:12.664611Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:21:12.692317Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:21:12.715084Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:21:12.715113Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=10603 selected_horizon=10603 endpoint_lower_bound=7872 lower_bound_gap=2731 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:12.721374Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:12.721406Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:12.721892Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=10603
2026-09-11T21:21:12.855475Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:21:12.862293Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:21:12.873909Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:21:12.873932Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.878885Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:12.878911Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:12.890970Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:21:12.893782Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:21:12.973936Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:21:12.995965Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:21:12.995994Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.003236Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:21:13.003624Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:21:13.003647Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=13739 selected_horizon=13739 endpoint_lower_bound=7872 lower_bound_gap=5867 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:13.012611Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=44 row_words=205 horizon=13739
2026-09-11T21:21:13.028599Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:21:13.044151Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:21:13.044174Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.061362Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:21:13.100588Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:21:13.101544Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:21:13.101558Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.108353Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:21:13.151723Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:21:13.207431Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:21:13.217872Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:21:13.217896Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:21:13.235217Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:21:13.271528Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:13.272802Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:13.272820Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.276168Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:13.299652Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:13.300589Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:13.300602Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.303148Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:21:13.543118Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:21:13.569960Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:13.569981Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.604997Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:21:13.699075Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:13.699574Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:13.699596Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.700665Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:13.713003Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:21:13.713366Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:13.713376Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.714465Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:21:13.732422Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:21:13.827101Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:21:13.867597Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:21:13.867624Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.882239Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:21:13.893955Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:21:13.905987Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:21:13.906011Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:13.910950Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:21:13.971453Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:21:14.002570Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:14.002601Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:21:14.037999Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:21:14.223227Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:21:14.237521Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:21:14.237546Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:14.254412Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:21:14.271461Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:21:14.301633Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:21:14.301668Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:14.315396Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:21:14.357775Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:21:14.375223Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:14.375244Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:14.400514Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:14.412997Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:21:14.473448Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:21:14.473478Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:14.510252Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:21:14.510284Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=13747 selected_horizon=13747 endpoint_lower_bound=8704 lower_bound_gap=5043 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:14.524047Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=71 row_words=618 horizon=6489
2026-09-11T21:21:14.549693Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=270 horizon=13747
2026-09-11T21:21:14.612011Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:21:14.635908Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:21:14.682792Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:21:14.682820Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:14.745798Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:21:15.235370Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:21:15.357106Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:21:15.357148Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:21:15.449257Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:21:15.588813Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:15.588852Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=15180 selected_horizon=15180 endpoint_lower_bound=9760 lower_bound_gap=5420 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:15.616368Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=538 horizon=15180
2026-09-11T21:21:15.966749Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:21:15.966784Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7030 selected_horizon=7030 endpoint_lower_bound=3240 lower_bound_gap=3790 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:15.996305Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=281 horizon=7030
2026-09-11T21:21:16.106906Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:21:16.191285Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:16.191319Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:16.342594Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:16.781432Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:16.781468Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14420 selected_horizon=14420 endpoint_lower_bound=9072 lower_bound_gap=5348 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:16.862095Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=707 row_words=446 horizon=14420
2026-09-11T21:21:18.901330Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:21:18.901372Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=11475 selected_horizon=11475 endpoint_lower_bound=6912 lower_bound_gap=4563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:19.068317Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=65 row_words=2803 horizon=11475
2026-09-11T21:21:20.960805Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:20.960841Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:21.151837Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:21.412891Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:21:21.479908Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:21:21.479949Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=12621 selected_horizon=12621 endpoint_lower_bound=7996 lower_bound_gap=4625 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:21.538553Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=70 row_words=2132 horizon=12621
2026-09-11T21:21:21.543821Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:21:21.543850Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:21.602830Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:21:24.996398Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:24.996441Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=6016 lower_bound_gap=8486 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:25.418620Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=225 row_words=1557 horizon=14502
2026-09-11T21:21:25.504075Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=12616 success=true
2026-09-11T21:21:25.504161Z  INFO local_candidate{attempt=7}: placing generated tile programs linked_end=385664 host_code_base=385664 host_code_bytes=9092 generated_code_bytes=16464 exchange_table_bytes=48968 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (382676, 382680), (384692, 384696), (394824, 524288)]
2026-09-11T21:21:25.504289Z  INFO local_candidate{attempt=7}: allocated package support memory linked_end=385664 profile_bytes=1072 exchange_table_bytes=48968 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16464 code_address=394824 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525360, 949168)]
2026-09-11T21:21:25.505667Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=12697 success=true
2026-09-11T21:21:25.505726Z  INFO local_candidate{attempt=6}: placing generated tile programs linked_end=385664 host_code_base=385664 host_code_bytes=9092 generated_code_bytes=16400 exchange_table_bytes=49704 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (382676, 382680), (384692, 384696), (394824, 524288)]
2026-09-11T21:21:25.505800Z  INFO local_candidate{attempt=6}: allocated package support memory linked_end=385664 profile_bytes=1068 exchange_table_bytes=49704 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16400 code_address=394824 available_ranges=[(327680, 360448), (368488, 376832), (491520, 524288), (525356, 949168)]
2026-09-11T21:21:25.518301Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=13218 success=true
2026-09-11T21:21:25.557253Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=46 success=true
2026-09-11T21:21:25.561826Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-11T21:21:25.571654Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:21:25.579704Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=59 success=true
2026-09-11T21:21:25.585085Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=5 success=true
2026-09-11T21:21:25.585183Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=66 success=true
2026-09-11T21:21:25.589950Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-11T21:21:25.592556Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=70 success=true
2026-09-11T21:21:25.596059Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:21:25.597832Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:21:25.598174Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:21:25.604061Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:21:25.606607Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=94 success=true
2026-09-11T21:21:25.611903Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=5 success=true
2026-09-11T21:21:25.622276Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:21:25.756359Z  INFO local_candidate{attempt=4}: exchange table and repeat patch storage exchange_table_bytes=50304 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:21:25.761756Z  INFO local_candidate{attempt=5}: exchange table and repeat patch storage exchange_table_bytes=49952 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:21:25.768321Z  INFO local_candidate{attempt=2}: exchange table and repeat patch storage exchange_table_bytes=39832 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:21:25.781589Z  INFO local_candidate{attempt=3}: exchange table and repeat patch storage exchange_table_bytes=50264 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:21:25.862821Z  INFO local_candidate{attempt=0}: exchange table and repeat patch storage exchange_table_bytes=39136 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:21:26.126143Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=621 success=true
2026-09-11T21:21:26.126864Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=621 success=true
2026-09-11T21:21:26.130809Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:21:26.145068Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:21:26.145755Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:21:26.146881Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:21:26.147011Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:21:26.147931Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:26.147950Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.150079Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:21:26.150354Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:21:26.150721Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:21:26.151094Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:26.151103Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.151486Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:21:26.151505Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.153657Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:26.153927Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:21:26.159629Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:21:26.167648Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:21:26.168359Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:26.168394Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.170167Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:21:26.172301Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:21:26.173317Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:26.173332Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.174470Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:21:26.176379Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:21:26.176392Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.177277Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:21:26.179231Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:21:26.181912Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:21:26.182704Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:21:26.182719Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.183673Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:21:26.185324Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:21:26.185340Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.185738Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:21:26.185967Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:21:26.188143Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:21:26.196535Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:21:26.197386Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:21:26.197403Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.198134Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:21:26.198980Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:26.198996Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.199174Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:21:26.201251Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:21:26.203037Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:21:26.203646Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:21:26.203658Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.205711Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:21:26.211824Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:21:26.220700Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:21:26.221070Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:21:26.221298Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:21:26.221311Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.222821Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:21:26.231356Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:21:26.236477Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:21:26.237794Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:21:26.240745Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:21:26.240763Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.249004Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:21:26.254426Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:21:26.256346Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:21:26.258900Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:21:26.259773Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:26.259789Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.262364Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:26.287594Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:26.287619Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=256 lower_bound_gap=590 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:26.289921Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=846
2026-09-11T21:21:26.303184Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:21:26.303700Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:26.303711Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.305051Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:21:26.312218Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:21:26.318958Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:21:26.321410Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:21:26.331114Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:21:26.332394Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:21:26.342499Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:21:26.349519Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:21:26.366218Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:21:26.366433Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:21:26.371153Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:21:26.371172Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.373593Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:21:26.373610Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=2372 selected_horizon=2372 endpoint_lower_bound=896 lower_bound_gap=1476 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:26.375319Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=2372
2026-09-11T21:21:26.377110Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=90 row_words=107 horizon=2426
2026-09-11T21:21:26.385390Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:21:26.385548Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:21:26.385798Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:21:26.385805Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.386836Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:21:26.387903Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:21:26.388865Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:21:26.389546Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:21:26.400968Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:21:26.401566Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:21:26.401575Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.402935Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:21:26.410132Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:21:26.410430Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:21:26.410437Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.411427Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:21:26.418914Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:21:26.419184Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:21:26.419189Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.419978Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:21:26.426984Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:21:26.472252Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:21:26.498983Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:21:26.499004Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.531735Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:21:26.549113Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:21:26.549145Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:26.567342Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:21:26.679642Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:21:26.702941Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:26.702963Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.703511Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:21:26.703540Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:26.710610Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:21:26.715118Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:21:26.739662Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:21:26.740460Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:21:26.740470Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:26.740508Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.742339Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:21:26.763723Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:26.763748Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.775989Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:21:26.797682Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:21:26.798353Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:26.798364Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:26.799966Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:21:27.304284Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:21:27.338857Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:21:27.358095Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:21:27.358122Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:27.364753Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:21:27.364777Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:27.384631Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:21:27.396485Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:21:27.411181Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:21:27.435174Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:21:27.435216Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:27.447262Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:21:27.449111Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:21:27.449129Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:27.459651Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:21:27.467459Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:21:27.668028Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:21:27.710425Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:21:27.710453Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:27.725931Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:21:27.952947Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:21:27.968234Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:21:27.968259Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:27.996331Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:21:28.130298Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:21:28.147413Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:21:28.147453Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:28.166057Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:21:28.375295Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:21:28.382454Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:21:28.382474Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:21:28.393679Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:21:28.516900Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:21:28.575492Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:21:28.575533Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:28.592394Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1223 success=true
2026-09-11T21:21:28.592434Z  INFO local_candidate{attempt=2}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16560 exchange_table_bytes=39832 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:21:28.592454Z  INFO local_candidate{attempt=2}: allocated package support memory linked_end=386240 profile_bytes=1080 exchange_table_bytes=39832 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16560 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525368, 949168)]
2026-09-11T21:21:28.597096Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1206 success=true
2026-09-11T21:21:28.597131Z  INFO local_candidate{attempt=4}: placing generated tile programs linked_end=385664 host_code_base=385664 host_code_bytes=9092 generated_code_bytes=16412 exchange_table_bytes=50304 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (382676, 382680), (384692, 384696), (394824, 524288)]
2026-09-11T21:21:28.597145Z  INFO local_candidate{attempt=4}: allocated package support memory linked_end=385664 profile_bytes=1064 exchange_table_bytes=50304 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16412 code_address=394824 available_ranges=[(327680, 360448), (368488, 376832), (491520, 524288), (525352, 949168)]
2026-09-11T21:21:28.598444Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:21:28.604818Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1167 success=true
2026-09-11T21:21:28.604850Z  INFO local_candidate{attempt=3}: placing generated tile programs linked_end=385664 host_code_base=385664 host_code_bytes=9092 generated_code_bytes=15200 exchange_table_bytes=50264 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (382676, 382680), (384692, 384696), (394824, 524288)]
2026-09-11T21:21:28.604863Z  INFO local_candidate{attempt=3}: allocated package support memory linked_end=385664 profile_bytes=1068 exchange_table_bytes=50264 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=15200 code_address=394824 available_ranges=[(327680, 360448), (368488, 376832), (491520, 524288), (525356, 949168)]
2026-09-11T21:21:28.656532Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1162 success=true
2026-09-11T21:21:28.656576Z  INFO local_candidate{attempt=5}: placing generated tile programs linked_end=385664 host_code_base=385664 host_code_bytes=9092 generated_code_bytes=16288 exchange_table_bytes=49952 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (382676, 382680), (384692, 384696), (394824, 524288)]
2026-09-11T21:21:28.656590Z  INFO local_candidate{attempt=5}: allocated package support memory linked_end=385664 profile_bytes=1056 exchange_table_bytes=49952 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16288 code_address=394824 available_ranges=[(327680, 360448), (368488, 376832), (491520, 524288), (525344, 949168)]
2026-09-11T21:21:28.788057Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1276 success=true
2026-09-11T21:21:28.788094Z  INFO local_candidate{attempt=0}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16560 exchange_table_bytes=39136 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:21:28.788111Z  INFO local_candidate{attempt=0}: allocated package support memory linked_end=386240 profile_bytes=1080 exchange_table_bytes=39136 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16560 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525368, 949168)]
2026-09-11T21:21:28.917828Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:21:28.983864Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=127816 maximum_identical_destinations=1
2026-09-11T21:21:28.983892Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=9437 selected_horizon=9437 endpoint_lower_bound=6592 lower_bound_gap=2845 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.002463Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:21:29.043762Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:21:29.062464Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:21:29.062504Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.077612Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:21:29.106705Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=71 row_words=2423 horizon=9437
2026-09-11T21:21:29.107548Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:21:29.107572Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.116680Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:21:29.176448Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:21:29.176475Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.184934Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:21:29.215807Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:29.215833Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.244392Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:21:29.245601Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:21:29.254413Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:21:29.254670Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:21:29.265517Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:21:29.273953Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:29.273976Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:21:29.276573Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:21:29.277111Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:29.277120Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.278690Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:21:29.279068Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:21:29.279608Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:29.279619Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.280929Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:21:29.292291Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:21:29.292724Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:29.292731Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.294130Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:21:29.300292Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:21:29.308595Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:21:29.310063Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:21:29.310831Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:29.310846Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.312981Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:21:29.324194Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:21:29.324232Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.336097Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:21:29.337102Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:21:29.337117Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.338058Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:21:29.338241Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:21:29.338914Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:21:29.338927Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:21:29.339615Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=56 row_words=37 horizon=6280
2026-09-11T21:21:29.341288Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:21:29.348398Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:21:29.356024Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:21:29.356638Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:21:29.356648Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:21:29.358172Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:21:29.395030Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:21:29.401543Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:21:29.410416Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:21:29.418298Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:21:29.424333Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:29.425278Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:29.425293Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.427701Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:29.429231Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:21:29.429255Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:21:29.436452Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:21:29.436989Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:29.437000Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.438528Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:21:29.444627Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:21:29.445279Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:29.445296Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.446582Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:21:29.447098Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:21:29.460492Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:21:29.479111Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:21:29.480288Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:21:29.480304Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:21:29.482816Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:21:29.486109Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:29.486129Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=784 selected_horizon=784 endpoint_lower_bound=256 lower_bound_gap=528 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:29.488080Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=784
2026-09-11T21:21:29.498081Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:21:29.498500Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:29.498510Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.499639Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:21:29.500045Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:21:29.500691Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:21:29.500702Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:21:29.502384Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:21:29.504910Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:21:29.515086Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:21:29.515601Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:21:29.515612Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.516779Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:21:29.541798Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:21:29.548689Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=943 success=true
2026-09-11T21:21:29.550427Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:21:29.651788Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:21:29.658005Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:21:29.658031Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:29.663982Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=90 row_words=107 horizon=2426
2026-09-11T21:21:29.673015Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:21:29.675570Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:21:29.676639Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:21:29.677426Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:21:29.771443Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1174 success=true
2026-09-11T21:21:29.890157Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:21:29.890217Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:29.899405Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=139 row_words=185 horizon=10717
2026-09-11T21:21:30.436261Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:30.465881Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:30.465907Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:30.497357Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:30.520164Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:30.520649Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:30.520659Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:30.522004Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:30.533125Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:21:30.533560Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:30.533569Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:30.534900Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:30.594375Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:21:30.609614Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:21:30.638664Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:30.704888Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:21:30.742031Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:30.742079Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:21:30.751402Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:30.751442Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:30.791083Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:21:30.813463Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:21:30.818892Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:21:30.825570Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:21:30.832629Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:21:30.837818Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:21:30.844289Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:21:30.901251Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:21:30.918355Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:30.929386Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:21:30.979776Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:30.979810Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:30.985381Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:21:31.008215Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:31.008295Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.009363Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:21:31.023973Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:21:31.034610Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:31.034646Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.052693Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:21:31.053606Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:31.053623Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.055963Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:21:31.061737Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:21:31.085898Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:31.085925Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=256 lower_bound_gap=590 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:31.087805Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=846
2026-09-11T21:21:31.091591Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:21:31.098436Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:21:31.098900Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:31.098909Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.100015Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:21:31.105660Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:21:31.110662Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:21:31.112480Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:21:31.120157Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:21:31.121305Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:21:31.129986Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:21:31.135448Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:21:31.135473Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.152803Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:21:31.158531Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:21:31.158550Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=2372 selected_horizon=2372 endpoint_lower_bound=896 lower_bound_gap=1476 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:31.160809Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=2372
2026-09-11T21:21:31.172498Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:21:31.172981Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:21:31.172990Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.174109Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:21:31.194305Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:21:31.195410Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:21:31.195428Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.197771Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:21:31.206890Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:21:31.207267Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:21:31.207276Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.208437Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:21:31.216951Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:21:31.217273Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:21:31.217280Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.218144Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:21:31.226742Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:21:31.228559Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:21:31.236540Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:31.236974Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:21:31.236992Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.244193Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:21:31.244235Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:31.245036Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=21 row_words=157 horizon=2904
2026-09-11T21:21:31.273815Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:21:31.295119Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:21:31.295865Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:21:31.295879Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.296994Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:21:31.307630Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:31.307660Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=784 selected_horizon=784 endpoint_lower_bound=256 lower_bound_gap=528 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:31.309182Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=784
2026-09-11T21:21:31.318603Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:21:31.318972Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:31.318980Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.319932Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:21:31.324934Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:21:31.335877Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:21:31.336411Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:21:31.336422Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.337531Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:21:31.338810Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:21:31.340535Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:21:31.340548Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.350932Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:21:31.534647Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:21:31.559638Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:21:31.559671Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.577779Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:21:31.579023Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:21:31.610007Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:21:31.631958Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:21:31.631986Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.640184Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:21:31.646632Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:21:31.664679Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:21:31.664710Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.667984Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:21:31.668004Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.698173Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:21:31.711282Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:21:31.713674Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:21:31.737538Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:21:31.743990Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:21:31.744584Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:21:31.744595Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.745759Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:21:31.757665Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:21:31.758136Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:31.758144Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.759662Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:21:31.761539Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:21:31.761556Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.772255Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:31.772281Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.781013Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:21:31.791030Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:21:31.792166Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:21:31.848269Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:21:31.849803Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:21:31.849821Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.858590Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:21:31.859995Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:21:31.866631Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:21:31.866647Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:21:31.877106Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:21:31.906797Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:21:31.964306Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:31.964343Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:31.984807Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:21:32.006858Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:21:32.006890Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:32.023714Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:21:32.100150Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:21:32.100185Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=12621 selected_horizon=12621 endpoint_lower_bound=7996 lower_bound_gap=4625 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:32.140857Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=3484 success=true
2026-09-11T21:21:32.151524Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:21:32.151553Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10603 selected_horizon=10603 endpoint_lower_bound=7872 lower_bound_gap=2731 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:32.159110Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=10603
2026-09-11T21:21:32.164581Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=70 row_words=2132 horizon=12621
2026-09-11T21:21:32.213620Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:21:32.217762Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:21:32.227920Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:21:32.227956Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=13901 selected_horizon=13901 endpoint_lower_bound=8704 lower_bound_gap=5197 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:32.228042Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:32.238414Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:21:32.239410Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:21:32.239437Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.263015Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:21:32.263044Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.267284Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:21:32.267919Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:21:32.269014Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13901
2026-09-11T21:21:32.282438Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:21:32.308312Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:32.308338Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=256 lower_bound_gap=590 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:32.309910Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=846
2026-09-11T21:21:32.321281Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:21:32.321314Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.321770Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:21:32.322320Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:32.322342Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.323797Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:21:32.330124Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:21:32.332771Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:21:32.334086Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:21:32.334104Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.334848Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:21:32.336628Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:21:32.343349Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:21:32.343540Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:21:32.343598Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:21:32.344599Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:21:32.352175Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:21:32.387239Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:21:32.387275Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=2372 selected_horizon=2372 endpoint_lower_bound=896 lower_bound_gap=1476 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:32.389499Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=2372
2026-09-11T21:21:32.401999Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:21:32.402496Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:21:32.402514Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.403714Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:21:32.425108Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:21:32.426130Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:21:32.426159Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.428352Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:21:32.439940Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:21:32.440313Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:21:32.440322Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.441499Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:21:32.449973Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:21:32.450293Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:21:32.450309Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.451143Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:21:32.459159Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:21:32.618144Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:21:32.642077Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:32.642105Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.654618Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:21:32.678000Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:21:32.678708Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:32.678721Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.680375Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:21:32.732187Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:21:32.757961Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:32.757987Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:21:32.774596Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:21:32.790571Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:21:32.790597Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:32.804613Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:21:32.813316Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:21:32.849964Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:21:32.851028Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:21:32.851043Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:21:32.853589Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:21:32.869299Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:21:32.869932Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:21:32.869940Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:21:32.871473Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:21:32.915162Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:21:32.924376Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:21:32.996553Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:21:33.023760Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:21:33.023788Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:33.047401Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:21:33.231130Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:33.231166Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:33.242394Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:21:33.287239Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:21:33.287265Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:33.308108Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:21:33.309005Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=712 row_words=446 horizon=14529
2026-09-11T21:21:33.331122Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:21:33.331157Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:33.352255Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:21:33.361961Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:21:33.379183Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:21:33.379670Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:33.379680Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:33.380889Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:21:33.391532Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:21:33.391898Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:33.391904Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:33.393084Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:21:33.407871Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:21:33.419184Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:21:33.419220Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:21:33.433851Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:21:33.437419Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:21:33.443116Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:21:33.478066Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=4885 success=true
2026-09-11T21:21:33.860321Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:21:33.885113Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:21:33.885146Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=12621 selected_horizon=12621 endpoint_lower_bound=7996 lower_bound_gap=4625 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:33.908360Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:21:33.908391Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:33.924982Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:21:33.940391Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=70 row_words=2132 horizon=12621
2026-09-11T21:21:33.971885Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:21:33.971918Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=13739 selected_horizon=13739 endpoint_lower_bound=7872 lower_bound_gap=5867 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:33.981119Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=44 row_words=205 horizon=13739
2026-09-11T21:21:34.042400Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:21:34.050544Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:21:34.055939Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:21:34.055961Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.060935Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:21:34.070236Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:21:34.075877Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:21:34.075899Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.080977Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=90 row_words=107 horizon=2426
2026-09-11T21:21:34.088785Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:21:34.090833Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:21:34.091724Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:21:34.092342Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:21:34.116732Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:21:34.116763Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.173518Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:21:34.213685Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:34.213719Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.225536Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:21:34.261494Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=5473 success=true
2026-09-11T21:21:34.265394Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:21:34.265540Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:21:34.265981Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:34.266005Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.267433Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:21:34.290110Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:21:34.290130Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8679 selected_horizon=8679 endpoint_lower_bound=6912 lower_bound_gap=1767 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:34.291500Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=88 row_words=39 horizon=8679
2026-09-11T21:21:34.302343Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:21:34.302782Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:34.302788Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.304150Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:34.345177Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:21:34.351912Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:21:34.362517Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:21:34.363823Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:21:34.363844Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.384177Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:21:34.532983Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:21:34.594401Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:21:34.594426Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.653737Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:21:34.661180Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:21:34.661199Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:21:34.672908Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:21:34.689449Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:21:34.693154Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:21:34.724849Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:21:34.724877Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.728168Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:21:34.728644Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:34.728657Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.729934Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:21:34.739881Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:21:34.740717Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:21:34.744318Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:21:34.744956Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:21:34.744966Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.746615Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=53 row_words=38 horizon=6856
2026-09-11T21:21:34.764049Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:34.764070Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.776498Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:21:34.783715Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:21:34.784821Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:21:34.784836Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.791652Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:21:34.800192Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:21:34.800902Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:34.800911Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:34.803043Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:21:34.841049Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:21:34.880813Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:34.880851Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:21:34.933973Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:21:34.976291Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:34.976333Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=15180 selected_horizon=15180 endpoint_lower_bound=9760 lower_bound_gap=5420 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:34.986860Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:21:34.988658Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:21:34.988683Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:21:34.993195Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:21:35.002602Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=538 horizon=15180
2026-09-11T21:21:35.020091Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:21:35.021272Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:21:35.021293Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:21:35.023807Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:21:35.086127Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:21:35.097788Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:21:35.097815Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.099755Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:21:35.113108Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:21:35.114940Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:21:35.199821Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:21:35.273710Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:21:35.273746Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.276832Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:21:35.320666Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:21:35.320692Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.324945Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:21:35.338305Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:21:35.364063Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:21:35.385623Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:35.385648Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.401061Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:21:35.401649Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:35.401668Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.403149Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:21:35.404172Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:21:35.424987Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:21:35.451172Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:35.451218Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=784 selected_horizon=784 endpoint_lower_bound=256 lower_bound_gap=528 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:35.453129Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=784
2026-09-11T21:21:35.463060Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:21:35.463470Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:35.463480Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.464960Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:21:35.472520Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:21:35.482227Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:21:35.489337Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:21:35.490045Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:21:35.490059Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.491888Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:21:35.506267Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:21:35.506287Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.535486Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:21:35.542665Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:21:35.569346Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:35.569367Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:21:35.604327Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:21:35.635103Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:21:35.636066Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:21:35.636080Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:21:35.638548Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:21:35.654574Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:21:35.655241Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:21:35.655254Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:21:35.656773Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:21:35.703639Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:21:35.717549Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:21:35.785843Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:35.785880Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:35.786303Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:21:35.807391Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:21:35.807417Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:35.823132Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:21:35.991015Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:36.019312Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:21:36.022186Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:21:36.026020Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:36.045647Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:21:36.045902Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:21:36.049526Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:36.049551Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.049992Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:21:36.054171Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:21:36.054198Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:21:36.054984Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:21:36.061004Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:21:36.063404Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:21:36.064427Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:21:36.065152Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:21:36.065965Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:21:36.071811Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:21:36.073098Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:21:36.073127Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.082889Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:21:36.083424Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:21:36.083441Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.084866Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:21:36.085539Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:21:36.099939Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:21:36.107517Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:21:36.107950Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:36.107957Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.109249Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:21:36.119009Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:36.119036Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.161177Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:21:36.163397Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:21:36.163414Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.165682Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=723 row_words=30 horizon=2545
2026-09-11T21:21:36.172831Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:21:36.280174Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:36.329825Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:36.330794Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:36.330807Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.333728Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:36.350707Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:21:36.351322Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:36.351333Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.353158Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:21:36.359324Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:21:36.362885Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:21:36.367495Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:21:36.378164Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:21:36.378563Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:36.378572Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.379873Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:36.425686Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:21:36.426183Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:21:36.435550Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:21:36.446610Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:21:36.446633Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.455383Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:21:36.572042Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:21:36.592311Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:21:36.592333Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.611142Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:21:36.675945Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:21:36.675978Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:36.691739Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:21:36.812445Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:21:36.827540Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:21:36.827585Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:36.834561Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=430 row_words=48 horizon=14502
2026-09-11T21:21:36.835872Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:36.835896Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.847835Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:21:36.855470Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:21:36.863944Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:21:36.863964Z  INFO local_candidate{attempt=0}: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
2026-09-11T21:21:36.870331Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:21:36.870998Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:36.871009Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:36.872549Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:21:36.876547Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:21:36.960880Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:21:36.989261Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:36.989290Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:21:37.024553Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:21:37.055722Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:21:37.056647Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:21:37.056662Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:21:37.058896Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:21:37.074198Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:21:37.074844Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:21:37.074854Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:21:37.076341Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:21:37.127382Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:21:37.137314Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:21:37.253130Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:21:37.268120Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:21:37.307081Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:21:37.307107Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:37.322757Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:21:37.322785Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=8490 selected_horizon=8490 endpoint_lower_bound=6600 lower_bound_gap=1890 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:37.377634Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:21:37.407579Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:21:37.408099Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:37.408107Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:37.409611Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:21:37.431095Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:21:37.444892Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:21:37.445311Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:37.445321Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:37.446793Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:21:37.456801Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:21:37.457187Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:37.457217Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:37.458262Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:21:37.463473Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:21:37.473754Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:21:37.473981Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=75 row_words=2610 horizon=8490
2026-09-11T21:21:37.474287Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:21:37.474296Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:37.475578Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:21:37.489806Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:21:37.511382Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:21:37.511408Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:37.541488Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:21:37.870003Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:21:37.901101Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:37.901128Z  INFO local_candidate{attempt=0}: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
2026-09-11T21:21:37.943836Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:21:37.980040Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:21:37.981227Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:21:37.981242Z  INFO local_candidate{attempt=0}: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
2026-09-11T21:21:37.984162Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:21:38.001141Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:21:38.001827Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:21:38.001837Z  INFO local_candidate{attempt=0}: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
2026-09-11T21:21:38.003626Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:21:38.041604Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:21:38.041641Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=12621 selected_horizon=12621 endpoint_lower_bound=7996 lower_bound_gap=4625 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:38.051272Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:21:38.061613Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:21:38.101253Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=70 row_words=2132 horizon=12621
2026-09-11T21:21:38.101811Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:21:38.126064Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:21:38.126099Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7030 selected_horizon=7030 endpoint_lower_bound=3240 lower_bound_gap=3790 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:38.159717Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=281 horizon=7030
2026-09-11T21:21:38.163498Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:38.163527Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.182668Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:21:38.230428Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:21:38.233272Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:21:38.238550Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:21:38.238569Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.238639Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:21:38.240145Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:21:38.240161Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.244163Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=90 row_words=107 horizon=2426
2026-09-11T21:21:38.248858Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:21:38.255890Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:21:38.272516Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:21:38.272902Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:38.272911Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.274513Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:21:38.284734Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:21:38.285102Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:38.285110Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.286364Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:21:38.291683Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:21:38.296449Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:21:38.297700Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:38.297727Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.298247Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:21:38.304874Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:21:38.305855Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:21:38.314131Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:21:38.318336Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:21:38.329188Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:21:38.329604Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:21:38.329613Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.331901Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:21:38.343596Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:21:38.344028Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:21:38.344035Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.345275Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:21:38.361271Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:21:38.361897Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:21:38.361907Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.363422Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:21:38.371653Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:21:38.371951Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:21:38.371957Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.373063Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:21:38.375676Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:21:38.377325Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:21:38.377339Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.381094Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:21:38.381390Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:21:38.381399Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.382269Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:21:38.385709Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:21:38.390478Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:21:38.535881Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:21:38.564300Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:21:38.564340Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.593057Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:21:38.666841Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:21:38.690671Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:21:38.690710Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.715242Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:21:38.719640Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:21:38.750771Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:21:38.750807Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.810968Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:21:38.964646Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:21:38.970595Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:21:38.970623Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:38.977653Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:21:38.986897Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:21:38.989377Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:21:38.990532Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:21:38.991257Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:21:38.998047Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:21:39.010159Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:21:39.010554Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:39.010564Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.012043Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:21:39.021529Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:21:39.021906Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:39.021913Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.022891Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:21:39.027746Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:21:39.032045Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:21:39.033710Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:21:39.040102Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:21:39.041025Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:21:39.048991Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:21:39.063724Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:21:39.064151Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:21:39.064160Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.066265Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:21:39.077449Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:21:39.077893Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:21:39.077901Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.079090Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:21:39.094562Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:21:39.095255Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:21:39.095273Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.097370Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:21:39.109484Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:21:39.109925Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:21:39.109936Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.111370Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:21:39.120450Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:21:39.120766Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:21:39.120773Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.121718Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:21:39.130707Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:21:39.138034Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:39.138063Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14420 selected_horizon=14420 endpoint_lower_bound=9072 lower_bound_gap=5348 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:39.219813Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=707 row_words=446 horizon=14420
2026-09-11T21:21:39.235146Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:21:39.287483Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:21:39.287509Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.357258Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:21:39.386094Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:21:39.386604Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:39.386614Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.387915Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:21:39.410127Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:21:39.424287Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:21:39.424651Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:39.424661Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.426682Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:21:39.436632Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:21:39.436980Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:39.436988Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.437972Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:21:39.442982Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:21:39.453369Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:21:39.453859Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:21:39.453865Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.455137Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:21:39.470274Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:21:39.532283Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:39.532311Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.552149Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:21:39.613639Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:21:39.615029Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:21:39.615046Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.623363Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:21:39.789782Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:21:39.854118Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:21:39.854144Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.887437Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:21:39.906704Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:21:39.911544Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:21:39.911567Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:39.939783Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:21:40.010895Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:40.038404Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:40.038440Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.069326Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:40.091508Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:40.091984Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:40.091993Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.093224Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:40.103402Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:21:40.103782Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:21:40.103789Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.104733Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:21:40.513006Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:21:40.513110Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=13747 selected_horizon=13747 endpoint_lower_bound=8704 lower_bound_gap=5043 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:40.560971Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=270 horizon=13747
2026-09-11T21:21:40.606701Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:21:40.626485Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:40.626516Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:40.671757Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:40.671791Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.694005Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:21:40.695170Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:21:40.742082Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=69127 maximum_identical_destinations=1
2026-09-11T21:21:40.742117Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=5642 selected_horizon=5642 endpoint_lower_bound=4464 lower_bound_gap=1178 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.766320Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:21:40.768395Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:21:40.768413Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.781013Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:21:40.816855Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=164 row_words=914 horizon=5642
2026-09-11T21:21:40.819346Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:21:40.838409Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:40.896798Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:21:40.901009Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:21:40.905342Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:40.905365Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.905717Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:21:40.916443Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:40.916863Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:40.916871Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.918180Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:40.938034Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:21:40.957096Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:21:40.962341Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=12014 maximum_identical_destinations=1
2026-09-11T21:21:40.962359Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=7189 selected_horizon=7189 endpoint_lower_bound=6756 lower_bound_gap=433 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:40.965794Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:21:40.968739Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=79 row_words=125 horizon=7189
2026-09-11T21:21:40.975892Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:21:40.977279Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:21:40.979632Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:21:40.980566Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:21:40.981234Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:21:41.001353Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:21:41.001389Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.055698Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:21:41.067222Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:41.076747Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:21:41.089887Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:21:41.102353Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:21:41.102378Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.105284Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:21:41.117371Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:21:41.117394Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.118628Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:41.119612Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:41.119628Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.120579Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:21:41.120603Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.122252Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:41.125676Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:21:41.139439Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:41.140027Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:41.140037Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.141815Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=5448
2026-09-11T21:21:41.142827Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:21:41.143332Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:41.143343Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.144028Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:21:41.144757Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:21:41.147109Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:21:41.166707Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:41.166742Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=256 lower_bound_gap=590 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:41.167908Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:21:41.167930Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8679 selected_horizon=8679 endpoint_lower_bound=6912 lower_bound_gap=1767 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:41.168653Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=846
2026-09-11T21:21:41.169242Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=88 row_words=39 horizon=8679
2026-09-11T21:21:41.178585Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:21:41.178967Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:41.178977Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.179285Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:21:41.179704Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:21:41.179712Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.180110Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:21:41.180890Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:21:41.185306Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:21:41.190046Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:21:41.191826Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:21:41.196814Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:21:41.197473Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:21:41.197485Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.198661Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:21:41.198928Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:21:41.199670Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:21:41.206868Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:21:41.207062Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:21:41.207374Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:21:41.207383Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.208453Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:21:41.214645Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:21:41.216732Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:21:41.217030Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:21:41.217036Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.217944Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:21:41.226486Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:21:41.231397Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:21:41.231422Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=2372 selected_horizon=2372 endpoint_lower_bound=896 lower_bound_gap=1476 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:41.233408Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=2372
2026-09-11T21:21:41.250220Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:21:41.250690Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:41.250699Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.252117Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:21:41.274610Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:21:41.274633Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8679 selected_horizon=8679 endpoint_lower_bound=6912 lower_bound_gap=1767 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:41.275856Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=88 row_words=39 horizon=8679
2026-09-11T21:21:41.292916Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:21:41.298500Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:21:41.298522Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.303214Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:21:41.366059Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:21:41.390773Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:21:41.390797Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.403454Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:21:41.429478Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:21:41.430218Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:41.430233Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.431992Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:21:41.486445Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:41.486486Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:41.677687Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:41.745466Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:21:41.745499Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=784 selected_horizon=784 endpoint_lower_bound=256 lower_bound_gap=528 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:41.747183Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=784
2026-09-11T21:21:41.757260Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:21:41.757676Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:21:41.757686Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.758747Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:21:41.765953Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:21:41.779002Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:21:41.779518Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:21:41.779529Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:41.780814Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:21:41.863158Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:21:41.863193Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7030 selected_horizon=7030 endpoint_lower_bound=3240 lower_bound_gap=3790 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:41.895664Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=281 horizon=7030
2026-09-11T21:21:41.951094Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:21:41.975096Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:21:41.975135Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=11475 selected_horizon=11475 endpoint_lower_bound=6912 lower_bound_gap=4563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:41.989104Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:21:41.989130Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:42.010563Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:21:42.039217Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:21:42.052453Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:21:42.053520Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:21:42.053533Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:42.061024Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:21:42.062611Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:21:42.062632Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:42.095235Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:21:42.135153Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=65 row_words=2803 horizon=11475
2026-09-11T21:21:42.199769Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:21:42.264158Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:21:42.264188Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:42.364750Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:21:42.378254Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:21:42.390760Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:21:42.390787Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:42.400522Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:21:42.400981Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:42.400992Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:42.402342Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:21:42.407848Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:21:42.424472Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:21:42.424502Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:42.425645Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8139
2026-09-11T21:21:42.602164Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:21:42.640065Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:42.640093Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:42.665584Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:21:42.961421Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:21:43.071666Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:43.071713Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.275458Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:43.339216Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:21:43.339894Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:21:43.339908Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.341124Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:21:43.347343Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:21:43.351440Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:21:43.356320Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:21:43.366492Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:21:43.366976Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:21:43.366986Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.368105Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:21:43.379027Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:21:43.379474Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:43.379485Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.380864Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:21:43.386366Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:21:43.403071Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:21:43.422763Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:43.422790Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.423002Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:21:43.458738Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:21:43.458739Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:21:43.464422Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:21:43.464445Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.468593Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:21:43.482706Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:21:43.483186Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:43.483193Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.484683Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:21:43.496534Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:21:43.496956Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:43.496962Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.498354Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:21:43.531331Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:43.531365Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.543221Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:21:43.546484Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:21:43.553486Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:21:43.616498Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:21:43.616531Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.661046Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:21:43.661092Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7030 selected_horizon=7030 endpoint_lower_bound=3240 lower_bound_gap=3790 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:43.710264Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=281 horizon=7030
2026-09-11T21:21:43.717389Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:21:43.728569Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:43.756846Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:21:43.757358Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:43.757369Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.758824Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:21:43.782287Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:21:43.782310Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:43.783522Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8139
2026-09-11T21:21:43.803583Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:21:43.859531Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:21:43.859568Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:43.931628Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:21:43.955256Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:21:43.958860Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:21:43.963388Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:21:44.065543Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:21:44.078583Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:21:44.078614Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=13901 selected_horizon=13901 endpoint_lower_bound=8704 lower_bound_gap=5197 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:44.088096Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:21:44.088127Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:44.097005Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=139 row_words=185 horizon=10717
2026-09-11T21:21:44.101292Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:21:44.101314Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.116609Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13901
2026-09-11T21:21:44.120826Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:21:44.158812Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:21:44.159720Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:21:44.159735Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.166439Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:21:44.237038Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:21:44.239372Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:21:44.239410Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=12621 selected_horizon=12621 endpoint_lower_bound=7996 lower_bound_gap=4625 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:44.256751Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:21:44.256770Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.276735Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:21:44.296528Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:21:44.297020Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:21:44.297031Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.298048Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:21:44.300946Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=70 row_words=2132 horizon=12621
2026-09-11T21:21:44.318357Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:21:44.318384Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:44.335516Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:21:44.431236Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:21:44.436943Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=11520 maximum_identical_destinations=1
2026-09-11T21:21:44.436964Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=2426 selected_horizon=2426 endpoint_lower_bound=2304 lower_bound_gap=122 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.442390Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=90 row_words=107 horizon=2426
2026-09-11T21:21:44.444025Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:21:44.450195Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:21:44.452359Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:21:44.453292Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:21:44.453962Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:21:44.454596Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:21:44.454615Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.466413Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:21:44.466441Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:44.470138Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:21:44.473761Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:21:44.490914Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:44.490951Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:44.494809Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:21:44.566090Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:21:44.566124Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.585443Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:21:44.607477Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:21:44.607499Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.621687Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:21:44.627889Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:21:44.727615Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:21:44.734256Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:21:44.734287Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:44.739397Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:21:44.925214Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=162 row_words=1526 horizon=14751
2026-09-11T21:21:45.563848Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:21:45.593470Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:45.593504Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:45.629751Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:21:45.652572Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:21:45.653034Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:45.653042Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:45.654418Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:21:45.665571Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:21:45.665990Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:45.666006Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:45.667353Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:21:45.710606Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:21:45.711049Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:21:45.720063Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:21:45.753319Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:45.753360Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:45.781619Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:21:45.905883Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:21:45.905935Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:45.938908Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:21:46.051057Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:21:46.051098Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=13747 selected_horizon=13747 endpoint_lower_bound=8704 lower_bound_gap=5043 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:46.086288Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=270 horizon=13747
2026-09-11T21:21:46.101739Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:21:46.133771Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:21:46.133797Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7298 selected_horizon=7298 endpoint_lower_bound=4656 lower_bound_gap=2642 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:46.165087Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:21:46.167014Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=13 row_words=347 horizon=7298
2026-09-11T21:21:46.170559Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:21:46.170579Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:46.175244Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:21:46.250424Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:21:46.250456Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=13739 selected_horizon=13739 endpoint_lower_bound=7872 lower_bound_gap=5867 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:46.259668Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=44 row_words=205 horizon=13739
2026-09-11T21:21:46.462819Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:21:46.473755Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:21:46.473778Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:46.475529Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:21:46.475557Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:46.489701Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:21:46.491530Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:21:46.619589Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:21:46.619621Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10603 selected_horizon=10603 endpoint_lower_bound=7872 lower_bound_gap=2731 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:46.626352Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=10603
2026-09-11T21:21:46.680892Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:21:46.680936Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:46.721302Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=265 horizon=14267
2026-09-11T21:21:46.811996Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:21:46.812461Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:21:46.849171Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:21:46.849212Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:46.865499Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:21:46.886708Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:21:46.886737Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:46.902181Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:21:46.903138Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:21:46.903152Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:46.909947Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:21:46.937683Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:21:46.957828Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:21:46.957865Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7030 selected_horizon=7030 endpoint_lower_bound=3240 lower_bound_gap=3790 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:46.977630Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:46.978763Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:46.978790Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:46.981236Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:46.990631Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=281 horizon=7030
2026-09-11T21:21:46.998076Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:21:46.998770Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:46.998781Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:47.000611Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:21:47.177910Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:21:47.198349Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:21:47.198973Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:21:47.198992Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:47.204474Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:21:47.204507Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=11450 selected_horizon=11450 endpoint_lower_bound=6912 lower_bound_gap=4538 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:47.208583Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:21:47.208603Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:47.218786Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:21:47.224427Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:21:47.359980Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=65 row_words=2800 horizon=11450
2026-09-11T21:21:47.419961Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:21:47.454098Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:47.454130Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:47.490191Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:21:47.512840Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:21:47.513339Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:47.513349Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:47.514690Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:21:47.526183Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:21:47.526622Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:47.526631Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:47.527929Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:21:47.571983Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:21:47.581467Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:21:47.602289Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:21:47.602325Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:47.618170Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:21:47.717450Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=128104 maximum_identical_destinations=1
2026-09-11T21:21:47.717485Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=8960 selected_horizon=8960 endpoint_lower_bound=6912 lower_bound_gap=2048 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:47.739674Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:21:47.739703Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=10603 selected_horizon=10603 endpoint_lower_bound=7872 lower_bound_gap=2731 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:47.746330Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=10603
2026-09-11T21:21:47.852458Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=154 row_words=1272 horizon=8960
2026-09-11T21:21:47.916635Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:47.940911Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:47.940933Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:47.968584Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:47.987514Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=127912 maximum_identical_destinations=1
2026-09-11T21:21:47.987552Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=11475 selected_horizon=11475 endpoint_lower_bound=6912 lower_bound_gap=4563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:47.988671Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:47.989073Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:47.989080Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:47.990349Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:48.049751Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:21:48.076705Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:21:48.076729Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:48.109164Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:21:48.112763Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:21:48.112793Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=13739 selected_horizon=13739 endpoint_lower_bound=7872 lower_bound_gap=5867 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:48.121824Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=44 row_words=205 horizon=13739
2026-09-11T21:21:48.128807Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:21:48.129221Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:48.129230Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:48.130472Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:21:48.140913Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:21:48.141306Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:48.141314Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:48.142526Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:21:48.142998Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=65 row_words=2803 horizon=11475
2026-09-11T21:21:48.183363Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:21:48.192005Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:21:48.346184Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:48.426523Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:21:48.432471Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:48.432504Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:48.445576Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:21:48.445596Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:48.464746Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:21:48.592344Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:48.697698Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:21:48.697734Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:48.704580Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:48.704614Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=6016 lower_bound_gap=8486 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:48.705468Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=139 row_words=185 horizon=10717
2026-09-11T21:21:48.909087Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:21:48.909125Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:48.924588Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:21:48.960217Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:21:48.960254Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:49.046303Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:21:49.046336Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:49.053080Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:21:49.091114Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=149 row_words=1113 horizon=8617
2026-09-11T21:21:49.109666Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=225 row_words=1557 horizon=14502
2026-09-11T21:21:49.154184Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:21:49.154229Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=13747 selected_horizon=13747 endpoint_lower_bound=8704 lower_bound_gap=5043 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:49.193020Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=270 horizon=13747
2026-09-11T21:21:49.645140Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:49.645179Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14420 selected_horizon=14420 endpoint_lower_bound=9072 lower_bound_gap=5348 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:49.723932Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=707 row_words=444 horizon=14420
2026-09-11T21:21:50.045483Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:21:50.109473Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=33198 maximum_identical_destinations=1
2026-09-11T21:21:50.109504Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=16451 selected_horizon=16451 endpoint_lower_bound=11940 lower_bound_gap=4511 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.125873Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:21:50.125905Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:50.158749Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=78 row_words=593 horizon=16451
2026-09-11T21:21:50.235630Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:21:50.235674Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:50.248439Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:50.266462Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:21:50.296309Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:50.296867Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:50.296877Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.298301Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:21:50.327609Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:21:50.337036Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:50.337061Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.398415Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:21:50.463625Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=32720 maximum_identical_destinations=1
2026-09-11T21:21:50.463660Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=6489 selected_horizon=6489 endpoint_lower_bound=5796 lower_bound_gap=693 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.469940Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:21:50.495617Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:50.495640Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.495689Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:50.513024Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:50.513060Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:50.513264Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=71 row_words=618 horizon=6489
2026-09-11T21:21:50.525376Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=136 horizon=822
2026-09-11T21:21:50.544560Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:50.545411Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:50.545428Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.548096Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:50.552757Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:50.553653Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:50.553667Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.556555Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:50.564448Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:21:50.565013Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:50.565022Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.566860Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:21:50.572826Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:21:50.573436Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:50.573446Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.575259Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:21:50.586813Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=712 row_words=446 horizon=14529
2026-09-11T21:21:50.626884Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:21:50.654552Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:21:50.654589Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.678335Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:21:50.697976Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:50.698424Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:50.698434Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:50.699628Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:50.713564Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:21:50.713609Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:50.751472Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=265 horizon=14267
2026-09-11T21:21:51.101242Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:51.101280Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=15180 selected_horizon=15180 endpoint_lower_bound=9760 lower_bound_gap=5420 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:51.123149Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=538 horizon=15180
2026-09-11T21:21:51.147774Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:51.148237Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:51.148249Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.149557Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:51.271735Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:51.296444Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:51.296471Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.307729Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:21:51.323773Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:51.343651Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:21:51.344068Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:21:51.344075Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.345389Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:21:51.354954Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:21:51.366414Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:51.367118Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:21:51.367128Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.369660Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:21:51.378850Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:51.378867Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.385585Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:21:51.386178Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:21:51.386188Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.387982Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:21:51.395043Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:51.395062Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.407351Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:51.419050Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:21:51.483864Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:21:51.483899Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.537384Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:21:51.549614Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:51.605520Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:21:51.642129Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:51.642159Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.663275Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:21:51.816371Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:21:51.840837Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:21:51.840864Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:51.868285Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:21:52.181390Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:21:52.181426Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=15180 selected_horizon=15180 endpoint_lower_bound=9760 lower_bound_gap=5420 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:52.206293Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=538 horizon=15180
2026-09-11T21:21:52.480134Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:21:52.557586Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:21:52.557612Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:21:52.698422Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:21:52.752367Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:52.752402Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14420 selected_horizon=14420 endpoint_lower_bound=9072 lower_bound_gap=5348 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:52.836947Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=707 row_words=446 horizon=14420
2026-09-11T21:21:53.706063Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:53.706102Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:53.774447Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=712 row_words=446 horizon=14529
2026-09-11T21:21:54.546091Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:54.546126Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14747 selected_horizon=14747 endpoint_lower_bound=6016 lower_bound_gap=8731 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:54.869086Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:21:54.869126Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14420 selected_horizon=14420 endpoint_lower_bound=9072 lower_bound_gap=5348 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:54.903391Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14747
2026-09-11T21:21:54.947636Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=707 row_words=446 horizon=14420
2026-09-11T21:21:54.979525Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=22838 success=true
2026-09-11T21:21:57.181216Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:21:57.181258Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:21:57.578701Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=109 row_words=1526 horizon=14755
2026-09-11T21:22:01.771616Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:01.771651Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=6016 lower_bound_gap=8486 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:01.886686Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:01.886723Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:02.159285Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=225 row_words=1557 horizon=14502
2026-09-11T21:22:02.299161Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=109 row_words=1526 horizon=14755
2026-09-11T21:22:02.372080Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=28893 success=true
2026-09-11T21:22:02.372530Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=32823 success=true
2026-09-11T21:22:02.440287Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:02.440324Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=6016 lower_bound_gap=8486 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:02.856568Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=225 row_words=1557 horizon=14502
2026-09-11T21:22:02.938255Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=33166 success=true
2026-09-11T21:22:02.939057Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=28677 success=true
2026-09-11T21:22:02.942568Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=36815 success=true
2026-09-11T21:22:03.976575Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:22:04.000677Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9021 success=true
2026-09-11T21:22:04.014361Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=68951 maximum_identical_destinations=1
2026-09-11T21:22:04.014385Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=9167 selected_horizon=9167 endpoint_lower_bound=7996 lower_bound_gap=1171 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:04.025174Z  INFO local_candidate{attempt=5}: costed final placed program final_cycles=15618439 final_exchange=6636664
2026-09-11T21:22:04.081617Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=78 row_words=2149 horizon=9167
2026-09-11T21:22:04.187235Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=38061 success=true
2026-09-11T21:22:05.158781Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=230 success=true
2026-09-11T21:22:05.241797Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=82 success=true
2026-09-11T21:22:05.731579Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=395 success=true
2026-09-11T21:22:07.963337Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=42444 success=true
2026-09-11T21:22:07.996464Z  INFO local_candidate{attempt=1}: costed final placed program final_cycles=15412969 final_exchange=6669658
2026-09-11T21:22:09.151171Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=186 success=true
2026-09-11T21:22:09.247059Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=95 success=true
2026-09-11T21:22:09.698741Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=406 success=true
2026-09-11T21:22:11.588210Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9216 success=true
2026-09-11T21:22:11.595244Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9222 success=true
2026-09-11T21:22:11.613496Z  INFO local_candidate{attempt=2}: costed final placed program final_cycles=15495015 final_exchange=6997864
2026-09-11T21:22:11.619632Z  INFO local_candidate{attempt=3}: costed final placed program final_cycles=15453658 final_exchange=6973435
2026-09-11T21:22:12.417058Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9474 success=true
2026-09-11T21:22:12.443362Z  INFO local_candidate{attempt=6}: costed final placed program final_cycles=15817402 final_exchange=6848749
2026-09-11T21:22:12.705674Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9766 success=true
2026-09-11T21:22:12.734070Z  INFO local_candidate{attempt=0}: costed final placed program final_cycles=15324756 final_exchange=6885173
2026-09-11T21:22:12.745164Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9806 success=true
2026-09-11T21:22:12.753437Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=291 success=true
2026-09-11T21:22:12.753452Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=299 success=true
2026-09-11T21:22:12.780244Z  INFO local_candidate{attempt=4}: costed final placed program final_cycles=15801418 final_exchange=6881851
2026-09-11T21:22:12.833566Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=80 success=true
2026-09-11T21:22:12.853441Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=99 success=true
2026-09-11T21:22:13.300570Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=404 success=true
2026-09-11T21:22:13.354762Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=410 success=true
2026-09-11T21:22:13.534616Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=176 success=true
2026-09-11T21:22:13.621281Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=86 success=true
2026-09-11T21:22:13.796751Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9609 success=true
2026-09-11T21:22:13.822997Z  INFO local_candidate{attempt=7}: costed final placed program final_cycles=15669197 final_exchange=6680348
2026-09-11T21:22:13.979550Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=348 success=true
2026-09-11T21:22:13.983588Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=253 success=true
2026-09-11T21:22:14.068112Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=84 success=true
2026-09-11T21:22:14.072781Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-11T21:22:14.254911Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=387 success=true
2026-09-11T21:22:14.530021Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=395 success=true
2026-09-11T21:22:14.538811Z  INFO local_candidate{attempt=0}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=388 success=true
2026-09-11T21:22:14.943716Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=237 success=true
2026-09-11T21:22:15.032812Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=89 success=true
2026-09-11T21:22:15.531280Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=362 success=true
2026-09-11T21:22:18.348068Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=0 before=15983398 after=15324756 changed_operations=[] opened_boundaries=[]
2026-09-11T21:22:21.285591Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=7 threads=16
2026-09-11T21:22:26.155790Z  INFO local_candidate{attempt=2}: screened exchange table geometry expansion_ms=3959 expansion_and_footprint_ms=4869 estimated_row_bytes=71072 heuristic_row_bytes=145624 geometry_fragments_per_tile=8105 fragment_limit=16384
2026-09-11T21:22:26.264094Z  INFO local_candidate{attempt=2}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:22:26.265992Z  INFO local_candidate{attempt=5}: screened exchange table geometry expansion_ms=4066 expansion_and_footprint_ms=4980 estimated_row_bytes=70496 heuristic_row_bytes=146312 geometry_fragments_per_tile=8062 fragment_limit=16384
2026-09-11T21:22:26.326416Z  INFO local_candidate{attempt=3}: screened exchange table geometry expansion_ms=4125 expansion_and_footprint_ms=5040 estimated_row_bytes=70896 heuristic_row_bytes=146672 geometry_fragments_per_tile=8058 fragment_limit=16384
2026-09-11T21:22:26.377120Z  INFO local_candidate{attempt=5}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:22:26.398855Z  INFO local_candidate{attempt=4}: screened exchange table geometry expansion_ms=4186 expansion_and_footprint_ms=5112 estimated_row_bytes=70712 heuristic_row_bytes=147276 geometry_fragments_per_tile=8089 fragment_limit=16384
2026-09-11T21:22:26.437931Z  INFO local_candidate{attempt=3}: eliminated unread FP8 cast input padding clears removed=1098
2026-09-11T21:22:26.511525Z  INFO local_candidate{attempt=4}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:22:26.739882Z  INFO local_candidate{attempt=1}: screened exchange table geometry expansion_ms=4530 expansion_and_footprint_ms=5453 estimated_row_bytes=71800 heuristic_row_bytes=147932 geometry_fragments_per_tile=8105 fragment_limit=16384
2026-09-11T21:22:26.821111Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:22:26.822837Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:22:26.823458Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:26.823468Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.825316Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:26.834505Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:22:26.834959Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:26.834968Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.836739Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:22:26.839076Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:22:26.840552Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:22:26.840565Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:22:26.843498Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:22:26.845025Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:22:26.846075Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:22:26.846090Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.846813Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:22:26.847239Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:26.847248Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.848306Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:22:26.854132Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:22:26.854514Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:22:26.854981Z  INFO local_candidate{attempt=1}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:22:26.860367Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:22:26.861871Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:22:26.862455Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:22:26.862904Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:22:26.862913Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:22:26.864654Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:22:26.870184Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:22:26.871377Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:22:26.877233Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:22:26.877750Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:26.877758Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.878349Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:22:26.879116Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:22:26.879959Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:22:26.890102Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:22:26.890602Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:22:26.891059Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:26.891065Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.891172Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:22:26.891693Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:26.891703Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.892524Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:22:26.893505Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:26.904270Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:22:26.904718Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:26.904725Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.905836Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:26.920702Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:22:26.921393Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:26.921405Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.922749Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:26.924130Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:22:26.930620Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:22:26.930939Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:26.930946Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.932024Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:22:26.940216Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:22:26.940491Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:22:26.940522Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:26.940527Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:26.941398Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:26.946044Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:22:26.948721Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:22:26.956156Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:22:26.984985Z  INFO local_candidate{attempt=7}: screened exchange table geometry expansion_ms=4727 expansion_and_footprint_ms=5698 estimated_row_bytes=68960 heuristic_row_bytes=146312 geometry_fragments_per_tile=7870 fragment_limit=16384
2026-09-11T21:22:27.040152Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:27.048159Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:27.048177Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:22:27.052352Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:22:27.052379Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:27.059161Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:27.069123Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:22:27.088264Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:22:27.088292Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=19 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:27.093026Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:22:27.094088Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:22:27.094102Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.094193Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=19 tile=21 row_words=157 horizon=2904
2026-09-11T21:22:27.098353Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:22:27.101144Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:22:27.106891Z  INFO local_candidate{attempt=7}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:22:27.115415Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:22:27.115439Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.138709Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:22:27.170039Z  INFO local_candidate{attempt=6}: screened exchange table geometry expansion_ms=4897 expansion_and_footprint_ms=5883 estimated_row_bytes=68960 heuristic_row_bytes=146312 geometry_fragments_per_tile=7870 fragment_limit=16384
2026-09-11T21:22:27.198986Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:22:27.199013Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:27.205615Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:22:27.214176Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:22:27.218429Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:22:27.223525Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:22:27.235100Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:22:27.235546Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:27.235556Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.237290Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:22:27.243811Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:22:27.247470Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:22:27.247879Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:27.247887Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.248964Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:22:27.254315Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:22:27.263900Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:27.263919Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.264302Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:22:27.264899Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:27.264907Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.266017Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:27.274895Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:27.291664Z  INFO local_candidate{attempt=6}: eliminated unread FP8 cast input padding clears removed=1386
2026-09-11T21:22:27.296268Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:22:27.297026Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:27.297036Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.298622Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:27.396028Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:22:27.409765Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:22:27.409793Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.429329Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:22:27.519338Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:22:27.519380Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:27.531063Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:22:27.551363Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:22:27.552088Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:27.552098Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.553647Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:27.608189Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:22:27.618804Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:22:27.674403Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:22:27.693670Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:27.693696Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:22:27.724522Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:22:27.758178Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:22:27.799009Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:22:27.799041Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.824108Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:22:27.852709Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:27.852740Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:27.854582Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:27.870919Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:22:27.892643Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:27.892673Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:27.920602Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:27.978180Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:22:27.999108Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:27.999137Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.011439Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:28.033824Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:22:28.034629Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:28.034642Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.036399Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:28.371582Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:22:28.389553Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:28.400787Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:28.400821Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.429997Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:28.430016Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.442318Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:22:28.445287Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:28.465521Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:22:28.466120Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:28.466128Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.467714Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:28.485025Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:22:28.513387Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:28.513407Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.521940Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:22:28.532638Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:22:28.574021Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:28.584060Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:22:28.627353Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:22:28.627386Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.640345Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:22:28.662803Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:22:28.664253Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:28.664277Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.695916Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:28.717578Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:22:28.723483Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:28.723505Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.729791Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:28.736294Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=41 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:22:28.738944Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:22:28.741361Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:22:28.742380Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:22:28.743137Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:22:28.752763Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:22:28.753162Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:28.753168Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.754538Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:28.772052Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:28.772072Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:28.775139Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:22:28.783697Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:28.784239Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:22:28.795486Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:22:28.795880Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:28.795889Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.797571Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:22:28.807135Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:22:28.807533Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:28.807543Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.808544Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:22:28.810293Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:28.810315Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:28.812230Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:28.813878Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:22:28.818784Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:22:28.820649Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:22:28.827279Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:22:28.828334Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:22:28.835054Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:22:28.837291Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:28.847496Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:22:28.847925Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:28.847933Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.849749Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:28.851409Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:28.851426Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.860223Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:22:28.860659Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:28.860666Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.861755Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:28.865469Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:28.876142Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:22:28.876792Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:28.876802Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.878146Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:28.886038Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:22:28.886373Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:28.886379Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.887461Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:22:28.895224Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:22:28.895499Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:28.895505Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.896325Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:28.898085Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:22:28.903935Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:22:28.921615Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:28.921642Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.933067Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:28.954680Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:22:28.955515Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:28.955528Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:28.957230Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:28.957479Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:28.998565Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:28.998595Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.014842Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:29.077867Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:29.084815Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:29.084832Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:22:29.095708Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:29.284587Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:29.324591Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:29.324613Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.340115Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:29.343718Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:29.347778Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:22:29.367097Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:22:29.392514Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:29.392542Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.403032Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:22:29.403056Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.408113Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:29.418086Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:29.430310Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:29.430332Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.435633Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:29.435653Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.450017Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:29.461539Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:22:29.492856Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:22:29.493487Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:29.493500Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.495252Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:22:29.497547Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:22:29.505366Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:22:29.505781Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:29.505789Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.506846Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:22:29.512045Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:22:29.522354Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:22:29.522956Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:29.522963Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.524106Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:29.531177Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:22:29.531639Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:29.531650Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.532884Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:22:29.538750Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:29.538777Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:29.554236Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:22:29.554253Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=13 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:29.555296Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8137
2026-09-11T21:22:29.568190Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:22:29.568408Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:29.585043Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:22:29.609753Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:29.609776Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.615931Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:22:29.615958Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.641149Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:29.663813Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:29.671257Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:29.671276Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:22:29.675800Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:29.682511Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:29.682531Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:22:29.718973Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:29.718996Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.726054Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:22:29.727346Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:22:29.727361Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.730151Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:22:29.730660Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:29.740740Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:29.748781Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:29.748804Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.749182Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:22:29.750076Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:22:29.750090Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.752160Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:22:29.760961Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:22:29.763657Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:29.774240Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:22:29.774691Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:29.774699Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.776834Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:22:29.787992Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:22:29.788436Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:29.788447Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.789521Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:22:29.795511Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:22:29.800785Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:22:29.802894Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:22:29.810191Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:22:29.811357Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:22:29.819876Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:22:29.820623Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:29.836265Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:22:29.836788Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:29.836796Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.838807Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:29.838826Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.839150Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:29.852143Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:22:29.852705Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:29.852716Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.854011Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:29.855014Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:29.871700Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:22:29.872505Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:29.872517Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.873459Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:22:29.873863Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:29.873868Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.874007Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:29.875033Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:29.883901Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:22:29.884323Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:29.884332Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.885485Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:22:29.894925Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:22:29.895280Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:29.895288Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:29.896317Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:29.905285Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:22:29.917504Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:22:29.926863Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:22:29.978886Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:29.985308Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:29.985327Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:22:29.995502Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:30.007438Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:22:30.035937Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:30.035961Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:22:30.069799Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:22:30.099864Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:22:30.100843Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:22:30.100859Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:22:30.103089Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:22:30.118432Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:22:30.119073Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:22:30.119082Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:22:30.120655Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:22:30.137090Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:30.157477Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:30.164957Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:22:30.174532Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:22:30.175941Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:30.175961Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.178657Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:30.178675Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.190964Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:30.196246Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:30.260400Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:22:30.284959Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:30.284998Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.294596Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:30.313442Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:22:30.314016Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:30.314025Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.315379Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:30.412929Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:30.419962Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:30.419984Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:22:30.431046Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:30.539780Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:22:30.540116Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:22:30.570536Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:30.570570Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:22:30.596899Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:22:30.596927Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.606123Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:22:30.609612Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:30.627921Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:30.627944Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.636366Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:22:30.637308Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:22:30.637323Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:22:30.639718Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:22:30.643050Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:30.655294Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:22:30.655932Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:22:30.655939Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:22:30.657497Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:22:30.670594Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:22:30.701538Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:22:30.703737Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:22:30.704376Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:30.704386Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.705924Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:30.711115Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:22:30.731367Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:22:30.750580Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=57 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:22:30.767571Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:30.767589Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:30.769694Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:22:30.782076Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:30.782090Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:30.783175Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:22:30.788675Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:22:30.810298Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=63 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:22:30.821538Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:30.821565Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.825491Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:22:30.829012Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=65 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:22:30.848785Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:30.848809Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:30.851018Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:30.852173Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:30.852189Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:22:30.859896Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:22:30.865973Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:30.865988Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:30.867359Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:30.870745Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:30.877910Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:30.877926Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:22:30.880432Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:30.880449Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:30.883899Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:22:30.886753Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:30.888922Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:30.888941Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:30.889088Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:30.890797Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:30.901394Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:30.901408Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:30.902991Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:22:30.908604Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:30.913782Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:22:30.914638Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:22:30.914650Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:22:30.916967Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:22:30.931265Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:22:30.931995Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:22:30.932605Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:22:30.932615Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:22:30.934122Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:22:30.949069Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:30.949084Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:30.950163Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:30.968134Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=71 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:22:30.978613Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:22:30.987852Z  INFO local_candidate{attempt=1}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:22:31.025732Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:22:31.025760Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.047431Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:22:31.053122Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:31.053141Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.059414Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:31.069010Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:22:31.071680Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:22:31.072766Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:22:31.073588Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:22:31.201806Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:22:31.295276Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:22:31.300799Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:22:31.300823Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.306030Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:22:31.307510Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:22:31.319504Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:22:31.346949Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:31.346975Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:22:31.380424Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:22:31.407816Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:22:31.411929Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:22:31.413055Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:22:31.413069Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:22:31.415441Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:22:31.421706Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:22:31.421735Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.432626Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:22:31.433370Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:22:31.433380Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:22:31.434859Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:22:31.463822Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:22:31.463867Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.483122Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:22:31.492812Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:22:31.541898Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:22:31.575925Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:22:31.576639Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:31.576650Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.578155Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:31.600726Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:22:31.617133Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:22:31.617304Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:22:31.617333Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:31.617776Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:31.617789Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.620514Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:22:31.624508Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:22:31.633111Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:22:31.633538Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:31.633548Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.634578Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:22:31.640329Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:22:31.651460Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:22:31.652180Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:31.652189Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.653542Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:31.682572Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:22:31.683369Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:31.683382Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.684537Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:22:31.687341Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:22:31.690961Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:22:31.695330Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:22:31.700542Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:22:31.710868Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:22:31.711422Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:31.711432Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:31.712534Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:22:31.737055Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:31.737077Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:31.739069Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:31.765436Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:22:31.785646Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=46 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:22:31.792539Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:31.792558Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:22:31.806403Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:31.806425Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:31.808235Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:22:31.821901Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:31.821923Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:31.823128Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:22:31.826405Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:22:31.848016Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:31.848041Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:31.849320Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:31.864963Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:22:31.866067Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:22:31.866081Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:22:31.868687Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:22:31.885665Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:22:31.886538Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:22:31.886547Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:22:31.888170Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:22:31.939947Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:22:31.950792Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:22:31.961905Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:22:32.006612Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:22:32.006645Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.028403Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:22:32.073782Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:22:32.075071Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:22:32.075087Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.082722Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:22:32.401350Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:22:32.411731Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:22:32.411764Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.429495Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:22:32.559663Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:22:32.561637Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:22:32.603552Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:22:32.603582Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.623101Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:32.623138Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.641823Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:22:32.671795Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:22:32.697224Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:22:32.698872Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:22:32.698891Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.699952Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:22:32.700452Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:32.700463Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.701749Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:32.707977Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:22:32.723681Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:22:32.738334Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:22:32.738713Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:32.738723Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.740223Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:22:32.750068Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:22:32.750430Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:32.750439Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.751463Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:22:32.756628Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:22:32.767019Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:22:32.767533Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:32.767542Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:32.768761Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:32.973196Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:22:32.993325Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:22:33.007124Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:33.007149Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.016448Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:22:33.016471Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.044427Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:22:33.075001Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:33.182969Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=19 candidates=8748 ordinary_horizon=7565 paired_horizon=11978 use_paired=false
2026-09-11T21:22:33.238960Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:22:33.246291Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:33.246311Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.248233Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:22:33.248259Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:33.253780Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:33.264369Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:22:33.267452Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:22:33.268559Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:22:33.269388Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:22:33.270002Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:22:33.270810Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:22:33.319444Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:22:33.319472Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:33.326243Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:22:33.332136Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:33.332164Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:33.350703Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:22:33.351478Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:33.351517Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.352945Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:22:33.359436Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:22:33.359457Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.365242Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:22:33.380304Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:22:33.395098Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:33.417380Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:22:33.446674Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:33.446697Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.459540Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:22:33.459565Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.467741Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:22:33.470435Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:22:33.470469Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.483049Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:22:33.488160Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:22:33.513558Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:22:33.514255Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:33.514265Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.515868Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:22:33.528915Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:22:33.529516Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:33.529525Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.531005Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:22:33.580604Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:33.580641Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:33.583686Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:22:33.587387Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:33.594480Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:22:33.666459Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:22:33.695023Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:22:33.695060Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:33.711452Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:22:33.879590Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:22:33.888420Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:22:33.902390Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:22:33.902411Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.930556Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:22:33.950670Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:33.950700Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:33.958622Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:22:33.970795Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:22:33.990713Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:33.990737Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.000951Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:22:34.027830Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:22:34.029656Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:22:34.029674Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.037440Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:22:34.037460Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.038509Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:22:34.052026Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:34.054108Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:22:34.096311Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:22:34.097633Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:22:34.097647Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.106001Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:22:34.161143Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:22:34.161180Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:34.173659Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:22:34.231632Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:22:34.237102Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:34.237124Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.244140Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:34.253405Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:22:34.255492Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:22:34.256404Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:22:34.257029Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:22:34.263748Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:22:34.276197Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:22:34.276549Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:34.276555Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.278017Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:22:34.287303Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:22:34.287659Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:34.287666Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.288622Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:22:34.293765Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:22:34.297966Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:22:34.299866Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:22:34.304042Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:22:34.306634Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:22:34.308034Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:22:34.315538Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:22:34.321796Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:22:34.324136Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:22:34.329598Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:22:34.329978Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:34.329985Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.331643Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:34.342505Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:22:34.342902Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:34.342909Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.344040Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:34.349434Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:22:34.349455Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.358778Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:22:34.359374Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:34.359384Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.360647Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:34.368991Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:22:34.369285Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:34.369291Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.370269Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:22:34.377788Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:22:34.378068Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:34.378072Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.378540Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:22:34.378830Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:34.383883Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:34.383902Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.386847Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:22:34.407357Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:22:34.408815Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:22:34.414249Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:22:34.414274Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.420990Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:22:34.421009Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.428094Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:22:34.428121Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:34.438104Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:22:34.448123Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:22:34.469128Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:22:34.469161Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=14 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:34.479181Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:22:34.481061Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:22:34.481077Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.489888Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:22:34.594252Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:22:34.594289Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:34.598295Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=14 tile=159 row_words=1160 horizon=8593
2026-09-11T21:22:34.602913Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:22:34.611879Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:22:34.668253Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:22:34.669082Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:34.669095Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.670383Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:22:34.676669Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:22:34.680938Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:22:34.686047Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:22:34.768450Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:22:34.792486Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:22:34.792510Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:34.821239Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:22:34.947908Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:34.947951Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:34.968180Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:22:34.968227Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:34.994282Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:22:35.016065Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:22:35.016096Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:22:35.028847Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:35.028871Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.030454Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:22:35.042821Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:22:35.045702Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:35.045721Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.047214Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:22:35.057537Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:22:35.312776Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:22:35.341774Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:22:35.370952Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:35.370984Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:35.375705Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:22:35.375729Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:35.379900Z  INFO local_candidate{attempt=1}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:22:35.407743Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:22:35.414553Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:22:35.414580Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.425943Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:22:35.431867Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:22:35.432499Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:35.432509Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:35.433863Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:22:35.446426Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:22:35.446983Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:35.446991Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:35.448634Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:22:35.468502Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:22:35.494148Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:22:35.494173Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.500313Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:22:35.503473Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:22:35.503915Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:35.503922Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:35.505282Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:22:35.510990Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:22:35.521039Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:22:35.521060Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=13 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.522515Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=13 tile=53 row_words=38 horizon=6856
2026-09-11T21:22:35.527379Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:22:35.530271Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:22:35.530300Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.530655Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:22:35.534788Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:22:35.542118Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:22:35.562841Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:22:35.578675Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:22:35.578704Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.597113Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:22:35.597708Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:35.597735Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.599082Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:22:35.684921Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:22:35.684957Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.692437Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:22:35.860628Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:22:35.889437Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:22:35.889470Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:35.921391Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:22:35.939593Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:22:35.939634Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:35.946313Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:22:35.946890Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:35.946899Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:35.948385Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:22:36.050135Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:22:36.050171Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:36.059368Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:22:36.145193Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:22:36.168926Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:22:36.237392Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:22:36.237429Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:36.308232Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:22:36.308271Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:36.326119Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:22:36.333626Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:22:36.370124Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:22:36.370633Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:36.370643Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:36.372068Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:22:36.394833Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:22:36.394862Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=13 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:36.395986Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8137
2026-09-11T21:22:36.488628Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:22:36.488671Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:36.498723Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:22:36.519249Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:22:36.519285Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=14 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:36.649312Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=14 tile=79 row_words=1051 horizon=6343
2026-09-11T21:22:36.685534Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:22:36.751623Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:22:36.751659Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:36.849291Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:22:36.887955Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:22:36.888525Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:36.888567Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:36.890015Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:22:36.907280Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:22:36.907304Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=13 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:36.908931Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=13 tile=53 row_words=38 horizon=6856
2026-09-11T21:22:36.924944Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:22:36.995492Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:22:36.995527Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:37.047876Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:22:37.118459Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:22:37.151070Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:22:37.151113Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:37.173624Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:22:37.173666Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:37.184777Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:22:37.186287Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:22:37.186315Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:37.195391Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:22:37.219830Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:37.219861Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:37.221493Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:22:37.246546Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:22:37.248012Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:22:37.248029Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:37.251898Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:22:37.271971Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:22:37.272960Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:22:37.272976Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:37.275324Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:22:37.287894Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:22:37.292421Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:37.292450Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:37.294320Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:22:37.311246Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:22:37.311282Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=12 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:37.312817Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8137
2026-09-11T21:22:37.327645Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:22:37.328313Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:37.328323Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:37.329820Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:22:37.347383Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:22:37.347407Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=13 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:37.348996Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=13 tile=53 row_words=38 horizon=6280
2026-09-11T21:22:37.742316Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:22:37.742358Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:37.753471Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:22:37.753508Z  INFO local_candidate{attempt=1}: 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
2026-09-11T21:22:37.779168Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:22:37.847889Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:22:38.250391Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:22:38.250426Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:38.253721Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:22:38.253753Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:38.286807Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:22:38.308554Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:22:38.308581Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:38.327111Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:22:38.329934Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:22:38.339726Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:22:38.396042Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:22:38.397508Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:22:38.397526Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:38.400223Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:22:38.419372Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:22:38.420139Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:22:38.420148Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:38.422184Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:22:38.623833Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:22:38.690684Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:22:38.740048Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:22:38.740082Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:38.760633Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:22:38.790979Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:22:38.791011Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:38.815402Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:22:38.815441Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:38.854138Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:22:38.950894Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:22:38.973767Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:22:39.009468Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:22:39.010136Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:39.010149Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:39.011466Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:22:39.038991Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:22:39.039021Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:39.041797Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:22:39.062821Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:22:39.062847Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:39.064776Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:22:39.102023Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:22:39.193034Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:22:39.193092Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:39.255783Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:22:39.478033Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:22:39.478070Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:39.512672Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:22:39.549389Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:22:39.571152Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:22:39.571180Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:39.593189Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:22:39.630346Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:22:39.659428Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:22:39.664278Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:22:39.664298Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:39.668583Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:22:39.671642Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:22:39.671662Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:39.699134Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:22:40.269729Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:22:40.284445Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:22:40.284479Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:40.305796Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:22:40.305824Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:40.314711Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:22:40.325661Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:22:40.353748Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:22:40.353783Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=13 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:40.363052Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:22:40.363904Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:22:40.363917Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:40.370586Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:22:40.410076Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:22:40.410114Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:40.440725Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:22:40.470628Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:22:40.470665Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:40.493170Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=13 tile=159 row_words=1160 horizon=8593
2026-09-11T21:22:40.506596Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:22:40.628673Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:22:40.643970Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:22:40.654600Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:22:40.654625Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:40.670224Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:22:40.697292Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=14 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:22:40.697324Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=14 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:40.712831Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:22:40.712858Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:40.809408Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=14 tile=79 row_words=922 horizon=6894
2026-09-11T21:22:40.884518Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:22:40.978800Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=14 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:22:40.978848Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=14 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.059010Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:22:41.059050Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.060907Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:22:41.082159Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:22:41.088225Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:22:41.088247Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:41.092051Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=14 tile=154 row_words=925 horizon=6751
2026-09-11T21:22:41.119289Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:22:41.141620Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:22:41.142109Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:41.142117Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:41.143418Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:22:41.171384Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:22:41.171414Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.176872Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:22:41.196184Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:22:41.196958Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:41.196967Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:41.198789Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:22:41.226963Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:41.226992Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.228349Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:22:41.228383Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.228494Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:22:41.240122Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:41.240143Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.240921Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:22:41.265229Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=62 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:22:41.280397Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=64 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:22:41.280837Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:22:41.296651Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:41.296671Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.298407Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:41.312730Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:41.312749Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.313420Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:41.313443Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.313705Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:41.314712Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:22:41.323488Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:22:41.323529Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.333574Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:41.333594Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.334831Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:41.334894Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:41.334912Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.336318Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:41.344240Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:41.344261Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.345215Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:22:41.389677Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:41.389721Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.391133Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:41.409046Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=70 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:22:41.474097Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:22:41.474139Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=14 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.498376Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:22:41.540416Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:22:41.568248Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:41.568276Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:41.573497Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=56 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:22:41.602104Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:22:41.606231Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=14 tile=159 row_words=1160 horizon=8593
2026-09-11T21:22:41.624248Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:22:41.624724Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:41.624731Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:41.626102Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:22:41.627437Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:22:41.637578Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:22:41.638000Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:41.638007Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:41.639332Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:22:41.649384Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:22:41.649407Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:41.671172Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:22:41.682431Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:22:41.692057Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:22:41.840471Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:41.840508Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.851224Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:41.878947Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:41.878977Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.881426Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:41.925971Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=45 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:22:41.945976Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:41.946001Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:41.948115Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:22:42.067873Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=40 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:22:42.103766Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:42.103804Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.115355Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:42.139091Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:42.139119Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.140827Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:42.154720Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:42.154742Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.155808Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:22:42.212983Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:22:42.213156Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:22:42.213182Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=28 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.218522Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:22:42.218540Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:42.222985Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:22:42.226919Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=28 tile=136 row_words=181 horizon=8747
2026-09-11T21:22:42.308683Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:42.308720Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.338780Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:42.459278Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:22:42.459325Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.474608Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:22:42.500868Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:22:42.500900Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.518132Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:22:42.560566Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:42.560601Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.596277Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:22:42.596309Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.605596Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:22:42.609748Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:22:42.609779Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=29 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.617471Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=14502
2026-09-11T21:22:42.620848Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:22:42.620884Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.658009Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:22:42.820042Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:42.820080Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.849128Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:22:42.855030Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:22:42.855063Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:42.883183Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:22:42.883218Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:42.888595Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:22:42.888783Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:42.896530Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:22:42.931368Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:22:42.932300Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:22:42.932314Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:42.938723Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:22:43.023051Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:22:43.096159Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:22:43.160827Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:22:43.160859Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:43.208908Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:22:43.215043Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:22:43.225096Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:22:43.225115Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:43.242773Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:22:43.374866Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:22:43.378271Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:22:43.378302Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:43.396952Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:22:43.396971Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:43.417731Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:22:43.456622Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:22:43.702954Z  INFO local_candidate{attempt=1}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:43.702992Z  INFO local_candidate{attempt=1}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:43.750533Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:22:43.750571Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:43.813146Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:22:43.885663Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=25 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:22:43.885692Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=25 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:43.887757Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=25 tile=723 row_words=30 horizon=2545
2026-09-11T21:22:43.905768Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:22:43.973618Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:22:43.973649Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.024403Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:22:44.100194Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:22:44.104115Z  INFO local_candidate{attempt=1}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:22:44.128597Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:44.128616Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.161930Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:22:44.180372Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:22:44.180401Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:44.182512Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:22:44.182958Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:44.182970Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.184319Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:22:44.189567Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:22:44.208348Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:22:44.208369Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:44.211140Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:22:44.230358Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:22:44.230379Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=32 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:44.232419Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=5448
2026-09-11T21:22:44.246930Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:22:44.246974Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:44.324242Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:22:44.324274Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:44.333793Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:22:44.347732Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:22:44.387999Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:22:44.389399Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:22:44.389415Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.392188Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:22:44.410887Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:22:44.411663Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:22:44.411674Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.413881Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:22:44.695673Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:22:44.716722Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:22:44.716746Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.740836Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:22:44.761008Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:22:44.761498Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:44.761507Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.762771Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:22:44.775272Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:44.775287Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:44.776644Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:44.863375Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:22:44.904572Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:22:44.904601Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.929967Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:22:44.938006Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:22:44.965551Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:22:44.965578Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:44.999928Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:22:45.027978Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:22:45.028013Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:45.060232Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:22:45.060264Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:45.071154Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=36 tile=1095 row_words=136 horizon=822
2026-09-11T21:22:45.095584Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:22:45.095615Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:45.100983Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:22:45.126539Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:22:45.392906Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:22:45.392942Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=35 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:45.474310Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14348
2026-09-11T21:22:46.003378Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:22:46.009918Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:22:46.009952Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:46.086900Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:22:46.086932Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:46.159577Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:22:46.159616Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:46.193610Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:22:46.205497Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:22:46.236976Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:22:47.278369Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:22:47.278407Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=36 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:47.354680Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=36 tile=707 row_words=445 horizon=14301
2026-09-11T21:22:47.762833Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:22:47.762878Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:47.924275Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:22:50.663619Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:50.663655Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:50.886917Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:50.886951Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:51.044578Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:22:51.163363Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=38 success=true
2026-09-11T21:22:51.167115Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:22:51.173778Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:22:51.289704Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:22:51.325059Z  INFO local_candidate{attempt=4}: exchange table and repeat patch storage exchange_table_bytes=38968 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:22:51.849384Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:22:51.877004Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:22:51.877029Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:51.906078Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:22:52.011935Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:52.011970Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:52.432997Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:22:52.557706Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=31 success=true
2026-09-11T21:22:52.561490Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:22:52.569088Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:22:52.578020Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=48 success=true
2026-09-11T21:22:52.583239Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=5 success=true
2026-09-11T21:22:52.592305Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:22:52.729338Z  INFO local_candidate{attempt=5}: exchange table and repeat patch storage exchange_table_bytes=38936 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:22:52.790602Z  INFO local_candidate{attempt=1}: exchange table and repeat patch storage exchange_table_bytes=40216 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:22:53.040312Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=140 success=true
2026-09-11T21:22:53.040349Z  INFO local_candidate{attempt=4}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16368 exchange_table_bytes=38968 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:22:53.040363Z  INFO local_candidate{attempt=4}: allocated package support memory linked_end=386240 profile_bytes=1068 exchange_table_bytes=38968 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16368 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525356, 949168)]
2026-09-11T21:22:53.519524Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=479 success=true
2026-09-11T21:22:53.540198Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:22:53.541352Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:53.541376Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.541894Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:22:53.541929Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:22:53.542832Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:53.542852Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.542933Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:22:53.542946Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:22:53.543627Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:53.545378Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:22:53.545920Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:22:53.549054Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:22:53.550164Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:22:53.550188Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:22:53.552814Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:22:53.564024Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:22:53.564727Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:53.564741Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.566760Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:22:53.571364Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:22:53.572912Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:53.572930Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.575406Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:53.576438Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:22:53.584744Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:22:53.586940Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:22:53.587865Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:22:53.587870Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:22:53.589863Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:22:53.589890Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:22:53.589906Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.590472Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:53.590484Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.592417Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:22:53.599725Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:22:53.600286Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:22:53.601316Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:22:53.603016Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:22:53.606689Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:22:53.607295Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:22:53.607807Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:53.607818Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.609483Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:53.613495Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:22:53.622844Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:22:53.623993Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:22:53.624626Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:22:53.633472Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:22:53.633492Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.634977Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:22:53.635684Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:53.635699Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:53.638800Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:53.641931Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:22:53.791086Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:53.802099Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:53.802126Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:22:53.805953Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:22:53.805984Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:53.815772Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:53.828499Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:22:53.998113Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:22:53.998144Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:54.007378Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=14502
2026-09-11T21:22:54.042320Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:22:54.043735Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:22:54.043752Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.047344Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:22:54.070280Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:22:54.071181Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:22:54.071192Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.073783Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=5448
2026-09-11T21:22:54.081871Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:22:54.082609Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:22:54.086740Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:22:54.092599Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:22:54.105145Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:22:54.105668Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:54.105679Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.107229Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:22:54.116557Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:22:54.116579Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.163140Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:22:54.258946Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:22:54.288966Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:54.289001Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.289880Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:22:54.305471Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:54.341148Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:22:54.342534Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:54.342553Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.345898Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:54.363114Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:22:54.363145Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.423478Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:22:54.497910Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:22:54.536317Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:22:54.536341Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.555946Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:22:54.599039Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:22:54.600340Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:22:54.600357Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.607900Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:22:54.686067Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:22:54.722519Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:54.722548Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:22:54.764168Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:22:54.915497Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:22:54.929831Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:22:54.929853Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:54.947417Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:22:55.119772Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:22:55.160653Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:22:55.160684Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:55.186612Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:22:55.266194Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:22:55.295984Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:22:55.296021Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:55.296192Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:22:55.329218Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=136 horizon=822
2026-09-11T21:22:55.330633Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:55.330658Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:55.352712Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:22:55.353248Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:55.353257Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:55.354620Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:55.366878Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:22:55.367329Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:55.367339Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:55.368990Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:22:55.376612Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:55.392098Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:22:55.392125Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:55.393555Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8139
2026-09-11T21:22:55.532755Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:22:55.533157Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:55.533169Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:55.534329Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:22:55.539847Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:22:55.550187Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:22:55.550732Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:55.550741Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:55.551879Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:55.732823Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:22:55.747026Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:22:55.747051Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:55.772092Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:22:55.784043Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1443 success=true
2026-09-11T21:22:55.784078Z  INFO local_candidate{attempt=1}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9084 generated_code_bytes=16492 exchange_table_bytes=40216 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395392, 524288)]
2026-09-11T21:22:55.784104Z  INFO local_candidate{attempt=1}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=40216 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=16492 code_address=395392 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:22:55.962360Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:22:55.997099Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:55.997134Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.034837Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:22:56.061941Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:22:56.062640Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:56.062651Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.064226Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:22:56.129672Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:22:56.132268Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:22:56.132286Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.135265Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=723 row_words=30 horizon=2545
2026-09-11T21:22:56.144572Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:22:56.183154Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:22:56.240005Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:56.240029Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.257973Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1453 success=true
2026-09-11T21:22:56.258018Z  INFO local_candidate{attempt=5}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16480 exchange_table_bytes=38936 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:22:56.258036Z  INFO local_candidate{attempt=5}: allocated package support memory linked_end=386240 profile_bytes=1080 exchange_table_bytes=38936 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16480 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525368, 949168)]
2026-09-11T21:22:56.259048Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:22:56.352609Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:22:56.352643Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:56.391375Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:22:56.415767Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:22:56.429653Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:22:56.430348Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:56.430362Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.432460Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:56.437185Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:22:56.437224Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.447804Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:22:56.460745Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:22:56.468138Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:22:56.468755Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:56.468766Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.470762Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:22:56.471714Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:22:56.474612Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:22:56.475053Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:22:56.475607Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:22:56.482185Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:22:56.638739Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:22:56.647015Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:56.647045Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.655416Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:56.792339Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:22:56.826478Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:56.826500Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.887114Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:56.889767Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1105 success=true
2026-09-11T21:22:56.892679Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=634 success=true
2026-09-11T21:22:56.903330Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:22:56.909661Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:22:56.910157Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:56.910168Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.911337Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:56.912841Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:22:56.913971Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:56.913987Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.916528Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:56.917794Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:22:56.918344Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:56.918356Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.920434Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:22:56.927031Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:22:56.927650Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:56.927662Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.929013Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:56.931632Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:22:56.932071Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:56.932080Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.933219Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:22:56.937175Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:22:56.937486Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:56.937492Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.938510Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:22:56.938817Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:22:56.943971Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:22:56.945974Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:22:56.946327Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:22:56.946619Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:56.946625Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.947421Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:56.953255Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:22:56.954387Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:22:56.955567Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:22:56.961816Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:22:56.975289Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:22:56.975808Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:56.975818Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.977650Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:56.989489Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:22:56.989945Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:56.989953Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:56.991248Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:22:57.005777Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:22:57.022983Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:22:57.045288Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:22:57.056368Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:22:57.112921Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:22:57.121778Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:22:57.164762Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:22:57.164793Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.169587Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:22:57.169619Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:57.201420Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:22:57.201456Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.214291Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=265 horizon=14267
2026-09-11T21:22:57.233827Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:22:57.243708Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:22:57.256400Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:22:57.256835Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:57.256844Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.258582Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:22:57.263745Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:22:57.264190Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:57.264198Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.266250Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:22:57.268636Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:22:57.269008Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:57.269021Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.270089Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:22:57.275417Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:22:57.276484Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:22:57.276852Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:57.276860Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.277956Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:22:57.280246Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:22:57.282062Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:22:57.283495Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:22:57.289279Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:22:57.290306Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:22:57.294103Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:22:57.294634Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:57.294642Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.295849Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:57.298711Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:22:57.314327Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:22:57.314748Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:22:57.314756Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.315481Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:22:57.317163Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:22:57.330934Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:22:57.331576Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:22:57.331593Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.333369Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:22:57.351769Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:22:57.352459Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:22:57.352472Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.354217Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:22:57.361410Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:22:57.362366Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:57.362380Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.363244Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:22:57.363556Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:22:57.363561Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.364596Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:57.364733Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:22:57.373431Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:22:57.373730Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:22:57.373735Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.374678Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:22:57.383321Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:22:57.407668Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:22:57.429817Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:57.429852Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.436522Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:22:57.441838Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:57.454184Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:22:57.458109Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:22:57.461542Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:22:57.461562Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.462904Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:22:57.473696Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:22:57.474123Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:22:57.474131Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.474819Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:22:57.475711Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:22:57.485839Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:22:57.486248Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:22:57.486258Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.487179Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:22:57.492391Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:22:57.504568Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:22:57.505410Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:22:57.505785Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:57.505805Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.506299Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:22:57.506318Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.507836Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:22:57.508678Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:22:57.759703Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:22:57.759742Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=35 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:57.798580Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:22:57.855926Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:57.880021Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:22:57.907687Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:57.907722Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.923820Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:22:57.923850Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:57.923824Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:57.956113Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:22:57.956138Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.000129Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:22:58.011582Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:22:58.025660Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:58.025683Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.034100Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:22:58.057094Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:58.080612Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:22:58.080645Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:58.097095Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:22:58.142956Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:22:58.143681Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:58.143696Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.145472Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:58.148477Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:22:58.148501Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.168805Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:22:58.169840Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=447 horizon=14529
2026-09-11T21:22:58.183232Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:22:58.183719Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:58.183733Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.185003Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:22:58.185727Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:22:58.187623Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:22:58.188856Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:22:58.189659Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:22:58.211463Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:22:58.213884Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:22:58.213903Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.214640Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:22:58.216323Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:22:58.220784Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:58.220807Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.221887Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:22:58.228024Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:58.231834Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=35 tile=109 row_words=1528 horizon=14869
2026-09-11T21:22:58.238222Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:22:58.246791Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:22:58.271595Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:22:58.272180Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:58.272188Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.273789Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:22:58.286078Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:22:58.291571Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:22:58.291587Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.295906Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:22:58.296637Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:22:58.328779Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:58.335568Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:22:58.337409Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:22:58.338410Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:22:58.342498Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:22:58.344346Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:22:58.344363Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.345003Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:58.345020Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.351141Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:22:58.351644Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:22:58.352310Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:22:58.352321Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.353908Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:22:58.353987Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:22:58.360677Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:58.379400Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:22:58.379821Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:58.379829Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.380973Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:22:58.381934Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:22:58.388508Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:22:58.388528Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.391321Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:22:58.391689Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:58.391695Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.392853Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:22:58.396038Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:22:58.406790Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:22:58.430341Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:22:58.431107Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:22:58.431489Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:22:58.431502Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:22:58.431672Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:22:58.433098Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:22:58.433115Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.434296Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:22:58.439848Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:22:58.440877Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:22:58.451542Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:22:58.452360Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:22:58.452371Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:22:58.454145Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:22:58.503844Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:22:58.514630Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:22:58.534007Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:22:58.545128Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:58.574615Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:58.574651Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.592253Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:58.592286Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.608601Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:58.609345Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:22:58.615014Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:22:58.615043Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:58.633667Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:22:58.635434Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:58.653492Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:22:58.653524Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.657123Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:22:58.671779Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:22:58.685429Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:22:58.685448Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.697811Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:22:58.718635Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:22:58.727187Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:22:58.727235Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.735296Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:22:58.735328Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:58.751716Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:22:58.764627Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:22:58.764647Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.781450Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:22:58.790666Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:22:58.793314Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:22:58.793344Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:58.801702Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:22:58.871021Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=149 row_words=1113 horizon=8617
2026-09-11T21:22:58.917266Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:22:58.918482Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:22:58.918497Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.920986Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:22:58.928975Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:22:58.929002Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:22:58.936810Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=139 row_words=185 horizon=10717
2026-09-11T21:22:58.938300Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:22:58.938969Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:22:58.938980Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:58.940818Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:22:59.019138Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:22:59.024787Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:59.044502Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:59.044527Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:59.061497Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:59.063574Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:22:59.063607Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:59.088337Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:22:59.107120Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:22:59.117480Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:22:59.118183Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:22:59.118192Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:59.120211Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:22:59.125350Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:22:59.125377Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:59.137559Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:22:59.138433Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:22:59.138446Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:59.140290Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=53 row_words=38 horizon=6856
2026-09-11T21:22:59.141714Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:22:59.166546Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:59.175524Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:59.175546Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:22:59.187227Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:59.286610Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:22:59.294685Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:22:59.294708Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:22:59.306685Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:22:59.872510Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:22:59.888963Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:22:59.907437Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:22:59.907475Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:59.946052Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:22:59.951983Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:22:59.954950Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:22:59.954979Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:22:59.978962Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:22:59.978984Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:00.010841Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:23:00.034418Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:23:00.037586Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:23:00.038106Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:00.038114Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:00.039485Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:23:00.068944Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:23:00.129748Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:23:00.129777Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:00.130802Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:23:00.174696Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:23:00.174726Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:00.200437Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:23:00.201393Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:23:00.204991Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:23:00.236342Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:23:00.237238Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:23:00.237253Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:23:00.237855Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:00.237878Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:23:00.239966Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:23:00.256301Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:23:00.256998Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:23:00.257008Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:23:00.258793Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:23:00.259627Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:23:00.282393Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:23:00.290528Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:00.290553Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:23:00.307238Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:23:00.311005Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:23:00.311642Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:00.311655Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:00.313466Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:23:00.318126Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:23:00.327543Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:23:00.340288Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:23:00.340317Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:00.342079Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8139
2026-09-11T21:23:00.359960Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:23:00.387755Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:23:00.387779Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:23:00.421440Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:23:00.657672Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:23:00.693806Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:23:00.693830Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:00.709188Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:23:00.748196Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:23:00.749288Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:23:00.749302Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:00.756502Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:23:00.964870Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:23:00.964909Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:00.996104Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:23:01.038010Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:23:01.044465Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:23:01.050023Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:23:01.050042Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:01.065477Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:23:01.109086Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:01.109123Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:01.132396Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:23:01.264271Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:23:01.314865Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:23:01.314889Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:01.354716Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:23:01.376090Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:23:01.434385Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:23:01.434409Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:01.439737Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=1051 horizon=6343
2026-09-11T21:23:01.489046Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:23:01.489083Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:01.537963Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:23:01.634369Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:23:01.639524Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:23:01.639566Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:01.644747Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:23:01.691946Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:23:01.875928Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:23:01.875969Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:01.894707Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:23:01.935460Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:23:01.957462Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:23:01.957484Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:01.958582Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:23:01.961882Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:23:01.979943Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:23:01.987150Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:01.987171Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.022003Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:23:02.036831Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:23:02.036856Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:02.044146Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:23:02.044631Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:02.044639Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.044897Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:23:02.045895Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:23:02.057013Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:23:02.057436Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:02.057450Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.058834Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:23:02.078141Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:23:02.078178Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.102162Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:23:02.111781Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:23:02.283625Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:23:02.316979Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:23:02.385154Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:23:02.385189Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.444934Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:23:02.517594Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:23:02.517636Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:02.552325Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:23:02.580955Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:23:02.581485Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:02.581495Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.582746Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:23:02.604122Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:23:02.605064Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:23:02.605078Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.608040Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:23:02.624638Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:23:02.625313Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:23:02.625325Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.625799Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:23:02.625821Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:02.627054Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:23:02.634741Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:23:02.734841Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:23:02.764907Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:23:02.764947Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:02.765236Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:23:02.805542Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:23:02.805578Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.816510Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:23:02.838404Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:23:02.838434Z  INFO local_candidate{attempt=1}: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
2026-09-11T21:23:02.840264Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:23:02.840287Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:02.850320Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=712 row_words=446 horizon=14529
2026-09-11T21:23:02.864797Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:23:02.866465Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:23:02.936595Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:23:03.108457Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:23:03.108500Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:03.108731Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:23:03.108760Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:03.140835Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:23:03.142918Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=265 horizon=14267
2026-09-11T21:23:03.212081Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:23:03.245265Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:23:03.250499Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:23:03.250520Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:03.272391Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:23:03.272419Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:03.278419Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:23:03.302877Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:23:05.604543Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:23:05.604582Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:05.659882Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:23:05.659916Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:05.737775Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=149 row_words=1113 horizon=8617
2026-09-11T21:23:05.743520Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:23:05.760890Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:23:05.760923Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:05.867194Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:23:05.966902Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:23:05.966928Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:06.140088Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:23:06.186583Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=162 row_words=1526 horizon=14751
2026-09-11T21:23:07.591507Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:23:07.718051Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:23:07.718088Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:07.767901Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:23:09.349102Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:23:09.450974Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:23:09.451006Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:09.612127Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:23:10.375822Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:23:10.375859Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:10.744538Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=109 row_words=1526 horizon=14755
2026-09-11T21:23:13.214498Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:23:13.214535Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.499437Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:23:13.566126Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=16676 success=true
2026-09-11T21:23:13.569518Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=20049 success=true
2026-09-11T21:23:13.575819Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=16683 success=true
2026-09-11T21:23:13.604842Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=33 success=true
2026-09-11T21:23:13.605586Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=39 success=true
2026-09-11T21:23:13.607065Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=38 success=true
2026-09-11T21:23:13.608022Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:23:13.608756Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:23:13.613182Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=6 success=true
2026-09-11T21:23:13.614006Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:23:13.614437Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:23:13.621082Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:23:13.726431Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:13.726458Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.726564Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:13.726583Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.727349Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=57 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:23:13.727795Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:23:13.728386Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:23:13.732913Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:13.732941Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.735519Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:23:13.739736Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:13.739749Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.740801Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:23:13.741836Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:13.741856Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.743598Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:23:13.753388Z  INFO local_candidate{attempt=6}: exchange table and repeat patch storage exchange_table_bytes=38432 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:23:13.754268Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:13.754280Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.755186Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:23:13.757721Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:23:13.757737Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.759027Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:23:13.760762Z  INFO local_candidate{attempt=2}: exchange table and repeat patch storage exchange_table_bytes=39392 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:23:13.768169Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:23:13.769603Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:23:13.769615Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:13.777744Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:23:13.778780Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=63 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:23:13.785135Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:23:13.791119Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:23:13.791134Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:13.792890Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=65 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:23:13.796321Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:23:13.805297Z  INFO local_candidate{attempt=7}: exchange table and repeat patch storage exchange_table_bytes=38296 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:23:13.807454Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:23:13.807490Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.809129Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:23:13.821244Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:23:13.821653Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:23:13.821664Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.822310Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:23:13.822322Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:23:13.822660Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:23:13.824984Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:23:13.841142Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:23:13.841159Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.842469Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:23:13.842614Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:23:13.843287Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:23:13.843299Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:23:13.845071Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:23:13.850320Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:23:13.850345Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.850665Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:23:13.850676Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.851723Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:23:13.867772Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:23:13.892274Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:23:13.892292Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.893053Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:23:13.898369Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:23:13.906993Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=71 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:23:13.908468Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:23:13.947609Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:23:13.947631Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:13.954198Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:23:14.031537Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:23:14.052488Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:23:14.052519Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:14.056137Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:23:14.056156Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:14.068082Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:23:14.076510Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:23:14.076537Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:14.082305Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:23:14.085102Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:23:14.327845Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:23:14.334576Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:23:14.334596Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:23:14.345158Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:23:14.598556Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=41 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:23:14.635340Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:14.635372Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:14.646508Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:23:14.671137Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:14.671161Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:14.673278Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:23:15.113925Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:23:15.113965Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:15.174979Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:23:15.180499Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:23:15.207060Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:15.207084Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:23:15.240175Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:23:15.327794Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:23:15.327832Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:15.336280Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:23:15.336306Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:15.342463Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:23:15.353448Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:23:15.356374Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:23:15.368929Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:15.368947Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:15.370299Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:23:15.397602Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:23:15.397635Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:15.422495Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:23:15.615683Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=20 candidates=6660 ordinary_horizon=7298 paired_horizon=13815 use_paired=false
2026-09-11T21:23:15.676160Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=20 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:23:15.676185Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=20 initial_horizon=7298 selected_horizon=7298 endpoint_lower_bound=4656 lower_bound_gap=2642 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:15.704994Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=20 tile=13 row_words=347 horizon=7298
2026-09-11T21:23:15.845838Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:23:15.864489Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:23:15.864509Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:15.881065Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:23:15.901932Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:15.901953Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:15.903427Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:23:15.940019Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=46 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:23:15.969011Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:23:15.969775Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:15.969787Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:15.971405Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:23:15.995058Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:23:15.995077Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=13 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:15.996592Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8137
2026-09-11T21:23:16.080435Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:23:16.080464Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:16.081645Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:23:16.192199Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:23:16.259600Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:23:16.259633Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:16.281187Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:23:16.281234Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:16.283464Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:23:16.299416Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:23:16.299431Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:16.300963Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:23:16.311846Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:16.311859Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:16.312897Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:23:16.351415Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:23:16.372419Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:23:16.437733Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:16.437757Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:16.466808Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:23:16.534030Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:23:16.553870Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:23:16.553899Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:16.573119Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:23:16.582752Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1259 success=true
2026-09-11T21:23:16.582832Z  INFO local_candidate{attempt=6}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16528 exchange_table_bytes=38432 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:23:16.583146Z  INFO local_candidate{attempt=6}: allocated package support memory linked_end=386240 profile_bytes=1080 exchange_table_bytes=38432 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16528 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525368, 949168)]
2026-09-11T21:23:16.917816Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:23:16.917852Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:16.943754Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:23:17.144362Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=561 success=true
2026-09-11T21:23:17.157587Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:23:17.157619Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=16 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:17.161404Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:23:17.162134Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:17.162144Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.163756Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:23:17.165096Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:23:17.165121Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:17.186821Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=16 tile=964 row_words=285 horizon=7135
2026-09-11T21:23:17.206244Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:23:17.212087Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:23:17.212106Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.212979Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:23:17.213594Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:17.213602Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.214868Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:23:17.215378Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:23:17.216904Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:23:17.225654Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:23:17.226072Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:23:17.226565Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:17.226574Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.227830Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:23:17.232718Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:23:17.265432Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:23:17.274479Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:23:17.279149Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:23:17.279615Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:17.279628Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.281617Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:23:17.283819Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:23:17.291912Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:23:17.292317Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:17.292327Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.293501Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:23:17.299268Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:23:17.304610Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:23:17.306537Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:23:17.314187Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:23:17.315249Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:23:17.322684Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:23:17.336850Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:23:17.337576Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:23:17.337593Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.339530Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:23:17.351419Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:23:17.351846Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:23:17.351857Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.353083Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:23:17.368322Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:23:17.368928Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:23:17.368939Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.370512Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:23:17.378558Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:23:17.378837Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:23:17.378844Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.379324Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:23:17.379352Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:17.380198Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:23:17.388041Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:23:17.388349Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:23:17.388356Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.389349Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:23:17.396224Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:23:17.397298Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:23:17.533279Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:23:17.533314Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:17.542776Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:23:17.550231Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:23:17.550263Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:17.570241Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:23:17.571558Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:23:17.590639Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:17.590655Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.600193Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:23:17.619571Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:23:17.620266Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:17.620278Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.621840Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:23:17.623885Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:23:17.625084Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:23:17.625097Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.633387Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:23:17.697335Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:23:17.766111Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:23:17.766167Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.785404Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:23:17.785453Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:17.794264Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=139 row_words=185 horizon=10717
2026-09-11T21:23:17.806970Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:23:17.821415Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:23:17.843468Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:23:17.843490Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.858482Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:23:17.896793Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:23:17.897856Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:23:17.897874Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.903870Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:23:17.904771Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:23:17.928879Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:23:17.928899Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:17.952254Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:23:17.952287Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=17 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:17.957152Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:23:17.983312Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=17 tile=79 row_words=268 horizon=13126
2026-09-11T21:23:18.109919Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:23:18.109959Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:18.161272Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:23:18.177506Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:23:18.183732Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:23:18.183751Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:18.184799Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:23:18.189672Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:23:18.189689Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:18.204335Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=2879 success=true
2026-09-11T21:23:18.204356Z  INFO local_candidate{attempt=7}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16528 exchange_table_bytes=38296 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:23:18.204380Z  INFO local_candidate{attempt=7}: allocated package support memory linked_end=386240 profile_bytes=1080 exchange_table_bytes=38296 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16528 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525368, 949168)]
2026-09-11T21:23:18.204794Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:23:18.211333Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:23:18.415215Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:23:18.415253Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:18.604457Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:23:18.668451Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:23:18.669499Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:23:18.669520Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:23:18.671780Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:23:18.686606Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:23:18.687244Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:23:18.687256Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:23:18.688775Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:23:18.734297Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:23:18.743174Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:23:19.047685Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:23:19.060028Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:23:19.060063Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=14 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:19.083502Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:19.083527Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.083714Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:23:19.083739Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:19.116979Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=912 success=true
2026-09-11T21:23:19.131903Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:23:19.152573Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:23:19.153269Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:23:19.157542Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:23:19.163873Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:23:19.191085Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=14 tile=159 row_words=1160 horizon=8593
2026-09-11T21:23:19.192383Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:23:19.192409Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.216129Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:23:19.252306Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:23:19.315416Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:23:19.316074Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:19.316086Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.318251Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:23:19.330955Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:23:19.331432Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:19.331442Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.332557Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:23:19.338779Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:23:19.350101Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:23:19.350655Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:23:19.350667Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.351978Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:23:19.382285Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:23:19.389664Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:23:19.389683Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:23:19.401709Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:23:19.502163Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:23:19.503060Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:19.503076Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.504769Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:23:19.528391Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:23:19.698752Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:23:19.699392Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:23:19.699405Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.700665Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:23:19.708306Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:23:19.733584Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:23:19.755887Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:23:19.755912Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.775440Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:23:19.775461Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.791305Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:23:19.820285Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:23:19.850215Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:23:19.850791Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:19.850801Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.852310Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:23:19.867476Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:23:19.868223Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:23:19.868235Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:19.869765Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=53 row_words=38 horizon=6280
2026-09-11T21:23:20.066705Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:23:20.134606Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:23:20.134640Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.228885Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:23:20.259872Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:23:20.266581Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:23:20.267080Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:20.267088Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.268668Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:23:20.280842Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:23:20.289744Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:20.289771Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:23:20.306469Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:23:20.306491Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.315105Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:23:20.324097Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:23:20.324687Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:23:20.325603Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:23:20.646442Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:23:20.684365Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:23:20.684396Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.690542Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:23:20.712867Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:20.712896Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.723839Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:23:20.745758Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:23:20.746031Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:23:20.746443Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:20.746456Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.748052Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:23:20.763255Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:23:20.801398Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:23:20.807303Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:23:20.807328Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.822115Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:23:20.822136Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.823622Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:23:20.842475Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:23:20.906232Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:23:20.911633Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:23:20.911653Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.913621Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:23:20.918497Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:23:20.918744Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:23:20.918761Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.923586Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:23:20.928526Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:23:20.930740Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:23:20.931702Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:23:20.932398Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:23:20.972959Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:23:20.974647Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:23:20.974664Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:20.982997Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:23:21.164124Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:23:21.216988Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:23:21.223890Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:21.223912Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.233304Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:23:21.247476Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:23:21.253878Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:23:21.253900Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.269087Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:23:21.276783Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:23:21.286320Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:23:21.287367Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:23:21.287382Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.289902Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:23:21.303427Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:23:21.303445Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.306446Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:23:21.307052Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:23:21.307061Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.308799Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:23:21.320493Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:23:21.320513Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.329046Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:23:21.329843Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:23:21.329855Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:23:21.332123Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:23:21.335668Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:23:21.335745Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:23:21.347383Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:23:21.347987Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:23:21.347997Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:23:21.349559Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:23:21.359848Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:23:21.359873Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.390677Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:23:21.395890Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:23:21.405097Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:23:21.481893Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:23:21.489163Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:23:21.489180Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:23:21.489387Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:23:21.500188Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:23:21.525461Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:23:21.530590Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:23:21.561173Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:23:21.561214Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.569483Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:23:21.569517Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:21.577897Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:23:21.600403Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:23:21.617640Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:23:21.618867Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:23:21.618881Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.625736Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:23:21.625808Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:23:21.638572Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:23:21.639026Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:21.639034Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.640758Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:23:21.646526Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:23:21.646547Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.650829Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:23:21.651213Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:21.651223Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.652247Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:23:21.657411Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:23:21.662325Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:23:21.664131Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:23:21.671577Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:23:21.672573Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:23:21.680159Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:23:21.693305Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:23:21.693776Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:23:21.693785Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.695471Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:23:21.706267Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:23:21.706720Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:23:21.706729Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.707785Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:23:21.722594Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:23:21.723374Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:23:21.723385Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.724692Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:23:21.732500Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:23:21.732828Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:23:21.732833Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.733937Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:23:21.741331Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:23:21.741611Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:23:21.741616Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.742359Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:23:21.749645Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:23:21.838477Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:23:21.894932Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:23:21.895581Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:21.895594Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.897349Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:23:21.907763Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:23:21.908238Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:21.908249Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.909300Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:23:21.911631Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:23:21.914747Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:23:21.922615Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:23:21.922632Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.924620Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:23:21.925122Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:23:21.925132Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:21.926216Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:23:21.938144Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:23:21.962702Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:23:21.962743Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:22.039733Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:23:22.045135Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=712 row_words=446 horizon=14529
2026-09-11T21:23:22.081169Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:23:22.085361Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:23:22.090463Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:23:22.095467Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:23:22.103231Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:23:22.103777Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:22.103784Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.105410Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:23:22.107296Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:23:22.107319Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.128137Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:23:22.153717Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:23:22.153739Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.158475Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:23:22.190749Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:23:22.191357Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:23:22.191370Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.192577Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:23:22.250546Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=154 row_words=925 horizon=6751
2026-09-11T21:23:22.308856Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:23:22.332849Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:23:22.332871Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.367273Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:23:22.390366Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:23:22.390845Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:22.390854Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.392216Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:23:22.475268Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:23:22.475302Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:22.491461Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:23:22.558318Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:23:22.558363Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:22.601675Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=265 horizon=14267
2026-09-11T21:23:22.614041Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:23:22.614073Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:22.620886Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:23:22.637735Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:23:22.638514Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:22.638528Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.640622Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:23:22.644578Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:23:22.645495Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:23:22.645508Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.647870Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:23:22.660753Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:23:22.662018Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:23:22.662038Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.664471Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=53 row_words=38 horizon=6856
2026-09-11T21:23:22.664592Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:23:22.665298Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:23:22.665311Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.667248Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:23:22.684407Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:23:22.685397Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:22.685410Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.687034Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:23:22.699956Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:23:22.700980Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:22.700991Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.702711Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:23:22.750127Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:23:22.760340Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:23:22.803272Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:23:22.809190Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:23:22.809225Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.815594Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:23:22.824608Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:23:22.826723Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:23:22.826737Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:23:22.827651Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:23:22.828305Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:23:22.856196Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:22.856234Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:22.895993Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:23:23.077859Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:23:23.130125Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:23:23.130150Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:23.157386Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:23:23.188874Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:23:23.188900Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:23.199553Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:23:23.250674Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:23:23.273739Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:23:23.274216Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:23.274249Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:23.275536Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:23:23.327496Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:23:23.327540Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:23.339595Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=139 row_words=185 horizon=10717
2026-09-11T21:23:23.661438Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:23:23.661522Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:23:23.689975Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:23:23.690008Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:23.700057Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:23:23.700104Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:23.725376Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:23:23.726164Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:23:23.726586Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:23:23.746109Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:23:23.768712Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:23:23.768746Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:23.791479Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:23:23.810757Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:23:23.810790Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:23.893024Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:23:23.908860Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:23:23.954240Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:23.954273Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:23.977068Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:23:24.145473Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:23:24.145515Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:24.176406Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:23:24.194419Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:23:24.245711Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:23:24.245740Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:24.346596Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=922 horizon=6894
2026-09-11T21:23:24.719044Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:23:24.784654Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:23:24.784689Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:24.816039Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:23:24.816079Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:24.837549Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:23:24.956130Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:23:24.956174Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:24.989713Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=265 horizon=14267
2026-09-11T21:23:25.187859Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:23:25.346440Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=10045 success=true
2026-09-11T21:23:25.346482Z  INFO local_candidate{attempt=2}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=15280 exchange_table_bytes=39392 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:23:25.346799Z  INFO local_candidate{attempt=2}: allocated package support memory linked_end=386240 profile_bytes=1080 exchange_table_bytes=39392 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=15280 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525368, 949168)]
2026-09-11T21:23:25.837365Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:23:25.864275Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:25.864311Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:23:25.902590Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:23:25.907268Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=560 success=true
2026-09-11T21:23:25.931750Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:23:25.932787Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:25.932806Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:25.935190Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=13 row_words=21 horizon=2978
2026-09-11T21:23:25.945160Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:23:25.945870Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:25.945880Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:25.947308Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=22 row_words=23 horizon=2909
2026-09-11T21:23:25.951485Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:23:25.954518Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:23:25.954538Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:23:25.959266Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:23:25.960454Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:23:25.961050Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:25.961059Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:25.962676Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=13 row_words=20 horizon=2969
2026-09-11T21:23:25.989318Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:23:25.989944Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:23:25.991317Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:23:25.991335Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:23:25.994405Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:23:25.994897Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:23:25.994912Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.009770Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:23:26.011004Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:23:26.019907Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:23:26.020062Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:23:26.038812Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:23:26.080743Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:23:26.097252Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:23:26.107589Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:23:26.114726Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:23:26.122771Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:23:26.122794Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.126005Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:23:26.127954Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:23:26.127982Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:26.130802Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=21 row_words=157 horizon=2904
2026-09-11T21:23:26.145007Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=127 row_words=165 horizon=16042
2026-09-11T21:23:26.166479Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:23:26.175009Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:23:26.175031Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:23:26.192147Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:23:26.221464Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:23:26.221493Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.228586Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:23:26.228614Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.272786Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:23:26.272817Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:26.279888Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1428 row_words=47 horizon=11896
2026-09-11T21:23:26.395458Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:23:26.419671Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:23:26.462695Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:23:26.495487Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:23:26.495510Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.520311Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:23:26.544110Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:23:26.544143Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:26.553034Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=139 row_words=185 horizon=10717
2026-09-11T21:23:26.571270Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:23:26.571870Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:26.571880Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.573368Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:23:26.596798Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:23:26.596829Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:26.598022Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8139
2026-09-11T21:23:26.688410Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:23:26.722386Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:26.722414Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.741557Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=104 row_words=187 horizon=8266
2026-09-11T21:23:26.779993Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:23:26.781269Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:26.781290Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.784192Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=146 row_words=20 horizon=8454
2026-09-11T21:23:26.788100Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:23:26.826045Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:23:26.826071Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.841887Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=137 row_words=278 horizon=7565
2026-09-11T21:23:26.883614Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:23:26.884777Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:23:26.884795Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.891758Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=100 row_words=23 horizon=2561
2026-09-11T21:23:26.939498Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:23:26.962945Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:23:26.962966Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:26.984789Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:23:27.018676Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:23:27.019764Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:23:27.019780Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.022072Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=1452 row_words=15 horizon=3578
2026-09-11T21:23:27.039077Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:23:27.039729Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:23:27.039740Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.041765Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=684 row_words=18 horizon=4463
2026-09-11T21:23:27.089017Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:23:27.119193Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:27.119251Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:23:27.132786Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:23:27.132826Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:27.156432Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:23:27.175782Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:23:27.187628Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:23:27.187995Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:27.188004Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.189499Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=866 row_words=10 horizon=471
2026-09-11T21:23:27.189767Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:23:27.199025Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:23:27.199395Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:27.199404Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.200488Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=47 row_words=23 horizon=374
2026-09-11T21:23:27.200532Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:23:27.200548Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.205563Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:23:27.210077Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:23:27.211795Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:23:27.212409Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=712 row_words=446 horizon=14529
2026-09-11T21:23:27.216765Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=535 row_words=106 horizon=4485
2026-09-11T21:23:27.218600Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:23:27.219555Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:23:27.226675Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:23:27.240519Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:23:27.240924Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:23:27.240931Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.243143Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=875 row_words=10 horizon=1112
2026-09-11T21:23:27.254484Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:23:27.254889Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:23:27.254897Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.256030Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=39 row_words=39 horizon=4006
2026-09-11T21:23:27.271369Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:23:27.271959Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:23:27.271968Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.273461Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=1104 row_words=41 horizon=172
2026-09-11T21:23:27.277896Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:23:27.278677Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:27.278695Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.280654Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=866 row_words=10 horizon=471
2026-09-11T21:23:27.281340Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:23:27.281626Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:23:27.281631Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.282669Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=46 row_words=9 horizon=216
2026-09-11T21:23:27.290561Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:23:27.290842Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:23:27.290849Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.291662Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=0 row_words=1028 horizon=2206
2026-09-11T21:23:27.292463Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:23:27.292960Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:27.292968Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.294277Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=47 row_words=23 horizon=374
2026-09-11T21:23:27.299631Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:23:27.300167Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:23:27.311577Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:23:27.312115Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:23:27.312123Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.313432Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=14 row_words=49 horizon=5913
2026-09-11T21:23:27.698117Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:23:27.729485Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:23:27.729520Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.737352Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:23:27.773628Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=1090 row_words=186 horizon=7433
2026-09-11T21:23:27.801477Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:23:27.801511Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:27.824318Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:23:27.927529Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:23:27.927567Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:27.961183Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:23:28.000521Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:23:28.038377Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:23:28.038403Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.063330Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=480 row_words=519 horizon=10141
2026-09-11T21:23:28.100718Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:23:28.100757Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:28.121917Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:23:28.128886Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=53 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:23:28.128912Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=53 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.135997Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=53 tile=32 row_words=134 horizon=7129
2026-09-11T21:23:28.140396Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=265 horizon=14267
2026-09-11T21:23:28.145377Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:23:28.147446Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:23:28.148357Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:23:28.149000Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:23:28.159375Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:23:28.159743Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:28.159750Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.161144Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=74 row_words=15 horizon=3625
2026-09-11T21:23:28.163962Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:23:28.167651Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:23:28.172127Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=77
2026-09-11T21:23:28.182372Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:23:28.182794Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=74 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:23:28.182803Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=74 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.182834Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:23:28.184002Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=74 tile=47 row_words=25 horizon=406
2026-09-11T21:23:28.195455Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:23:28.195886Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:28.195893Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.197254Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=114 row_words=24 horizon=2834
2026-09-11T21:23:28.258444Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:23:28.278045Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:23:28.278071Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.296169Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:23:28.611516Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:23:28.647602Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:23:28.647625Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.658220Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:23:28.707803Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=34 row_words=731 horizon=5250
2026-09-11T21:23:28.717780Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:28.717816Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.736965Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:23:28.769629Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:23:28.787582Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:23:28.811557Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:23:28.811588Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.838237Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:23:28.840062Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:23:28.840086Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.844181Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=1095 row_words=135 horizon=822
2026-09-11T21:23:28.891019Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:23:28.895739Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:23:28.895764Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:28.950757Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:23:29.000016Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:23:29.000041Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:29.006631Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:23:29.061977Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=235 row_words=253 horizon=1463
2026-09-11T21:23:29.812144Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:23:29.894073Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:23:29.894105Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:30.042485Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=553 row_words=658 horizon=2731
2026-09-11T21:23:30.768485Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:23:30.768525Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:30.803178Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:23:30.803234Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:30.842704Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=712 row_words=446 horizon=14529
2026-09-11T21:23:31.214584Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=109 row_words=1526 horizon=14755
2026-09-11T21:23:31.415904Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:23:31.415949Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:31.514702Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:23:31.541682Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=149 row_words=1113 horizon=8617
2026-09-11T21:23:31.620033Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:23:31.620059Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:31.812194Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=324 row_words=455 horizon=1906
2026-09-11T21:23:32.650662Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:23:32.693672Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:32.693696Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:32.729110Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=356 row_words=177 horizon=850
2026-09-11T21:23:34.604177Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:23:34.604227Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:34.987879Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=109 row_words=1526 horizon=14755
2026-09-11T21:23:35.674983Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=22108 success=true
2026-09-11T21:23:35.708021Z  INFO local_candidate{attempt=1}: costed final placed program final_cycles=14754327 final_exchange=6580424
2026-09-11T21:23:36.712678Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=152 success=true
2026-09-11T21:23:36.806477Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-11T21:23:37.245717Z  INFO local_candidate{attempt=1}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=395 success=true
2026-09-11T21:23:37.864156Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=24288 success=true
2026-09-11T21:23:37.890822Z  INFO local_candidate{attempt=5}: costed final placed program final_cycles=15188379 final_exchange=6789134
2026-09-11T21:23:38.901770Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=140 success=true
2026-09-11T21:23:39.002956Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=101 success=true
2026-09-11T21:23:39.082332Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:23:39.082363Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:39.438143Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=393 success=true
2026-09-11T21:23:39.455374Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=109 row_words=1526 horizon=14755
2026-09-11T21:23:39.529837Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=20412 success=true
2026-09-11T21:23:39.530034Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=22385 success=true
2026-09-11T21:23:39.530351Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=13623 success=true
2026-09-11T21:23:40.701300Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:40.701434Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:40.784473Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:23:40.856650Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=48 success=true
2026-09-11T21:23:40.862783Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=6 success=true
2026-09-11T21:23:40.870186Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:23:41.046741Z  INFO local_candidate{attempt=3}: exchange table and repeat patch storage exchange_table_bytes=39416 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:23:42.923417Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=204 success=true
2026-09-11T21:23:42.923460Z  INFO local_candidate{attempt=3}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16492 exchange_table_bytes=39416 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:23:42.923478Z  INFO local_candidate{attempt=3}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=39416 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16492 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:23:43.406789Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=483 success=true
2026-09-11T21:23:43.421905Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:23:43.426669Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:23:43.427305Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:23:43.427553Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:23:43.427566Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.427941Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:43.427949Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.429317Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:23:43.429880Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:23:43.431946Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:23:43.432868Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:43.432878Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.435132Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:23:43.436245Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:23:43.436282Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:23:43.436774Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:43.436784Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.437561Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:23:43.437578Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:23:43.438732Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:23:43.440738Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:23:43.444055Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:23:43.444691Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:43.444699Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.446623Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:23:43.448949Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:23:43.449341Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:23:43.449775Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:43.449784Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.449785Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:23:43.449794Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.450945Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:23:43.451714Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:23:43.456821Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:23:43.457394Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:23:43.458073Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:23:43.458082Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:23:43.459921Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:23:43.460472Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:23:43.461927Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:23:43.462143Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:23:43.462378Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=3075 maximum_identical_destinations=1
2026-09-11T21:23:43.462391Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=7378 selected_horizon=7378 endpoint_lower_bound=2816 lower_bound_gap=4562 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.462575Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:23:43.462582Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.463828Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:23:43.464351Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:23:43.471724Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:23:43.472774Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:23:43.473073Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=396 row_words=33 horizon=7378
2026-09-11T21:23:43.474613Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:23:43.474970Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:23:43.474976Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.476154Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:23:43.478106Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:23:43.480112Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:23:43.486150Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:23:43.490793Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:23:43.493879Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:23:43.494479Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:23:43.494928Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:23:43.494937Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.496887Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:23:43.501486Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:23:43.501501Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.503673Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:23:43.508272Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=173 row_words=112 horizon=2940
2026-09-11T21:23:43.509618Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:23:43.510021Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:23:43.510029Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.512237Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:23:43.515859Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:23:43.517354Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:23:43.521976Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:23:43.522358Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:23:43.522367Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.523458Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:23:43.528567Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:23:43.532877Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:23:43.538403Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:23:43.538909Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:23:43.538918Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.540095Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:23:43.673653Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:23:43.673697Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:43.695753Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:23:43.719598Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:23:43.731998Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:23:43.732017Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.740496Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=30170 success=true
2026-09-11T21:23:43.748746Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:23:43.771317Z  INFO local_candidate{attempt=4}: costed final placed program final_cycles=15136485 final_exchange=6724118
2026-09-11T21:23:43.785128Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:23:43.814261Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:23:43.814282Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=11837 selected_horizon=11837 endpoint_lower_bound=7424 lower_bound_gap=4413 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:43.839157Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:23:43.839187Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:43.846591Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=473 row_words=173 horizon=11837
2026-09-11T21:23:43.846639Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:23:43.981104Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:23:44.006172Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:44.006219Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:44.019311Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:23:44.049733Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:23:44.050577Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:44.050592Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:44.053271Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:23:44.133490Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:23:44.133560Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:44.144102Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:23:44.165984Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:23:44.166600Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:44.166612Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:44.168467Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=79 row_words=14 horizon=4464
2026-09-11T21:23:44.195983Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:23:44.196006Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:44.197613Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=94 row_words=38 horizon=8139
2026-09-11T21:23:44.353871Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:23:44.361743Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:23:44.361766Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:44.369239Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:23:44.380083Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:23:44.382523Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:23:44.383529Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:23:44.384251Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:23:44.388746Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:23:44.392560Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:23:44.397335Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:23:44.407922Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:23:44.408368Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:23:44.408377Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:44.409561Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:23:44.707649Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:23:44.740865Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:23:44.740894Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:44.749251Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:23:44.776338Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:23:44.785193Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:44.785234Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:44.819904Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:23:44.825967Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:23:44.855622Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:23:44.855650Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:44.918121Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:23:44.950143Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:23:44.993093Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:23:44.993122Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.022213Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:23:45.068960Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:23:45.115440Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:23:45.117762Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:23:45.117791Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.139875Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:23:45.152454Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:23:45.152476Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=7298 selected_horizon=7298 endpoint_lower_bound=4656 lower_bound_gap=2642 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.190402Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=13 row_words=347 horizon=7298
2026-09-11T21:23:45.597419Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:23:45.617757Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:23:45.617807Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.635278Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:23:45.644961Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:23:45.674723Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:23:45.674754Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.706234Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:23:45.730040Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:23:45.730636Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:45.730646Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.732137Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:23:45.744423Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:23:45.744876Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:23:45.744883Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.746555Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:23:45.767182Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:23:45.854488Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:23:45.862102Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:23:45.862123Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:23:45.873819Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:23:45.967892Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:23:45.969720Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:23:45.969772Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.972971Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:23:45.994233Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:23:45.995575Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:23:45.995588Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:45.998150Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:23:46.202253Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=8
2026-09-11T21:23:46.264215Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:23:46.276734Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:23:46.276768Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=16505 selected_horizon=16505 endpoint_lower_bound=15616 lower_bound_gap=889 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:46.305185Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=170 row_words=415 horizon=16505
2026-09-11T21:23:46.350772Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:23:46.350805Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:46.446016Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=231 row_words=310 horizon=2258
2026-09-11T21:23:46.519519Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:23:46.521240Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:23:46.533136Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:23:46.533151Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:46.549263Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=96 row_words=112 horizon=2347
2026-09-11T21:23:46.580154Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:23:46.580175Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:46.656899Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:23:46.714910Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:23:46.740694Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:23:46.740723Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:23:46.773107Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:23:46.839406Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:23:46.839445Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:46.873489Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=967 row_words=279 horizon=7032
2026-09-11T21:23:47.487971Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:23:47.547318Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:23:47.547355Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:47.590339Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=79 row_words=265 horizon=14267
2026-09-11T21:23:47.592403Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:23:47.592424Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:47.747466Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:23:47.965562Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:23:48.095331Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:23:48.095357Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:48.143248Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:23:48.143284Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:48.221966Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:23:48.274869Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-11T21:23:48.293004Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:23:48.329251Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:23:48.329276Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:23:48.390099Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=630 horizon=12637
2026-09-11T21:23:48.407098Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=3769 success=true
2026-09-11T21:23:48.498305Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=91 success=true
2026-09-11T21:23:48.979484Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=427 success=true
2026-09-11T21:23:49.015960Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:23:49.015997Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:49.145902Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=149 row_words=1113 horizon=8617
2026-09-11T21:23:49.795602Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10265 success=true
2026-09-11T21:23:49.820003Z  INFO local_candidate{attempt=2}: costed final placed program final_cycles=14795016 final_exchange=6884201
2026-09-11T21:23:50.092884Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10562 success=true
2026-09-11T21:23:50.127084Z  INFO local_candidate{attempt=7}: costed final placed program final_cycles=15223452 final_exchange=6804011
2026-09-11T21:23:50.378051Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10847 success=true
2026-09-11T21:23:50.410483Z  INFO local_candidate{attempt=6}: costed final placed program final_cycles=15204039 final_exchange=6784598
2026-09-11T21:23:50.851276Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=183 success=true
2026-09-11T21:23:50.942040Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=90 success=true
2026-09-11T21:23:51.164088Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=149 success=true
2026-09-11T21:23:51.249350Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=85 success=true
2026-09-11T21:23:51.363364Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=375 success=true
2026-09-11T21:23:51.395168Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=142 success=true
2026-09-11T21:23:51.479471Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=84 success=true
2026-09-11T21:23:51.795952Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=383 success=true
2026-09-11T21:23:51.933299Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=379 success=true
2026-09-11T21:23:57.307923Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:23:57.307962Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:23:57.681441Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:23:57.762818Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=14355 success=true
2026-09-11T21:24:06.522010Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=8759 success=true
2026-09-11T21:24:06.551273Z  INFO local_candidate{attempt=3}: costed final placed program final_cycles=15142776 final_exchange=6792617
2026-09-11T21:24:07.579762Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=159 success=true
2026-09-11T21:24:07.683845Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=104 success=true
2026-09-11T21:24:08.146462Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=408 success=true
2026-09-11T21:24:09.439518Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=1 before=15324756 after=14754327 changed_operations=[] opened_boundaries=[]
2026-09-11T21:24:12.847026Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=6 threads=16
2026-09-11T21:24:18.025199Z  INFO local_candidate{attempt=7}: screened exchange table geometry expansion_ms=4239 expansion_and_footprint_ms=5177 estimated_row_bytes=69920 heuristic_row_bytes=146312 geometry_fragments_per_tile=7870 fragment_limit=16384
2026-09-11T21:24:18.133586Z  INFO local_candidate{attempt=7}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:24:18.184540Z  INFO local_candidate{attempt=4}: screened exchange table geometry expansion_ms=4441 expansion_and_footprint_ms=5337 estimated_row_bytes=71672 heuristic_row_bytes=147276 geometry_fragments_per_tile=8089 fragment_limit=16384
2026-09-11T21:24:18.295433Z  INFO local_candidate{attempt=4}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:24:18.345834Z  INFO local_candidate{attempt=3}: screened exchange table geometry expansion_ms=4586 expansion_and_footprint_ms=5498 estimated_row_bytes=71856 heuristic_row_bytes=146672 geometry_fragments_per_tile=8058 fragment_limit=16384
2026-09-11T21:24:18.356496Z  INFO local_candidate{attempt=5}: screened exchange table geometry expansion_ms=4562 expansion_and_footprint_ms=5509 estimated_row_bytes=71456 heuristic_row_bytes=146312 geometry_fragments_per_tile=8062 fragment_limit=16384
2026-09-11T21:24:18.457121Z  INFO local_candidate{attempt=3}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:24:18.471394Z  INFO local_candidate{attempt=5}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:24:18.593071Z  INFO local_candidate{attempt=6}: screened exchange table geometry expansion_ms=4780 expansion_and_footprint_ms=5745 estimated_row_bytes=69920 heuristic_row_bytes=146312 geometry_fragments_per_tile=7870 fragment_limit=16384
2026-09-11T21:24:18.648306Z  INFO local_candidate{attempt=2}: screened exchange table geometry expansion_ms=4865 expansion_and_footprint_ms=5800 estimated_row_bytes=72032 heuristic_row_bytes=145624 geometry_fragments_per_tile=8105 fragment_limit=16384
2026-09-11T21:24:18.660988Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:24:18.663049Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:24:18.663741Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:18.663751Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.665406Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:24:18.666863Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:24:18.666866Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:24:18.667171Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:24:18.667541Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:24:18.667558Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.668902Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:24:18.671348Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:24:18.673005Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:24:18.675739Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:24:18.676410Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:24:18.680887Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:24:18.681653Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:18.681670Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.682677Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:24:18.683405Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:24:18.686349Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:24:18.687126Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:24:18.687137Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.688252Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:24:18.688776Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:24:18.688799Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:24:18.688812Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.689870Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:24:18.690511Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:24:18.690523Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.690731Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:24:18.690868Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:24:18.691571Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:24:18.691594Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.692467Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:24:18.692592Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:24:18.693566Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:24:18.700292Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:24:18.703799Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:24:18.704261Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:18.704270Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.705448Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:24:18.707440Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:24:18.707992Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:24:18.708002Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.709624Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:24:18.712084Z  INFO local_candidate{attempt=6}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:24:18.715924Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:24:18.716360Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:18.716367Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.717533Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:24:18.722433Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:24:18.725856Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:24:18.737180Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:24:18.741354Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:24:18.742661Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:24:18.742894Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:24:18.742910Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.743505Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:18.743521Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.745971Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:24:18.747510Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:24:18.750476Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:24:18.750937Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:18.750947Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.752591Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:24:18.752857Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:24:18.757102Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:24:18.762692Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:24:18.763077Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:18.763085Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.764051Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:24:18.768723Z  INFO local_candidate{attempt=2}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:24:18.769725Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:24:18.770192Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:24:18.770232Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:18.772229Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:24:18.780303Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:24:18.780960Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:24:18.780969Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:18.782081Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:24:18.786947Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:24:18.789003Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:24:18.789025Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:24:18.792663Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:24:18.817677Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:24:18.818694Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:24:18.818707Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:24:18.820993Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:24:18.897022Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:24:18.911936Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:24:18.911984Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:18.912097Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:24:18.930151Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:24:19.044395Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:24:19.073226Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:24:19.073268Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:24:19.076409Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:24:19.076434Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:19.083571Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:24:19.105823Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:24:19.136342Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:24:19.159765Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:24:19.159792Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.170873Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:24:19.172444Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:24:19.187771Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:24:19.187801Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.195263Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:24:19.196009Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:19.196021Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.197871Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:24:19.204020Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:24:19.213211Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:24:19.236013Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:24:19.236041Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.249441Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:24:19.265284Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:24:19.265317Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:19.275162Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:24:19.275487Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:24:19.276303Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:24:19.276316Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.278390Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:24:19.293422Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:24:19.293978Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:24:19.293988Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.295595Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:24:19.418078Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:24:19.423740Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:24:19.423759Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.429170Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:24:19.436839Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:24:19.438687Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:24:19.439563Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:24:19.440166Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:24:19.585886Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:24:19.608213Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:19.608235Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.640753Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:24:19.818353Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:24:19.843371Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:24:19.843392Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:19.875358Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:24:20.052638Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:24:20.080884Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:24:20.080914Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.114749Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:24:20.138507Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:24:20.146146Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:24:20.156409Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:24:20.156440Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.160896Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:24:20.160924Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.170124Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:24:20.170879Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:20.170890Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.172364Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:24:20.172460Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:24:20.194674Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:24:20.214875Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:24:20.215316Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:20.215325Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.216481Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:24:20.232091Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:24:20.243119Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:24:20.594069Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:24:20.608680Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:24:20.609332Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:24:20.609356Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.624288Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:24:20.629878Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:24:20.629899Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.642759Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:24:20.665177Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:24:20.665986Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:20.665998Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.667733Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:24:20.845446Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:24:20.852264Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:24:20.852295Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:24:20.863176Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:24:20.919601Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:24:20.922040Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:24:20.962231Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:24:20.962260Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:20.978303Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:24:20.987778Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:24:20.987805Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.043777Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:24:21.047563Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:24:21.050376Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:24:21.086778Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:24:21.086801Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.093171Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:24:21.093194Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.104255Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:24:21.128319Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:24:21.155838Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:24:21.156409Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:21.156420Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.157870Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:24:21.217985Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:24:21.229500Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:24:21.270263Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:24:21.292476Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:24:21.312571Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:24:21.312593Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.317315Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:24:21.317335Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.329663Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:24:21.350012Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:24:21.388971Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:24:21.406796Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:24:21.406820Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.420665Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:24:21.450591Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:24:21.493525Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:24:21.493551Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.512318Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:24:21.525153Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:24:21.543050Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:24:21.543074Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.557622Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:24:21.595715Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:24:21.618452Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:24:21.618477Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.630590Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:24:21.631730Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:24:21.638568Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:24:21.638583Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:24:21.649236Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:24:21.653922Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:24:21.654683Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:21.654695Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.656345Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:24:21.718615Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:24:21.733727Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:24:21.751600Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:24:21.751621Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.757898Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:24:21.766250Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:24:21.775141Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:24:21.777615Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:24:21.777642Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.781925Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:24:21.781949Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:24:21.792550Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:24:21.826364Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:24:21.847238Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:24:21.847268Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:24:21.853089Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:21.853123Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:24:21.853464Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:24:21.886033Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:24:21.887134Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:24:21.887699Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:21.887709Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.889303Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:24:21.902945Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:24:21.911448Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:24:21.914312Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:24:21.914680Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:21.914687Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.916120Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:24:21.925030Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:24:21.925387Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:21.925396Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.925466Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:24:21.925937Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:21.925953Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.926368Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:24:21.927474Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:24:21.931292Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:24:21.935552Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:24:21.937120Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:24:21.943311Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:24:21.944178Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:24:21.950069Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:24:21.951566Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:24:21.955694Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:24:21.964743Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:24:21.965099Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:24:21.965106Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.967066Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:24:21.969036Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:24:21.969053Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.977417Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:24:21.977801Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:24:21.977807Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.978880Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:24:21.979995Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:24:21.980733Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:24:21.984800Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:24:21.987192Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:24:21.987218Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:24:21.991960Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:24:21.993285Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:24:21.993872Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:24:21.993880Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:21.995474Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:24:21.997700Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:24:21.998196Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:24:21.998320Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:21.998330Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.000154Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:24:22.003318Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:24:22.003605Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:24:22.003609Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.004607Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:24:22.011711Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:24:22.012147Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:22.012155Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.012167Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:24:22.012464Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:24:22.012471Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.013228Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:24:22.013332Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:24:22.019411Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:24:22.021225Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:24:22.030562Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:24:22.031255Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:24:22.031266Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.032558Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:24:22.214766Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:24:22.221889Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:24:22.221909Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:24:22.233343Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:24:22.256245Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:24:22.281249Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:24:22.281278Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.313099Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:24:22.379043Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:24:22.403256Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:24:22.403288Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.416788Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:24:22.442089Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:24:22.442859Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:22.442872Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.444640Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:24:22.511232Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:24:22.537796Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:22.537828Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:24:22.571078Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:24:22.601706Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:24:22.602640Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:24:22.602654Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:24:22.604987Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:24:22.620385Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:24:22.621017Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:24:22.621025Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:24:22.622609Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:24:22.666393Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:24:22.675424Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:24:22.675889Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:24:22.701229Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:22.701255Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:24:22.734155Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:24:22.758058Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:24:22.758093Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=13 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:22.765709Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:24:22.766941Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:24:22.766957Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:24:22.769400Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:24:22.785131Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:24:22.785966Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:24:22.785977Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:24:22.787539Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:24:22.834750Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:24:22.844820Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:24:22.876869Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=13 tile=79 row_words=922 horizon=6894
2026-09-11T21:24:22.877159Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:24:22.905539Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:22.905624Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:24:22.926058Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:24:22.931002Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:24:22.936758Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:24:22.945233Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:24:22.951904Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:24:22.959890Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:24:22.960506Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:22.960520Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.963029Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:24:22.977795Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:24:22.978421Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:22.978437Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:22.980434Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:24:22.986891Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:24:22.986947Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:24:22.987982Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:24:22.987997Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:24:22.990409Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:24:22.993539Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:24:22.996637Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:24:23.005896Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:24:23.006581Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:24:23.006591Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:24:23.006707Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:24:23.008121Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:24:23.008443Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:24:23.017067Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:24:23.022129Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:24:23.022165Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:23.034344Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:24:23.034886Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:24:23.034897Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.037313Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:24:23.049332Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:24:23.049833Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:24:23.049842Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.051221Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:24:23.054714Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:24:23.054834Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:24:23.058793Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:24:23.064733Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:24:23.067955Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:24:23.068672Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:24:23.068684Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.070216Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:24:23.078790Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:24:23.079082Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:24:23.079087Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.080161Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:24:23.082799Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:24:23.082815Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.088673Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:24:23.088965Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:24:23.088970Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.089836Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:24:23.097641Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:24:23.114276Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:24:23.138359Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:24:23.155659Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:24:23.167047Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:23.167072Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:24:23.170655Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:24:23.202920Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:24:23.212319Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:24:23.212344Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.239725Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:24:23.241015Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:24:23.241034Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:24:23.243810Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:24:23.261393Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:24:23.262161Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:24:23.262171Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:24:23.263919Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:24:23.287520Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:24:23.289963Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:24:23.289989Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.316142Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:24:23.322386Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:24:23.323087Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:23.323097Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.324621Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:24:23.326804Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:24:23.339944Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:24:23.339971Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:23.347236Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:24:23.361960Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:24:23.362423Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:23.362433Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.364537Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:24:23.375821Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:24:23.376252Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:23.376263Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.377438Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:24:23.383353Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:24:23.394432Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:24:23.395130Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:24:23.395138Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.396529Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:24:23.401911Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:24:23.425720Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:24:23.439044Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:24:23.439073Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.466923Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:24:23.508043Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:24:23.610873Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:24:23.617329Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:24:23.617349Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.624077Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:24:23.633984Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:24:23.636937Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:24:23.638587Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:24:23.639792Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:24:23.672743Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:24:23.678778Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:24:23.678806Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:23.686551Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:24:23.697359Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:24:23.700331Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:24:23.701582Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:24:23.702491Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:24:23.992412Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:24:24.000926Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:24:24.019947Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:24:24.019980Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:24:24.054564Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:24:24.055436Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:24:24.106764Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:24:24.106794Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.146643Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:24:24.183352Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:24:24.187452Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:24:24.187481Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.197098Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:24:24.197120Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.219070Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:24:24.219746Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:24.219757Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.221568Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:24:24.223778Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:24:24.244484Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:24:24.270277Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:24:24.271554Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:24:24.271567Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.278867Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:24:24.303270Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:24:24.348813Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:24:24.348843Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.372575Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:24:24.397281Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:24:24.419576Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:24:24.420887Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:24:24.420913Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.427924Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:24:24.552086Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:24:24.577736Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:24:24.577774Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:24:24.603923Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:24:24.610544Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:24:24.614771Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:24:24.614789Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.633720Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:24:24.715302Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:24:24.715362Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:24.739111Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:24:24.742917Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:24:24.757486Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:24:24.757514Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.775581Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:24:24.797142Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:24:24.833629Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:24:24.833652Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:24.878612Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:24:24.878659Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:24.886651Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:24:24.888245Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:24:24.902442Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:24:24.950767Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:24:24.950808Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.024641Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:24:25.058183Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:24:25.058763Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:25.058775Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.060369Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:24:25.085479Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:24:25.102445Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:24:25.102923Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:25.102934Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.105295Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:24:25.117063Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:24:25.117525Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:25.117535Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.118819Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:24:25.124786Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:24:25.136386Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:24:25.137007Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:24:25.137026Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.138487Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:24:25.417635Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:24:25.417690Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:25.457994Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:24:25.659787Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:24:25.695136Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:25.695165Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.739380Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:24:25.766781Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:24:25.767409Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:25.767419Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.768847Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:24:25.782013Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:24:25.782569Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:25.782577Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.784095Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:24:25.817993Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:24:25.834929Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:24:25.845854Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:24:25.852688Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:25.852708Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.900147Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:24:25.915864Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=40 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:24:25.928315Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:24:25.929005Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:25.929013Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.930430Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:24:25.943261Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:24:25.943788Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:25.943794Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.945399Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:24:25.951494Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:24:25.956900Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:24:25.956920Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:25.969397Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:24:25.973763Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:24:25.973779Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:25.994300Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:24:25.996630Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:25.996647Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:25.996694Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:24:25.998559Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:24:26.007331Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:24:26.061594Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:24:26.066578Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:24:26.066596Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.071297Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:24:26.083539Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:24:26.083945Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:24:26.083952Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.084957Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:24:26.242227Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:24:26.305085Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:24:26.305123Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.322880Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:24:26.357820Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:24:26.357851Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.413990Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:24:26.414030Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.425284Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:24:26.438550Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:24:26.443226Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:24:26.448566Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:24:26.458781Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:24:26.458805Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.462400Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:26.462415Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.464485Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:24:26.464709Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:24:26.465685Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:24:26.477175Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:26.477194Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.478429Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:24:26.500384Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:24:26.500417Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.504557Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=62 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:24:26.524029Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=64 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:24:26.544883Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:24:26.544906Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.547401Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:24:26.552762Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:24:26.562961Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:24:26.562976Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.564317Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:24:26.564402Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:24:26.565449Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:24:26.565477Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.576695Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:24:26.586440Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:24:26.586458Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.588095Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:24:26.598179Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:24:26.598192Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.599619Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:24:26.609879Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:26.609906Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.611239Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:24:26.629616Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:24:26.629642Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.630819Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:24:26.644432Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:24:26.644498Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.645622Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:24:26.648115Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:24:26.665929Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=70 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:24:26.699678Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:24:26.699725Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.727444Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:24:26.732833Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:24:26.733914Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:24:26.733932Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.740441Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:24:26.740469Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:24:26.741883Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:24:26.752861Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:24:26.755721Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:24:26.756865Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:24:26.757692Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:24:26.765006Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:24:26.778292Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:24:26.778685Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:26.778692Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.780410Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:24:26.790676Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:24:26.791088Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:26.791095Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.792288Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:24:26.797714Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:24:26.802789Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:24:26.804761Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:24:26.811554Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:24:26.812671Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:24:26.820753Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:24:26.836378Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:24:26.836833Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:24:26.836840Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.838784Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:24:26.851157Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:24:26.851614Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:24:26.851630Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:24:26.851638Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.852969Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:24:26.869398Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:24:26.870035Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:24:26.870043Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.871505Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:24:26.880527Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:24:26.880857Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:24:26.880862Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.882032Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:24:26.891350Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:24:26.891690Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:24:26.891695Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.892767Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:24:26.897947Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:24:26.898670Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:26.898679Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:26.900323Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:24:26.901246Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:24:26.918992Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:24:26.919010Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=12 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:26.920958Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6280
2026-09-11T21:24:27.057457Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:24:27.132540Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:24:27.132580Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:24:27.239268Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:24:27.283855Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:24:27.284568Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:27.284581Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:27.286160Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:24:27.304460Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:24:27.304487Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:27.306237Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:24:27.727020Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:24:27.852123Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:24:27.852160Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:28.066754Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:24:28.070792Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:24:28.070827Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:28.125247Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:24:28.125970Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:24:28.125983Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:28.127272Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:24:28.130772Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:24:28.155104Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=56 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:24:28.295158Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:24:28.295195Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:28.301743Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:24:28.681568Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7298 paired_horizon=13815 use_paired=false
2026-09-11T21:24:28.717351Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:24:28.717384Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:28.759481Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:24:28.759517Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=19 initial_horizon=7298 selected_horizon=7298 endpoint_lower_bound=4656 lower_bound_gap=2642 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:28.785955Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:24:28.794628Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=19 tile=13 row_words=347 horizon=7298
2026-09-11T21:24:28.829080Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:28.829102Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:28.830978Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:24:28.861602Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:24:28.874922Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=45 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:24:28.895999Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:28.896023Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:28.897906Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:24:28.905300Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:24:28.910081Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:24:28.916013Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:24:28.953686Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:24:28.953710Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:29.113310Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:24:29.165227Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:24:29.166315Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:24:29.166328Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:29.168904Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:24:29.182865Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:24:29.182896Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:29.190964Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:24:29.191704Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:24:29.191715Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:29.193815Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:24:29.200398Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:24:29.785468Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:24:29.901555Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:24:29.901607Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:29.950886Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:24:30.057287Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:24:30.057319Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=13 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.184437Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=13 tile=79 row_words=1051 horizon=6343
2026-09-11T21:24:30.200106Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:24:30.233665Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:24:30.256051Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:24:30.256080Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:24:30.282864Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:24:30.318338Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:24:30.318364Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.368301Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:24:30.393361Z  INFO local_candidate{attempt=6}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:24:30.417352Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:24:30.418830Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:30.418858Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.445133Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:24:30.453957Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:24:30.487679Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:30.487712Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.489438Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:24:30.495329Z  INFO local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:24:30.503446Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:24:30.504624Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:30.504642Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.505644Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:24:30.505669Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.506162Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:24:30.508485Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:24:30.508516Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.509308Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:24:30.509327Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.558233Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:24:30.567482Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:24:30.567509Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.571859Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:24:30.616853Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:24:30.630163Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:24:30.630193Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=13 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.647451Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:24:30.655804Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:24:30.656950Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:24:30.656965Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.659429Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:24:30.675180Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:24:30.675779Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:24:30.675792Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.677567Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:24:30.687980Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:24:30.687999Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.705275Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:24:30.705308Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.716303Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:24:30.719656Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:24:30.746473Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=13 tile=154 row_words=925 horizon=6751
2026-09-11T21:24:30.810907Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:24:30.825402Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:24:30.845566Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:24:30.846041Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:24:30.846052Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.847286Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:24:30.863248Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:24:30.863270Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.870424Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:24:30.870457Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.873813Z  INFO local_candidate{attempt=2}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:24:30.880656Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:24:30.882894Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:24:30.924331Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:24:30.925487Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:24:30.925506Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:30.933009Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:24:30.952426Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:24:30.952463Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:30.963522Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:24:31.006165Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:24:31.006195Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:31.026842Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:24:31.026875Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:31.045099Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:24:31.069480Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:24:31.149363Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:24:31.149404Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:31.176439Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:24:31.176484Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:31.192092Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:24:31.202692Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:24:31.223021Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:24:31.230677Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:24:31.239552Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:24:31.239572Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.242660Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:24:31.242678Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.258735Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:24:31.259311Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:24:31.322308Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:24:31.326958Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:24:31.326976Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.331354Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:24:31.373885Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:24:31.394575Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:24:31.394620Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:31.398682Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:24:31.398708Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:24:31.406056Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:24:31.413295Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:24:31.427784Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:24:31.513831Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:24:31.513864Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:31.524722Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:24:31.524742Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.682862Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:24:31.708508Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:24:31.708531Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.719356Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:24:31.721825Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:24:31.730134Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:24:31.779799Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:24:31.780479Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:31.780491Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.782030Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:24:31.783386Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:24:31.783404Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:31.784694Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:24:31.800562Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:24:31.805631Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:24:31.805647Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.806070Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:24:31.806089Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=12 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:31.807403Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8137
2026-09-11T21:24:31.810984Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:24:31.818759Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:24:31.819259Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:31.819270Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.820804Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:24:31.833667Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:24:31.834132Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:31.834139Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.835537Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:24:31.889811Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:24:31.900523Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:24:31.928152Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:24:31.969256Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:24:31.969276Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:31.995988Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:24:32.057139Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:24:32.057189Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:32.169808Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:24:32.201362Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:32.201385Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:32.238821Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:24:32.258031Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:24:32.258076Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:32.288087Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:24:32.463470Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:24:32.463522Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:32.475953Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:24:32.481616Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:24:32.518964Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:24:32.518998Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:32.545953Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:24:32.545991Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:24:32.552976Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:24:32.568614Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:24:32.642579Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:24:32.680277Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:24:32.680751Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:32.680761Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:32.682103Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:24:32.696813Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:24:32.697612Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:32.697626Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:32.699631Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:24:32.705463Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:24:32.705489Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=12 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:32.706613Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8137
2026-09-11T21:24:33.098556Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:24:33.127526Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:24:33.127546Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.158142Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:24:33.224826Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:24:33.224896Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:24:33.229591Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:24:33.229609Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.234167Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:24:33.244971Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:24:33.244994Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.257415Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:24:33.258363Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:24:33.258376Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.260831Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:24:33.262639Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:24:33.264121Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:24:33.278053Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:24:33.278843Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:24:33.278853Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.280653Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:24:33.285464Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:24:33.303407Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:24:33.303439Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.330241Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:24:33.352041Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:24:33.352065Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.356488Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:24:33.357097Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:33.357103Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.358471Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:24:33.374652Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:24:33.375108Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:33.375114Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:33.376581Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:24:33.415788Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:24:33.752272Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:24:33.820717Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:24:33.820749Z  INFO local_candidate{attempt=2}: 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
2026-09-11T21:24:33.918798Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:24:34.008593Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:24:34.034633Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:24:34.034656Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:34.070046Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:24:34.094475Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:34.094505Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:34.096039Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:24:34.109181Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:34.109199Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:34.110600Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:24:34.136084Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:24:34.136103Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:34.139063Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:24:34.159130Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:24:34.159149Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:34.161104Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:24:34.332627Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:24:34.332673Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:34.374330Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:24:34.487179Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:24:34.487231Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:34.570777Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:24:34.804271Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:24:34.831811Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:24:34.831848Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:34.872927Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:24:34.873386Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:24:34.873408Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:34.933457Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:24:35.071825Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:24:35.095546Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:24:35.095567Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:35.121868Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:24:35.168395Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:24:35.168428Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:35.174515Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:24:35.375001Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:24:35.375036Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:35.408316Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:24:35.785680Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:24:35.785717Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:35.807373Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:24:35.821768Z  INFO local_candidate{attempt=2}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:24:35.927267Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:24:35.927293Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:36.082363Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:24:36.082402Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:36.091897Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:24:36.091928Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=34 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:36.098002Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:24:36.159271Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:24:36.164619Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:24:36.164649Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:36.174363Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=34 tile=707 row_words=445 horizon=14301
2026-09-11T21:24:36.250799Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:24:36.338370Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:24:36.338407Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:36.501070Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:24:36.863356Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:24:36.863387Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:36.895270Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:24:36.937515Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:24:36.937547Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=13 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:37.074712Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=13 tile=159 row_words=1160 horizon=8593
2026-09-11T21:24:37.301248Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:24:37.301292Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:37.348916Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:24:39.623907Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:24:39.623946Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=33 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:39.983342Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=33 tile=109 row_words=1528 horizon=14869
2026-09-11T21:24:40.038458Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:24:40.038490Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=13 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:40.165269Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=13 tile=159 row_words=1160 horizon=8593
2026-09-11T21:24:40.694446Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:24:40.711780Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:24:40.711797Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:40.738123Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:24:40.766809Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:24:40.767753Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:40.767765Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:40.770119Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:24:43.736216Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:24:43.736255Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:43.977691Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:24:43.977729Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:44.120891Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:24:44.344943Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:24:52.156260Z  INFO local_candidate{attempt=2}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:24:52.156312Z  INFO local_candidate{attempt=2}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:52.588421Z  INFO local_candidate{attempt=2}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:24:52.740350Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=68 success=true
2026-09-11T21:24:52.745418Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=64 success=true
2026-09-11T21:24:52.749373Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=8 success=true
2026-09-11T21:24:52.749556Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-11T21:24:52.756134Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:24:52.759616Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:24:52.918586Z  INFO local_candidate{attempt=2}: exchange table and repeat patch storage exchange_table_bytes=40472 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:24:52.925411Z  INFO local_candidate{attempt=3}: exchange table and repeat patch storage exchange_table_bytes=40496 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:24:54.786840Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=232 success=true
2026-09-11T21:24:54.786882Z  INFO local_candidate{attempt=3}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16424 exchange_table_bytes=40496 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:24:54.786912Z  INFO local_candidate{attempt=3}: allocated package support memory linked_end=386240 profile_bytes=1072 exchange_table_bytes=40496 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16424 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525360, 949168)]
2026-09-11T21:24:54.786936Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=236 success=true
2026-09-11T21:24:54.786965Z  INFO local_candidate{attempt=2}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9084 generated_code_bytes=15212 exchange_table_bytes=40472 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395392, 524288)]
2026-09-11T21:24:54.786978Z  INFO local_candidate{attempt=2}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=40472 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=15212 code_address=395392 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:24:54.952684Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:24:54.952730Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:54.998528Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:24:55.058730Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=38 success=true
2026-09-11T21:24:55.060923Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=40 success=true
2026-09-11T21:24:55.062470Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:24:55.064465Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:24:55.069324Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:24:55.072280Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:24:55.079871Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=59 success=true
2026-09-11T21:24:55.085377Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=5 success=true
2026-09-11T21:24:55.099580Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:24:55.236584Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=46 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:55.236625Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=46 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.237830Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=46 tile=47 row_words=23 horizon=374
2026-09-11T21:24:55.244301Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=56 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:55.244333Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=56 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.247137Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=65 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:24:55.247167Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=65 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.247348Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=56 tile=866 row_words=10 horizon=471
2026-09-11T21:24:55.249375Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=65 tile=39 row_words=39 horizon=4006
2026-09-11T21:24:55.253874Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:55.253905Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=43 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.257747Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=43 tile=74 row_words=15 horizon=3625
2026-09-11T21:24:55.259326Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=48 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:24:55.259345Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=48 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.260522Z  INFO local_candidate{attempt=5}: exchange table and repeat patch storage exchange_table_bytes=40016 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:24:55.260665Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=48 tile=14 row_words=49 horizon=5913
2026-09-11T21:24:55.261619Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:24:55.264639Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:24:55.264662Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:24:55.268933Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=57 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:24:55.268951Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=57 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.270873Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=57 tile=47 row_words=23 horizon=374
2026-09-11T21:24:55.272250Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:24:55.279508Z  INFO local_candidate{attempt=7}: exchange table and repeat patch storage exchange_table_bytes=39376 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:24:55.283138Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=66 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:24:55.283159Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=66 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.285678Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=66 tile=1104 row_words=41 horizon=172
2026-09-11T21:24:55.290094Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:24:55.296072Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:24:55.296088Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:55.301536Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:24:55.302975Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:24:55.303257Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=67 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:24:55.303275Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=67 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.304621Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:24:55.304635Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:24:55.305304Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=67 tile=46 row_words=9 horizon=216
2026-09-11T21:24:55.307539Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:24:55.314436Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=61 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:24:55.336448Z  INFO local_candidate{attempt=6}: exchange table and repeat patch storage exchange_table_bytes=39512 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:24:55.344422Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=63 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:24:55.345271Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=44 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:24:55.363036Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=64 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:24:55.363072Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=64 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.366058Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=64 tile=875 row_words=10 horizon=1112
2026-09-11T21:24:55.369026Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=68 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:24:55.369047Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=68 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.370779Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=68 tile=0 row_words=1028 horizon=2206
2026-09-11T21:24:55.385877Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=45 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:24:55.385901Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=45 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.390335Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=45 tile=866 row_words=10 horizon=471
2026-09-11T21:24:55.394163Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=69 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:24:55.401816Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:24:55.411155Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=624 success=true
2026-09-11T21:24:55.418983Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:24:55.428677Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=40 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:55.428701Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=40 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.433239Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=40 tile=146 row_words=20 horizon=8454
2026-09-11T21:24:55.435670Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=648 success=true
2026-09-11T21:24:55.589017Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:24:55.589046Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.616002Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:24:55.662985Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:24:55.700197Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:24:55.700239Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:24:55.744434Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:24:55.755131Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:24:55.755161Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=28 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:55.755351Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:24:55.763354Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:24:55.763371Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:24:55.766940Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=14502
2026-09-11T21:24:55.776982Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:24:55.972936Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:24:56.016822Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:24:56.016846Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:56.037175Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:24:56.082008Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:24:56.083193Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:24:56.083225Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:56.091247Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:24:56.240747Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=39 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:24:56.281924Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=39 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:24:56.281953Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=39 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:56.295467Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=39 tile=104 row_words=187 horizon=8266
2026-09-11T21:24:56.342886Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=41 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:24:56.342929Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=41 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:56.382085Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=41 tile=1090 row_words=186 horizon=7433
2026-09-11T21:24:56.415063Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:24:56.427256Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:24:56.427289Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:56.448093Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:24:56.777559Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:24:56.795670Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=49 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:24:56.795704Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=49 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:56.808638Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:56.808659Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:24:56.849898Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:24:56.857116Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=49 tile=34 row_words=731 horizon=5250
2026-09-11T21:24:56.929640Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=24 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:24:56.929668Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=24 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:56.932292Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=24 tile=723 row_words=30 horizon=2545
2026-09-11T21:24:57.045784Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=50 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:24:57.045820Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=50 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:57.053093Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=50 tile=32 row_words=134 horizon=7129
2026-09-11T21:24:57.085410Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=55 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:24:57.113821Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:24:57.114016Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:24:57.156548Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:24:57.156575Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:57.159112Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:24:57.159143Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:57.173356Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:24:57.182041Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:24:57.248494Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:24:57.248533Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:57.259248Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:24:57.436808Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:24:57.472075Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:57.472104Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:57.510664Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:24:57.535516Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:24:57.536008Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:57.536015Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:57.537414Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:24:57.585738Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:24:57.588911Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:24:57.596728Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:24:57.604925Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:24:57.604954Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:57.620033Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:24:57.620136Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:24:57.638554Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:24:57.638580Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:57.656010Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:24:57.849488Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:24:57.857314Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:24:57.857340Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:24:57.869170Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:24:57.886878Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:24:57.895189Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:24:57.895227Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:24:57.907384Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:24:57.978176Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:24:58.002488Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:24:58.002520Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:58.015124Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:24:58.023062Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:24:58.040002Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:24:58.040812Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:58.040826Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:58.042503Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:24:58.084840Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:24:58.084871Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:58.118547Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:24:58.320221Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1278 success=true
2026-09-11T21:24:58.320263Z  INFO local_candidate{attempt=6}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9084 generated_code_bytes=16460 exchange_table_bytes=39512 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395392, 524288)]
2026-09-11T21:24:58.320281Z  INFO local_candidate{attempt=6}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=39512 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=16460 code_address=395392 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:24:58.364480Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=42 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:24:58.364516Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=42 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:58.445794Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=42 tile=235 row_words=253 horizon=1463
2026-09-11T21:24:58.487949Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:24:58.488654Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:58.488667Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:58.490666Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:24:58.556480Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:24:58.569185Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:24:58.664190Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:24:58.689522Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:24:58.689545Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:58.722112Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:24:58.794521Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:24:58.811371Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:24:58.811410Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:58.823032Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:58.823061Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:24:58.832380Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:24:58.836923Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:24:58.861533Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:24:58.862787Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:24:58.862812Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:58.875402Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:24:58.890793Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:24:58.893584Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:24:58.894631Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:24:58.894647Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:24:58.897028Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:24:58.905594Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:24:58.905615Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:24:58.913320Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:24:58.913957Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:24:58.913968Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:24:58.915566Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:24:58.923072Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:24:58.923924Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:58.923940Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:58.926099Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:24:58.944055Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:24:58.962557Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:24:58.963486Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:24:58.963515Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=12 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:58.965536Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8137
2026-09-11T21:24:58.969815Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:24:58.973334Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:24:58.977403Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:24:58.978366Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:24:58.978381Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:24:58.980810Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:24:58.994574Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:24:58.994594Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:58.996219Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:24:58.996828Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:24:58.996836Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:24:58.998426Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:24:59.006952Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:24:59.032484Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:24:59.033330Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:24:59.033345Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:59.035457Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:24:59.042984Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:24:59.052636Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:24:59.110130Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1417 success=true
2026-09-11T21:24:59.110171Z  INFO local_candidate{attempt=5}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9084 generated_code_bytes=16412 exchange_table_bytes=40016 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395392, 524288)]
2026-09-11T21:24:59.110185Z  INFO local_candidate{attempt=5}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=40016 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=16412 code_address=395392 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:24:59.164448Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:24:59.164494Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:24:59.171185Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1424 success=true
2026-09-11T21:24:59.171238Z  INFO local_candidate{attempt=7}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9084 generated_code_bytes=16460 exchange_table_bytes=39376 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395392, 524288)]
2026-09-11T21:24:59.171253Z  INFO local_candidate{attempt=7}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=39376 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=16460 code_address=395392 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:24:59.208879Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:24:59.287639Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:24:59.360907Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1040 success=true
2026-09-11T21:24:59.382027Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:24:59.382055Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:24:59.507896Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:24:59.625889Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:24:59.657368Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:24:59.682423Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:24:59.682449Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:59.695815Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:24:59.695844Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:24:59.714384Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:24:59.750804Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:24:59.993837Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:25:00.015311Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:25:00.015335Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.040230Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:25:00.041397Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=931 success=true
2026-09-11T21:25:00.061965Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:25:00.062456Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:00.062468Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.063986Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:25:00.074005Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:25:00.074421Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:00.074430Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.075479Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:25:00.080861Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:25:00.085712Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:25:00.087563Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:25:00.089599Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=918 success=true
2026-09-11T21:25:00.094328Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:25:00.095416Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:25:00.103461Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:25:00.117871Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:25:00.118320Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:25:00.118335Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.120025Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:25:00.131532Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:25:00.132001Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:25:00.132009Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.133173Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:25:00.148999Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:25:00.149701Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:25:00.149721Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.151135Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:25:00.159662Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:25:00.160033Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:25:00.160040Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.161189Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:25:00.169666Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:25:00.169964Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:25:00.169970Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.170882Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:25:00.179228Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:25:00.362358Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:25:00.419136Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:25:00.419169Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.463286Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:25:00.486958Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:25:00.504121Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:25:00.504150Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.517036Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:25:00.517575Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:00.517588Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.519018Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:25:00.524296Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:25:00.540602Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:25:00.555038Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:25:00.555440Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:00.555451Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.556959Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:25:00.566953Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:25:00.567328Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:00.567338Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.568369Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:25:00.568686Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:25:00.569812Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:25:00.569829Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.573651Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:25:00.576979Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:25:00.584045Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:25:00.584564Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:25:00.584572Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.585820Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:25:00.878649Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:25:00.890736Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:25:00.890765Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:00.908370Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:25:01.031556Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:25:01.074817Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:25:01.074850Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.092702Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:25:01.276899Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:25:01.276943Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=34 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:01.337001Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=70 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:25:01.337047Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=70 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:01.357573Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=34 tile=707 row_words=445 horizon=14348
2026-09-11T21:25:01.434598Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:25:01.468576Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:25:01.468616Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:01.490143Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:25:01.490174Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.525432Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:25:01.545625Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:25:01.545658Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.552632Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=70 tile=324 row_words=455 horizon=1906
2026-09-11T21:25:01.563976Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:25:01.564501Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:25:01.594282Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:25:01.596912Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:25:01.597666Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:01.597684Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.599313Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:25:01.617765Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=71 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:25:01.617800Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=71 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:01.619052Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=71 tile=47 row_words=25 horizon=406
2026-09-11T21:25:01.622121Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:25:01.637670Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:25:01.638097Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:01.638106Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.638429Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:25:01.638457Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.640281Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:25:01.643198Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:25:01.644615Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:25:01.651214Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:25:01.651627Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:01.651635Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.652843Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:25:01.654983Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:25:01.658980Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:25:01.669884Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:25:01.670529Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:25:01.670540Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.671831Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:25:01.685251Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:25:01.685271Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.701457Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:25:01.723514Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:25:01.723545Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:01.726834Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:25:01.751774Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:25:01.751803Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=31 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:01.754390Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=5448
2026-09-11T21:25:01.768375Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:25:01.768866Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:01.768878Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.770520Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:25:01.791626Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:25:01.799046Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:25:01.799064Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:25:01.810010Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:25:01.810413Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:25:01.830108Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:25:01.838844Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:25:01.841493Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:25:01.844753Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:25:01.844782Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.873321Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:01.873349Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.908642Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:25:01.909303Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:25:01.931720Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:25:01.932195Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:01.932218Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.932398Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:25:01.933532Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:25:01.945216Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:25:01.945632Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:01.945640Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:01.946994Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:25:01.958860Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:25:01.958879Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:25:01.987811Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:25:01.991679Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:25:02.002071Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:25:02.057289Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:25:02.062947Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:25:02.062966Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.066540Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:25:02.066572Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=13 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:02.069867Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:25:02.074570Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:25:02.078869Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:25:02.081052Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:25:02.081971Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:25:02.082637Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:25:02.089411Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:25:02.091287Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:25:02.091306Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.101882Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:25:02.102275Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:02.102283Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.103628Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:25:02.105198Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:25:02.107948Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:25:02.124892Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:25:02.124916Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.138897Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:25:02.149435Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:25:02.159937Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:25:02.209491Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=13 tile=159 row_words=1160 horizon=8593
2026-09-11T21:25:02.234945Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:25:02.234980Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:02.256732Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:25:02.266002Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=35 tile=1095 row_words=136 horizon=822
2026-09-11T21:25:02.279882Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:25:02.279904Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.291748Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:25:02.293828Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:02.293848Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=36 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:02.295383Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=36 tile=13 row_words=21 horizon=2978
2026-09-11T21:25:02.304076Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:25:02.315456Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:25:02.315909Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:25:02.316119Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:02.316129Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.316366Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:02.316377Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.318111Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:25:02.318184Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:25:02.320465Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:25:02.327126Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:25:02.327141Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:25:02.327613Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:25:02.328013Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:02.328022Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.329129Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:25:02.334330Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:25:02.337670Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:25:02.339431Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:25:02.341395Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:25:02.348749Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:25:02.349839Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:25:02.352564Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:25:02.357102Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:25:02.358986Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:25:02.359003Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:25:02.369546Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:25:02.370221Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:25:02.370666Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:25:02.370675Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.372453Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:25:02.383180Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:25:02.383621Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:25:02.383631Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.384832Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:25:02.399353Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:25:02.399975Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:25:02.399986Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.400758Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:25:02.400796Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:02.401401Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:25:02.409148Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:25:02.409472Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:25:02.409480Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.410539Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:25:02.418261Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:25:02.418565Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:25:02.418571Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.419426Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:25:02.426771Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:25:02.454119Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:25:02.521884Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:25:02.540486Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:25:02.540523Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:02.543690Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:25:02.543708Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.550159Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:25:02.554244Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:25:02.575697Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:25:02.576368Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:02.576380Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.578313Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:25:02.683053Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:25:02.711555Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:02.711576Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:25:02.746398Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:25:02.776808Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:25:02.776837Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:02.778877Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:25:02.779902Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:25:02.779915Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:25:02.782344Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:25:02.793745Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:25:02.798010Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:25:02.798665Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:25:02.798674Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:25:02.800179Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:25:02.818011Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:25:02.818052Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:02.845645Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:25:02.847003Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:25:02.856718Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:25:02.901108Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:25:02.925930Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:25:02.925980Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:02.929042Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:25:02.929072Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:02.934701Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:25:02.961386Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:25:02.964639Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:25:02.999135Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:25:02.999158Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.014626Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:25:03.045102Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:25:03.045137Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:03.054619Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:25:03.054640Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.054894Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:25:03.062342Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:25:03.078277Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:25:03.130818Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:25:03.132280Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:25:03.132298Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.135090Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:25:03.141955Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:25:03.151359Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:25:03.158151Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:25:03.158176Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.172748Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:25:03.175985Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:03.176003Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:25:03.185319Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:25:03.199148Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:03.199174Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:25:03.208027Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:25:03.213125Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:25:03.218718Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:25:03.218736Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.225669Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:25:03.232625Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:25:03.235486Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:25:03.237672Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:25:03.238418Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:25:03.238657Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:25:03.238670Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:25:03.239553Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:25:03.240383Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:25:03.241075Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:25:03.247543Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:25:03.256034Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:25:03.256655Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:25:03.256664Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:25:03.258128Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:25:03.260221Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:25:03.260577Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:03.260585Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.262173Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:25:03.262636Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:25:03.263494Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:25:03.263509Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:25:03.265903Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:25:03.272002Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:25:03.272403Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:03.272412Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.273544Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:25:03.278887Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:25:03.281256Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:25:03.281873Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:25:03.281883Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:25:03.283352Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:25:03.283775Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:25:03.285688Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:25:03.292391Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:25:03.293484Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:25:03.301620Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:25:03.301680Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:25:03.310772Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:25:03.316386Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:25:03.316839Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:25:03.316848Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.319250Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:25:03.327630Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:25:03.330993Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:25:03.331480Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:25:03.331497Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.332722Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:25:03.336916Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:25:03.349050Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:25:03.349697Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:25:03.349709Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.351164Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:25:03.360345Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:25:03.360681Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:25:03.360687Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.361828Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:25:03.370666Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:25:03.370970Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:25:03.370977Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.371918Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:25:03.380068Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:25:03.462435Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:25:03.480709Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:25:03.480754Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:03.500693Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:25:04.311239Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:25:04.392648Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:25:04.392691Z  INFO local_candidate{attempt=2}: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
2026-09-11T21:25:04.491886Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:25:04.506182Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:25:04.508351Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:25:04.532493Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:25:04.533737Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:25:04.534300Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:04.534312Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.535756Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:25:04.559293Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:25:04.559313Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:04.560586Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8139
2026-09-11T21:25:04.575684Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:04.575707Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.620389Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:25:04.620681Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:25:04.625743Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:25:04.625777Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.648858Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:25:04.649562Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:04.649573Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.651138Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:25:04.661456Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:25:04.661484Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:04.665808Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:25:04.666346Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:04.666356Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.668105Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:25:04.677543Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:25:04.677566Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.726548Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:25:04.737866Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:25:04.738754Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:25:04.749863Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:25:04.775780Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:25:04.776621Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:04.776639Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.778266Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:25:04.781917Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:25:04.782505Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:04.782516Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.784168Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:25:04.807025Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:25:04.819031Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:25:04.821917Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:25:04.822347Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:04.822359Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.824398Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:25:04.826717Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:25:04.834810Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:25:04.835185Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:04.835193Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.836359Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:25:04.840838Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:25:04.843300Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:25:04.853524Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:25:04.857560Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:25:04.858124Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:25:04.858132Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.859534Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:25:04.870897Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:25:04.870925Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.884132Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:25:04.884811Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:25:04.884824Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.885984Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:25:04.891967Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:25:04.895943Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:25:04.900827Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:25:04.938381Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:25:04.967930Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:25:04.968485Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:04.968496Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:04.969869Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:25:04.992097Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:25:05.006174Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:25:05.006579Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:05.006590Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:05.008130Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:25:05.017940Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:25:05.018307Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:05.018316Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:05.019228Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:25:05.024524Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:25:05.035059Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:25:05.035586Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:25:05.035595Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:05.036827Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:25:05.039257Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:25:05.046143Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:25:05.046160Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:05.052696Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:25:05.062049Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:25:05.064253Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:25:05.065235Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:25:05.065935Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:25:05.234822Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:25:05.258105Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:25:05.258127Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:05.271665Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:25:05.297811Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:25:05.298889Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:05.298914Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:05.302256Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:25:05.332937Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:25:05.332982Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:05.344283Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:25:05.365518Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:25:05.365558Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=33 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:05.796177Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=33 tile=109 row_words=1528 horizon=14869
2026-09-11T21:25:05.919368Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:25:05.945473Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:25:05.945499Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:05.978433Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:25:06.134252Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:25:06.170940Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:25:06.170973Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.197235Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:25:06.229971Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:25:06.230005Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:25:06.240055Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:25:06.248813Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:25:06.264854Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:25:06.285109Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:25:06.285131Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.347802Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:25:06.377687Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:25:06.501524Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:25:06.501551Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:06.504306Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:25:06.510463Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:25:06.510489Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.517871Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:25:06.527845Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:25:06.530180Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:25:06.531149Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:25:06.531825Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:25:06.538717Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:25:06.552146Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:25:06.552520Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:06.552529Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.554188Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:25:06.554807Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:25:06.564171Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:25:06.564554Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:06.564563Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.565583Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:25:06.570586Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:25:06.575058Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:25:06.576767Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:25:06.583263Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:25:06.584185Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:25:06.592145Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:25:06.606951Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:25:06.607362Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:25:06.607373Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.608994Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:25:06.609616Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:25:06.621291Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:25:06.621722Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:25:06.621730Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.622986Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:25:06.638983Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:25:06.639653Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:25:06.639665Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.641035Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:25:06.649873Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:25:06.650177Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:25:06.650182Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.651283Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:25:06.659684Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:25:06.659986Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:25:06.659991Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.660824Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:25:06.668945Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:25:06.717436Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:25:06.739182Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:25:06.739231Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:06.757641Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:25:06.757668Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.787327Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:25:06.794765Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:25:06.797065Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:25:06.889602Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:25:06.889635Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:06.956242Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:25:06.987086Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:25:07.035534Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:25:07.035576Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.052707Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:25:07.066701Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:25:07.067721Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:25:07.067748Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.102673Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:25:07.111805Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:25:07.112830Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:25:07.112846Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.115574Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:25:07.130085Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:25:07.130105Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:25:07.133520Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:25:07.134157Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:25:07.134168Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.136141Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:25:07.159425Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:25:07.269793Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:25:07.326599Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:25:07.327251Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:25:07.327267Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.328406Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:25:07.334492Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:25:07.338573Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:25:07.343515Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:25:07.690067Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:25:07.742658Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:25:07.742695Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.809874Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:25:07.841863Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:25:07.842571Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:07.842581Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.844091Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:25:07.872240Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:25:07.886060Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:25:07.888058Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:25:07.888530Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:07.888541Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.890115Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:25:07.901389Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:25:07.901782Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:07.901790Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.902836Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:25:07.908652Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:25:07.919931Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:25:07.920717Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:25:07.920727Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:07.922121Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:25:08.003870Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:25:08.003903Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:08.204053Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:25:08.262504Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:25:08.263246Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:25:08.263262Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:08.264514Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:25:08.272648Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:25:08.279171Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:25:08.285289Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:25:08.290374Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:25:08.294186Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:25:08.298965Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:25:08.404639Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:25:08.531780Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:25:08.531813Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:08.717924Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:25:08.758709Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:25:08.792760Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:25:08.792790Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:25:08.828423Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:25:08.829787Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:25:08.829804Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:08.833528Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:25:08.856933Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:25:08.857915Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:25:08.857931Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:08.860570Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:25:08.868036Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:25:08.897189Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:25:08.933549Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:25:08.933571Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:08.937245Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:25:08.937779Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:08.937787Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:08.939214Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:25:08.954049Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:25:08.954701Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:25:08.954711Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:08.956405Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:25:08.983119Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:25:09.035173Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:25:09.059921Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:25:09.059949Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.090344Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:25:09.112680Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:25:09.113190Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:09.113211Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.114554Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:25:09.125191Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:25:09.125660Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:25:09.125669Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.126764Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:25:09.134119Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:25:09.167529Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:25:09.167555Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.230868Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:25:09.343077Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:25:09.343109Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:09.359755Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:25:09.386330Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:25:09.391854Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:25:09.391872Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.398738Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:25:09.408735Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:25:09.411534Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:25:09.412675Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:25:09.413520Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:25:09.420378Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:25:09.433051Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:25:09.433431Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:09.433440Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.435007Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:25:09.445445Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:25:09.445836Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:09.445843Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.446892Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:25:09.452188Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:25:09.457183Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:25:09.459180Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:25:09.460003Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:25:09.465931Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:25:09.467065Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:25:09.474883Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:25:09.481617Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:25:09.486359Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:25:09.486378Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:09.489802Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:25:09.490299Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:25:09.490308Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.492531Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:25:09.493610Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:25:09.504310Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:25:09.504810Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:25:09.504817Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.505990Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:25:09.521801Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:25:09.522528Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:25:09.522539Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.523930Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:25:09.527672Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:25:09.527695Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:25:09.532631Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:25:09.533002Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:25:09.533008Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.534107Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:25:09.542443Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:25:09.542743Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:25:09.542749Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.543677Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:25:09.548039Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:25:09.548059Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.551611Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:25:09.599218Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:25:09.622006Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:25:09.658382Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:25:09.658877Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:09.658887Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.660210Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:25:09.682130Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:25:09.682155Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:09.683390Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8139
2026-09-11T21:25:09.744223Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:25:09.801180Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:25:09.801227Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.824051Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:25:09.827998Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:25:09.828029Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:09.877307Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:25:09.878678Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:25:09.878698Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:09.888748Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:25:09.962401Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=149 row_words=1113 horizon=8617
2026-09-11T21:25:10.032370Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:25:10.032407Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:10.108134Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:25:10.156086Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:25:10.157146Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:25:10.157161Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:10.159813Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:25:10.176721Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:25:10.177367Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:25:10.177379Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:10.179310Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:25:10.283628Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:25:10.295419Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:25:10.295445Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:10.316764Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:25:10.323386Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:25:10.418763Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:25:10.442355Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:25:10.442403Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:10.494269Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:25:10.536915Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:25:10.536950Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:10.583455Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:25:10.777028Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:25:10.804537Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:25:10.804570Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:25:10.832911Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:25:10.866256Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:25:10.889541Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:25:10.889562Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:25:10.899485Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:25:10.917044Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:25:10.944040Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:25:10.944077Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:10.975085Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:25:11.002617Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:25:11.002645Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.180763Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:25:11.184697Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:25:11.184730Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:11.191410Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:25:11.238006Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:25:11.238041Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.261062Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:25:11.368707Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=1051 horizon=6343
2026-09-11T21:25:11.408051Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:25:11.408652Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:11.408665Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.410013Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:25:11.434778Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:25:11.474721Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:25:11.474749Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.499689Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:25:11.515716Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:25:11.532617Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:25:11.532644Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:11.539878Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:25:11.546959Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:25:11.546976Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7298 selected_horizon=7298 endpoint_lower_bound=4656 lower_bound_gap=2642 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.550426Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:25:11.552074Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:25:11.552102Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:11.576050Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=347 horizon=7298
2026-09-11T21:25:11.585080Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:11.585108Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.585317Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:25:11.607481Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:25:11.611700Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:25:11.616690Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:25:11.633684Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:25:11.663102Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:25:11.663721Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:11.663732Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.665698Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:25:11.680991Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:25:11.681578Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:11.681589Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.683372Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:25:11.744925Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:25:11.758190Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:25:11.863533Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:25:11.874027Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:25:11.874047Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:11.890486Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:25:12.018612Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:25:12.044443Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:25:12.044463Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:12.075274Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:25:12.529491Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:25:12.529539Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:12.542463Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:25:12.722977Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:25:12.753624Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:12.753652Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:12.788167Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:25:12.811605Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:25:12.812035Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:12.812056Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:12.813486Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:25:12.824296Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:25:12.824692Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:12.824698Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:12.825903Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:25:12.868998Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:25:12.877785Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:25:12.988363Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:25:13.012328Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:25:13.015021Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:25:13.050782Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:25:13.050817Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:25:13.063866Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:25:13.063896Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:13.079752Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:25:13.079777Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:25:13.096794Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:25:13.102722Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:25:13.102759Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.143055Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:25:13.168576Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:25:13.176370Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:25:13.176809Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:13.176818Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.178035Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:25:13.191383Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:25:13.191929Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:25:13.191937Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.193503Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6280
2026-09-11T21:25:13.201048Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:25:13.201489Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:13.201501Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.202759Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:25:13.216178Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:25:13.216770Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:25:13.216781Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.218300Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:25:13.246456Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:25:13.251482Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:25:13.270046Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:25:13.270074Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:13.301573Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:25:13.377468Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:25:13.377500Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:13.385806Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=139 row_words=185 horizon=10717
2026-09-11T21:25:13.400341Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:25:13.400379Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:13.463711Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:25:13.544835Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:25:13.563496Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:25:13.563515Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.582033Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:25:13.591133Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:25:13.591157Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:13.609668Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:25:13.667027Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:25:13.671622Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:25:13.671641Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.675751Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:25:13.697473Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:25:13.698286Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:25:13.698298Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.700694Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:25:13.716003Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:25:13.716288Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:25:13.716884Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:25:13.716895Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.718837Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:25:13.720501Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:25:13.720518Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.724984Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:25:13.746268Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:25:13.765099Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:25:13.765117Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.782477Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:25:13.812117Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:25:13.872355Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:25:13.877028Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:25:13.877054Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.911682Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:25:13.911706Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.924098Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:25:13.929044Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:25:13.931358Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:25:13.975094Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:25:13.976078Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:25:13.976094Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:13.982896Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:25:14.032415Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:25:14.032443Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:14.238012Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:25:14.255032Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:25:14.264007Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:25:14.264025Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:14.279084Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:25:14.292550Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:25:14.293328Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:25:14.293342Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:14.294467Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:25:14.656900Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:25:14.682796Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:25:14.682830Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:14.706132Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:25:14.706166Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:14.711644Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:25:14.732713Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:25:14.733138Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:14.733147Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:14.734412Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:25:14.745323Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:25:14.745726Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:14.745733Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:14.746912Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:25:14.830086Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=149 row_words=1113 horizon=8617
2026-09-11T21:25:14.961569Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:25:14.974092Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:25:14.998549Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:25:14.998579Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.003603Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:25:15.026695Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:25:15.039044Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:25:15.039062Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.047105Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:25:15.047639Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:15.047648Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.048999Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:25:15.050566Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:25:15.050591Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.061288Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:25:15.124130Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:25:15.149836Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:15.149866Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.187153Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:25:15.201325Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:25:15.209534Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:25:15.209982Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:15.209990Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.211234Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:25:15.222332Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:25:15.222698Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:15.222706Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.223990Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:25:15.266460Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:25:15.266483Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:15.267154Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:25:15.276363Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:25:15.281582Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:25:15.397532Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:25:15.397558Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:15.404016Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:25:15.440355Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:25:15.440393Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:15.487966Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:25:15.523612Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:25:15.523642Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:15.538496Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:25:15.550755Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:25:15.592239Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:25:15.592262Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.663942Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:25:15.686273Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=154 row_words=925 horizon=6751
2026-09-11T21:25:15.718781Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:25:15.718806Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.757642Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:25:15.757672Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:15.766529Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:25:15.814996Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=922 horizon=6894
2026-09-11T21:25:15.885178Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:25:15.888850Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:25:15.888866Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.892588Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:25:15.913164Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:25:15.913888Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:25:15.913901Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.916176Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:25:15.931232Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:25:15.931750Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:25:15.931759Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:15.933434Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:25:16.127929Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:25:16.153900Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:25:16.153939Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:16.179679Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:25:16.205652Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:25:16.225681Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:25:16.225702Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:16.245179Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:25:16.261930Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:25:16.267418Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:25:16.267447Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:16.271987Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:25:16.491738Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:25:16.576251Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:25:16.576286Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:16.644398Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:25:16.744971Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:25:16.750944Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:25:16.750970Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:16.757409Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:25:16.898671Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:25:16.910855Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:25:16.910890Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:16.921733Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:25:16.927017Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:25:16.927054Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:16.951661Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:25:16.955267Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:25:16.982535Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:25:16.983052Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:16.983060Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:16.984435Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:25:16.988963Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:25:16.988984Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:17.018715Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:25:17.018744Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:17.023971Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:25:17.024001Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:17.037417Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:25:17.056740Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:25:17.060232Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:25:17.090400Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:25:17.090444Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:17.166348Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:25:17.216739Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:25:17.255122Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:25:17.255148Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:17.280449Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:25:17.799022Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:25:17.799054Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:17.928712Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:25:17.964110Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:25:17.964146Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:18.002832Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:25:18.100254Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:25:18.100290Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:18.131828Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:25:18.207040Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:25:18.726871Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:25:18.726905Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:18.773440Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:25:18.860620Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:25:18.860665Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:19.016978Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:25:19.055613Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:25:19.055650Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:19.131538Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=712 row_words=446 horizon=14529
2026-09-11T21:25:19.156475Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:25:19.663719Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:25:19.663759Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:19.751457Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:25:22.730611Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:25:22.730644Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:23.134391Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:25:23.182383Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:25:23.182419Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:23.211454Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=27775 success=true
2026-09-11T21:25:23.552194Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=162 row_words=1526 horizon=14751
2026-09-11T21:25:29.703044Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:25:29.703077Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:30.083145Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:25:30.157209Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=34746 success=true
2026-09-11T21:25:30.157234Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=30067 success=true
2026-09-11T21:25:30.157594Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=30796 success=true
2026-09-11T21:25:30.158351Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=30116 success=true
2026-09-11T21:25:30.217337Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=59 success=true
2026-09-11T21:25:30.222846Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=5 success=true
2026-09-11T21:25:30.236378Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:25:30.395045Z  INFO local_candidate{attempt=4}: exchange table and repeat patch storage exchange_table_bytes=40048 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:25:32.054097Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=106 success=true
2026-09-11T21:25:32.054132Z  INFO local_candidate{attempt=4}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=16300 exchange_table_bytes=40048 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:25:32.054147Z  INFO local_candidate{attempt=4}: allocated package support memory linked_end=386240 profile_bytes=1064 exchange_table_bytes=40048 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=16300 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525352, 949168)]
2026-09-11T21:25:32.536974Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=482 success=true
2026-09-11T21:25:32.553974Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:25:32.554517Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=56 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:32.554530Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=56 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.555587Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:25:32.556328Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=56 tile=866 row_words=10 horizon=471
2026-09-11T21:25:32.556424Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:25:32.556437Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.557881Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=39 row_words=39 horizon=4006
2026-09-11T21:25:32.563792Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:25:32.565867Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:25:32.566050Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:25:32.566440Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:32.566451Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.567058Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:25:32.567070Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:25:32.567401Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=47 row_words=23 horizon=374
2026-09-11T21:25:32.568960Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:25:32.569566Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:25:32.569753Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:25:32.569897Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:25:32.569904Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.570740Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=47 row_words=23 horizon=374
2026-09-11T21:25:32.572436Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:25:32.573348Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:25:32.573878Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:25:32.574617Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:25:32.574630Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.575686Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:25:32.575976Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=1104 row_words=41 horizon=172
2026-09-11T21:25:32.577137Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:25:32.577489Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:25:32.584244Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:25:32.584613Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:25:32.584619Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.584852Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:25:32.585232Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:25:32.585318Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:25:32.585332Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.585821Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=46 row_words=9 horizon=216
2026-09-11T21:25:32.585883Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:25:32.585892Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:25:32.586291Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=14 row_words=49 horizon=5913
2026-09-11T21:25:32.587655Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:25:32.588763Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:25:32.589171Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:32.589178Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.590358Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:25:32.591071Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:25:32.591464Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:25:32.591473Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.593153Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=875 row_words=10 horizon=1112
2026-09-11T21:25:32.594414Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:25:32.594735Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:25:32.594741Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.595592Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=0 row_words=1028 horizon=2206
2026-09-11T21:25:32.599779Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9388 success=true
2026-09-11T21:25:32.602007Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:25:32.603439Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:25:32.611104Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:25:32.611122Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:32.612119Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8139
2026-09-11T21:25:32.616694Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:25:32.631768Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:25:32.640392Z  INFO local_candidate{attempt=2}: costed final placed program final_cycles=14224587 final_exchange=6579452
2026-09-11T21:25:32.641794Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:25:32.641815Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2940 selected_horizon=2940 endpoint_lower_bound=2304 lower_bound_gap=636 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:32.643771Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:25:32.651053Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=173 row_words=112 horizon=2940
2026-09-11T21:25:32.654096Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:25:32.818260Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:25:32.849433Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:25:32.849458Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:25:32.880870Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:25:33.057540Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:25:33.080982Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:25:33.081013Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.092120Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=104 row_words=187 horizon=8266
2026-09-11T21:25:33.114108Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:25:33.114830Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:33.114844Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.116766Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=146 row_words=20 horizon=8454
2026-09-11T21:25:33.129628Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:25:33.130085Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:33.130093Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.131798Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=74 row_words=15 horizon=3625
2026-09-11T21:25:33.154283Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:25:33.170680Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:25:33.171171Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:25:33.171183Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.173568Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=866 row_words=10 horizon=471
2026-09-11T21:25:33.180082Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:25:33.184072Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:25:33.189074Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:25:33.203237Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:25:33.223186Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:25:33.223219Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.251984Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=1090 row_words=186 horizon=7433
2026-09-11T21:25:33.332632Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:25:33.372996Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:25:33.373032Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.394874Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:25:33.414168Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:25:33.414217Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:33.416038Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:25:33.430908Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:25:33.437091Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:25:33.438179Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:25:33.438194Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.445465Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:25:33.470109Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:33.470135Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:25:33.508238Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:25:33.524974Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:25:33.527425Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:25:33.528469Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:25:33.529253Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:25:33.535478Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:25:33.582779Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:25:33.582811Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:33.590489Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=14502
2026-09-11T21:25:33.748644Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:25:33.760283Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:25:33.760304Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.775810Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:25:33.794738Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:25:33.820599Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:25:33.820618Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:33.879687Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=34 row_words=731 horizon=5250
2026-09-11T21:25:34.018955Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:25:34.024164Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:25:34.024182Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:34.030199Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=32 row_words=134 horizon=7129
2026-09-11T21:25:34.347900Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:25:34.376196Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:25:34.376238Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:34.410575Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:25:34.431089Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:25:34.431541Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:34.431550Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:34.432815Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:25:34.483817Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:25:34.486145Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:25:34.486160Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:34.488543Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=723 row_words=30 horizon=2545
2026-09-11T21:25:34.496121Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:25:34.532748Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:25:34.532786Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:34.564038Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:25:34.756309Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:25:34.767289Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:25:34.776558Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:25:34.776580Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:34.784842Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:25:34.831335Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:25:34.835648Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:25:34.835671Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:34.884199Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:25:34.885273Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:25:34.885295Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:34.954056Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=235 row_words=253 horizon=1463
2026-09-11T21:25:35.009672Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:25:35.010122Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:25:35.010130Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:35.011464Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=13 row_words=21 horizon=2978
2026-09-11T21:25:35.061003Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:25:35.061960Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:25:35.061977Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:35.063507Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=47 row_words=25 horizon=406
2026-09-11T21:25:35.065037Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:25:35.134434Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:25:35.136255Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:25:35.136274Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:35.136307Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:25:35.136328Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:25:35.139100Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:25:35.157289Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:25:35.158639Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:25:35.158653Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:35.160867Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=5448
2026-09-11T21:25:35.232055Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:25:35.276308Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:25:35.318521Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:25:35.318552Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:35.347967Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:25:35.614742Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:25:35.630880Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:25:35.630911Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:35.631143Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:25:35.655072Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1095 row_words=136 horizon=822
2026-09-11T21:25:35.662749Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=2102 success=true
2026-09-11T21:25:35.669523Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:25:35.677148Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:25:35.677170Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:35.693539Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:25:35.696059Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:25:35.696076Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:35.712849Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:25:35.907796Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=244 success=true
2026-09-11T21:25:36.094094Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:25:36.112707Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:25:36.112731Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:36.126736Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:25:36.627907Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:25:36.627947Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:36.660465Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:25:36.722767Z  INFO local_candidate{attempt=2}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=504 success=true
2026-09-11T21:25:36.891412Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:25:37.032646Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:25:37.032679Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:37.148099Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:25:37.226760Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=324 row_words=455 horizon=1906
2026-09-11T21:25:37.255241Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:25:37.255276Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:25:37.428388Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:25:38.342109Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:25:38.342146Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:38.418263Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=712 row_words=447 horizon=14529
2026-09-11T21:25:39.532042Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:25:39.532088Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:39.713252Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=149 row_words=1113 horizon=8617
2026-09-11T21:25:39.999747Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:25:40.010506Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:25:40.010531Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:25:40.026157Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:25:40.055010Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:25:40.187332Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:25:40.187364Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:40.245766Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:25:40.466811Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10309 success=true
2026-09-11T21:25:40.494092Z  INFO local_candidate{attempt=7}: costed final placed program final_cycles=14653023 final_exchange=6499262
2026-09-11T21:25:41.170078Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11012 success=true
2026-09-11T21:25:41.195614Z  INFO local_candidate{attempt=3}: costed final placed program final_cycles=14572239 final_exchange=6487760
2026-09-11T21:25:41.508930Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=144 success=true
2026-09-11T21:25:41.603012Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=94 success=true
2026-09-11T21:25:42.033698Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=382 success=true
2026-09-11T21:25:42.221998Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=145 success=true
2026-09-11T21:25:42.306379Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=84 success=true
2026-09-11T21:25:42.745884Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=391 success=true
2026-09-11T21:25:46.505077Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:25:46.505118Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:25:46.814198Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=162 row_words=1526 horizon=14751
2026-09-11T21:25:46.891744Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=14354 success=true
2026-09-11T21:25:52.082310Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=21924 success=true
2026-09-11T21:25:52.109603Z  INFO local_candidate{attempt=6}: costed final placed program final_cycles=14633610 final_exchange=6479849
2026-09-11T21:25:53.259080Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=242 success=true
2026-09-11T21:25:53.362963Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=103 success=true
2026-09-11T21:25:53.858183Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=439 success=true
2026-09-11T21:25:54.658779Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=24500 success=true
2026-09-11T21:25:54.713175Z  INFO local_candidate{attempt=5}: costed final placed program final_cycles=14617950 final_exchange=6484385
2026-09-11T21:25:56.149598Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=187 success=true
2026-09-11T21:25:56.259258Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=109 success=true
2026-09-11T21:25:56.672317Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9780 success=true
2026-09-11T21:25:56.699843Z  INFO local_candidate{attempt=4}: costed final placed program final_cycles=14566056 final_exchange=6419369
2026-09-11T21:25:56.726595Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=412 success=true
2026-09-11T21:25:57.816873Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=194 success=true
2026-09-11T21:25:57.911975Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=95 success=true
2026-09-11T21:25:58.469540Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=461 success=true
2026-09-11T21:25:59.880945Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=2 before=14754327 after=14224587 changed_operations=[13] opened_boundaries=[353]
2026-09-11T21:26:03.659274Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=5 threads=16
2026-09-11T21:26:08.719090Z  INFO local_candidate{attempt=5}: screened exchange table geometry expansion_ms=4140 expansion_and_footprint_ms=5059 estimated_row_bytes=71688 heuristic_row_bytes=144004 geometry_fragments_per_tile=8062 fragment_limit=16384
2026-09-11T21:26:08.826367Z  INFO local_candidate{attempt=5}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:26:08.849046Z  INFO local_candidate{attempt=7}: screened exchange table geometry expansion_ms=4238 expansion_and_footprint_ms=5189 estimated_row_bytes=70152 heuristic_row_bytes=144004 geometry_fragments_per_tile=7870 fragment_limit=16384
2026-09-11T21:26:08.963890Z  INFO local_candidate{attempt=7}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:26:09.002562Z  INFO local_candidate{attempt=6}: screened exchange table geometry expansion_ms=4370 expansion_and_footprint_ms=5343 estimated_row_bytes=70152 heuristic_row_bytes=144004 geometry_fragments_per_tile=7870 fragment_limit=16384
2026-09-11T21:26:09.118508Z  INFO local_candidate{attempt=6}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:26:09.160815Z  INFO local_candidate{attempt=4}: screened exchange table geometry expansion_ms=4277 expansion_and_footprint_ms=5501 estimated_row_bytes=71904 heuristic_row_bytes=144968 geometry_fragments_per_tile=8089 fragment_limit=16384
2026-09-11T21:26:09.328198Z  INFO local_candidate{attempt=4}: eliminated unread FP8 cast input padding clears removed=900
2026-09-11T21:26:09.335158Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:26:09.338265Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:26:09.339549Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:26:09.340154Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:09.340161Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.340678Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:26:09.341351Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:26:09.341364Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.341578Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:09.343265Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:26:09.349303Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:26:09.350241Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:26:09.350260Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:26:09.352120Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:26:09.358401Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:26:09.358973Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:09.358985Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.360969Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:26:09.365262Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:26:09.365997Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:26:09.366008Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.366714Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:26:09.367454Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:26:09.368465Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:26:09.368488Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:26:09.372524Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:26:09.373781Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:26:09.374309Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:09.374320Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.375586Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:26:09.375924Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:26:09.376309Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:26:09.376320Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.377531Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:26:09.383049Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:26:09.386363Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:26:09.386821Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:26:09.386831Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.387880Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:26:09.390254Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:26:09.390712Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:26:09.391273Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:26:09.391374Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:09.391386Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.392306Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:26:09.393775Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:26:09.393894Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:26:09.395720Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:26:09.401980Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:26:09.402498Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:26:09.404369Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:26:09.407106Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:26:09.407682Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:09.407694Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.409100Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:26:09.409157Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:26:09.409414Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:26:09.410072Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:09.410081Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.410220Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:26:09.411832Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:26:09.415472Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:26:09.420373Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:26:09.421728Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:26:09.422315Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:26:09.422925Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:26:09.422934Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.425475Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:26:09.425491Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:09.425811Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:26:09.426952Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:26:09.435682Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:26:09.436469Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:26:09.436480Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.438182Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:26:09.447539Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:26:09.448081Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:26:09.448090Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.449236Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:26:09.601422Z  INFO local_candidate{attempt=3}: screened exchange table geometry expansion_ms=4950 expansion_and_footprint_ms=5941 estimated_row_bytes=72088 heuristic_row_bytes=144364 geometry_fragments_per_tile=8058 fragment_limit=16384
2026-09-11T21:26:09.604852Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:26:09.607553Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:26:09.613708Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:26:09.613731Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.622397Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:26:09.627073Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:26:09.627097Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:26:09.634282Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:26:09.637393Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:26:09.638871Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:26:09.639979Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:26:09.655167Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:26:09.656846Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:26:09.657688Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:09.657700Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.659605Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:09.697287Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:09.709788Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:09.709812Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:26:09.729459Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:09.739338Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:26:09.741074Z  INFO local_candidate{attempt=3}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:26:09.758387Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:09.758405Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.768220Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:09.783096Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:26:09.783591Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:09.783599Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:09.784752Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:09.829272Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:26:09.837800Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:26:09.902973Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:26:09.903029Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:09.947097Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:26:10.171940Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:26:10.191170Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:10.191193Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:10.200230Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:10.217996Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:26:10.218657Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:10.218666Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:10.219908Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:10.291003Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:26:10.291040Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:10.308773Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:26:10.315243Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:26:10.360376Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:26:10.360414Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:10.383141Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:26:10.429989Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:26:10.431129Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:26:10.431252Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:26:10.431266Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:10.439494Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:26:10.456684Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:10.456714Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:10.496235Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:10.765620Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:26:10.772081Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:26:10.777315Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:26:10.777342Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:10.792378Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:10.792399Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:10.796555Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:26:10.819956Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:11.032692Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:11.073330Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:11.073360Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.088466Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:11.218993Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:26:11.261610Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:11.261642Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:26:11.317036Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:26:11.324399Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:26:11.347851Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:26:11.368250Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:26:11.368913Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:11.368928Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.369239Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:26:11.369260Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.371731Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:26:11.388261Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:26:11.388905Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:11.388917Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.390835Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:26:11.399563Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:26:11.408139Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:26:11.411433Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:26:11.422737Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:26:11.424546Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:26:11.436525Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:26:11.460776Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:26:11.461309Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:26:11.462164Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:26:11.462177Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.465682Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:26:11.480867Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:11.485539Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:26:11.486307Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:26:11.486322Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.488395Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:26:11.495312Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:11.495332Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.509835Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:11.516384Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:26:11.517873Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:26:11.517892Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.520452Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:26:11.534846Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:26:11.535418Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:26:11.535431Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.537339Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:26:11.552139Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:26:11.552707Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:26:11.552733Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.554462Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:26:11.567429Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:26:11.631846Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:11.659241Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:26:11.659285Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:11.673014Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:11.673041Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.688889Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:11.698775Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:26:11.724878Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:11.732168Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:11.732188Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:26:11.744296Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:11.789618Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:26:11.820968Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:11.820991Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.863861Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:26:11.889242Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:26:11.889753Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:11.889760Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.891196Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:26:11.902984Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:26:11.903435Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:11.903448Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:11.904785Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:26:11.950932Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:26:11.961033Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:26:11.977872Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:26:12.038891Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:26:12.038921Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:26:12.088763Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:12.111242Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:12.111270Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.126531Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:12.136728Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:26:12.151110Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:26:12.151138Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=13 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:12.171809Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:26:12.172287Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:12.172298Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.174048Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:26:12.180868Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:26:12.183950Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:26:12.184333Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:12.184342Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.185397Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:26:12.190768Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:26:12.201491Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:26:12.202083Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:26:12.202089Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.202602Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:26:12.202620Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.203365Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:26:12.223060Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:26:12.293427Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=13 tile=79 row_words=1051 horizon=6343
2026-09-11T21:26:12.327075Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:26:12.331495Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:26:12.337226Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:26:12.338382Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:12.345181Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:12.345197Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:26:12.349400Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:26:12.349977Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:12.349985Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.351516Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:26:12.355618Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:12.360225Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:26:12.365509Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:26:12.365524Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.371053Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:26:12.372539Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:26:12.385086Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:26:12.385221Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:26:12.385662Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:26:12.385673Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:12.385678Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.385681Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.386961Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:12.386964Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:26:12.410584Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:26:12.437817Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:26:12.450406Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:26:12.455496Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:26:12.455525Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.458144Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:12.505414Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:12.505453Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.522249Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:26:12.535399Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:12.551269Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:26:12.551311Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:12.564456Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:26:12.587354Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:26:12.604680Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:26:12.629700Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:12.629724Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:26:12.661599Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:26:12.661639Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.662083Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:26:12.691093Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:26:12.692005Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:26:12.692019Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:26:12.694301Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:26:12.709121Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:26:12.709727Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:26:12.709735Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:26:12.711222Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:26:12.728348Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:26:12.755456Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:26:12.764921Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:26:12.768410Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:26:12.810130Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:26:12.827318Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:26:12.827345Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.831366Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:12.831386Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.842386Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:12.862910Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:26:12.863647Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:12.863659Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.865302Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:12.916552Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:26:12.955738Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:12.955935Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:26:12.956653Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:12.956667Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.959154Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:26:12.978972Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:12.979000Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:12.993228Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:26:12.995490Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:13.075613Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:26:13.075649Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:13.100191Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:26:13.154249Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:26:13.192816Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:26:13.192849Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:13.207036Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:26:13.207860Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:26:13.214197Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:13.221146Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:13.221162Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:26:13.232126Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:13.232145Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:26:13.232481Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:13.246282Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:26:13.247320Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:26:13.247333Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:13.254113Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:26:13.264572Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:26:13.297710Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:26:13.297758Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:13.299590Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:26:13.300655Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:26:13.300671Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:26:13.303029Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:26:13.308133Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:26:13.318596Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:26:13.319251Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:26:13.319260Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:26:13.320802Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:26:13.365378Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:26:13.374720Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:26:13.383164Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:26:13.410232Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:26:13.410254Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:26:13.415903Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:26:13.447108Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:26:13.447140Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:13.447833Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:26:13.454490Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:26:13.477116Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:13.477138Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:13.508103Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:13.509916Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:26:13.540312Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:26:13.552680Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:26:13.552704Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:13.570612Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:26:13.603276Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:26:13.664495Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:26:13.669879Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:26:13.669901Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:13.676128Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:26:13.685542Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:26:13.688036Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:26:13.689094Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:26:13.689878Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:26:13.702110Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:26:13.702135Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:13.831472Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:26:13.870642Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:26:13.870666Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:13.897015Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:26:13.911371Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:26:14.047641Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:14.088472Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:14.088498Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:14.103332Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:14.141457Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:26:14.167369Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:14.167397Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:26:14.203920Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:26:14.235462Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:26:14.236393Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:26:14.236407Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:26:14.239232Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:26:14.240602Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:26:14.240637Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:14.255267Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:26:14.255917Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:26:14.255924Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:26:14.257659Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:26:14.285095Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:26:14.315804Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:26:14.326720Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:26:14.357860Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:26:14.359685Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:26:14.359710Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:14.363471Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:26:14.388316Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:26:14.389390Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:26:14.389405Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:14.392178Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:26:14.408716Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:26:14.409323Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:14.409335Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:14.411340Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:26:14.434112Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:26:14.434131Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:14.435873Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:26:14.436496Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:26:14.463029Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:14.463049Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:14.497828Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:26:14.501502Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:14.518242Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:14.518260Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:14.519350Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:26:14.519803Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:14.519810Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:14.521035Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:26:14.531735Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:14.531876Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:26:14.532295Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:14.532303Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:14.533467Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:26:14.581586Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:26:14.591194Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:26:14.739723Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:14.746448Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:14.746467Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:26:14.757021Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:14.799476Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=40 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:26:14.832309Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:14.832337Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:14.843938Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:14.871244Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:14.871274Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:14.872808Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:15.101864Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:26:15.101904Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:15.110625Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:26:15.147426Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:26:15.196543Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:26:15.196576Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:15.260271Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:26:15.290238Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:26:15.290779Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:15.290788Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:15.292167Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:26:15.313893Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:26:15.328295Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:26:15.328706Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:15.328715Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:15.330608Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:26:15.341226Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:26:15.341621Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:15.341629Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:15.342811Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:26:15.348587Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:26:15.360971Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:26:15.361654Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:26:15.361665Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:15.363002Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:26:15.507685Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:15.507717Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:15.535997Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:15.585375Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:26:15.610147Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:15.610167Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:26:15.643327Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:26:15.674495Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:26:15.675584Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:26:15.675598Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:26:15.677813Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:26:15.693480Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:26:15.694100Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:26:15.694109Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:26:15.695616Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:26:15.741889Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:26:15.754688Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:26:16.111048Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:26:16.177542Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:26:16.177576Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:16.228730Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:26:16.397667Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:26:16.397699Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:16.458074Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:26:16.481120Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:26:16.496780Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:26:16.496800Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:16.522444Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:26:16.601422Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:26:16.615368Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:26:16.648426Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:26:16.687383Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:26:16.687420Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:16.699382Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:26:16.699408Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:26:16.736437Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:26:16.736467Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:16.739501Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:26:16.749385Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:26:16.802161Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:26:16.824573Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:26:16.848362Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:26:16.848386Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:16.916526Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:26:16.924094Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:26:16.924130Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:16.934303Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:26:16.944956Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:26:16.947687Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:26:16.948857Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:26:16.949718Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:26:16.956514Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:26:16.969566Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:26:16.969950Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:16.969958Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:16.971494Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:26:16.981509Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:26:16.981884Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:16.981891Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:16.982946Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:26:16.988304Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:26:16.993252Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:26:16.993751Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:26:16.995385Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:26:17.002300Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:26:17.003460Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:26:17.007822Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:26:17.011102Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:26:17.025517Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:26:17.025950Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:26:17.025959Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.027977Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:26:17.039642Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:26:17.040104Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:26:17.040115Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.041365Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:26:17.056463Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:26:17.056677Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:26:17.057310Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:26:17.057323Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.058745Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:26:17.066760Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:26:17.067084Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:26:17.067090Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.068173Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:26:17.073267Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:26:17.073288Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.076303Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:26:17.076606Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:26:17.076612Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.077501Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:26:17.085243Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:26:17.149637Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:26:17.149679Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.231539Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:26:17.231542Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:26:17.238302Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:26:17.238322Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.244464Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:26:17.267921Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:26:17.268827Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:26:17.268841Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.271283Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:26:17.274564Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:26:17.275217Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:26:17.275227Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.276993Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:26:17.277194Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:26:17.280978Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:26:17.285522Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:26:17.286306Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:26:17.288285Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:26:17.288625Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:17.288632Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.289775Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:26:17.294503Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:26:17.294900Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:26:17.294908Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.295955Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:26:17.312251Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:26:17.312268Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.341859Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:26:17.392788Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:26:17.395271Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:26:17.395303Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:17.451709Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:26:17.452481Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:17.452495Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.454439Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:26:17.461400Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:26:17.491618Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:26:17.491658Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=12 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:17.493472Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8137
2026-09-11T21:26:17.498762Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:26:17.503388Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:17.503411Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:17.504931Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:26:17.526084Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:26:17.526109Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:17.546516Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=45 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:26:17.553019Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:26:17.564397Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:17.564416Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:17.566100Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:26:17.567078Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:26:17.578148Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:17.578161Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:17.579115Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:26:17.590041Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:26:17.590062Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:26:17.596594Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:26:17.596610Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:17.597673Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:26:17.619466Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:26:18.100532Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:26:18.100570Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:18.135031Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:26:18.425923Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:26:18.477600Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:26:18.477630Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:18.497983Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:26:18.553032Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:26:18.554427Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:26:18.554446Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:18.563710Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:26:18.885684Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:26:18.885720Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:18.921676Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:26:18.940805Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:26:18.953107Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:26:18.953129Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:18.967133Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:26:18.967176Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:18.979698Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:26:19.027604Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:26:19.060976Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=39 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:26:19.065242Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:26:19.070651Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:26:19.070672Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:19.076310Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:26:19.107744Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=39 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:19.107777Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=39 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.119692Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=39 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:19.149398Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:26:19.151759Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=40 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:19.151789Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=40 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.154495Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=40 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:19.186049Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:26:19.186077Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.192428Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:26:19.206715Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:26:19.206737Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.219936Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=56 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:26:19.234074Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:19.234098Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.234975Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:26:19.236167Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:26:19.250185Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:19.250263Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.251987Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:26:19.276232Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=62 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:26:19.290830Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=64 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:26:19.305771Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:26:19.305786Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.307404Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:26:19.320182Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:26:19.320194Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.321099Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:26:19.339502Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:26:19.339516Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.340800Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:26:19.348862Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:26:19.348874Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.349788Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:26:19.392028Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:26:19.392051Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.392860Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:26:19.407343Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=70 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:26:19.595464Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:26:19.595512Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.610889Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:26:19.671918Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:26:19.698169Z  INFO local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:26:19.707881Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:26:19.707906Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:19.726710Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:26:19.743170Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:26:19.765263Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:26:19.766166Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:26:19.766180Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:19.772694Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:26:19.811748Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:26:19.811776Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.814244Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:26:19.814272Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:19.829361Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=41 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:19.829390Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=41 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.851643Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:26:19.851678Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=13 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.856371Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=41 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:19.857675Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:26:19.872030Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:26:19.887538Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=56 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:19.887557Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=56 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.889098Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=56 tile=866 row_words=10 horizon=471
2026-09-11T21:26:19.901040Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=57 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:19.901060Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=57 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.902464Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=57 tile=47 row_words=23 horizon=374
2026-09-11T21:26:19.918083Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:26:19.937125Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=61 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:26:19.954197Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=63 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:26:19.971355Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=64 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:26:19.971375Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=64 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.973310Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=64 tile=875 row_words=10 horizon=1112
2026-09-11T21:26:19.986690Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=65 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:26:19.986708Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=65 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:19.987760Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=65 tile=39 row_words=39 horizon=4006
2026-09-11T21:26:19.991188Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:26:19.991226Z  INFO local_candidate{attempt=3}: 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
2026-09-11T21:26:20.007597Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=66 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:26:20.007625Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=66 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.009149Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=66 tile=1104 row_words=41 horizon=172
2026-09-11T21:26:20.017681Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=67 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:26:20.017695Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=67 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.018768Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=13 tile=79 row_words=922 horizon=6894
2026-09-11T21:26:20.018839Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=67 tile=46 row_words=9 horizon=216
2026-09-11T21:26:20.062247Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=68 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:26:20.062277Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=68 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.063166Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=68 tile=0 row_words=1028 horizon=2206
2026-09-11T21:26:20.064171Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:26:20.076219Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:26:20.076239Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:20.079120Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=69 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:26:20.092149Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:26:20.094096Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:26:20.155125Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=71 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:26:20.155150Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=71 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.156408Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=71 tile=47 row_words=25 horizon=406
2026-09-11T21:26:20.183087Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:26:20.218171Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:20.218197Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:20.260929Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:26:20.260963Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.264542Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:26:20.284454Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:26:20.292749Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:26:20.293360Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:20.293371Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:20.295074Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:26:20.296722Z  INFO local_candidate{attempt=6}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:26:20.310007Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:26:20.310611Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:20.310625Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:20.312270Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:26:20.372454Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:26:20.389779Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:26:20.409295Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:26:20.409329Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=28 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.412403Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:26:20.412427Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.420770Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=14502
2026-09-11T21:26:20.461670Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:26:20.740576Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:26:20.744995Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:20.745025Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.765274Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:26:20.765304Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:26:20.782705Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:26:20.794541Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:26:20.814628Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:20.814657Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.816417Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:26:20.830928Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:20.830949Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:20.832639Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:26:20.944338Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:26:20.972987Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:20.973006Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:21.011601Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:26:21.036696Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:26:21.037320Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:21.037332Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:21.038786Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:26:21.100537Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=24 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:26:21.100560Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=24 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.102949Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=24 tile=723 row_words=30 horizon=2545
2026-09-11T21:26:21.116678Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:26:21.116713Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=27 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.128093Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=27 tile=136 row_words=181 horizon=8747
2026-09-11T21:26:21.209026Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:26:21.209067Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.219727Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:26:21.376842Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:26:21.376875Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.395726Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:26:21.399994Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:26:21.400023Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.409559Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:26:21.429480Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=46 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:21.429510Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=46 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.430654Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=46 tile=47 row_words=23 horizon=374
2026-09-11T21:26:21.447343Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:26:21.447380Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.449405Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=48 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:26:21.449427Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=48 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.450657Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=48 tile=14 row_words=49 horizon=5913
2026-09-11T21:26:21.471999Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:26:21.491767Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:26:21.491810Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.501133Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:26:21.666511Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:26:21.666554Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.676579Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:26:21.785655Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=42 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:26:21.785685Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=42 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.856660Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=42 tile=235 row_words=253 horizon=1463
2026-09-11T21:26:21.891360Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:26:21.891397Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.899020Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:26:21.899050Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.900121Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:21.900146Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=43 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.901933Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=43 tile=74 row_words=15 horizon=3625
2026-09-11T21:26:21.928079Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:26:21.934286Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:26:21.938101Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:26:21.944749Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=44 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:26:21.949041Z  INFO local_candidate{attempt=3}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:26:21.964885Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=45 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:21.964904Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=45 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:21.966597Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=45 tile=866 row_words=10 horizon=471
2026-09-11T21:26:22.083000Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:26:22.083040Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:22.102478Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:26:22.102514Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:22.179521Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:26:22.360334Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:26:22.458529Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=55 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:26:22.489541Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:26:22.513066Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:26:22.513085Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:26:22.540845Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:26:22.758806Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:26:22.853713Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=49 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:26:22.853752Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=49 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:22.875919Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:26:22.875950Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:22.913059Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=49 tile=34 row_words=731 horizon=5250
2026-09-11T21:26:22.924770Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:26:23.084256Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=50 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:26:23.084288Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=50 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:23.090803Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=50 tile=32 row_words=134 horizon=7129
2026-09-11T21:26:23.117217Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:26:23.118472Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:26:23.118491Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:23.120911Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:26:23.135773Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:26:23.138055Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:26:23.138783Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:26:23.138794Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:23.140659Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:26:23.201025Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:26:23.201056Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:26:23.300062Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:26:23.335368Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:26:23.335827Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:23.335834Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:23.337182Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:26:23.353533Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:26:23.353551Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=12 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:23.355055Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6280
2026-09-11T21:26:23.407602Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:26:23.449072Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:26:23.449104Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:23.482769Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:26:24.029849Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:26:24.029881Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:24.236444Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:26:24.249401Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:26:24.249440Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=13 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:24.274063Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:26:24.274098Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:24.292940Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:26:24.292971Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:24.294025Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:26:24.312845Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:26:24.386117Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=13 tile=159 row_words=1160 horizon=8593
2026-09-11T21:26:24.636853Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=70 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:26:24.636895Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=70 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:24.794839Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:26:24.818592Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:26:24.818617Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:24.824216Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=70 tile=324 row_words=455 horizon=1906
2026-09-11T21:26:24.839729Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:26:24.847373Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:26:24.911558Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:26:24.911584Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:26:24.911832Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:26:24.938809Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:26:24.938844Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:24.963173Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:26:24.988447Z  INFO local_candidate{attempt=3}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:26:24.993547Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:26:24.993566Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:24.999473Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:26:25.028799Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:26:25.067569Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:26:25.068111Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:25.068118Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:25.069612Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:26:25.093525Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:26:25.093546Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=12 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:25.094775Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8137
2026-09-11T21:26:25.108676Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:26:25.114015Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:26:25.114031Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:25.119772Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:26:25.130247Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:26:25.162420Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:26:25.162448Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:25.191922Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:26:25.191946Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:25.194739Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:26:25.234235Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:26:25.234261Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:25.236771Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:26:25.239000Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:26:25.256273Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:26:25.256289Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=31 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:25.258009Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=5448
2026-09-11T21:26:25.896702Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:26:25.896744Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:25.932004Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:26:25.957918Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:26:25.957943Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:25.986266Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:26:26.007864Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:26:26.008400Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:26.008410Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:26.009614Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:26:26.014137Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:26:26.014165Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.033831Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:26:26.033852Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.036411Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:26:26.043801Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:26:26.055477Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:26:26.055495Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.057374Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:26:26.073311Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:26.073331Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.074735Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:26:26.087555Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:26.087567Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.088808Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:26.310715Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:26:26.327008Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:26:26.327038Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=34 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.404020Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=34 tile=707 row_words=445 horizon=14348
2026-09-11T21:26:26.442589Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:26.442621Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=36 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.443959Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=36 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:26.455362Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:26:26.455839Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:26.455846Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:26.457143Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:26:26.585168Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:26:26.598806Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:26:26.598861Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.673167Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:26:26.673197Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=13 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.675192Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:26:26.675235Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.696742Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:26:26.696768Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:26.707763Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:26:26.765001Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:26:26.779361Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=13 tile=154 row_words=925 horizon=6751
2026-09-11T21:26:26.895821Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:26:26.895853Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:26.916552Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:26:26.924929Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=35 tile=1095 row_words=136 horizon=822
2026-09-11T21:26:26.937134Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:26:26.957121Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:26:26.957139Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:26.983611Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:26:27.272683Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:26:27.296633Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:26:27.296655Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:27.317284Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:26:27.536347Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:26:27.536391Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:27.645230Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:26:27.890649Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:26:27.890699Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:28.123915Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:26:28.270110Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:26:28.270150Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:28.300802Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:26:28.456935Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:26:28.456972Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:28.479804Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:26:28.481919Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:26:28.481946Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=34 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:28.570971Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=34 tile=707 row_words=445 horizon=14301
2026-09-11T21:26:28.660569Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:26:28.660609Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:28.722709Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:26:28.722740Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=33 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:28.968391Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:26:28.996189Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:26:28.996235Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:29.033364Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:26:29.033392Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:29.036642Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:26:29.074488Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:26:29.083447Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:26:29.134791Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=33 tile=109 row_words=1528 horizon=14869
2026-09-11T21:26:29.174230Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:26:29.174261Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=35 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:29.257634Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=35 tile=707 row_words=445 horizon=14301
2026-09-11T21:26:30.024895Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:26:30.024927Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=13 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:30.160311Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=13 tile=159 row_words=1160 horizon=8593
2026-09-11T21:26:31.200102Z  INFO local_candidate{attempt=3}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:26:31.200142Z  INFO local_candidate{attempt=3}: optimized physical exchange schedule phase=33 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:31.551604Z  INFO local_candidate{attempt=3}: finished large physical exchange phase phase=33 tile=109 row_words=1528 horizon=14869
2026-09-11T21:26:31.663904Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-11T21:26:31.667369Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:26:31.673371Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:26:31.816652Z  INFO local_candidate{attempt=3}: exchange table and repeat patch storage exchange_table_bytes=40768 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:26:33.438951Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=98 success=true
2026-09-11T21:26:33.438984Z  INFO local_candidate{attempt=3}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=15144 exchange_table_bytes=40768 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:26:33.439000Z  INFO local_candidate{attempt=3}: allocated package support memory linked_end=386240 profile_bytes=1072 exchange_table_bytes=40768 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=15144 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525360, 949168)]
2026-09-11T21:26:33.876841Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=437 success=true
2026-09-11T21:26:33.894289Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:26:33.894789Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:33.894798Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:33.896414Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:26:33.904294Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:26:33.904322Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:33.904768Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:26:33.905451Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8139
2026-09-11T21:26:33.905903Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:26:33.905914Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:26:33.906937Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:26:33.907365Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:33.907372Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:33.908527Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:26:33.908686Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:26:33.923342Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:26:33.923977Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:26:33.923986Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:26:33.925612Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:26:33.927810Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:26:33.937413Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:26:33.949857Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:26:33.952969Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:26:33.959141Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:26:33.961980Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:26:33.994805Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:26:33.994836Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:33.999993Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:26:34.000597Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:26:34.001475Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:34.001504Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.003582Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:26:34.013788Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:26:34.014197Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:34.014216Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.015401Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:26:34.020415Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:26:34.025146Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:26:34.027248Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:26:34.034134Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:26:34.035184Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:26:34.043365Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:26:34.055996Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:26:34.056488Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:26:34.056498Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.058392Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:26:34.068406Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:26:34.068860Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:26:34.068867Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.069965Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:26:34.090224Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:26:34.091060Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:26:34.091072Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.092421Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:26:34.100464Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:26:34.100796Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:26:34.100803Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.101946Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:26:34.109586Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:26:34.109889Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:26:34.109894Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.110721Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:26:34.118294Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:26:34.141038Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:26:34.163745Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:26:34.163764Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:26:34.189101Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:26:34.200236Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:34.206491Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:26:34.206868Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:34.206876Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.207787Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:26:34.211915Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:34.211941Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:26:34.212704Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:26:34.222180Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:26:34.222622Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:26:34.222630Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.223696Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:26:34.229991Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:34.244255Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:26:34.250233Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:26:34.256978Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:26:34.289465Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:26:34.309763Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:34.309781Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.320374Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:34.340133Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:26:34.340792Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:34.340803Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.342695Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:34.362477Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:26:34.385111Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:26:34.385138Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.404306Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:26:34.454734Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:26:34.461517Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:26:34.461537Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.469643Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:26:34.493701Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:26:34.493731Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:34.503262Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=139 row_words=185 horizon=10717
2026-09-11T21:26:34.712407Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:26:34.723396Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:26:34.723421Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:34.732108Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:34.732128Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.739788Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:26:34.756559Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:26:34.757040Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:34.757054Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.758747Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:26:34.763038Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:26:34.780998Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:26:34.783292Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:26:34.783768Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:34.783776Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.785117Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:26:34.794317Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:26:34.794724Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:34.794732Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.796560Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:26:34.865906Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:26:34.881947Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:26:34.881986Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.897070Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:26:34.909369Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:26:34.920817Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:34.920836Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:34.950073Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:35.143851Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:26:35.143901Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=34 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:35.363009Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:26:35.395596Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:26:35.395623Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:35.452550Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:26:35.560069Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:26:35.592665Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:26:35.598762Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:26:35.598786Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:35.605320Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:26:35.607846Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:35.607868Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:26:35.613769Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:26:35.615807Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:26:35.616691Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:26:35.617338Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:26:35.623832Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:26:35.633777Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:26:35.634149Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:26:35.634158Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:35.635102Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:26:35.642437Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:26:35.654157Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:26:35.654859Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:26:35.654871Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:35.657324Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:26:35.667660Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:26:35.668379Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:26:35.668392Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:35.670247Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:26:35.672806Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=34 tile=109 row_words=1528 horizon=14869
2026-09-11T21:26:35.681763Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:26:35.682187Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:35.682192Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:35.683607Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:26:35.694346Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:26:35.694781Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:35.694789Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:35.696003Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:35.718467Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:26:35.718492Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:35.747191Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:26:35.929231Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:26:35.954629Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:26:35.954665Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:35.963191Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:26:35.963226Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:35.990456Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:26:36.004130Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:26:36.231567Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:26:36.307230Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:26:36.307254Z  INFO local_candidate{attempt=3}: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
2026-09-11T21:26:36.390181Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:26:36.400999Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:26:36.445831Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:26:36.445861Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:36.510110Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:26:36.878005Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:26:36.903006Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:26:36.926538Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:26:36.926559Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:36.933527Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:26:36.933548Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:36.950391Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:26:36.951429Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:26:37.039712Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:26:37.126240Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:26:37.126272Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:37.189702Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:26:37.245100Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:26:37.328429Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:26:37.328463Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:37.470198Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:26:38.265515Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:26:38.265549Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:38.310933Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:26:38.334892Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=712 row_words=446 horizon=14529
2026-09-11T21:26:38.412535Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:26:38.412559Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:38.587785Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:26:38.970993Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:26:38.971030Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:39.089182Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=149 row_words=1113 horizon=8617
2026-09-11T21:26:40.318788Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:26:40.419807Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:26:40.419832Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:40.460364Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:26:40.510030Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-11T21:26:40.513253Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:26:40.518954Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:26:40.653581Z  INFO local_candidate{attempt=4}: exchange table and repeat patch storage exchange_table_bytes=40304 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:26:42.156593Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=91 success=true
2026-09-11T21:26:42.156629Z  INFO local_candidate{attempt=4}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=15020 exchange_table_bytes=40304 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:26:42.156642Z  INFO local_candidate{attempt=4}: allocated package support memory linked_end=386240 profile_bytes=1064 exchange_table_bytes=40304 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=15020 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525352, 949168)]
2026-09-11T21:26:42.561605Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=404 success=true
2026-09-11T21:26:42.573101Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:26:42.573738Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:26:42.574161Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=56 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:42.574171Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=56 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.575664Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=56 tile=866 row_words=10 horizon=471
2026-09-11T21:26:42.576023Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:26:42.576705Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:26:42.577166Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:26:42.577254Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:42.577269Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.578026Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:26:42.578565Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=47 row_words=23 horizon=374
2026-09-11T21:26:42.584607Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:26:42.584772Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:26:42.585109Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:42.585118Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.585441Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:26:42.585567Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:26:42.585581Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:26:42.586058Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=47 row_words=23 horizon=374
2026-09-11T21:26:42.586916Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:26:42.588122Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:26:42.590712Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:26:42.594873Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:26:42.595042Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:26:42.595892Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:26:42.595907Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.596706Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:26:42.601812Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:26:42.602367Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:26:42.602378Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.602387Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:26:42.603247Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:26:42.603289Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:26:42.603551Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=14 row_words=49 horizon=5913
2026-09-11T21:26:42.603860Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:26:42.603868Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:26:42.604233Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:26:42.605531Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:26:42.611057Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:26:42.614988Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:26:42.622882Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:26:42.623275Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:26:42.623285Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.624941Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:26:42.624959Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=875 row_words=10 horizon=1112
2026-09-11T21:26:42.634710Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:26:42.635091Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:26:42.635100Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.636241Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=39 row_words=39 horizon=4006
2026-09-11T21:26:42.647417Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:26:42.650065Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:26:42.650462Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:26:42.650479Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.650641Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:26:42.650651Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.651907Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=1104 row_words=41 horizon=172
2026-09-11T21:26:42.652419Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:26:42.653778Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=723 row_words=30 horizon=2545
2026-09-11T21:26:42.659182Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:26:42.659489Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:26:42.659497Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.660568Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=46 row_words=9 horizon=216
2026-09-11T21:26:42.661797Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:26:42.663807Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:26:42.667998Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:26:42.668294Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:26:42.668302Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.669092Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=0 row_words=1028 horizon=2206
2026-09-11T21:26:42.676169Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:26:42.703769Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:26:42.710941Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:26:42.710966Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.718802Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:26:42.740944Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:26:42.746668Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:26:42.746683Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.753057Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=32 row_words=134 horizon=7129
2026-09-11T21:26:42.790291Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:26:42.790324Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:42.806815Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:26:42.829670Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:26:42.850506Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:26:42.854520Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:26:42.854537Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:26:42.862147Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:26:42.862165Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:42.876832Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:26:42.881985Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:26:42.889255Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:26:42.891247Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:42.893397Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:26:42.898635Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:26:42.900282Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:42.900302Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:26:42.915999Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:42.937729Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:26:42.937756Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:42.944621Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=14502
2026-09-11T21:26:42.979324Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:26:43.002448Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:43.002490Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.015035Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:43.035743Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:26:43.036386Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:43.036398Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.038064Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:43.074265Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:26:43.102940Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:26:43.102967Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.116465Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:26:43.139883Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:26:43.140574Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:43.140587Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.142516Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:43.158549Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:26:43.159138Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:43.159148Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.161216Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=74 row_words=15 horizon=3625
2026-09-11T21:26:43.198315Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:26:43.216125Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:26:43.216682Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:43.216698Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.218882Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=866 row_words=10 horizon=471
2026-09-11T21:26:43.231179Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:26:43.233059Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:26:43.233647Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:26:43.233665Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.235315Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=47 row_words=25 horizon=406
2026-09-11T21:26:43.270565Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:26:43.270591Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.291630Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:26:43.637009Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:26:43.638909Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:26:43.665283Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:43.665314Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.671438Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:26:43.671466Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.694494Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:43.711888Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1095 row_words=136 horizon=822
2026-09-11T21:26:43.715120Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:26:43.715565Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:43.715576Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.716929Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:26:43.738321Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:26:43.738345Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:43.739492Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8139
2026-09-11T21:26:43.744583Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:26:43.745570Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:26:43.745584Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.748517Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:26:43.749847Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:26:43.750255Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:43.750263Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.751566Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:26:43.764939Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:26:43.765623Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:26:43.765635Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.767470Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=5448
2026-09-11T21:26:43.810110Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:26:43.848722Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:43.848758Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.863792Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:26:43.902255Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:26:43.902290Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:43.905017Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:26:43.938407Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:26:43.968974Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=34 row_words=731 horizon=5250
2026-09-11T21:26:43.989726Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:26:43.989768Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:44.024592Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:26:44.027422Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:44.068728Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:44.068760Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:44.085110Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:44.152980Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:26:44.186280Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:44.186320Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:26:44.234127Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:26:44.431638Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:26:44.452222Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:26:44.452246Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:44.471719Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:26:44.483466Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:44.498220Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:44.498249Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:44.510710Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:45.086288Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:26:45.103900Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:26:45.103931Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:45.139025Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:26:45.139065Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:45.177501Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:26:45.209713Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=235 row_words=253 horizon=1463
2026-09-11T21:26:45.260402Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:26:45.260440Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:26:45.350097Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:26:45.489815Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=162 row_words=1526 horizon=14751
2026-09-11T21:26:45.551186Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:26:45.551239Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:45.579278Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:26:45.966224Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:26:46.026382Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:26:46.026408Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:46.073198Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:26:46.454988Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:26:46.497067Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:26:46.497098Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:46.538080Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:26:46.538104Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:46.573717Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=712 row_words=447 horizon=14529
2026-09-11T21:26:46.688545Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:26:46.928862Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:26:46.928906Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:46.965316Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:26:46.980919Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:26:47.060614Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:26:47.060641Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:47.248148Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=324 row_words=455 horizon=1906
2026-09-11T21:26:48.431869Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:26:48.431902Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:48.558514Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=149 row_words=1113 horizon=8617
2026-09-11T21:26:49.549149Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:26:49.679608Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:26:49.679644Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:49.734715Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:26:54.031212Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:26:54.031247Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:54.449368Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=162 row_words=1526 horizon=14751
2026-09-11T21:26:54.535054Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=11973 success=true
2026-09-11T21:26:54.570567Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=38 success=true
2026-09-11T21:26:54.574001Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:26:54.577997Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=42 success=true
2026-09-11T21:26:54.580359Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:26:54.581469Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:26:54.588715Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:26:54.738557Z  INFO local_candidate{attempt=7}: exchange table and repeat patch storage exchange_table_bytes=39632 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:26:54.745602Z  INFO local_candidate{attempt=6}: exchange table and repeat patch storage exchange_table_bytes=39768 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:26:56.257787Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:56.303460Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:56.303482Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:56.320427Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:56.563391Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=236 success=true
2026-09-11T21:26:56.563426Z  INFO local_candidate{attempt=6}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9084 generated_code_bytes=15180 exchange_table_bytes=39768 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395392, 524288)]
2026-09-11T21:26:56.563432Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=240 success=true
2026-09-11T21:26:56.563441Z  INFO local_candidate{attempt=6}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=39768 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=15180 code_address=395392 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:26:56.563462Z  INFO local_candidate{attempt=7}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9084 generated_code_bytes=15180 exchange_table_bytes=39632 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395392, 524288)]
2026-09-11T21:26:56.563475Z  INFO local_candidate{attempt=7}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=39632 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=15180 code_address=395392 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:26:56.751896Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:56.773462Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:56.773499Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:56.792392Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:56.854795Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=51 success=true
2026-09-11T21:26:56.858344Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:26:56.866294Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:26:56.941087Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:57.008864Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:57.008902Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.015585Z  INFO local_candidate{attempt=5}: exchange table and repeat patch storage exchange_table_bytes=40272 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:26:57.033827Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:57.112854Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=549 success=true
2026-09-11T21:26:57.114224Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=550 success=true
2026-09-11T21:26:57.127417Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:26:57.127917Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:57.127924Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.127929Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:26:57.128517Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:57.128531Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.129244Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:26:57.129976Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:57.132315Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:26:57.132885Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:26:57.133644Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:57.133660Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.136620Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:26:57.139431Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:26:57.140654Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:57.140672Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.140797Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:26:57.141250Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:57.141259Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.142519Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:26:57.143742Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:57.146956Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:26:57.148592Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:26:57.148610Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:26:57.152312Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:26:57.152930Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:26:57.153505Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:57.153518Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.155183Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:26:57.160155Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:26:57.161151Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:26:57.161179Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.163363Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:26:57.164782Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:26:57.176862Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:26:57.177978Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:26:57.177995Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:26:57.180300Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:26:57.180448Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:26:57.180500Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:26:57.181051Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:26:57.181063Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.182880Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:26:57.184496Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:26:57.187498Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:26:57.188332Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:26:57.188350Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.190570Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:26:57.191276Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:26:57.194120Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:26:57.196735Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:26:57.197460Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:26:57.197474Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.199178Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:26:57.202373Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:26:57.204372Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:26:57.212633Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:26:57.216833Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:26:57.221935Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:26:57.223064Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:26:57.223081Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.223280Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:26:57.225178Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:26:57.232259Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:26:57.234376Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:26:57.237342Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:26:57.237853Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:26:57.237861Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.239557Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:26:57.251086Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:26:57.254854Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:26:57.255332Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:26:57.255351Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.256671Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:26:57.268012Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:26:57.282830Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:26:57.283843Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:26:57.283913Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.288540Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:26:57.433157Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:57.442629Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:57.442667Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:26:57.458437Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:26:57.460733Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:57.486106Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:26:57.486134Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:26:57.521044Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:26:57.550452Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:57.608564Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:57.608602Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.610236Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:26:57.628144Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:57.635867Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:26:57.635917Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:57.636535Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:57.636565Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.641438Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=23764 success=true
2026-09-11T21:26:57.650525Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:57.672736Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:26:57.749663Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:26:57.749698Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:57.764494Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:26:57.766636Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:26:57.787569Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:26:57.788222Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:57.788236Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.789901Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:26:57.807357Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:26:57.807383Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.828758Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:26:57.840421Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:26:57.841127Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:26:57.845224Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:26:57.849715Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:26:57.850382Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:26:57.870162Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:26:57.871619Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:26:57.871637Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.879245Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:26:57.898091Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:26:57.898749Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:26:57.898764Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.900078Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:26:57.912438Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:26:57.912949Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:57.912958Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:57.914721Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:26:57.938362Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:26:57.994841Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:26:57.994886Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:26:58.011084Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:26:58.079746Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:26:58.086505Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:26:58.086527Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.093160Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:26:58.102331Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:26:58.104650Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:26:58.105714Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:26:58.106294Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:26:58.106494Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:26:58.119762Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:26:58.132918Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:26:58.132940Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.141986Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:58.142012Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.146882Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:26:58.188335Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:58.218920Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:26:58.238721Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:26:58.240237Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:26:58.240275Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.240612Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:26:58.240629Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.244642Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:26:58.251875Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:26:58.272586Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:26:58.273516Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:26:58.273790Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:26:58.273804Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.274239Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:58.274251Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.275967Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:26:58.276784Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:26:58.517083Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:26:58.551599Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:26:58.551623Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.614458Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:26:58.680470Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:58.718536Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:26:58.722314Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:58.722342Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.738123Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:58.760173Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:26:58.760199Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.776553Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:26:58.802247Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:26:58.839379Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:58.839421Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:26:58.886904Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:26:58.888837Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:26:58.910102Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:26:58.910127Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:58.940137Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:26:58.992776Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:26:59.020541Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:26:59.020573Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.053350Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:26:59.103229Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:26:59.126585Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:26:59.126610Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.146931Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:59.149600Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:26:59.163024Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:59.163044Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.178138Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:59.190330Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:26:59.206073Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:26:59.206100Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.221849Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:26:59.302588Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:26:59.308312Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:26:59.308337Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.315119Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:26:59.330855Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:26:59.331359Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:59.331371Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.332779Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:26:59.348046Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:26:59.348730Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:26:59.348741Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.350398Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6280
2026-09-11T21:26:59.448696Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:26:59.456096Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:26:59.456115Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:26:59.467100Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:26:59.546699Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:26:59.608599Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:26:59.608628Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.672293Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:26:59.679621Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:26:59.715363Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:26:59.715395Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.743166Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:26:59.816526Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:26:59.860755Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1248 success=true
2026-09-11T21:26:59.860798Z  INFO local_candidate{attempt=5}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9084 generated_code_bytes=15132 exchange_table_bytes=40272 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395392, 524288)]
2026-09-11T21:26:59.860813Z  INFO local_candidate{attempt=5}: allocated package support memory linked_end=386240 profile_bytes=1076 exchange_table_bytes=40272 host_code_bytes=9084 host_data_bytes=6280 generated_code_bytes=15132 code_address=395392 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525364, 949168)]
2026-09-11T21:26:59.871091Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:26:59.871127Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.892689Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:26:59.918795Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:26:59.924972Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:26:59.925973Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:26:59.925985Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.927693Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:26:59.941078Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:26:59.941108Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.945418Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:26:59.946890Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:26:59.946908Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:26:59.956607Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:26:59.959880Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:26:59.970527Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:27:00.039145Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:27:00.039171Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:27:00.142423Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:27:00.162294Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:27:00.162332Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:00.182043Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:27:00.200548Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:27:00.250260Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:27:00.267017Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:27:00.267043Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.271824Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:27:00.271850Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:27:00.298636Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:27:00.323103Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:27:00.324924Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:27:00.324948Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:00.325977Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:27:00.332565Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:27:00.349694Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:00.349715Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:27:00.354812Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:27:00.357291Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:27:00.367252Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:27:00.367686Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:00.367696Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.369283Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:27:00.369570Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:27:00.369588Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.378993Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:27:00.379398Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:00.379413Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.380486Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:27:00.382808Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:27:00.385666Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:27:00.390561Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:27:00.390799Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:27:00.392480Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:27:00.399662Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:27:00.400759Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:27:00.407944Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:27:00.412753Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:27:00.413601Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:27:00.413614Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:27:00.416021Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:27:00.420738Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:27:00.421165Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:27:00.421174Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.423003Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:27:00.431559Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:27:00.432183Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:27:00.432192Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:27:00.433366Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:27:00.433732Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:27:00.433815Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:27:00.433824Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.434964Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:27:00.449552Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:27:00.450180Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:27:00.450190Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.451566Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:27:00.459404Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:27:00.459715Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:27:00.459722Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.460874Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:27:00.468653Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:27:00.468949Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:27:00.468955Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.469841Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:27:00.477617Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:27:00.478100Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:27:00.487403Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:27:00.648361Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:27:00.699066Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:27:00.699109Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.765712Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:27:00.789552Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=928 success=true
2026-09-11T21:27:00.794605Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:27:00.795109Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:00.795118Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.796728Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:27:00.818305Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:27:00.832389Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:27:00.832777Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:00.832788Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.834589Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:27:00.844592Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:27:00.844962Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:00.844977Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.846017Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:27:00.851365Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:27:00.861910Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:27:00.862456Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:27:00.862465Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:00.863808Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:27:01.303877Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:27:01.303923Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:01.356864Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:27:01.570002Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:27:01.573160Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:27:01.608794Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:01.608821Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:01.609260Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:27:01.609284Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:01.633869Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:27:01.658584Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:27:01.686608Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:27:01.687222Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:01.687234Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:01.688944Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:27:01.703977Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:27:01.704553Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:01.704564Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:01.706262Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:27:01.764951Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:27:01.777544Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:27:01.795169Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:27:01.795227Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:01.825691Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:27:01.829419Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:27:01.873963Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:27:01.886747Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:27:01.886774Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:01.986456Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:27:01.986480Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:01.990656Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=154 row_words=925 horizon=6751
2026-09-11T21:27:02.031776Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:27:02.032672Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:27:02.032688Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.035467Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:27:02.048488Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:27:02.054516Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:27:02.055429Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:27:02.055448Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.058283Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:27:02.085388Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:27:02.085419Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.135349Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:27:02.139305Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:27:02.144271Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:27:02.145389Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:27:02.167994Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:27:02.168477Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:02.168487Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.170159Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:27:02.181278Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:27:02.181689Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:02.181696Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.182988Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=13 row_words=21 horizon=2978
2026-09-11T21:27:02.184651Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:27:02.228290Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:27:02.238238Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:27:02.238773Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:27:02.252949Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:27:02.253522Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:02.253534Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.255446Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=866 row_words=10 horizon=471
2026-09-11T21:27:02.257306Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:27:02.263681Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:27:02.263697Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.265933Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:27:02.266345Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:02.266355Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.267531Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=47 row_words=23 horizon=374
2026-09-11T21:27:02.269373Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:27:02.271677Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:27:02.273128Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:27:02.277300Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:27:02.278510Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:27:02.279298Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:27:02.280265Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:27:02.280560Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:27:02.280921Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:27:02.288180Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:27:02.289401Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:27:02.300355Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:27:02.314312Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:27:02.314831Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:27:02.314842Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.315419Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:27:02.315440Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.316650Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=875 row_words=10 horizon=1112
2026-09-11T21:27:02.327508Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:27:02.328014Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:27:02.328023Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.329089Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=39 row_words=39 horizon=4006
2026-09-11T21:27:02.330636Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:27:02.342353Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:27:02.342381Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:02.344052Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:27:02.344749Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:27:02.344761Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.346121Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=1104 row_words=41 horizon=172
2026-09-11T21:27:02.353806Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:27:02.354106Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:27:02.354111Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.355180Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=46 row_words=9 horizon=216
2026-09-11T21:27:02.362878Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:27:02.363166Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:27:02.363172Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.363965Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=0 row_words=1028 horizon=2206
2026-09-11T21:27:02.371316Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:27:02.422969Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:27:02.452346Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:27:02.458037Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:27:02.458572Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:27:02.458586Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.459643Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:27:02.465028Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:27:02.468447Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:27:02.472871Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=76
2026-09-11T21:27:02.482897Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:27:02.483254Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:02.483263Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.484742Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=866 row_words=10 horizon=471
2026-09-11T21:27:02.493934Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:27:02.494275Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:02.494291Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.495226Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=47 row_words=23 horizon=374
2026-09-11T21:27:02.500085Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:27:02.506581Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:27:02.506662Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:02.509571Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:27:02.510005Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:27:02.510012Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.511107Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=14 row_words=49 horizon=5913
2026-09-11T21:27:02.515370Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:27:02.515387Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:27:02.518666Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:27:02.605878Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:27:02.607016Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:27:02.629683Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:27:02.629715Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.639447Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:27:02.639874Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:02.639883Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.640456Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=104 row_words=187 horizon=8266
2026-09-11T21:27:02.641148Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:27:02.655408Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:27:02.656015Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:27:02.656024Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.657511Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:27:02.661969Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:27:02.662624Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:02.662635Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.664245Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=146 row_words=20 horizon=8454
2026-09-11T21:27:02.722133Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:27:02.739623Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:27:02.739647Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.753605Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:27:02.859008Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:27:02.883386Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:27:02.883409Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:02.913400Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:27:02.958814Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:27:02.965007Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:27:02.965024Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:27:02.975334Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:27:03.233675Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:27:03.257162Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:27:03.257195Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:03.284542Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=1090 row_words=186 horizon=7433
2026-09-11T21:27:03.386185Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:27:03.435270Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8748 maximum_identical_destinations=1
2026-09-11T21:27:03.435297Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7565 selected_horizon=7565 endpoint_lower_bound=7008 lower_bound_gap=557 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:03.453071Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=137 row_words=278 horizon=7565
2026-09-11T21:27:03.499944Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:27:03.501163Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=2013 maximum_identical_destinations=1
2026-09-11T21:27:03.501185Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=2561 selected_horizon=2561 endpoint_lower_bound=1408 lower_bound_gap=1153 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:03.511731Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=100 row_words=23 horizon=2561
2026-09-11T21:27:03.717213Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:27:03.749918Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:27:03.749938Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:03.791523Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:27:03.808827Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=34 row_words=731 horizon=5250
2026-09-11T21:27:03.818538Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:03.818565Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:27:03.850578Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:27:03.879350Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:27:03.880223Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:27:03.880239Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:27:03.882524Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:27:03.897310Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:27:03.897915Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:27:03.897923Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:27:03.899373Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:27:03.912093Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:27:03.917830Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:27:03.931047Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:27:03.931067Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:03.943108Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:27:03.952162Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:27:03.952417Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=535 row_words=106 horizon=4485
2026-09-11T21:27:03.954190Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:27:03.959511Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=52 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:27:03.959533Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=52 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:03.966177Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=52 tile=32 row_words=134 horizon=7129
2026-09-11T21:27:03.974964Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:27:03.977093Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:27:03.978017Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:27:03.978684Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:27:04.005933Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:27:04.005956Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:04.166805Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:27:04.195487Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:27:04.195523Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:04.212125Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=127 row_words=165 horizon=16042
2026-09-11T21:27:04.337430Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:27:04.337461Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:04.344558Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1428 row_words=47 horizon=11896
2026-09-11T21:27:04.461367Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:27:04.474250Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:27:04.480943Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:27:04.480962Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:27:04.508630Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:27:04.523698Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:27:04.523719Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:04.588750Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=235 row_words=253 horizon=1463
2026-09-11T21:27:04.617575Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:27:04.618099Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:04.618108Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:04.619509Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=74 row_words=15 horizon=3625
2026-09-11T21:27:04.641301Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:27:04.687335Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:27:04.796076Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:27:04.796101Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:04.993245Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:27:05.049259Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:27:05.049889Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=73 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:27:05.049900Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=73 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:05.050951Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=73 tile=47 row_words=25 horizon=406
2026-09-11T21:27:05.160413Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:27:05.197488Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:05.197520Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:05.217340Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:27:05.245990Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=356 row_words=177 horizon=850
2026-09-11T21:27:05.274612Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:27:05.275233Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:05.275246Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:05.276947Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=22 row_words=23 horizon=2909
2026-09-11T21:27:05.277351Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:27:05.277373Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:05.292058Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:27:05.292633Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:05.292644Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:05.294339Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=13 row_words=20 horizon=2969
2026-09-11T21:27:05.355309Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:27:05.368126Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-11T21:27:05.380179Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=922 horizon=6894
2026-09-11T21:27:05.439422Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:27:05.505301Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:27:05.505341Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:05.508187Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:27:05.508232Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:05.554317Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:27:05.584590Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:27:06.019079Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:27:06.056954Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:27:06.056979Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:06.079862Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=480 row_words=519 horizon=10141
2026-09-11T21:27:06.092961Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:27:06.092997Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:06.104006Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=139 row_words=185 horizon=10717
2026-09-11T21:27:06.125485Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:27:06.126078Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:06.126089Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:06.127820Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:27:06.147943Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:27:06.148866Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:27:06.148888Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:06.151010Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:27:06.247996Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:27:06.422866Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:27:06.422901Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:06.647931Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:27:06.718078Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:27:06.745071Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:27:06.811924Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:27:06.811951Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:27:06.828569Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:27:06.828601Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:06.906213Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:27:07.020367Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=324 row_words=455 horizon=1906
2026-09-11T21:27:07.076635Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:27:07.077236Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:07.077247Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.078669Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=114 row_words=24 horizon=2834
2026-09-11T21:27:07.275172Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:27:07.339489Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:27:07.339512Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.348562Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:27:07.392882Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:27:07.416536Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:27:07.416574Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:07.435698Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:27:07.436898Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:27:07.436914Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.439295Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1452 row_words=15 horizon=3578
2026-09-11T21:27:07.446966Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:27:07.455474Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:27:07.456126Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:27:07.456137Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.458104Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=684 row_words=18 horizon=4463
2026-09-11T21:27:07.462907Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:27:07.462930Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:07.490558Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:27:07.490595Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:07.511836Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:27:07.529114Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:27:07.624193Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13089 success=true
2026-09-11T21:27:07.648577Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:27:07.658362Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:27:07.662175Z  INFO local_candidate{attempt=4}: costed final placed program final_cycles=14036316 final_exchange=6418397
2026-09-11T21:27:07.663651Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:27:07.663669Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.669019Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:27:07.670046Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:27:07.673922Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:27:07.673939Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.674841Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:27:07.674857Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.679990Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:27:07.702259Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1095 row_words=135 horizon=822
2026-09-11T21:27:07.784089Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:27:07.784137Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:07.819863Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:27:07.900379Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:27:07.916931Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:27:07.923903Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:27:07.937835Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:27:07.937857Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.942805Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:27:07.942827Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:07.959592Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:27:07.962110Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:27:07.991351Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:27:07.991379Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:08.156303Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=553 row_words=658 horizon=2731
2026-09-11T21:27:08.250963Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:27:08.434889Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:27:08.434934Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:08.519309Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:27:08.521176Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:27:08.569626Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:27:08.569659Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:08.691490Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=1051 horizon=6343
2026-09-11T21:27:08.809809Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=224 success=true
2026-09-11T21:27:08.896004Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=86 success=true
2026-09-11T21:27:09.058022Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:27:09.058058Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:09.087504Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:27:09.343134Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=406 success=true
2026-09-11T21:27:10.823167Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:27:10.944270Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:27:10.944301Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:10.991181Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:27:11.105624Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:27:11.105660Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:11.470501Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:27:11.606297Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:27:11.606339Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:11.707577Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=712 row_words=446 horizon=14529
2026-09-11T21:27:12.666787Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:27:12.666823Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:13.013091Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:27:13.076931Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=15964 success=true
2026-09-11T21:27:16.975445Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:27:16.975483Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14755 selected_horizon=14755 endpoint_lower_bound=6016 lower_bound_gap=8739 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:17.338920Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=109 row_words=1526 horizon=14755
2026-09-11T21:27:17.411567Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=16621 success=true
2026-09-11T21:27:17.411846Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=20297 success=true
2026-09-11T21:27:20.935324Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=23293 success=true
2026-09-11T21:27:20.979137Z  INFO local_candidate{attempt=3}: costed final placed program final_cycles=14058753 final_exchange=6503042
2026-09-11T21:27:21.799589Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=8722 success=true
2026-09-11T21:27:21.824101Z  INFO local_candidate{attempt=6}: costed final placed program final_cycles=14103870 final_exchange=6478877
2026-09-11T21:27:22.036129Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=175 success=true
2026-09-11T21:27:22.131373Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=95 success=true
2026-09-11T21:27:22.559948Z  INFO local_candidate{attempt=3}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=386 success=true
2026-09-11T21:27:22.831410Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=149 success=true
2026-09-11T21:27:22.915882Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=84 success=true
2026-09-11T21:27:23.322881Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=364 success=true
2026-09-11T21:27:26.948740Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9536 success=true
2026-09-11T21:27:26.988854Z  INFO local_candidate{attempt=7}: costed final placed program final_cycles=14123283 final_exchange=6498290
2026-09-11T21:27:28.026278Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=152 success=true
2026-09-11T21:27:28.116168Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=89 success=true
2026-09-11T21:27:28.264609Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10852 success=true
2026-09-11T21:27:28.305798Z  INFO local_candidate{attempt=5}: costed final placed program final_cycles=14088210 final_exchange=6483413
2026-09-11T21:27:28.535509Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=373 success=true
2026-09-11T21:27:29.765372Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=176 success=true
2026-09-11T21:27:29.890943Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=125 success=true
2026-09-11T21:27:30.541427Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=592 success=true
2026-09-11T21:27:32.041275Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=3 before=14224587 after=14058753 changed_operations=[] opened_boundaries=[]
2026-09-11T21:27:35.731306Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=4 threads=16
2026-09-11T21:27:41.033660Z  INFO local_candidate{attempt=5}: screened exchange table geometry expansion_ms=4339 expansion_and_footprint_ms=5302 estimated_row_bytes=71744 heuristic_row_bytes=142744 geometry_fragments_per_tile=8015 fragment_limit=16384
2026-09-11T21:27:41.152090Z  INFO local_candidate{attempt=5}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:27:41.633464Z  INFO local_candidate{attempt=4}: screened exchange table geometry expansion_ms=4896 expansion_and_footprint_ms=5902 estimated_row_bytes=71960 heuristic_row_bytes=143708 geometry_fragments_per_tile=8042 fragment_limit=16384
2026-09-11T21:27:41.676640Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:27:41.681998Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:27:41.683286Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:27:41.684477Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:27:41.685072Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:41.685084Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.686675Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:27:41.688469Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:27:41.689191Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:27:41.689218Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.690059Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:27:41.690574Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:27:41.690686Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:27:41.691508Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:41.691521Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.691701Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:27:41.691829Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:27:41.692735Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:41.692754Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.693431Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:27:41.693835Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:27:41.695641Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:27:41.702788Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:27:41.705813Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:27:41.706531Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:27:41.706542Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.707636Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:27:41.708000Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:27:41.708414Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:27:41.708432Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.710441Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:27:41.713317Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:27:41.714000Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:41.714013Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.715924Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:27:41.723599Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:27:41.724375Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:27:41.724394Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.726238Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:27:41.726245Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:27:41.726958Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:27:41.726973Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.729552Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:27:41.739394Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:27:41.739866Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:27:41.739875Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.741335Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:27:41.742074Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:27:41.747691Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:27:41.754948Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:27:41.757966Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:27:41.758614Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:41.758625Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:41.760807Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:27:41.762808Z  INFO local_candidate{attempt=4}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:27:41.763313Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:27:41.763953Z  INFO local_candidate{attempt=6}: screened exchange table geometry expansion_ms=4980 expansion_and_footprint_ms=6032 estimated_row_bytes=70208 heuristic_row_bytes=142744 geometry_fragments_per_tile=7823 fragment_limit=16384
2026-09-11T21:27:41.764931Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:27:41.764958Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:41.766622Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:27:41.767111Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:27:41.770660Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:27:41.773876Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:27:41.775031Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:27:41.775874Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:27:41.782871Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:27:41.807176Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:27:41.808063Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:27:41.808075Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:27:41.810691Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:27:41.828565Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:27:41.829398Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:27:41.829410Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:27:41.831437Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:27:41.882716Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:27:41.882753Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:41.883864Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:27:41.893786Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:27:41.894484Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:27:41.927811Z  INFO local_candidate{attempt=6}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:27:41.999893Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:27:42.027347Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:27:42.027384Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:27:42.060226Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:27:42.205553Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:27:42.228485Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:27:42.228509Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:42.240691Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:27:42.263323Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:27:42.264090Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:42.264099Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:42.265854Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:27:42.287861Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:27:42.288814Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:27:42.288827Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:42.291429Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:27:42.308755Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:27:42.309465Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:27:42.309476Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:42.311324Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:27:42.342038Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:27:42.369052Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:27:42.369080Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:42.385870Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:27:42.385901Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:42.396719Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:27:42.405478Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:27:42.659965Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:27:42.660002Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:42.679107Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:27:43.206570Z  INFO local_candidate{attempt=7}: screened exchange table geometry expansion_ms=6113 expansion_and_footprint_ms=7475 estimated_row_bytes=70208 heuristic_row_bytes=142744 geometry_fragments_per_tile=7823 fragment_limit=16384
2026-09-11T21:27:43.244499Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:27:43.290340Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:27:43.290377Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:43.307916Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:27:43.372320Z  INFO local_candidate{attempt=7}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:27:43.463718Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:27:43.508775Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:27:43.508812Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:43.599696Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:27:43.739111Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:27:43.754884Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:27:43.754913Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:43.770494Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:27:43.826644Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:27:43.833826Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:27:43.833868Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:43.843073Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:27:43.902544Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:27:43.943429Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:27:43.943458Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:43.975155Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:27:44.049252Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:27:44.056322Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:27:44.056341Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:27:44.067415Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:27:44.251698Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:27:44.327116Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:27:44.327148Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.335502Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:27:44.395953Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:27:44.395991Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.400884Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:27:44.471087Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:27:44.506866Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:27:44.507477Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:44.507489Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.509122Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:27:44.529962Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:27:44.537041Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:27:44.552377Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:27:44.552812Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:44.552822Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.554432Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:27:44.556611Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:27:44.556631Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.586310Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:27:44.617541Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:27:44.628777Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:27:44.679399Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:27:44.680466Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:27:44.723680Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:27:44.723712Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.748308Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:27:44.763058Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:27:44.763091Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:27:44.771108Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:27:44.786637Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:27:44.793007Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:27:44.793032Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.799116Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:27:44.799138Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.801165Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:27:44.821989Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:27:44.822655Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:44.822677Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.824917Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:27:44.830810Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:27:44.838677Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:27:44.839231Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:44.839248Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.840758Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:27:44.848280Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:27:44.854307Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:27:44.854820Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:44.854826Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.855442Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:27:44.856189Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:27:44.858163Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:27:44.867889Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:27:44.868003Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:27:44.868488Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:44.868498Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.869489Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:27:44.869891Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:27:44.871846Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:27:44.880317Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:27:44.901530Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:27:44.902516Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:27:44.902543Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.906639Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:27:44.914619Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:27:44.915183Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:44.915193Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.917508Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:27:44.921113Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:27:44.927159Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:27:44.928917Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:27:44.929351Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:44.929362Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.930583Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:27:44.931239Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:27:44.931905Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:27:44.931917Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.933535Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:27:44.936441Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:27:44.937022Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:27:44.941632Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:27:44.943585Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:27:44.950797Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:27:44.951898Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:27:44.953612Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:44.953630Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:27:44.957216Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:27:44.958162Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:27:44.958176Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.960250Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:27:44.960744Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:27:44.971764Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:27:44.972190Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:27:44.972197Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.973703Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:27:44.977884Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:27:44.978553Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:27:44.978574Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.981745Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:27:44.990907Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:27:44.991379Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:27:44.991389Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.992213Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:27:44.992631Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:27:44.997273Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:27:44.997781Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:27:44.997791Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:44.999180Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:27:45.003662Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:27:45.016581Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:27:45.017375Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:27:45.017389Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.019422Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:27:45.028680Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:27:45.029024Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:27:45.029030Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.030296Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:27:45.039292Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:27:45.039628Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:27:45.039633Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.040634Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:27:45.049106Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:27:45.050506Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:27:45.074530Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:27:45.074557Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.087281Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:27:45.102964Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:27:45.102994Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:45.111865Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:27:45.112619Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:45.112631Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.114893Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:27:45.147508Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:27:45.181504Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:27:45.182098Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:45.182109Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.183531Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:27:45.190389Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:27:45.190951Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:27:45.203228Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:27:45.203936Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:27:45.203947Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.205359Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:27:45.211494Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:27:45.211515Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.229726Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:27:45.316917Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:27:45.338657Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:27:45.338683Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.350749Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:27:45.374176Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:27:45.374898Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:45.374910Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.377106Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:27:45.470214Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:27:45.478658Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:27:45.478677Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:27:45.484818Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:27:45.491398Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:27:45.545120Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:27:45.545152Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.565815Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:27:45.742320Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:27:45.768037Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:27:45.768069Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:45.773969Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:27:45.774008Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=13 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:45.802544Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:27:45.966434Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=13 tile=79 row_words=1051 horizon=6343
2026-09-11T21:27:45.992381Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:27:46.011060Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:27:46.015473Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:27:46.017188Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:27:46.017555Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:27:46.017582Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.018479Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:27:46.028327Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:27:46.042580Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:27:46.043123Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:46.043134Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.044600Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:27:46.048595Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:27:46.052025Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:27:46.066450Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:27:46.067175Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:27:46.067186Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.068919Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:27:46.157977Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:27:46.180294Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:27:46.181555Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:27:46.181586Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.205337Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:27:46.282456Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:27:46.282498Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.446188Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:27:46.470745Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:27:46.478227Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:27:46.478258Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:46.487832Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:27:46.492003Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:27:46.496971Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:27:46.501195Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:46.501225Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:27:46.510020Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:27:46.512881Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:27:46.519362Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:27:46.519382Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:27:46.534868Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:27:46.540555Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:27:46.541591Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:27:46.544776Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:27:46.578824Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:27:46.580131Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:27:46.580145Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:27:46.583100Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:27:46.586273Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:27:46.586292Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.601456Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:27:46.602292Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:27:46.602303Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:27:46.604189Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:27:46.655089Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:27:46.664217Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:27:46.668958Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:27:46.668983Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.675800Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:27:46.715855Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:27:46.807902Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:27:46.807946Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:46.830696Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:27:46.836669Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:27:46.836699Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.844709Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:27:46.854670Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:27:46.861833Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:27:46.862597Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:46.862610Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.864840Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:27:46.876594Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:27:46.894792Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:27:46.910282Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:27:46.910742Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:46.910751Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.913039Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:27:46.930454Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:27:46.934243Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:27:46.934955Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:27:46.934967Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:46.936184Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:27:46.942316Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:27:46.946458Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:27:46.951390Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:27:46.989670Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:27:46.989709Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.011240Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:27:47.315874Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:27:47.331944Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:27:47.331971Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.355521Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:27:47.609944Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:27:47.633546Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:27:47.633575Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.653422Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:27:47.670015Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:27:47.719400Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:27:47.727272Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:27:47.727298Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.751764Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:27:47.751798Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:27:47.795442Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:27:47.796101Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:27:47.806506Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=38 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:27:47.806973Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:27:47.829092Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:47.829120Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:27:47.843852Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:27:47.844713Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:47.844730Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.846069Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:27:47.846135Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:47.847001Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:27:47.858927Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:27:47.860743Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:27:47.870148Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:27:47.877592Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:27:47.882871Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:27:47.884478Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:47.884498Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:47.884992Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:27:47.885440Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:47.885452Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.886075Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:27:47.887171Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:27:47.893676Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:27:47.897648Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:27:47.902525Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:27:47.913170Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:27:47.913623Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:27:47.913635Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.914560Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:27:47.914858Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:27:47.918863Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:27:47.920166Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:27:47.920183Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:27:47.921047Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:27:47.921082Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.921306Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:27:47.921331Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.923554Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:27:47.928323Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:47.928342Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:47.930412Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:27:47.942376Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:47.942392Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:47.943551Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:27:47.945243Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:27:47.946134Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:27:47.946144Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:27:47.948166Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:27:47.948537Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:47.948564Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:47.959036Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:27:47.968280Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:27:47.968301Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:27:47.970107Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=60 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:27:47.984150Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:27:47.990580Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:27:47.990681Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=62 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:27:47.991329Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:27:48.009556Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:27:48.011908Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:27:48.011931Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:48.012120Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:27:48.014359Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:27:48.021424Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:27:48.022027Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:48.022035Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:48.023379Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:27:48.025360Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:27:48.029680Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:27:48.029697Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:48.031011Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:27:48.031533Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:27:48.035124Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:27:48.036389Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:27:48.037250Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:27:48.044425Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:27:48.053185Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:27:48.053222Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:48.054886Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:27:48.065369Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:27:48.065387Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:48.066821Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:27:48.112303Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:27:48.112332Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:48.113400Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:27:48.126919Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:27:48.126945Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:48.132120Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=68 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:27:48.134629Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:27:48.147147Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:27:48.152480Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:27:48.152498Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:48.158671Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:27:48.222450Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:27:48.229587Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:27:48.229615Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:48.238999Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:27:48.258145Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:27:48.258831Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:27:48.258851Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:48.260347Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:27:48.271368Z  INFO local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:27:48.327446Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:27:48.327472Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:48.354746Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:27:48.606024Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:27:48.606069Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:48.639393Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:27:48.646397Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:27:48.657582Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:27:48.657603Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:48.673693Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:27:49.207662Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:27:49.240278Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:49.240310Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:27:49.286533Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:27:49.327975Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:27:49.329346Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:27:49.329364Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:27:49.332759Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:27:49.354142Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:27:49.355153Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:27:49.355165Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:27:49.357147Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:27:49.422552Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:27:49.436331Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:27:49.531726Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:27:49.558527Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:49.558552Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:49.591607Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:27:49.612111Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:27:49.612530Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:49.612544Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:49.613902Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:27:49.621380Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:27:49.624328Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:27:49.624704Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:49.624710Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:49.625887Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:27:49.666842Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:27:49.676013Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:27:49.739376Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:27:49.739407Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:49.889754Z  INFO local_candidate{attempt=6}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:27:49.908822Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:27:49.941559Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:27:49.955469Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:27:49.955491Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:49.989099Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:27:50.058683Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:27:50.058718Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.126001Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:27:50.126034Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.128798Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:27:50.132328Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:27:50.161088Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:27:50.161115Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.169344Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:27:50.279354Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:27:50.288679Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:27:50.288699Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:50.304357Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:27:50.383885Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:27:50.383916Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.399625Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:27:50.425947Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:27:50.450222Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:27:50.450243Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:27:50.478690Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:27:50.514882Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:27:50.514916Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=34 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.572785Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:27:50.572818Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.597513Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=34 tile=707 row_words=445 horizon=14301
2026-09-11T21:27:50.642092Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:27:50.642119Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.643682Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:27:50.644012Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:27:50.679905Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:50.679934Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.681487Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:27:50.726684Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=43 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:27:50.744052Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:27:50.744077Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.745756Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:27:50.757632Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:27:50.757647Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.758713Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:27:50.776157Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:27:50.776175Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:50.777305Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:27:50.976118Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:27:51.072195Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:27:51.072271Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:27:51.150725Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:27:51.176804Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:51.176831Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:51.204599Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:27:51.214141Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:27:51.236012Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:27:51.236496Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:51.236506Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:51.237886Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:27:51.248875Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:27:51.249272Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:51.249279Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:51.250550Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:27:51.253878Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:27:51.254571Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:51.254584Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:51.256488Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:27:51.278960Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:27:51.278981Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=12 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:51.281260Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6280
2026-09-11T21:27:51.295682Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:27:51.305089Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:27:51.394381Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:27:51.396237Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:27:51.452537Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:27:51.452564Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:51.481100Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:27:51.560854Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:27:51.560886Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:51.770061Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:27:51.779420Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:27:51.779439Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:51.795064Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:27:51.799105Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:27:51.799132Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=26 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:51.808841Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=26 tile=136 row_words=181 horizon=8747
2026-09-11T21:27:51.834446Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:27:51.930744Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=54 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:27:51.949756Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:27:51.950350Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:51.950363Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:51.952180Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:27:52.033980Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:27:52.034013Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.036496Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:27:52.036522Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.037321Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:27:52.053548Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:27:52.157378Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:27:52.157417Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.178794Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:27:52.178820Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.186160Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:27:52.215082Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:27:52.383087Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:27:52.383119Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.389688Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:27:52.447714Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:27:52.447751Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.452187Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:27:52.452227Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.459818Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:27:52.483019Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:27:52.590192Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:27:52.590236Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.608738Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:27:52.625113Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:27:52.651897Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:27:52.651918Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:52.654826Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:27:52.678650Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:27:52.678666Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:27:52.684949Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:27:52.690244Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:27:52.705288Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:27:52.759484Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:27:52.759510Z  INFO local_candidate{attempt=4}: 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
2026-09-11T21:27:52.840716Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:27:52.840752Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.856157Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:27:52.893017Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:27:52.893522Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:52.893532Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:52.894872Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:27:52.917472Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:27:52.917494Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=12 initial_horizon=8137 selected_horizon=8137 endpoint_lower_bound=6912 lower_bound_gap=1225 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:52.918736Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8137
2026-09-11T21:27:53.043909Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:27:53.416271Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:27:53.416317Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:53.585195Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:27:53.655299Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:27:53.655330Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:53.658046Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:27:53.678815Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:27:53.678835Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:53.681066Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:27:53.709349Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:27:53.725283Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:27:53.725311Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:53.756243Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:27:53.781214Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:53.781238Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:53.782547Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:27:53.804592Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:27:53.804621Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:53.960010Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:27:54.010576Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:27:54.011559Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:27:54.011574Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:54.014698Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:27:54.031883Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:27:54.032586Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:27:54.032599Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:54.034500Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:27:54.285215Z  INFO local_candidate{attempt=4}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:27:54.441418Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:27:54.441448Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:54.523653Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:27:54.623733Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:27:54.623775Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:54.662032Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:27:54.743452Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:27:54.806989Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:27:54.807020Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:27:54.894522Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:27:54.906843Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:27:54.927739Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:27:54.927769Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=13 initial_horizon=8593 selected_horizon=8593 endpoint_lower_bound=6912 lower_bound_gap=1681 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:54.927822Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:27:54.928281Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:54.928293Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:54.929554Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:27:54.944232Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:27:54.944247Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:54.945613Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:27:55.000382Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:27:55.000419Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.049033Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=13 tile=159 row_words=1160 horizon=8593
2026-09-11T21:27:55.073232Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:27:55.116765Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:27:55.139641Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:27:55.139670Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.159733Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:27:55.200035Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:27:55.200070Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:55.241092Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:27:55.343904Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:27:55.343938Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:55.371399Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:27:55.390535Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:27:55.396362Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:27:55.396379Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.402633Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:27:55.433663Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:27:55.473712Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:27:55.473734Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.499146Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:27:55.553844Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:27:55.601309Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:27:55.620684Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:27:55.620703Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.638615Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:27:55.638641Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.639738Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:27:55.668411Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:27:55.669123Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:27:55.669131Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.671422Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:27:55.686809Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:27:55.687448Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:27:55.687457Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.689186Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:27:55.785479Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:27:55.788947Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:27:55.788975Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=33 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:55.864292Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=33 tile=707 row_words=445 horizon=14348
2026-09-11T21:27:55.906975Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:27:55.907625Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:55.907638Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.909193Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:27:55.920438Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:27:55.920877Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:55.920886Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.922343Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:27:55.933726Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:27:55.934147Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:55.934157Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.935586Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:27:55.946001Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:27:55.946431Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:27:55.946439Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:55.947694Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:27:56.087812Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:27:56.087852Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=13 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:56.089785Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:27:56.115043Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:27:56.115065Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:56.142589Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:27:56.235757Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=13 tile=154 row_words=925 horizon=6751
2026-09-11T21:27:56.489951Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:27:56.511446Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:27:56.511468Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:56.542953Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:27:56.588470Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:27:56.608320Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:27:56.608342Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:56.627934Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:27:56.723301Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:27:56.765543Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:27:56.772353Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:27:56.772374Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:56.780471Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:27:56.787546Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:27:56.787566Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:56.852700Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:27:56.974004Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:27:56.974039Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=33 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:57.011052Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:27:57.011092Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=32 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:57.053296Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:27:57.090767Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:27:57.090787Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:57.117384Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:27:57.159085Z  INFO local_candidate{attempt=4}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:27:57.220964Z  INFO local_candidate{attempt=4}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:27:57.220986Z  INFO local_candidate{attempt=4}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:27:57.271044Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:27:57.389711Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=33 tile=109 row_words=1528 horizon=14869
2026-09-11T21:27:57.518233Z  INFO local_candidate{attempt=4}: finished large physical exchange phase phase=32 tile=109 row_words=1528 horizon=14869
2026-09-11T21:27:57.646979Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:27:57.647020Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:57.686920Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:27:57.695689Z  INFO local_candidate{attempt=6}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:27:57.888664Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:27:57.888719Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:57.902677Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:27:57.902710Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:57.936395Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:27:57.964094Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:27:58.309013Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:27:58.309045Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=13 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:58.403685Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=13 tile=79 row_words=922 horizon=6894
2026-09-11T21:27:58.795387Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:27:58.795429Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:58.837513Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:27:58.907592Z  INFO local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:27:58.915597Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:27:58.915629Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=34 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:58.988944Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=34 tile=707 row_words=445 horizon=14301
2026-09-11T21:27:59.058536Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:27:59.058566Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:59.117352Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:27:59.751186Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:27:59.751230Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=34 initial_horizon=14301 selected_horizon=14301 endpoint_lower_bound=9072 lower_bound_gap=5229 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:27:59.811775Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=34 tile=707 row_words=445 horizon=14301
2026-09-11T21:28:03.771479Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:28:03.771528Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=33 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:04.174244Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=33 tile=109 row_words=1528 horizon=14869
2026-09-11T21:28:06.397227Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:28:06.397269Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=33 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:06.811740Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=33 tile=109 row_words=1528 horizon=14869
2026-09-11T21:28:06.943547Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=44 success=true
2026-09-11T21:28:06.947071Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:28:06.952914Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=52 success=true
2026-09-11T21:28:06.953479Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:28:06.960063Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=7 success=true
2026-09-11T21:28:06.970309Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:28:06.981775Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=68 success=true
2026-09-11T21:28:06.982477Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=74 success=true
2026-09-11T21:28:06.985667Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:28:06.989698Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=7 success=true
2026-09-11T21:28:06.992307Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:28:07.000138Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:28:07.113882Z  INFO local_candidate{attempt=5}: exchange table and repeat patch storage exchange_table_bytes=40568 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:28:07.142323Z  INFO local_candidate{attempt=4}: exchange table and repeat patch storage exchange_table_bytes=40600 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:28:07.158962Z  INFO local_candidate{attempt=6}: exchange table and repeat patch storage exchange_table_bytes=40064 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:28:07.242642Z  INFO local_candidate{attempt=7}: exchange table and repeat patch storage exchange_table_bytes=39928 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:28:09.024824Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=287 success=true
2026-09-11T21:28:09.024864Z  INFO local_candidate{attempt=6}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=15112 exchange_table_bytes=40064 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:28:09.024879Z  INFO local_candidate{attempt=6}: allocated package support memory linked_end=386240 profile_bytes=1072 exchange_table_bytes=40064 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=15112 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525360, 949168)]
2026-09-11T21:28:09.024870Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=266 success=true
2026-09-11T21:28:09.024900Z  INFO local_candidate{attempt=4}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=14952 exchange_table_bytes=40600 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:28:09.024914Z  INFO local_candidate{attempt=4}: allocated package support memory linked_end=386240 profile_bytes=1060 exchange_table_bytes=40600 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=14952 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525348, 949168)]
2026-09-11T21:28:09.024946Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=355 success=true
2026-09-11T21:28:09.024968Z  INFO local_candidate{attempt=5}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=15064 exchange_table_bytes=40568 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:28:09.024980Z  INFO local_candidate{attempt=5}: allocated package support memory linked_end=386240 profile_bytes=1072 exchange_table_bytes=40568 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=15064 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525360, 949168)]
2026-09-11T21:28:09.617083Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=592 success=true
2026-09-11T21:28:09.622963Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=598 success=true
2026-09-11T21:28:09.629288Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:28:09.634186Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:28:09.634796Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:28:09.634812Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.636402Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:28:09.637687Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:28:09.641084Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:28:09.641186Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:28:09.641312Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:28:09.641835Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:28:09.642002Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:28:09.642018Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.642089Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:09.642106Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.642984Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:28:09.643610Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:28:09.644639Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:28:09.644675Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:28:09.644686Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:28:09.644806Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:28:09.644986Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:28:09.645526Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:28:09.645674Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:28:09.645692Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.645822Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=620 success=true
2026-09-11T21:28:09.647596Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:28:09.655387Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:28:09.655630Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:28:09.659657Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:28:09.659844Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:28:09.660678Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:28:09.660694Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.662446Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:28:09.664408Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:28:09.665108Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:28:09.665121Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.667574Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:28:09.671238Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:28:09.672019Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:28:09.672354Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:28:09.672371Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.674529Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:28:09.675477Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:28:09.676101Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:28:09.676132Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.676944Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:28:09.677336Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:28:09.678094Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:28:09.678109Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.678968Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:28:09.681335Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:28:09.683225Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:28:09.685303Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:28:09.686150Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:28:09.686612Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:28:09.686624Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.688373Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:28:09.700254Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:28:09.700700Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:28:09.700708Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.701919Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:28:09.713188Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:28:09.740098Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:28:09.750792Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:28:09.791992Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:28:09.792038Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:09.800219Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:28:09.830344Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:28:09.830375Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:09.836724Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:28:09.845195Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:28:09.853666Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:28:09.853686Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:09.862506Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:28:09.890785Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:28:09.890823Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:09.900265Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:28:10.031318Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:28:10.053979Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:28:10.054006Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.065292Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:28:10.088573Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:28:10.089308Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:10.089322Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.091021Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:28:10.170096Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:28:10.189876Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:28:10.202354Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:28:10.202385Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:28:10.215576Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:28:10.215607Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.228594Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:28:10.248736Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:28:10.257572Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:28:10.258352Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:10.258368Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.260641Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:28:10.262429Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:28:10.293126Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:28:10.293151Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.309852Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:28:10.344030Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:28:10.345130Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:10.345145Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.347917Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:28:10.475286Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:28:10.513572Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:28:10.513616Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.557798Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:28:10.588747Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:28:10.589424Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:10.589437Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.591372Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:28:10.668625Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:28:10.671897Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:28:10.671920Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.675478Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:28:10.686267Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:28:10.912588Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:28:10.937086Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:28:10.937114Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:10.971749Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:28:11.080539Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:28:11.109930Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:28:11.109954Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.129809Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:28:11.215722Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:28:11.223071Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:28:11.257663Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:28:11.257696Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.265871Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:28:11.265899Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.273812Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:28:11.282159Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:28:11.311547Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:28:11.330382Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:28:11.355249Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:28:11.355283Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.369539Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:28:11.369565Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.378617Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:28:11.415906Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:28:11.449247Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:28:11.449284Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:11.474757Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:28:11.498345Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:28:11.498995Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:28:11.499008Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.501423Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:28:11.514820Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:28:11.515367Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:28:11.515380Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.516793Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:28:11.524106Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:28:11.531137Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:28:11.533913Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:28:11.543685Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:28:11.545125Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:28:11.555802Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:28:11.574016Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:28:11.574356Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:28:11.574932Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:28:11.574943Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.577501Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:28:11.595647Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:28:11.596497Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:28:11.596566Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.599171Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:28:11.621743Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:28:11.622654Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:28:11.622672Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.624625Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:28:11.625462Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:28:11.625489Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.636310Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:28:11.636739Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:28:11.636748Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.638391Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:28:11.649712Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:28:11.650128Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:28:11.650137Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.651371Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:28:11.662142Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:28:11.705384Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:28:11.706213Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:28:11.712955Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:28:11.721737Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:28:11.721760Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.722119Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:28:11.722142Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.738230Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:28:11.738246Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:28:11.812919Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:28:11.830460Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:28:11.830490Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.848597Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:28:11.938342Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:28:11.945738Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:28:11.945765Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:11.955486Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:28:11.973938Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:28:11.980451Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:28:11.981013Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:28:11.981032Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:28:11.987969Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:28:11.987988Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:28:11.995520Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:28:12.003102Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:28:12.096018Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:28:12.104225Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:28:12.104250Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:28:12.116565Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:28:12.357488Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:28:12.427897Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:28:12.427935Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:12.481550Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:28:12.883878Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:28:12.910725Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:28:12.910755Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:28:12.944896Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:28:12.952852Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:28:12.953784Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:28:12.976357Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:28:12.977338Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:28:12.977353Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:28:12.979639Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:28:12.981558Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:28:12.981582Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:28:12.995763Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:28:12.996666Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:28:12.996689Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:28:12.998301Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:28:13.015729Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:28:13.033929Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:28:13.033960Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.045681Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:28:13.046027Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:28:13.046959Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:28:13.046974Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:28:13.049260Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:28:13.055336Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:28:13.064423Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:28:13.065056Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:28:13.065065Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:28:13.066657Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:28:13.110752Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:28:13.120459Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:28:13.135655Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:28:13.147952Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:28:13.178294Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:28:13.179005Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:13.179019Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.180812Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:28:13.212020Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:28:13.217221Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:28:13.217242Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:28:13.218258Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:28:13.229710Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:28:13.234617Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:28:13.235242Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:28:13.235257Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.238023Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:28:13.252251Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:28:13.252625Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:28:13.252649Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:28:13.252758Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:28:13.252769Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.254114Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:28:13.261214Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:28:13.275640Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:28:13.276411Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:28:13.276424Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.278005Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:28:13.283864Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:28:13.283895Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.291469Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:28:13.325473Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:28:13.326781Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:28:13.327966Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:28:13.327980Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:28:13.330911Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:28:13.348956Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:28:13.349876Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:28:13.349889Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:28:13.351729Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:28:13.353336Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:28:13.364722Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:28:13.365264Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:13.365274Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.366752Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:28:13.381690Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:28:13.382351Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:28:13.382363Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.383346Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:28:13.383835Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:13.383841Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.383937Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6280
2026-09-11T21:28:13.385518Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:28:13.407519Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:28:13.410472Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:28:13.421837Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:28:13.422011Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:28:13.422413Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:28:13.422426Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.424304Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:28:13.434592Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:28:13.434968Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:28:13.434976Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.436002Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:28:13.441396Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:28:13.452236Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:28:13.452740Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:28:13.452748Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:13.453996Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:28:13.656559Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:28:13.734264Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:28:13.734295Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:13.771376Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:28:13.825701Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:28:13.885102Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:28:13.885128Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:13.901398Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:28:13.913774Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:28:13.991393Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:28:13.991435Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.096684Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:28:14.111110Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:28:14.111133Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.129395Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:28:14.153843Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:28:14.205737Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:28:14.206836Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:28:14.206851Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.209680Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:28:14.222893Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:28:14.227221Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:28:14.227884Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:28:14.227895Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.229722Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:28:14.234612Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:28:14.234631Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.251598Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:28:14.383075Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:28:14.441815Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:28:14.441853Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:14.470450Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:28:14.470504Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.481428Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:28:14.506788Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:28:14.511375Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:28:14.516980Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:28:14.647111Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:28:14.678219Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:28:14.699685Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:28:14.700872Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:28:14.700888Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.703733Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:28:14.714694Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:28:14.714717Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.721350Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:28:14.722013Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:28:14.722030Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.723961Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:28:14.776326Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:28:14.800491Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:28:14.829307Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:28:14.829345Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:28:14.861157Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:28:14.934904Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:28:14.940858Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:28:14.940886Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.948062Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:28:14.957617Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:28:14.960000Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:28:14.961082Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:28:14.961824Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:28:14.968965Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:28:14.981519Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:28:14.981873Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:28:14.981880Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.983446Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:28:14.993363Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:28:14.993728Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:28:14.993735Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:14.994823Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:28:14.999700Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:28:15.004143Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:28:15.005160Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:28:15.005855Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:28:15.012378Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:28:15.013341Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:28:15.021439Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:28:15.024591Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:28:15.034772Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:28:15.035944Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:28:15.036355Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:28:15.036364Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.038668Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:28:15.050278Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:28:15.050707Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:28:15.050722Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.051946Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:28:15.067584Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:28:15.068299Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:28:15.068311Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.069763Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:28:15.078511Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:28:15.078802Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:28:15.078808Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.079787Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:28:15.079821Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.079881Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:28:15.088040Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:28:15.088370Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:28:15.088378Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.089188Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:28:15.097582Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:28:15.098902Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:28:15.098932Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:15.109598Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:28:15.109634Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:15.134247Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:28:15.134282Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.151006Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:28:15.163259Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:28:15.172955Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:28:15.180499Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:28:15.203043Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:28:15.205685Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:28:15.205714Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.238424Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:28:15.238447Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.250042Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:28:15.275785Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:28:15.278502Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:28:15.279123Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:15.279141Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.280777Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:28:15.293602Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:28:15.294022Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:15.294030Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.295464Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:28:15.300695Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:28:15.301192Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:15.301199Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.302568Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:28:15.314289Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:28:15.314713Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:15.314720Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.316043Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:28:15.349652Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:28:15.356855Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:28:15.360325Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:28:15.364679Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:28:15.374574Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:28:15.400364Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:28:15.407775Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:28:15.407823Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.417524Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:28:15.425686Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:28:15.427052Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:28:15.427071Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.430178Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:28:15.430404Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:28:15.433288Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:28:15.434646Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:28:15.435632Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:28:15.444992Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:28:15.454628Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:28:15.455593Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:28:15.455608Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.458062Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:28:15.617501Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:28:15.634485Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:28:15.634509Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.659701Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:28:15.759494Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:28:15.759535Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:15.774679Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:28:15.782980Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:28:15.816283Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:28:15.816306Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.848752Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:28:15.885301Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:28:15.917464Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:28:15.917495Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.922930Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:28:15.922960Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:15.932717Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=139 row_words=185 horizon=10717
2026-09-11T21:28:15.944627Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:28:15.945981Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:28:15.948562Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:28:15.953230Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:28:15.955321Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:28:15.955351Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:15.963093Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:28:15.963535Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:28:15.963543Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.964747Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:28:15.966585Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=139 row_words=185 horizon=10717
2026-09-11T21:28:15.973059Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:28:15.973916Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:28:15.974647Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:28:15.974661Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.976286Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:28:15.980023Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:28:15.980043Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:15.987820Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:28:16.014837Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:28:16.076769Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:28:16.076799Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.184550Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=154 row_words=925 horizon=6751
2026-09-11T21:28:16.203922Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:28:16.203957Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:16.205791Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:28:16.209871Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:28:16.213961Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:28:16.218704Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:28:16.222330Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:28:16.229780Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:28:16.230148Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:16.230155Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.231605Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:28:16.239711Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:28:16.240263Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:28:16.240275Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.241583Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:28:16.245318Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:28:16.245338Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.259629Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:28:16.273233Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:28:16.278735Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:28:16.295577Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:28:16.296022Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:16.296030Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.297509Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:28:16.320514Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2181 maximum_identical_destinations=1
2026-09-11T21:28:16.320534Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=8139 selected_horizon=8139 endpoint_lower_bound=6912 lower_bound_gap=1227 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:16.321792Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=94 row_words=38 horizon=8139
2026-09-11T21:28:16.357972Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:28:16.390119Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:28:16.390142Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:28:16.413512Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:28:16.413545Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.431520Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:28:16.699300Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:28:16.700558Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:28:16.727322Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:28:16.727348Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.759392Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:28:16.781635Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:28:16.782117Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:16.782124Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.783413Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:28:16.795092Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:28:16.795531Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:16.795540Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:16.796871Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:28:17.100167Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:28:17.143423Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:28:17.143454Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:17.178856Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:28:17.199926Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:28:17.238145Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:28:17.239019Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:17.239036Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:17.241273Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:28:17.248356Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:28:17.248385Z  INFO local_candidate{attempt=4}: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
2026-09-11T21:28:17.263606Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:28:17.264661Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:28:17.264676Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:17.267081Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:28:17.341846Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:28:17.407841Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:28:17.460382Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:28:17.460421Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:17.481572Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:28:17.495559Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:28:17.594513Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:28:17.594553Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:17.798850Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:28:17.862192Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:28:17.897441Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:28:17.897467Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:17.938841Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:28:18.010015Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:28:18.034553Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:28:18.034576Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:18.062675Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:28:18.258271Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:28:18.265439Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:28:18.265468Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:18.273327Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:28:18.502693Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:28:18.554171Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:28:18.588478Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:28:18.588511Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:18.596543Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:28:18.596575Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:18.629402Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:28:18.658226Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:28:18.658893Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:18.658902Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:18.660667Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:28:18.664340Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:28:18.676169Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:28:18.676746Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:18.676756Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:18.678463Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:28:18.927825Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:28:18.927864Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:18.961598Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:28:19.370159Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:28:19.475772Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:28:19.475806Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:19.657784Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:28:19.667308Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:28:19.747903Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:28:19.747938Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:28:19.881574Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:28:20.159086Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:28:20.178672Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:28:20.178700Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:20.185540Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:28:20.197261Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:28:20.238746Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:28:20.251182Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:28:20.251229Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:20.296533Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:28:20.296559Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:20.329021Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=712 row_words=447 horizon=14529
2026-09-11T21:28:20.343166Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:28:20.355399Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:28:20.355428Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:20.402416Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:28:21.014482Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:28:21.014524Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:21.046903Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:28:21.216452Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:28:21.216492Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:21.246513Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:28:21.251517Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:28:21.251562Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:21.266056Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:28:21.290625Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:28:21.427631Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:28:21.427669Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:21.515036Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:28:21.515105Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:28:21.613453Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:28:21.613483Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:21.841446Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=1051 horizon=6343
2026-09-11T21:28:21.853885Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:28:21.853926Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:21.975605Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=712 row_words=446 horizon=14529
2026-09-11T21:28:22.241493Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:28:22.241547Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=8617 selected_horizon=8617 endpoint_lower_bound=6912 lower_bound_gap=1705 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:22.435003Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=149 row_words=1113 horizon=8617
2026-09-11T21:28:23.137513Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:28:23.137563Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:23.242971Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:28:23.244065Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=712 row_words=446 horizon=14529
2026-09-11T21:28:23.335973Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:28:23.336007Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:23.407461Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:28:26.847794Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:28:26.847832Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:27.079746Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:28:27.079782Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:27.199081Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=162 row_words=1526 horizon=14751
2026-09-11T21:28:27.452666Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=162 row_words=1526 horizon=14751
2026-09-11T21:28:28.143051Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:28:28.143092Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:28.484107Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=162 row_words=1526 horizon=14751
2026-09-11T21:28:28.548872Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18903 success=true
2026-09-11T21:28:28.551354Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18928 success=true
2026-09-11T21:28:28.846709Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:28:28.895300Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:28:28.895323Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:28.949279Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:28:28.967666Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=19482 success=true
2026-09-11T21:28:28.967766Z  INFO local_candidate{attempt=7}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=15112 exchange_table_bytes=39928 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:28:28.968632Z  INFO local_candidate{attempt=7}: allocated package support memory linked_end=386240 profile_bytes=1072 exchange_table_bytes=39928 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=15112 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525360, 949168)]
2026-09-11T21:28:28.969422Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=19352 success=true
2026-09-11T21:28:29.471288Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=502 success=true
2026-09-11T21:28:29.487618Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:28:29.488115Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:29.488127Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.489570Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:28:29.491583Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:28:29.492426Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:28:29.492440Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.494274Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:28:29.507267Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:28:29.508710Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:28:29.508726Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:28:29.512183Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:28:29.527742Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:28:29.528794Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:28:29.534439Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:28:29.535444Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:28:29.535460Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:28:29.537664Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:28:29.538122Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:28:29.541878Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:28:29.547600Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:28:29.548104Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:28:29.548116Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.549999Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=866 row_words=10 horizon=471
2026-09-11T21:28:29.550344Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:28:29.550704Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:28:29.550714Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.551678Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=39 row_words=39 horizon=4006
2026-09-11T21:28:29.561645Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:28:29.562099Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:28:29.562108Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.563163Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=47 row_words=23 horizon=374
2026-09-11T21:28:29.564595Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:28:29.565091Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:28:29.565100Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.566260Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=1104 row_words=41 horizon=172
2026-09-11T21:28:29.569428Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:28:29.573026Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:28:29.573309Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:28:29.573316Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.574241Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=46 row_words=9 horizon=216
2026-09-11T21:28:29.575057Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:28:29.577382Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:28:29.581401Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:28:29.581685Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:28:29.581691Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.582437Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=0 row_words=1028 horizon=2206
2026-09-11T21:28:29.585924Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:28:29.587250Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:28:29.589246Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:28:29.595921Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:28:29.611349Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:28:29.611881Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:28:29.611891Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.613880Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=875 row_words=10 horizon=1112
2026-09-11T21:28:29.625889Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:28:29.626358Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:28:29.626369Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.627447Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=47 row_words=23 horizon=374
2026-09-11T21:28:29.633920Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:28:29.647027Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:28:29.647650Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:28:29.647660Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.648992Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=14 row_words=49 horizon=5913
2026-09-11T21:28:29.692911Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:28:29.701257Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:28:29.701277Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:28:29.713137Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:28:29.735557Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:28:29.758837Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:28:29.758857Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:28:29.784757Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:28:29.797575Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:28:29.801084Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=74
2026-09-11T21:28:29.805456Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=75
2026-09-11T21:28:29.810780Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:28:29.812930Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:28:29.814059Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:28:29.814850Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:28:29.820757Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:28:29.892717Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:28:29.916177Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:28:29.916219Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.926217Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:28:29.926902Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=104 row_words=187 horizon=8266
2026-09-11T21:28:29.947150Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:28:29.947167Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.947349Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:28:29.947931Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:29.947940Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:29.949636Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=146 row_words=20 horizon=8454
2026-09-11T21:28:29.968245Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:28:30.067815Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:28:30.067844Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=11896 selected_horizon=11896 endpoint_lower_bound=7872 lower_bound_gap=4024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:30.074578Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=1428 row_words=47 horizon=11896
2026-09-11T21:28:30.101679Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:28:30.106346Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:28:30.106361Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:30.111790Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:28:30.125496Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:28:30.125886Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:30.125897Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:30.127199Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=74 row_words=15 horizon=3625
2026-09-11T21:28:30.148074Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:28:30.160331Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:28:30.160683Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:28:30.160690Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:30.162259Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=866 row_words=10 horizon=471
2026-09-11T21:28:30.172837Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:28:30.173218Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:30.173225Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2969 selected_horizon=2969 endpoint_lower_bound=2304 lower_bound_gap=665 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:30.174510Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=13 row_words=20 horizon=2969
2026-09-11T21:28:30.217420Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:28:30.226312Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:28:30.359043Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:28:30.378778Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:28:30.378797Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:30.406234Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=1090 row_words=186 horizon=7433
2026-09-11T21:28:30.545880Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:28:30.573504Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:28:30.573531Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:28:30.608443Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:28:30.734253Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:28:30.734293Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=10717 selected_horizon=10717 endpoint_lower_bound=7872 lower_bound_gap=2845 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:30.743570Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=139 row_words=185 horizon=10717
2026-09-11T21:28:30.758899Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:28:30.764560Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:28:30.764579Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:30.771046Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=32 row_words=134 horizon=7129
2026-09-11T21:28:30.783493Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:28:30.783820Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=72 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:28:30.783826Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=72 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:30.784714Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=72 tile=47 row_words=25 horizon=406
2026-09-11T21:28:30.962757Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:28:30.962785Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:30.979447Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=127 row_words=165 horizon=16042
2026-09-11T21:28:31.005540Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:28:31.006435Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:28:31.006452Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:31.009273Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=1452 row_words=15 horizon=3578
2026-09-11T21:28:31.026099Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:28:31.026705Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:28:31.026715Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=4463 selected_horizon=4463 endpoint_lower_bound=2152 lower_bound_gap=2311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:31.028635Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=684 row_words=18 horizon=4463
2026-09-11T21:28:31.052826Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:28:31.093847Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:28:31.093875Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:31.108521Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:28:31.237242Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:28:31.268854Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:28:31.268882Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:31.333031Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:28:31.333074Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:31.348849Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=34 row_words=731 horizon=5250
2026-09-11T21:28:31.361017Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:28:31.521632Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:28:31.541545Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:28:31.541568Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:31.557221Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:28:31.882266Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:28:31.929870Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:28:31.929893Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:31.990033Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=235 row_words=253 horizon=1463
2026-09-11T21:28:32.017923Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:28:32.018405Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:32.018416Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.019623Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:28:32.027922Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:28:32.093930Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:28:32.093954Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.120601Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:28:32.121421Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:32.121435Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.122147Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:28:32.122577Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:28:32.122598Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=2834 selected_horizon=2834 endpoint_lower_bound=2304 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.122935Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=13 row_words=21 horizon=2978
2026-09-11T21:28:32.124030Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=114 row_words=24 horizon=2834
2026-09-11T21:28:32.155357Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:28:32.182657Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:28:32.182675Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.198216Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=922 horizon=6894
2026-09-11T21:28:32.219111Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:28:32.278043Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:28:32.304874Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:28:32.304896Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.341862Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1095 row_words=135 horizon=822
2026-09-11T21:28:32.387312Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-11T21:28:32.425192Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:28:32.425222Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.453945Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=480 row_words=519 horizon=10141
2026-09-11T21:28:32.499722Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:28:32.499767Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:32.500396Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:28:32.513606Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:28:32.513626Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.528374Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:28:32.555648Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:28:32.655953Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:28:32.744505Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:28:32.744533Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:32.825235Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:28:33.525359Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:28:33.557187Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:28:33.621377Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:28:33.621405Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:33.651924Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=71 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:28:33.651947Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=71 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:28:33.767748Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=553 row_words=658 horizon=2731
2026-09-11T21:28:33.826163Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=71 tile=324 row_words=455 horizon=1906
2026-09-11T21:28:33.884734Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:28:33.963514Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:28:33.963551Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:33.999407Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:28:34.828281Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:28:34.828322Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:34.901014Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=712 row_words=446 horizon=14529
2026-09-11T21:28:36.742996Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:28:36.832576Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:28:36.832609Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:28:36.953381Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:28:38.517768Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9548 success=true
2026-09-11T21:28:38.542738Z  INFO local_candidate{attempt=5}: costed final placed program final_cycles=13922376 final_exchange=6407003
2026-09-11T21:28:39.594631Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:28:39.621741Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=255 success=true
2026-09-11T21:28:39.710074Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=88 success=true
2026-09-11T21:28:39.777124Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:28:39.777164Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:39.848188Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:28:40.136732Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=382 success=true
2026-09-11T21:28:40.514831Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11963 success=true
2026-09-11T21:28:40.557972Z  INFO local_candidate{attempt=4}: costed final placed program final_cycles=13870590 final_exchange=6342095
2026-09-11T21:28:40.879995Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12331 success=true
2026-09-11T21:28:40.912086Z  INFO local_candidate{attempt=6}: costed final placed program final_cycles=13938036 final_exchange=6402467
2026-09-11T21:28:41.614697Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=165 success=true
2026-09-11T21:28:41.709304Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=94 success=true
2026-09-11T21:28:41.971230Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:28:41.971266Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:28:42.163636Z  INFO local_candidate{attempt=4}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=409 success=true
2026-09-11T21:28:42.355488Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=162 row_words=1526 horizon=14751
2026-09-11T21:28:42.375435Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=158 success=true
2026-09-11T21:28:42.435430Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=12964 success=true
2026-09-11T21:28:42.488183Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=112 success=true
2026-09-11T21:28:43.194510Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=598 success=true
2026-09-11T21:28:52.648805Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10213 success=true
2026-09-11T21:28:52.675777Z  INFO local_candidate{attempt=7}: costed final placed program final_cycles=13957449 final_exchange=6421880
2026-09-11T21:28:53.760098Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=170 success=true
2026-09-11T21:28:53.856983Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=96 success=true
2026-09-11T21:28:54.293267Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=387 success=true
2026-09-11T21:28:55.711125Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=4 before=14058753 after=13870590 changed_operations=[] opened_boundaries=[357]
2026-09-11T21:28:59.661381Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=3 threads=16
2026-09-11T21:29:05.324729Z  INFO local_candidate{attempt=6}: screened exchange table geometry expansion_ms=4702 expansion_and_footprint_ms=5663 estimated_row_bytes=70080 heuristic_row_bytes=142088 geometry_fragments_per_tile=7807 fragment_limit=16384
2026-09-11T21:29:05.441526Z  INFO local_candidate{attempt=6}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:29:05.972534Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:29:05.976541Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:29:05.981114Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:29:05.981894Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:05.981909Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:05.984340Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:29:05.984768Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:29:05.985437Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:29:05.985449Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:05.986757Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:29:05.994254Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:29:05.995544Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:05.995561Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:05.998298Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:29:05.998839Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:05.998850Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:05.999075Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:29:06.000365Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:29:06.008799Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:29:06.013640Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:29:06.016162Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:29:06.016192Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:29:06.016380Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:29:06.019083Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:29:06.022855Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:29:06.029888Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:29:06.031498Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:29:06.037639Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:29:06.038488Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:29:06.038505Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.040573Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:29:06.042585Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:29:06.062899Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:29:06.063518Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:29:06.063532Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.064856Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:29:06.065288Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:29:06.065912Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:29:06.066381Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:29:06.066396Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.066728Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:29:06.066744Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:29:06.068433Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:29:06.070735Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:29:06.080461Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:29:06.081008Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:29:06.081022Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.082713Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:29:06.096018Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:29:06.096491Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:29:06.096501Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.097938Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:29:06.106738Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:29:06.106764Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:06.109029Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:29:06.114653Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:29:06.129268Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:29:06.133936Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:29:06.133958Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.139602Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:29:06.157161Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:29:06.179955Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:29:06.190080Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:29:06.195816Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:29:06.195837Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.196894Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:29:06.200636Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:29:06.201494Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:29:06.210527Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:29:06.210542Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:29:06.224785Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:29:06.237718Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:29:06.242234Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:29:06.247570Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:29:06.276701Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:29:06.290670Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:29:06.291070Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:06.291078Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.292882Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:29:06.303070Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:29:06.303482Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:06.303496Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.304706Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:29:06.319182Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:29:06.319820Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:06.319829Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.321583Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:29:06.442883Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:29:06.469065Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:29:06.477860Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:29:06.477898Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:29:06.494835Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:29:06.494858Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.508045Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:29:06.520172Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:29:06.521677Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:29:06.531237Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:29:06.531859Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:06.531868Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.533518Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:29:06.539692Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:29:06.539714Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.551637Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:29:06.551652Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=12 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:06.553393Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6280
2026-09-11T21:29:06.564079Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:29:06.593962Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:29:06.624300Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:29:06.624327Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.639682Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:29:06.957539Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:29:06.981717Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:29:06.981748Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:06.990291Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:29:06.990329Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:07.013790Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:29:07.015987Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:29:07.036570Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:29:07.037107Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:07.037123Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.038727Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:29:07.042465Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:29:07.043249Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:29:07.043265Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.045276Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:29:07.054903Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:29:07.058938Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:29:07.060693Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:29:07.061994Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:29:07.072369Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:29:07.148319Z  INFO local_candidate{attempt=7}: screened exchange table geometry expansion_ms=6159 expansion_and_footprint_ms=7486 estimated_row_bytes=70080 heuristic_row_bytes=142088 geometry_fragments_per_tile=7807 fragment_limit=16384
2026-09-11T21:29:07.263847Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:29:07.291423Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:29:07.295556Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:29:07.295577Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.299538Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:29:07.299559Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.304616Z  INFO local_candidate{attempt=7}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:29:07.309191Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:29:07.356606Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:29:07.395372Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:29:07.413791Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:29:07.415026Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:29:07.415042Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.418736Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:29:07.435305Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:29:07.435328Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.442287Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:29:07.443171Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:29:07.443182Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.445720Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:29:07.449563Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:29:07.518466Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:29:07.539521Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:29:07.539545Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.560338Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:29:07.567486Z  INFO local_candidate{attempt=5}: screened exchange table geometry expansion_ms=6559 expansion_and_footprint_ms=7906 estimated_row_bytes=71616 heuristic_row_bytes=142088 geometry_fragments_per_tile=7999 fragment_limit=16384
2026-09-11T21:29:07.610110Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:29:07.610617Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:07.610627Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.612024Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:29:07.662607Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:29:07.729879Z  INFO local_candidate{attempt=5}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:29:07.838941Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:29:07.852736Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:29:07.852761Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.865671Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:29:07.867050Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:29:07.908627Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:07.908655Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:07.938956Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:29:07.938985Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:07.961425Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:29:07.970499Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:29:08.323969Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:29:08.336360Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:29:08.375674Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:29:08.376228Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:29:08.376254Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.378901Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:29:08.379478Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:08.379495Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.381593Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:29:08.391939Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:29:08.393021Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:29:08.393035Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.394264Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:29:08.394741Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:08.394751Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.394997Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:29:08.395933Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:29:08.402393Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:29:08.408155Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:29:08.410467Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:29:08.419375Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:29:08.420603Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:29:08.429708Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:29:08.446529Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:29:08.447082Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:29:08.447093Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.449148Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:29:08.462550Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:29:08.462778Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:29:08.463083Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:29:08.463092Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.464398Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:29:08.482961Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:29:08.483775Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:29:08.483788Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.485531Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:29:08.498439Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:29:08.498819Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:29:08.498826Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.500109Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:29:08.510030Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:29:08.510421Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:29:08.510429Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.511397Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:29:08.517360Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:29:08.521448Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:29:08.535449Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:29:08.535988Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:08.536002Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.537992Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:29:08.551275Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:29:08.551762Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:08.551774Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.552970Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:29:08.631061Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:29:08.665437Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:29:08.665469Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.707569Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:29:08.722156Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:29:08.727774Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:29:08.728060Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:29:08.728078Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.735621Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:29:08.750528Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:29:08.750545Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.762554Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:29:08.786483Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:29:08.787321Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:08.787338Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:08.789244Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:29:08.852931Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:29:08.852977Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:08.898087Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:29:09.052772Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:29:09.052805Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:09.060426Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:29:09.379084Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:29:09.402570Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:29:09.402593Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:09.431862Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:29:09.448473Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:29:09.451163Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:29:09.452250Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:29:09.453020Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:29:09.459182Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:29:09.597659Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:29:09.602919Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:29:09.602938Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:09.611058Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:29:09.627366Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:29:09.627800Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:09.627806Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:09.629185Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:29:09.658603Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:29:09.658634Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=13 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:09.741365Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:29:09.771020Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=13 tile=154 row_words=925 horizon=6751
2026-09-11T21:29:09.811435Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:29:09.816214Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:29:09.821845Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:29:09.833653Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:29:09.834161Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:29:09.834169Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:09.835590Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:29:09.835623Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:29:09.835646Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:29:09.891448Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:29:09.913611Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:29:09.913632Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:29:09.933293Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:29:09.940407Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:29:09.974871Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:29:10.026174Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:29:10.026961Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:10.026972Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.028834Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:29:10.041551Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:29:10.041588Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.106716Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:29:10.109903Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:29:10.109922Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.113188Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:29:10.123654Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:29:10.165053Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:29:10.199224Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:29:10.199253Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.210981Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:29:10.296460Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:29:10.336249Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:29:10.371226Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:29:10.394837Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:29:10.394872Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.415055Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:29:10.473145Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:29:10.473176Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:10.474987Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:29:10.475008Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.491818Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:29:10.491878Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:29:10.520792Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:29:10.520816Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.521125Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:29:10.522166Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:29:10.522180Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:29:10.525012Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:29:10.534117Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:29:10.541565Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:29:10.542269Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:29:10.542279Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:29:10.544066Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:29:10.595124Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:29:10.605124Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:29:10.635753Z  INFO local_candidate{attempt=6}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:29:10.637034Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:29:10.663038Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:29:10.693180Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:29:10.695045Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:29:10.695072Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.704070Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:29:10.704088Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.720848Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:29:10.721273Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:29:10.721305Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:10.724336Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:29:10.734754Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:29:10.765739Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:29:10.790426Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:29:10.790459Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:10.828534Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:29:10.837570Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:29:10.837590Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:29:10.853946Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:29:10.886455Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:29:10.979598Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:29:10.999318Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:29:10.999343Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:11.016881Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:29:11.052532Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:29:11.053632Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:29:11.053648Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:11.056622Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:29:11.077824Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:29:11.078636Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:29:11.078652Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:11.080770Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:29:11.318520Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:29:11.318559Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=33 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:11.399428Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=33 tile=707 row_words=445 horizon=14348
2026-09-11T21:29:11.497392Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:29:11.545285Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:11.545307Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:29:11.581795Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:29:11.617912Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:29:11.619345Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:11.619376Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:11.622616Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:29:11.697259Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:29:11.719401Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:29:11.720106Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:11.720117Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:11.722113Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:29:11.745261Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:29:11.745283Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:11.747556Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:29:11.784673Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:29:11.816380Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:29:11.816404Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:11.861519Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:29:12.074147Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:29:12.111427Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:12.111459Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:29:12.134465Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:29:12.159301Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:29:12.204718Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:29:12.204753Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:29:12.304379Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:29:12.513768Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:29:12.539715Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:29:12.539738Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:12.566250Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:29:12.682931Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:29:12.780616Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:29:12.780645Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:12.851122Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:29:12.897465Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:29:12.897491Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:12.926373Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:29:12.938028Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:29:12.944838Z  INFO local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:29:13.030571Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:29:13.030605Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:13.063778Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:29:13.288196Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:29:13.288260Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:13.332092Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:29:13.462592Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:29:13.462624Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=13 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:13.568604Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=13 tile=79 row_words=922 horizon=6894
2026-09-11T21:29:14.376932Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:29:14.468634Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:29:14.468668Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:14.542643Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:29:14.542674Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:14.550279Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:29:14.578420Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:29:14.623728Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:29:14.761834Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:29:14.761868Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:14.873112Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:29:14.873148Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=33 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:14.952851Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=33 tile=707 row_words=445 horizon=14348
2026-09-11T21:29:15.028436Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:29:15.700835Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:29:15.732058Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:15.732088Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:15.780894Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:29:16.004995Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:29:16.008867Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:29:16.009469Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:16.009483Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.011136Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:29:16.011469Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:29:16.020469Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:29:16.021650Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:29:16.021665Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:29:16.023981Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:29:16.024217Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:29:16.024481Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:16.024495Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.025705Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:29:16.025838Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:29:16.026522Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:29:16.026538Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.027996Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:29:16.032349Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:29:16.038256Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:29:16.040520Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:29:16.040523Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:29:16.041258Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:29:16.041270Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:29:16.042954Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:29:16.049588Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:29:16.050842Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:29:16.060125Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:29:16.076724Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:29:16.077279Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:29:16.077294Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.079364Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:29:16.084560Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:29:16.085056Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:29:16.085065Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.086215Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:29:16.091347Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:29:16.092020Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:16.092032Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.093870Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:29:16.094474Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:29:16.101308Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:29:16.101927Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:29:16.101937Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.103268Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:29:16.104598Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:29:16.110921Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:29:16.111242Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:29:16.111248Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.112284Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:29:16.117067Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:29:16.117089Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:16.119227Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:29:16.120187Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:29:16.120491Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:29:16.120498Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.121344Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:29:16.125853Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:29:16.128787Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:29:16.131681Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:29:16.131698Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.134849Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:29:16.137076Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:29:16.138564Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:29:16.142922Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:29:16.148264Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:29:16.151482Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:29:16.152996Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:29:16.154059Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:29:16.162680Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:29:16.183413Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:29:16.184162Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:29:16.184171Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.186351Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:29:16.201977Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:29:16.202601Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:29:16.202609Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.204314Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:29:16.260639Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:29:16.260679Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:16.270341Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:29:16.277937Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:29:16.298225Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:29:16.303695Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:29:16.303712Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:29:16.307109Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:29:16.307132Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:29:16.323882Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:29:16.333644Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:29:16.345961Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:29:16.346636Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:16.346649Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.348504Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:29:16.398242Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:29:16.422291Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:29:16.422311Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.431343Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:29:16.433566Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:29:16.434428Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:29:16.434446Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.437710Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:29:16.447929Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:29:16.456438Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:29:16.457270Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:16.457285Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.459232Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:29:16.820567Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:29:16.849518Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:29:16.849560Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:16.862442Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:29:16.995448Z  INFO local_candidate{attempt=6}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:29:17.072878Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:29:17.097110Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:29:17.097133Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:17.128342Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:29:17.187470Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:29:17.187507Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:17.204835Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:29:17.204874Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:17.212019Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:29:17.234545Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:29:17.235276Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:29:17.235292Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:17.236770Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:29:17.311699Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:29:17.605678Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:29:17.627164Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:29:17.639805Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:29:17.639829Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:17.642648Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:29:17.642669Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:17.661481Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:29:17.665434Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:29:17.671062Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:29:17.702180Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:29:17.702228Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:17.734666Z  INFO local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:29:17.788571Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:29:17.816176Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:29:17.816791Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:17.816802Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:17.818357Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:29:17.879147Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:29:17.884496Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:29:17.891248Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:29:17.891269Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:17.900558Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:29:17.937679Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:29:17.937713Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:18.019520Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:29:18.074302Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:29:18.090936Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:29:18.091465Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:18.091479Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:18.093558Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:29:18.105343Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:29:18.105838Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:18.105853Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:18.107080Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:29:18.119898Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:29:18.120409Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:18.120421Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:18.122120Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:29:18.461340Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:29:18.488162Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:29:18.488184Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:18.519144Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:29:18.584374Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:29:18.589856Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:29:18.622907Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:29:18.622937Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:18.635458Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:29:18.635504Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:18.649994Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:29:18.650781Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:29:18.650827Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:18.687597Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:29:18.694887Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:29:18.732323Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:18.732350Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:18.766518Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:29:18.772919Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:29:18.789133Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:29:18.850543Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:29:18.850574Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:29:18.959195Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:29:19.177134Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:29:19.177165Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=32 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:19.399151Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:29:19.399185Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:19.441118Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:29:19.545042Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:29:19.610374Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:29:19.610400Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:19.613881Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=32 tile=109 row_words=1528 horizon=14869
2026-09-11T21:29:19.640497Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:29:21.583465Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:29:21.702698Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:29:21.702730Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:21.928249Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:29:22.002055Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:29:22.068335Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:29:22.068369Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:22.117506Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:29:22.297441Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:29:22.436705Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:29:22.436741Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:22.705732Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:29:22.869979Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:29:22.870017Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=33 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:22.976827Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=33 tile=707 row_words=445 horizon=14348
2026-09-11T21:29:23.236040Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:29:23.307007Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:23.307035Z  INFO local_candidate{attempt=5}: 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
2026-09-11T21:29:23.359811Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:29:23.684971Z  INFO local_candidate{attempt=5}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:29:23.835240Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:29:23.835270Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:23.905738Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:29:26.255308Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:29:26.255344Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=32 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:26.651416Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=32 tile=109 row_words=1528 horizon=14869
2026-09-11T21:29:31.093467Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:29:31.093511Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=32 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:31.537104Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=32 tile=109 row_words=1528 horizon=14869
2026-09-11T21:29:31.679982Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=34 success=true
2026-09-11T21:29:31.684980Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-11T21:29:31.692252Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:29:31.904775Z  INFO local_candidate{attempt=7}: exchange table and repeat patch storage exchange_table_bytes=39760 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:29:33.586085Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:29:33.637315Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:29:33.637342Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:33.660541Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:29:34.138714Z  INFO local_candidate{attempt=5}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:29:34.193959Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:29:34.193989Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.212970Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:29:34.247615Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=128 success=true
2026-09-11T21:29:34.247661Z  INFO local_candidate{attempt=7}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=14920 exchange_table_bytes=39760 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:29:34.247680Z  INFO local_candidate{attempt=7}: allocated package support memory linked_end=386240 profile_bytes=1060 exchange_table_bytes=39760 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=14920 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525348, 949168)]
2026-09-11T21:29:34.409584Z  INFO local_candidate{attempt=5}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:29:34.409621Z  INFO local_candidate{attempt=5}: optimized physical exchange schedule phase=13 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:34.538692Z  INFO local_candidate{attempt=5}: finished large physical exchange phase phase=13 tile=79 row_words=1051 horizon=6343
2026-09-11T21:29:34.653049Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=82 success=true
2026-09-11T21:29:34.656829Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:29:34.663000Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:29:34.808800Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:29:34.817177Z  INFO local_candidate{attempt=5}: exchange table and repeat patch storage exchange_table_bytes=40400 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:29:34.847537Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=599 success=true
2026-09-11T21:29:34.858358Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:29:34.858402Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:29:34.865473Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:29:34.866105Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:29:34.866311Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:29:34.866327Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.866757Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:34.866770Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.868034Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:29:34.868241Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:29:34.869066Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:29:34.869110Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:34.869121Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.869760Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:29:34.870368Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:29:34.870379Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.871090Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:29:34.871621Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:29:34.881825Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:29:34.882329Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:34.882342Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.883556Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:29:34.890196Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:29:34.890298Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:29:34.891137Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:29:34.891150Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.891487Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:29:34.893193Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:29:34.893780Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:29:34.893807Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.896571Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:29:34.898071Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:29:34.898689Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:29:34.898833Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:29:34.898898Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:34.898912Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.900944Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:29:34.901405Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:29:34.903596Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:29:34.903620Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.904471Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:29:34.904908Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:29:34.904915Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.906478Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:29:34.908408Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:29:34.909712Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:29:34.916156Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:29:34.916571Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:34.916581Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.918233Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:29:34.918645Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:29:34.918653Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.918734Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:29:34.919091Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:29:34.919881Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:29:34.929241Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:29:34.929639Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:34.929648Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.930873Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:29:34.931117Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:29:34.931154Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:29:34.932681Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:29:34.932696Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.936618Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:29:34.936678Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:29:34.937154Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:29:34.937163Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.937181Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:29:34.939566Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:29:34.939788Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:29:34.940671Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:29:34.941429Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:29:34.946051Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:29:34.948369Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:29:34.967918Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:29:34.968621Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:34.968634Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.970833Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:29:34.980591Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:29:34.987726Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:29:34.988357Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:34.988370Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:34.990611Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:29:35.012063Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:29:35.013068Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:29:35.013085Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.015657Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:29:35.047663Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:29:35.047710Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:35.048333Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:29:35.053727Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:29:35.053743Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.057446Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:29:35.059584Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:29:35.078665Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:29:35.079512Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:35.079525Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.081632Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:29:35.093624Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:29:35.099321Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:29:35.099337Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.106151Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:29:35.109434Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:29:35.112755Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:29:35.116849Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:29:35.163899Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:29:35.167009Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:29:35.167029Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.170424Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:29:35.175326Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:29:35.176181Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:29:35.176193Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:29:35.178412Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:29:35.193360Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:29:35.193959Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:29:35.193967Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:29:35.195403Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:29:35.238900Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:29:35.248132Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:29:35.317239Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:29:35.344791Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:29:35.344819Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:29:35.356022Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:29:35.356054Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:35.372003Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:29:35.382374Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:29:35.393129Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:29:35.406659Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:29:35.407263Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:29:35.407278Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.408649Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:29:35.423159Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:29:35.423184Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.437231Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:29:35.464891Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:29:35.475701Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:29:35.475722Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:29:35.487569Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:29:35.491531Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:29:35.491927Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:29:35.498647Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:29:35.498669Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.519976Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:29:35.520017Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:35.520800Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:29:35.532866Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:29:36.132406Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:29:36.140102Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:29:36.161510Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:29:36.161541Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:36.166282Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:29:36.166307Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:36.186225Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:29:36.196391Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:29:36.227274Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:29:36.238421Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:36.238445Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:36.274442Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:29:36.290663Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:29:36.711186Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=312 success=true
2026-09-11T21:29:36.711241Z  INFO local_candidate{attempt=5}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=14872 exchange_table_bytes=40400 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:29:36.711262Z  INFO local_candidate{attempt=5}: allocated package support memory linked_end=386240 profile_bytes=1060 exchange_table_bytes=40400 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=14872 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525348, 949168)]
2026-09-11T21:29:36.978777Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:29:37.035301Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:29:37.036699Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:29:37.036725Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.056525Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:29:37.089703Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:29:37.089737Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.111746Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:29:37.131843Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:29:37.180042Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:29:37.180070Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.201527Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:29:37.255483Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:29:37.255507Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:29:37.273787Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:29:37.310348Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=599 success=true
2026-09-11T21:29:37.325422Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:29:37.346433Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:29:37.349594Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:29:37.350835Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:29:37.350851Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:29:37.354299Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:29:37.375615Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:29:37.376499Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:29:37.376511Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:29:37.378736Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:29:37.444194Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:29:37.444211Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:29:37.449781Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:29:37.449797Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.454844Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:29:37.457533Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:29:37.486266Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:29:37.486298Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:37.496942Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:29:37.623399Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:29:37.643804Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:29:37.643832Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.661576Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:29:37.691395Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:29:37.720561Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:29:37.720584Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:29:37.756740Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:29:37.832968Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:29:37.860398Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:29:37.860423Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.872584Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:29:37.896062Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:29:37.896841Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:37.896853Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.898639Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:29:37.907376Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:29:37.907412Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:37.944924Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:29:37.975259Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:29:37.975849Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:37.975861Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.977609Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:29:37.995805Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:29:37.996681Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:29:37.996695Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6856 selected_horizon=6856 endpoint_lower_bound=5184 lower_bound_gap=1672 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:37.998586Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6856
2026-09-11T21:29:38.483148Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:29:38.483194Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:38.535543Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:29:38.644365Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:29:38.669666Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:29:38.669693Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:38.705777Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:29:38.910775Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:29:38.927619Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:29:38.952541Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:29:38.952564Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:38.956351Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:29:38.956376Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:38.973433Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:29:38.986894Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:29:38.993817Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:29:39.018613Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:29:39.019147Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:39.019156Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:39.020649Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:29:39.073117Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:29:39.073152Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6894 selected_horizon=6894 endpoint_lower_bound=5184 lower_bound_gap=1710 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:39.079808Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:29:39.232762Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=922 horizon=6894
2026-09-11T21:29:39.365044Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:29:39.391417Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:29:39.408568Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:29:39.408590Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:39.424843Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:29:39.425592Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:29:39.425612Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:39.453844Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:29:39.490519Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:29:39.491574Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:29:39.491588Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:39.494006Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:29:39.519824Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:29:39.520706Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:29:39.520725Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:39.522760Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:29:39.648130Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:29:39.655722Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:29:39.655739Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:29:39.666823Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:29:40.217624Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:29:40.272371Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:40.272405Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:29:40.319040Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:29:40.563316Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:29:40.590032Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:29:40.591871Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:40.591891Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:29:40.617659Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:29:40.627809Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:29:40.654660Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128156 maximum_identical_destinations=1
2026-09-11T21:29:40.654687Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6343 selected_horizon=6343 endpoint_lower_bound=5184 lower_bound_gap=1159 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:40.678623Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:29:40.678647Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:40.710169Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:29:40.792816Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:29:40.826190Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=1051 horizon=6343
2026-09-11T21:29:40.890096Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:29:40.890122Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:40.906923Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:29:40.950744Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:29:40.964352Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:29:40.964385Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:40.987529Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:29:40.987549Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:40.991324Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:29:41.001215Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:29:41.001233Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.010775Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:29:41.016152Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:29:41.016839Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:29:41.033184Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:29:41.033645Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:41.033655Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.035267Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:29:41.043587Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:29:41.044935Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:29:41.045318Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:41.045327Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.046405Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:29:41.051477Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:29:41.053698Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:29:41.056131Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:29:41.057907Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:29:41.064469Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:29:41.065470Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:29:41.072917Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:29:41.078242Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:29:41.086463Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:29:41.086857Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:29:41.086864Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.088576Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:29:41.089417Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:29:41.089432Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.089500Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:29:41.091113Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:29:41.091128Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:29:41.092086Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:41.092104Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.095060Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:29:41.104281Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:29:41.104730Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:29:41.104739Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.105939Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:29:41.115141Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:29:41.115167Z  INFO local_candidate{attempt=5}: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
2026-09-11T21:29:41.121401Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:29:41.121997Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:29:41.122006Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.123792Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:29:41.131796Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:29:41.132098Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:29:41.132104Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.133254Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:29:41.139741Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:29:41.141242Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:29:41.141549Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:29:41.141555Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.142419Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:29:41.149975Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:29:41.154798Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:29:41.160052Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:29:41.160596Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:29:41.160609Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.162828Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:29:41.175873Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:29:41.176372Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:29:41.176391Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.177658Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:29:41.256154Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:29:41.299903Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:29:41.299937Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.310027Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:29:41.310823Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:29:41.310836Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.312665Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:29:41.393084Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:29:41.396339Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:29:41.396359Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.399656Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:29:41.409881Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:29:41.497837Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:29:41.576790Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:29:41.577117Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:29:41.577145Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.640416Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:29:41.646149Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:29:41.652914Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:29:41.667330Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:29:41.668021Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:29:41.668035Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.669473Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:29:41.680654Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:29:41.685558Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:29:41.687758Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:29:41.689582Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:29:41.703137Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:29:41.732152Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:29:41.772186Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:29:41.800485Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:29:41.800508Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.812998Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:29:41.823235Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:29:41.847748Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:29:41.847769Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.854468Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:29:41.873280Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:29:41.882892Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:29:41.882915Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.901843Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:29:41.908588Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:29:41.908608Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:41.917110Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:29:41.919381Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:29:41.968712Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:29:41.968751Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:41.969928Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:29:41.969957Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:41.986897Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:29:42.011396Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:29:42.348183Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:29:42.383323Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:29:42.383365Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:42.444574Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:29:42.454098Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:29:42.582136Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:29:42.582170Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:42.641351Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:29:43.156483Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:29:43.156534Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:43.203461Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:29:43.848627Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:29:43.930055Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:29:43.930095Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:43.976744Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:29:43.976783Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:43.991908Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:29:44.081395Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=712 row_words=447 horizon=14529
2026-09-11T21:29:44.134708Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:29:44.134738Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:44.212023Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=712 row_words=447 horizon=14529
2026-09-11T21:29:45.194710Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:29:45.293161Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:29:45.293186Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:45.477387Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:29:47.356880Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:29:47.534087Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:29:47.534117Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:47.610817Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:29:50.681030Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:29:50.681084Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:51.213308Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=162 row_words=1526 horizon=14751
2026-09-11T21:29:53.741479Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:29:53.741523Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:29:54.220143Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=162 row_words=1526 horizon=14751
2026-09-11T21:29:54.320646Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=17010 success=true
2026-09-11T21:29:56.282965Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:29:56.337615Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:29:56.337639Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:56.378754Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:29:57.125089Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:29:57.153235Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:29:57.153269Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:57.192758Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:29:58.108057Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:29:58.140621Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:29:58.140652Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:29:58.178235Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:29:58.191362Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=23343 success=true
2026-09-11T21:29:58.246718Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=53 success=true
2026-09-11T21:29:58.250141Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:29:58.255806Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:29:58.411350Z  INFO local_candidate{attempt=6}: exchange table and repeat patch storage exchange_table_bytes=39896 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:29:59.967158Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=118 success=true
2026-09-11T21:29:59.967194Z  INFO local_candidate{attempt=6}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=14920 exchange_table_bytes=39896 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:29:59.967224Z  INFO local_candidate{attempt=6}: allocated package support memory linked_end=386240 profile_bytes=1060 exchange_table_bytes=39896 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=14920 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525348, 949168)]
2026-09-11T21:30:00.419104Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=451 success=true
2026-09-11T21:30:00.428069Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:30:00.431631Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:30:00.435667Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:30:00.436327Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:30:00.436340Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.437253Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:30:00.438339Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:30:00.438361Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:30:00.439036Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:00.439047Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.440901Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:30:00.445777Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:30:00.446947Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:30:00.446961Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:30:00.449704Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:30:00.450763Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:30:00.451290Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:30:00.451304Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.451630Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:30:00.452476Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:30:00.459362Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:30:00.465709Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:30:00.465730Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:30:00.466509Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:30:00.466521Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:30:00.467111Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:30:00.467827Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:30:00.467845Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.468018Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:30:00.468155Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:30:00.469606Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:30:00.477184Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:30:00.478574Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:30:00.478614Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:30:00.479079Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:30:00.479089Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.480199Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:30:00.487670Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:30:00.494351Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:30:00.494970Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:30:00.494979Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.496319Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:30:00.500304Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:30:00.505140Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:30:00.505492Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:30:00.505968Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:30:00.505982Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.506008Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:30:00.506027Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.507589Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:30:00.509632Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:30:00.517329Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:30:00.517611Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:30:00.517617Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.517818Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:30:00.518490Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:30:00.521126Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:30:00.521145Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.524524Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:30:00.526425Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:30:00.526459Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:30:00.527154Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:00.527168Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.529351Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:30:00.530372Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:30:00.531287Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2182 maximum_identical_destinations=1
2026-09-11T21:30:00.531301Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=6280 selected_horizon=6280 endpoint_lower_bound=5184 lower_bound_gap=1096 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.533340Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=53 row_words=38 horizon=6280
2026-09-11T21:30:00.592962Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:30:00.593001Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:00.602021Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:30:00.612065Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:30:00.618664Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:30:00.618683Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.625778Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:30:00.788393Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:30:00.790756Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:30:00.793479Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:30:00.795353Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:30:00.798555Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:30:00.798571Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.807635Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:30:00.808090Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:30:00.808109Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:30:00.812517Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:30:00.818866Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:30:00.818889Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.821872Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:30:00.821893Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:30:00.825529Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:30:00.829582Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:30:00.830666Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:30:00.830691Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.840634Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:30:00.841221Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:30:00.844095Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:30:00.845647Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:30:00.846789Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:30:00.848804Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:30:00.848837Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:00.849904Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:30:00.850544Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:00.850556Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.852100Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:30:00.855863Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:30:00.859369Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:30:00.872632Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:30:00.887176Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:30:00.892973Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:30:00.899906Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:30:00.930761Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:30:00.932146Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:30:00.932163Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.936106Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:30:00.960722Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:30:00.961710Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:30:00.961726Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:00.964644Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:30:00.999766Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:30:01.007440Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:30:01.007458Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.015190Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:30:01.056138Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:30:01.057152Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:01.057167Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.058964Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:30:01.120691Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:30:01.196250Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:30:01.216516Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:30:01.217341Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:30:01.217359Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.220297Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:30:01.235185Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:30:01.235816Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:30:01.235831Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.237401Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:30:01.253718Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:30:01.254351Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:01.254366Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.256501Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:30:01.374101Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:30:01.407861Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:30:01.407903Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:30:01.446425Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:30:01.448236Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:30:01.472588Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:30:01.472610Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.505486Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:30:01.531581Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:30:01.532113Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:30:01.532124Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.533338Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:30:01.666160Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:30:01.692974Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:30:01.692997Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.727584Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:30:01.808350Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:30:01.835539Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:30:01.835577Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:01.866968Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:30:02.330632Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:30:02.353365Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:30:02.372030Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:30:02.372056Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:02.374831Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:30:02.374854Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:02.395772Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:30:02.459392Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:30:02.715728Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:30:02.748837Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:30:02.765503Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:30:02.765526Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:02.796864Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:30:02.796892Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:02.823903Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:30:02.829337Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:30:03.109983Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:30:03.162923Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:30:03.162954Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6751 selected_horizon=6751 endpoint_lower_bound=5184 lower_bound_gap=1567 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:03.258626Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=154 row_words=925 horizon=6751
2026-09-11T21:30:03.784911Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:30:03.844596Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:30:03.844625Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:03.891825Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:30:03.921875Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9601 success=true
2026-09-11T21:30:03.953270Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:30:03.961188Z  INFO local_candidate{attempt=5}: costed final placed program final_cycles=13734213 final_exchange=6246056
2026-09-11T21:30:04.041233Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:30:04.041263Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:30:04.121001Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:30:04.121048Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:04.164038Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:30:04.174959Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:30:04.318385Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:30:04.318428Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:04.371576Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:30:05.050096Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=241 success=true
2026-09-11T21:30:05.066349Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:30:05.129179Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=79 success=true
2026-09-11T21:30:05.138332Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:30:05.165913Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:30:05.165950Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:05.222016Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:30:05.222052Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:05.262843Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:30:05.376050Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:30:05.545397Z  INFO local_candidate{attempt=5}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=371 success=true
2026-09-11T21:30:06.433886Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:30:06.433933Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:06.542678Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=712 row_words=447 horizon=14529
2026-09-11T21:30:06.656826Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:30:06.765510Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:30:06.765537Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:06.812282Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:30:06.917715Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:30:07.061298Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:30:07.061335Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:07.326696Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:30:08.389110Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:30:08.428006Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:30:08.428031Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:08.441046Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:30:08.826054Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:30:08.850338Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:30:08.850364Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:08.866136Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:30:13.214804Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=15023 success=true
2026-09-11T21:30:13.247501Z  INFO local_candidate{attempt=7}: costed final placed program final_cycles=13769286 final_exchange=6260933
2026-09-11T21:30:14.262822Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:30:14.262860Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:14.669688Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=162 row_words=1526 horizon=14751
2026-09-11T21:30:14.687576Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=182 success=true
2026-09-11T21:30:14.743900Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=14324 success=true
2026-09-11T21:30:14.806499Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=118 success=true
2026-09-11T21:30:15.459438Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=577 success=true
2026-09-11T21:30:26.323704Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11579 success=true
2026-09-11T21:30:26.354598Z  INFO local_candidate{attempt=6}: costed final placed program final_cycles=13749873 final_exchange=6241520
2026-09-11T21:30:27.805302Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=184 success=true
2026-09-11T21:30:27.927754Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=122 success=true
2026-09-11T21:30:28.558413Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=579 success=true
2026-09-11T21:30:30.108216Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=5 before=13870590 after=13734213 changed_operations=[9] opened_boundaries=[347]
2026-09-11T21:30:34.175732Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=2 threads=16
2026-09-11T21:30:41.418251Z  INFO local_candidate{attempt=7}: screened exchange table geometry expansion_ms=5972 expansion_and_footprint_ms=7242 estimated_row_bytes=69736 heuristic_row_bytes=140468 geometry_fragments_per_tile=7764 fragment_limit=16384
2026-09-11T21:30:41.564386Z  INFO local_candidate{attempt=7}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:30:42.056102Z  INFO local_candidate{attempt=6}: screened exchange table geometry expansion_ms=6545 expansion_and_footprint_ms=7880 estimated_row_bytes=69736 heuristic_row_bytes=140468 geometry_fragments_per_tile=7764 fragment_limit=16384
2026-09-11T21:30:42.186429Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:30:42.188266Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:30:42.189561Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:30:42.189732Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:30:42.190678Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:30:42.194742Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:30:42.195646Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:30:42.196276Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:30:42.196288Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.198435Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:30:42.200281Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:30:42.205914Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:30:42.206826Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:30:42.206845Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.208516Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:30:42.210803Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:30:42.211042Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:30:42.211574Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:30:42.211587Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.212853Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:30:42.215247Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:30:42.216905Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:30:42.216922Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:30:42.217882Z  INFO local_candidate{attempt=6}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:30:42.220093Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:30:42.220748Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:30:42.225695Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:30:42.226712Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:30:42.226724Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.227232Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:30:42.229178Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:30:42.229811Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:30:42.239641Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:30:42.241134Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:30:42.244399Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:30:42.244871Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:30:42.245486Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:30:42.245499Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:30:42.245514Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:30:42.245523Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.247428Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:30:42.248152Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:30:42.249227Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:30:42.250075Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:42.250087Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.250449Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:30:42.252239Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:30:42.253126Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:30:42.264162Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:30:42.264863Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:30:42.264876Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.266689Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:30:42.266809Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:30:42.266896Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:30:42.267501Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:30:42.267514Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.269900Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:30:42.289005Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:30:42.289959Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:30:42.289973Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.292104Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:30:42.303341Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:30:42.303768Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:30:42.303847Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.305647Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:30:42.317044Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:30:42.317487Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:30:42.317496Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.318804Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:30:42.330349Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:30:42.342426Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:30:42.345450Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:30:42.345467Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.348721Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:30:42.358269Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:30:42.358295Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:42.363456Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:30:42.364655Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:30:42.369908Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:30:42.369926Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.376962Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:30:42.433299Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:30:42.457959Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:30:42.457977Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:30:42.476780Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:30:42.484736Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:30:42.486725Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:30:42.486748Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:30:42.503281Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:30:42.511067Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:30:42.511088Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:42.527021Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:30:42.533749Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:30:42.554650Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:30:42.554666Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.564887Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:30:42.584791Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:30:42.585498Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:42.585510Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.587121Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:30:42.625828Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:30:42.631934Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:30:42.636143Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:30:42.636157Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.642630Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:30:42.658099Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:30:42.658133Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.676445Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:30:42.724706Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:30:42.738373Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:30:42.738397Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.758546Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:30:42.782230Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:30:42.782874Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:42.782884Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.784799Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:30:42.806989Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=12 transfers=2183 maximum_identical_destinations=1
2026-09-11T21:30:42.807008Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=12 initial_horizon=4816 selected_horizon=4816 endpoint_lower_bound=3456 lower_bound_gap=1360 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:42.809194Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=12 tile=127 row_words=31 horizon=4816
2026-09-11T21:30:42.816107Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:30:42.821380Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:30:42.827773Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:30:42.841039Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:30:42.841652Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:30:42.841665Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:42.843276Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:30:43.148444Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:30:43.169951Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:30:43.169975Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:43.198975Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:30:43.220127Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:30:43.220671Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:43.220680Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:43.221923Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:30:43.270934Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:30:43.503877Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:30:43.534990Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:30:43.535020Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:43.584799Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:30:43.627249Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:30:43.644661Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:30:43.645264Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:30:43.645278Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:43.647471Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:30:43.660355Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:30:43.660857Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:30:43.660866Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:43.662285Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:30:43.820451Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:30:43.821175Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:30:43.850674Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:30:43.850699Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:43.860033Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:30:43.860071Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:43.898395Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:30:43.905244Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:30:43.940014Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:30:43.978198Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:30:43.978253Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.071345Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:30:44.103881Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:30:44.104608Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:44.104621Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.106437Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:30:44.115688Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:30:44.262111Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:30:44.323817Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:30:44.323855Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.342543Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:30:44.575612Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:30:44.585848Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:30:44.605465Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:30:44.605494Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.612076Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:30:44.634476Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:30:44.640594Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:30:44.640627Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.655321Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:30:44.660893Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:30:44.660916Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.661071Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:30:44.663774Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:30:44.664475Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:30:44.664488Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.667142Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:30:44.681851Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:30:44.681992Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:30:44.682416Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:30:44.682430Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.682963Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:44.682975Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.684078Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:30:44.685062Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:30:44.692052Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:30:44.699326Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:30:44.702072Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:30:44.711866Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:30:44.713481Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:30:44.724568Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:30:44.727941Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:30:44.727963Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:30:44.744322Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:30:44.744983Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:30:44.744994Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.748006Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:30:44.758144Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:30:44.763880Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:30:44.764589Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:30:44.764601Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.766329Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:30:44.788593Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:30:44.788881Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:30:44.789665Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:30:44.789680Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.792038Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:30:44.803662Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:30:44.803930Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:30:44.804386Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:30:44.804398Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.804443Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:30:44.804452Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.806174Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:30:44.806295Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:30:44.818358Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:30:44.818836Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:30:44.818843Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.820196Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:30:44.829445Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:30:44.831396Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:30:44.899426Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:30:44.918402Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:30:44.918426Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.936288Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:30:44.983975Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:30:44.988831Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:30:44.988847Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:44.994545Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:30:45.022604Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:30:45.067625Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:30:45.067656Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:45.080323Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:30:45.080346Z  INFO local_candidate{attempt=7}: 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
2026-09-11T21:30:45.097947Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:30:45.100459Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:30:45.100487Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:45.108778Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:30:45.131356Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:30:45.461929Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:30:45.488592Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:30:45.488627Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:45.514039Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:30:45.530601Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:30:45.543928Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:30:45.543951Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:30:45.581805Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:30:45.625372Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:30:45.686777Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:30:45.686814Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:45.717919Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:30:46.045172Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:30:46.155505Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:30:46.155537Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:46.312826Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:30:46.335117Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:30:46.357906Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:30:46.357932Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:46.362783Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:30:46.376642Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:30:46.377029Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:30:46.377037Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:46.378555Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:30:46.379742Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:30:46.388003Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:30:46.388378Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:30:46.388388Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:46.389413Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:30:46.563524Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:30:46.563567Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:46.615106Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:30:46.629365Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:30:46.671743Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:30:46.671776Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:46.685854Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:30:46.695441Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:30:46.695460Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:30:46.711362Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:30:46.760133Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:30:46.800527Z  INFO local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:30:46.884660Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:30:46.884690Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:46.929000Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:30:46.958479Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:30:46.959106Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:46.959117Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:46.961079Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:30:46.977609Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:30:46.985085Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:30:46.985105Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:46.994861Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:30:47.007375Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:30:47.010571Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:30:47.012073Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:30:47.013224Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:30:47.022617Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:30:47.035454Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:30:47.038511Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:30:47.038528Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:47.041707Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:30:47.051639Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:30:47.404837Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:30:47.432118Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:30:47.432145Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:47.445171Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:30:47.606853Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:30:47.638020Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:30:47.638042Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:47.677034Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:30:47.705071Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:30:47.705777Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:47.705788Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:47.707472Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:30:47.721445Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:30:47.753322Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:30:47.753353Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:47.776313Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:30:47.777077Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:30:47.788458Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:30:47.788493Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:47.813922Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:30:47.815295Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:30:47.815310Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:30:47.818596Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:30:47.839793Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:30:47.840706Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:30:47.840717Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:30:47.842839Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:30:47.878283Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:30:47.912739Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:30:47.918653Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:30:47.919474Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:47.919487Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:47.921356Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:30:47.926555Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:30:47.971457Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:30:48.007060Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:30:48.007090Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:30:48.060103Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:30:48.133779Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:30:48.133819Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=33 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:48.139743Z  INFO local_candidate{attempt=6}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:30:48.181587Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:30:48.192910Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:30:48.192934Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:48.201752Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:30:48.201772Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=19 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:48.213709Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:30:48.234063Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=19 tile=13 row_words=355 horizon=7678
2026-09-11T21:30:48.245728Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=33 tile=707 row_words=445 horizon=14348
2026-09-11T21:30:48.251786Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:30:48.255935Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:30:48.260821Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:30:48.270943Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:30:48.271359Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:30:48.271368Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:48.272504Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:30:48.291099Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:30:48.291136Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=13 initial_horizon=6049 selected_horizon=6049 endpoint_lower_bound=3456 lower_bound_gap=2593 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:48.296816Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:30:48.297666Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:30:48.297680Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:48.300074Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:30:48.321719Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=12 transfers=1607 maximum_identical_destinations=1
2026-09-11T21:30:48.321740Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=12 initial_horizon=4918 selected_horizon=4918 endpoint_lower_bound=3456 lower_bound_gap=1462 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:48.323858Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=12 tile=56 row_words=32 horizon=4918
2026-09-11T21:30:48.353836Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:30:48.355455Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:30:48.355472Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:48.359078Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:30:48.383906Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:30:48.385029Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:30:48.385045Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:48.387748Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:30:48.434837Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=13 tile=79 row_words=897 horizon=6049
2026-09-11T21:30:48.620738Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:30:48.641298Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:30:48.688239Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:30:48.688265Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:48.736112Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:30:48.736156Z  INFO local_candidate{attempt=6}: 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
2026-09-11T21:30:48.746994Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:30:48.825400Z  INFO local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:30:48.870858Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:30:48.987418Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:30:48.987457Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:49.080900Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:30:49.106668Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:30:49.113980Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:30:49.114005Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:49.131772Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:30:49.131797Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:49.157935Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:30:49.160301Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:30:49.272154Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:30:49.404828Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:30:49.516286Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:30:49.516314Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:49.685125Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:30:49.722525Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:30:49.791723Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:30:49.791777Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:50.011354Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:30:50.392681Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:30:50.392713Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=16 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:50.430894Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=16 tile=79 row_words=268 horizon=13126
2026-09-11T21:30:50.784618Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:30:50.784658Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=15 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:50.826776Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=15 tile=964 row_words=285 horizon=7135
2026-09-11T21:30:50.986052Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:30:51.047146Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:30:51.047177Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:51.079263Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:30:51.867626Z  INFO local_candidate{attempt=6}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:30:51.952443Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:30:51.952475Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:30:52.025697Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:30:52.138189Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:30:52.138252Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=33 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:52.249388Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=33 tile=707 row_words=445 horizon=14348
2026-09-11T21:30:52.651684Z  INFO local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:30:52.837186Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:30:52.837237Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:52.923915Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:30:53.534238Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:30:53.534283Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=13 initial_horizon=5899 selected_horizon=5899 endpoint_lower_bound=3456 lower_bound_gap=2443 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:53.682716Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=13 tile=79 row_words=886 horizon=5899
2026-09-11T21:30:56.644705Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:30:56.644736Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=32 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:56.885014Z  INFO local_candidate{attempt=7}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:30:56.885074Z  INFO local_candidate{attempt=7}: optimized physical exchange schedule phase=32 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:57.038685Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=32 tile=109 row_words=1528 horizon=14869
2026-09-11T21:30:57.428340Z  INFO local_candidate{attempt=7}: finished large physical exchange phase phase=32 tile=109 row_words=1528 horizon=14869
2026-09-11T21:30:57.590770Z  INFO local_candidate{attempt=6}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:30:57.760822Z  INFO local_candidate{attempt=6}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:30:57.760854Z  INFO local_candidate{attempt=6}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:30:57.839337Z  INFO local_candidate{attempt=6}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:30:57.899005Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-11T21:30:57.904055Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-11T21:30:57.911334Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:30:57.915381Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=47 success=true
2026-09-11T21:30:57.920640Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=5 success=true
2026-09-11T21:30:57.928350Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:30:58.116651Z  INFO local_candidate{attempt=7}: exchange table and repeat patch storage exchange_table_bytes=40016 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:30:58.144750Z  INFO local_candidate{attempt=6}: exchange table and repeat patch storage exchange_table_bytes=39856 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:31:00.737039Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=258 success=true
2026-09-11T21:31:00.737093Z  INFO local_candidate{attempt=7}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=14840 exchange_table_bytes=40016 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:31:00.737094Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=265 success=true
2026-09-11T21:31:00.737111Z  INFO local_candidate{attempt=7}: allocated package support memory linked_end=386240 profile_bytes=1060 exchange_table_bytes=40016 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=14840 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525348, 949168)]
2026-09-11T21:31:00.737133Z  INFO local_candidate{attempt=6}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=14840 exchange_table_bytes=39856 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:31:00.737159Z  INFO local_candidate{attempt=6}: allocated package support memory linked_end=386240 profile_bytes=1060 exchange_table_bytes=39856 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=14840 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525348, 949168)]
2026-09-11T21:31:01.407068Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=669 success=true
2026-09-11T21:31:01.415475Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=678 success=true
2026-09-11T21:31:01.416733Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:31:01.430643Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:31:01.433481Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:31:01.434732Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:31:01.434753Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.435475Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:31:01.436605Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:31:01.436622Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.437313Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:31:01.440300Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:31:01.440915Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:31:01.441515Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:01.441549Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.444812Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:31:01.447114Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:31:01.449250Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:31:01.449286Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:31:01.453590Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:31:01.458637Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:31:01.460236Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:31:01.460254Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.462357Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:31:01.462966Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:31:01.463359Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:01.463379Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.465882Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:31:01.466094Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:31:01.467009Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:31:01.467027Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.469770Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:31:01.472254Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:31:01.473896Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:31:01.473917Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.476994Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:31:01.479609Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:31:01.481382Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=2183 maximum_identical_destinations=1
2026-09-11T21:31:01.481418Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4816 selected_horizon=4816 endpoint_lower_bound=3456 lower_bound_gap=1360 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.482077Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:31:01.483333Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:31:01.483357Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:31:01.483336Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:31:01.484898Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=127 row_words=31 horizon=4816
2026-09-11T21:31:01.486255Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:31:01.494383Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:31:01.495107Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:31:01.495150Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.495337Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:31:01.497570Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:31:01.499763Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:31:01.515482Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:31:01.516079Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:31:01.516091Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.516529Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:31:01.517962Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:31:01.518724Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:31:01.534511Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:31:01.535907Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:31:01.568824Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:31:01.570150Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:31:01.570168Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.574396Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:31:01.604719Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:31:01.619924Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:31:01.622248Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:31:01.622286Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:01.628680Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:31:01.628783Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:31:01.628805Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.629042Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:31:01.633722Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:31:01.635820Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:31:01.660661Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:31:01.661731Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:31:01.661751Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.665797Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:31:01.688545Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:31:01.689457Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:31:01.689477Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.691999Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:31:01.714391Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:31:01.719364Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:31:01.721677Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:31:01.723296Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:31:01.738788Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:31:01.768553Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:31:01.769563Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:01.769582Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.772734Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:31:01.785493Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:31:01.793618Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:31:01.796552Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:31:01.803936Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:31:01.818009Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:31:01.818025Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.829185Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:31:01.845266Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:31:01.845764Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:31:01.845772Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.846836Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:31:01.865940Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:31:01.868298Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:31:01.868319Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.873958Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:31:01.894994Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:31:01.911813Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:31:01.914692Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:31:01.916523Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:31:01.916541Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:01.920913Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:31:01.926237Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:31:01.926276Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:31:01.931471Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:31:01.931503Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:31:01.956612Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:31:01.978681Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:31:02.003861Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:31:02.439187Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:31:02.463169Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:31:02.463199Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:02.475434Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=104 row_words=187 horizon=8266
2026-09-11T21:31:02.499091Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:31:02.499784Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:02.499797Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:02.501517Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=146 row_words=20 horizon=8454
2026-09-11T21:31:02.643115Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:31:02.644630Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:31:02.666132Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:31:02.666158Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:02.681577Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:31:02.681616Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:02.702689Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:31:02.717128Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:31:02.739052Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:31:02.739606Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:02.739616Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:02.740983Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:31:02.789383Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:31:02.804958Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:31:02.805424Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:02.805433Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:02.806723Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:31:02.861396Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:31:02.863649Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:31:02.863665Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:02.866119Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:31:02.873772Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:31:03.112254Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:31:03.128955Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:31:03.136116Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:31:03.136138Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:03.149433Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:31:03.149458Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:03.159130Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:31:03.168249Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=1090 row_words=186 horizon=7433
2026-09-11T21:31:03.388543Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:31:03.388577Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:03.405857Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:31:03.486199Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:31:03.524593Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:31:03.524634Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:31:03.542635Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:31:03.580187Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:31:03.587489Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:31:03.587518Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:03.672281Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:31:03.799597Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:31:03.863446Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:31:03.863487Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:03.890521Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:31:03.893907Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:31:03.897339Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:31:03.897361Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:03.906247Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:31:04.001197Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:31:04.066292Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:31:04.066318Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:04.090230Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-11T21:31:04.098922Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:31:04.098968Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:04.106603Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=21 row_words=157 horizon=2904
2026-09-11T21:31:04.160034Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:31:04.364587Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:31:04.364637Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:04.374858Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1428 row_words=47 horizon=14502
2026-09-11T21:31:04.443099Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:31:04.478647Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:31:04.478690Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:04.496605Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:31:04.497952Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:31:04.497979Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:04.518331Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:31:04.518371Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:04.531876Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:31:04.543617Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:31:04.544178Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:31:04.571941Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:31:04.572785Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:04.572799Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:04.575011Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=22 row_words=23 horizon=2909
2026-09-11T21:31:04.656151Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:31:04.659338Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:31:04.659357Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:04.662833Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=723 row_words=30 horizon=2545
2026-09-11T21:31:04.673675Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:31:04.734389Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:31:04.831306Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:31:04.831348Z  INFO local_candidate{attempt=7}: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
2026-09-11T21:31:04.846884Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:31:04.856170Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:31:04.856198Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:31:04.870533Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:31:04.871819Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:31:04.922333Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:31:04.922364Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:04.937487Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:31:04.960270Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:31:04.972124Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:31:04.986857Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:31:04.986879Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:04.989484Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=235 row_words=253 horizon=1463
2026-09-11T21:31:05.000620Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:31:05.000648Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.004228Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:31:05.009886Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:31:05.020125Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:31:05.020599Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:31:05.021111Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:05.021126Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.022680Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=74 row_words=15 horizon=3625
2026-09-11T21:31:05.044364Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:31:05.058536Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:31:05.058928Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:31:05.058938Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.060531Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=866 row_words=10 horizon=471
2026-09-11T21:31:05.062496Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:31:05.062515Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:05.067882Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-11T21:31:05.070733Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:31:05.071122Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=45 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:31:05.071132Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=45 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.072242Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=45 tile=47 row_words=23 horizon=374
2026-09-11T21:31:05.077487Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:31:05.087904Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:31:05.088455Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:31:05.088465Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.089711Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=14 row_words=49 horizon=5913
2026-09-11T21:31:05.090711Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:31:05.095529Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:31:05.095551Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.110234Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=136 row_words=181 horizon=8747
2026-09-11T21:31:05.114264Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:31:05.114731Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=55 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:31:05.114739Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=55 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.116381Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=55 tile=866 row_words=10 horizon=471
2026-09-11T21:31:05.125700Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:31:05.126062Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=56 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:31:05.126069Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=56 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.126998Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=56 tile=47 row_words=23 horizon=374
2026-09-11T21:31:05.131975Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:31:05.136608Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:31:05.138418Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:31:05.145242Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:31:05.146263Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:31:05.153270Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:31:05.170548Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:31:05.171249Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:31:05.171263Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.173569Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=875 row_words=10 horizon=1112
2026-09-11T21:31:05.184520Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:31:05.184959Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:31:05.184966Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.186024Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=39 row_words=39 horizon=4006
2026-09-11T21:31:05.200765Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:31:05.201425Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:31:05.201435Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.202722Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=1104 row_words=41 horizon=172
2026-09-11T21:31:05.210376Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:31:05.210688Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:31:05.210694Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.211679Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=46 row_words=9 horizon=216
2026-09-11T21:31:05.219272Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:31:05.219556Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=67 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:31:05.219561Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=67 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.220351Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=67 tile=0 row_words=1028 horizon=2206
2026-09-11T21:31:05.227645Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:31:05.401848Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:31:05.401890Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:05.426255Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=127 row_words=165 horizon=16042
2026-09-11T21:31:05.563024Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:31:05.624288Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:31:05.629824Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:31:05.629850Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.632730Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:31:05.645898Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:31:05.645928Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.664707Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:31:05.681960Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:31:05.700943Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:31:05.702064Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:31:05.702081Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.705056Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1452 row_words=15 horizon=3578
2026-09-11T21:31:05.713263Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128162 maximum_identical_destinations=1
2026-09-11T21:31:05.713295Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=6049 selected_horizon=6049 endpoint_lower_bound=3456 lower_bound_gap=2593 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.726140Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:31:05.727056Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:31:05.727077Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:05.730420Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=684 row_words=18 horizon=5448
2026-09-11T21:31:05.850945Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=897 horizon=6049
2026-09-11T21:31:05.886802Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:31:05.890379Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:31:05.891868Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:31:05.893016Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:31:05.902106Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:31:05.977994Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:31:05.988428Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:31:05.988448Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:06.004611Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=535 row_words=106 horizon=4485
2026-09-11T21:31:06.059563Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:31:06.072702Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:31:06.089843Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:31:06.089881Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:06.110493Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:31:06.110525Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:31:06.122479Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:31:06.163002Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:31:06.208555Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:31:06.210128Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:31:06.210147Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:31:06.213985Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:31:06.237828Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:31:06.238863Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:31:06.238876Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:31:06.241187Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:31:06.295911Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:31:06.302836Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:31:06.312290Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:31:06.325060Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:31:06.325093Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:31:06.326504Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:31:06.337398Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:31:06.339729Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:31:06.341078Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:31:06.341102Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:06.344281Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=49 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:31:06.344304Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=49 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:06.353338Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=49 tile=32 row_words=134 horizon=7129
2026-09-11T21:31:06.362689Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:31:06.373688Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:31:06.373707Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:06.396767Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:31:06.435821Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=34 row_words=731 horizon=5250
2026-09-11T21:31:06.561912Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:31:06.561958Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:06.610187Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:31:06.898054Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:31:06.925599Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:31:06.925630Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:06.960650Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=356 row_words=177 horizon=850
2026-09-11T21:31:06.982169Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:31:06.982644Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:06.982653Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:06.983902Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=13 row_words=21 horizon=2978
2026-09-11T21:31:06.991600Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:31:07.031557Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:31:07.127118Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:31:07.127165Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:07.368601Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:31:07.427473Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:31:07.428186Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:07.428215Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=4464 selected_horizon=4464 endpoint_lower_bound=3456 lower_bound_gap=1008 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:07.430198Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=79 row_words=14 horizon=4464
2026-09-11T21:31:07.449012Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:31:07.449947Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=1607 maximum_identical_destinations=1
2026-09-11T21:31:07.449965Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4918 selected_horizon=4918 endpoint_lower_bound=3456 lower_bound_gap=1462 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:07.452339Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=56 row_words=32 horizon=4918
2026-09-11T21:31:07.532512Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:31:07.564683Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-11T21:31:07.572733Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:31:07.572759Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:07.617880Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:31:07.617916Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:07.619338Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=1095 row_words=136 horizon=822
2026-09-11T21:31:07.640540Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:31:07.645737Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:31:07.649135Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=480 row_words=519 horizon=10141
2026-09-11T21:31:07.652100Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=73
2026-09-11T21:31:07.665276Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:31:07.665822Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=70 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:31:07.665831Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=70 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:07.667326Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=70 tile=47 row_words=25 horizon=406
2026-09-11T21:31:07.944042Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:31:08.109146Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:31:08.109229Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:08.340605Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:31:08.375048Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:31:08.375083Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:08.391590Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:31:08.403929Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=96 row_words=112 horizon=2347
2026-09-11T21:31:08.648986Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=19 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:31:08.726282Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:31:08.726315Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:08.768407Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=13 row_words=351 horizon=7900
2026-09-11T21:31:09.144265Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:31:09.144302Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:09.174286Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=967 row_words=279 horizon=7032
2026-09-11T21:31:09.540897Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:31:09.552950Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:31:09.661600Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:31:09.661635Z  INFO local_candidate{attempt=6}: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
2026-09-11T21:31:09.682528Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:31:09.682555Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:09.747794Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:31:09.754642Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:31:09.788513Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:31:09.794531Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:31:09.871572Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:31:09.871607Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:09.907969Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:31:09.908002Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:10.074015Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=324 row_words=455 horizon=1906
2026-09-11T21:31:10.136034Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=553 row_words=658 horizon=2731
2026-09-11T21:31:10.412985Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:31:10.413023Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:10.494755Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=712 row_words=447 horizon=14529
2026-09-11T21:31:10.535639Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:31:10.535681Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:10.539281Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:31:10.578434Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=79 row_words=265 horizon=14267
2026-09-11T21:31:10.610133Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:31:10.610162Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=5899 selected_horizon=5899 endpoint_lower_bound=3456 lower_bound_gap=2443 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:10.749169Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=886 horizon=5899
2026-09-11T21:31:10.850861Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=14
2026-09-11T21:31:10.940835Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:31:10.940866Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:11.024506Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=79 row_words=630 horizon=12637
2026-09-11T21:31:11.690045Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:31:11.690091Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:11.802574Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=712 row_words=447 horizon=14529
2026-09-11T21:31:15.517197Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:31:15.652242Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:31:15.652272Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:15.723229Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:31:18.253030Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:31:18.253074Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:18.723373Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=162 row_words=1526 horizon=14751
2026-09-11T21:31:18.798342Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=17391 success=true
2026-09-11T21:31:20.936181Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:31:20.936235Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=14751 selected_horizon=14751 endpoint_lower_bound=6016 lower_bound_gap=8735 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:21.429990Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=162 row_words=1526 horizon=14751
2026-09-11T21:31:21.511291Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=20095 success=true
2026-09-11T21:31:30.937725Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12139 success=true
2026-09-11T21:31:30.966078Z  INFO local_candidate{attempt=7}: costed final placed program final_cycles=13651053 final_exchange=6183038
2026-09-11T21:31:32.407639Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=183 success=true
2026-09-11T21:31:32.517340Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=109 success=true
2026-09-11T21:31:33.132182Z  INFO local_candidate{attempt=7}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=567 success=true
2026-09-11T21:31:34.709674Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13198 success=true
2026-09-11T21:31:34.762959Z  INFO local_candidate{attempt=6}: costed final placed program final_cycles=13649757 final_exchange=6181742
2026-09-11T21:31:36.250540Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=184 success=true
2026-09-11T21:31:36.374311Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=123 success=true
2026-09-11T21:31:37.020551Z  INFO local_candidate{attempt=6}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=595 success=true
2026-09-11T21:31:38.704653Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=6 before=13734213 after=13649757 changed_operations=[10] opened_boundaries=[348]
2026-09-11T21:31:42.482404Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=1 threads=16
2026-09-11T21:31:47.844747Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: screened exchange table geometry expansion_ms=4453 expansion_and_footprint_ms=5362 estimated_row_bytes=69696 heuristic_row_bytes=139672 geometry_fragments_per_tile=7762 fragment_limit=16384
2026-09-11T21:31:47.964419Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: eliminated unread FP8 cast input padding clears removed=612
2026-09-11T21:31:48.507915Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=54 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:31:48.507963Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=54 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.509165Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=43 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:31:48.509226Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=43 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.510828Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=54 tile=866 row_words=10 horizon=471
2026-09-11T21:31:48.512380Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=43 tile=866 row_words=10 horizon=471
2026-09-11T21:31:48.516181Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=46 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:31:48.516237Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=46 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.517986Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=46 tile=14 row_words=49 horizon=5913
2026-09-11T21:31:48.528617Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=55 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:31:48.528640Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=55 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.528893Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:48.528934Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=38 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.529291Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:31:48.530235Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=55 tile=47 row_words=23 horizon=374
2026-09-11T21:31:48.530404Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=44 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:31:48.530420Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=44 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.531061Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:31:48.531079Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:48.532022Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=44 tile=47 row_words=23 horizon=374
2026-09-11T21:31:48.532879Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=38 tile=146 row_words=20 horizon=8454
2026-09-11T21:31:48.535459Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:31:48.552726Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=42 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-11T21:31:48.561326Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:31:48.562431Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:31:48.562447Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:48.565162Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:31:48.568521Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:31:48.570370Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=59 candidates=32 ordinary_horizon=210 paired_horizon=1250 use_paired=false
2026-09-11T21:31:48.578338Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:48.578364Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=41 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.580546Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=41 tile=74 row_words=15 horizon=3625
2026-09-11T21:31:48.583535Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:31:48.593151Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=61 candidates=35 ordinary_horizon=660 paired_horizon=2329 use_paired=false
2026-09-11T21:31:48.616907Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=62 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:31:48.616941Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:48.619835Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=62 tile=875 row_words=10 horizon=1112
2026-09-11T21:31:48.639738Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=63 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:31:48.639768Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=63 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.641429Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=63 tile=39 row_words=39 horizon=4006
2026-09-11T21:31:48.674070Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=64 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:31:48.674107Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=64 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.676470Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=64 tile=1104 row_words=41 horizon=172
2026-09-11T21:31:48.689019Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=65 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:31:48.689039Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=65 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.690750Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=65 tile=46 row_words=9 horizon=216
2026-09-11T21:31:48.755958Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=66 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:31:48.755995Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=66 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:48.757429Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=66 tile=0 row_words=1028 horizon=2206
2026-09-11T21:31:48.779970Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=67 candidates=19 ordinary_horizon=2258 paired_horizon=2382 use_paired=false
2026-09-11T21:31:48.794367Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:31:48.806003Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:31:48.806030Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:48.826782Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:31:48.902608Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:31:48.942597Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:31:48.942655Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:48.997983Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:31:49.176273Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:31:49.212445Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:31:49.212484Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:49.237403Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:31:49.492596Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:31:49.492643Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:49.500808Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-11T21:31:49.536542Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-11T21:31:49.536571Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=11 initial_horizon=5526 selected_horizon=5526 endpoint_lower_bound=3456 lower_bound_gap=2070 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:49.539540Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=11 tile=169 row_words=26 horizon=5526
2026-09-11T21:31:49.544027Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=16 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:31:49.544066Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=16 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:49.565364Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=39 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:31:49.565402Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=39 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:49.573559Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=16 tile=96 row_words=112 horizon=2347
2026-09-11T21:31:49.613850Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=39 tile=1090 row_words=186 horizon=7433
2026-09-11T21:31:49.685049Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=37 candidates=6561 ordinary_horizon=8266 paired_horizon=8051 use_paired=false
2026-09-11T21:31:49.685868Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:31:49.685904Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:49.689409Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=22 tile=723 row_words=30 horizon=2545
2026-09-11T21:31:49.736649Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=37 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:31:49.736687Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=37 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:49.752905Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=37 tile=104 row_words=187 horizon=8266
2026-09-11T21:31:49.803626Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:31:49.849592Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:31:49.849623Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:49.902474Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:31:49.936102Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=69 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:31:49.936134Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=69 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:49.937801Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=69 tile=47 row_words=25 horizon=406
2026-09-11T21:31:50.071345Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=47 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:31:50.071388Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=47 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.071850Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:31:50.071885Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:50.102289Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=24 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:31:50.102342Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=24 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.117024Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=24 tile=136 row_words=181 horizon=8747
2026-09-11T21:31:50.121834Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-11T21:31:50.138685Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=47 tile=34 row_words=731 horizon=5250
2026-09-11T21:31:50.184687Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=53 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-11T21:31:50.269570Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=15 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:31:50.269612Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=15 initial_horizon=13126 selected_horizon=13126 endpoint_lower_bound=8704 lower_bound_gap=4422 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.300798Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=48 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:31:50.300832Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=48 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.306733Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=25 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:31:50.306770Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=25 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.307403Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=48 tile=32 row_words=134 horizon=7129
2026-09-11T21:31:50.325460Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=34 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:50.325481Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=34 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.326817Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=34 tile=13 row_words=21 horizon=2978
2026-09-11T21:31:50.329088Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=15 tile=79 row_words=268 horizon=13126
2026-09-11T21:31:50.330125Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=25 tile=127 row_words=165 horizon=16042
2026-09-11T21:31:50.369571Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:31:50.369600Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:50.371718Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-11T21:31:50.388005Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=29 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:31:50.388039Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=29 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.391323Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=29 tile=684 row_words=18 horizon=5448
2026-09-11T21:31:50.435976Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:31:50.436012Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:50.457759Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-11T21:31:50.463499Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=26 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:31:50.463527Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=26 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.472905Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=26 tile=1428 row_words=47 horizon=14502
2026-09-11T21:31:50.503519Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=28 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:31:50.503547Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=28 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:50.507496Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=28 tile=1452 row_words=15 horizon=3578
2026-09-11T21:31:51.192791Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:31:51.192831Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:51.252378Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-11T21:31:51.282138Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=40 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:31:51.282197Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=40 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:51.368421Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=33 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:31:51.368466Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=33 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:51.376347Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=40 tile=235 row_words=253 horizon=1463
2026-09-11T21:31:51.404511Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:31:51.404550Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:51.413854Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=33 tile=1095 row_words=136 horizon=822
2026-09-11T21:31:51.457077Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-11T21:31:51.466724Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=7678 paired_horizon=13815 use_paired=false
2026-09-11T21:31:51.549279Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=18 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:31:51.549321Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=18 initial_horizon=7678 selected_horizon=7678 endpoint_lower_bound=4656 lower_bound_gap=3022 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:51.593115Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=18 tile=13 row_words=355 horizon=7678
2026-09-11T21:31:52.184125Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:31:52.242196Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:31:52.261197Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:31:52.261253Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:31:52.297238Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:31:52.331633Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:31:52.331664Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: 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
2026-09-11T21:31:52.451251Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=32 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:31:52.451288Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=32 initial_horizon=14348 selected_horizon=14348 endpoint_lower_bound=9072 lower_bound_gap=5276 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:52.466869Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:31:52.532561Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=32 tile=707 row_words=445 horizon=14348
2026-09-11T21:31:52.691996Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=30 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:31:52.692043Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=30 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:52.731315Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=30 tile=480 row_words=519 horizon=10141
2026-09-11T21:31:55.173993Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=12 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:31:55.174040Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=12 initial_horizon=5648 selected_horizon=5648 endpoint_lower_bound=3456 lower_bound_gap=2192 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:55.354741Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=12 tile=159 row_words=892 horizon=5648
2026-09-11T21:31:55.818270Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=68 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:31:55.818318Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=68 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:55.986406Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=27 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:31:55.986458Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=27 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:56.101710Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=68 tile=324 row_words=455 horizon=1906
2026-09-11T21:31:56.212342Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=27 tile=553 row_words=658 horizon=2731
2026-09-11T21:31:58.815990Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=31 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:31:58.816033Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=31 initial_horizon=14869 selected_horizon=14869 endpoint_lower_bound=6016 lower_bound_gap=8853 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:58.839899Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28010 use_paired=false
2026-09-11T21:31:59.007135Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:31:59.007175Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:31:59.074979Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:31:59.337033Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: finished large physical exchange phase phase=31 tile=109 row_words=1528 horizon=14869
2026-09-11T21:31:59.448711Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=26 success=true
2026-09-11T21:31:59.451819Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-11T21:31:59.457466Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-11T21:31:59.593011Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: exchange table and repeat patch storage exchange_table_bytes=39864 maximum_uncompressed_repeat_patch_bytes=2160 maximum_elided_arithmetic_patch_bytes=2160
2026-09-11T21:32:01.163556Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=124 success=true
2026-09-11T21:32:01.163642Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: placing generated tile programs linked_end=386240 host_code_base=386240 host_code_bytes=9092 generated_code_bytes=14712 exchange_table_bytes=39864 executable_ranges=[(377228, 377232), (377628, 377632), (378372, 378376), (379116, 379120), (381516, 381520), (383252, 383256), (385268, 385272), (395400, 524288)]
2026-09-11T21:32:01.163681Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: allocated package support memory linked_end=386240 profile_bytes=1056 exchange_table_bytes=39864 host_code_bytes=9092 host_data_bytes=6280 generated_code_bytes=14712 code_address=395400 available_ranges=[(327680, 360448), (368488, 376832), (475136, 524288), (525344, 949168)]
2026-09-11T21:32:01.609423Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=445 success=true
2026-09-11T21:32:01.622229Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-11T21:32:01.627636Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-11T21:32:01.633707Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-11T21:32:01.634511Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:32:01.634525Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.636584Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=13 row_words=21 horizon=2978
2026-09-11T21:32:01.659779Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-11T21:32:01.662055Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-11T21:32:01.662079Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:01.667691Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-11T21:32:01.688519Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-11T21:32:01.697542Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-11T21:32:01.700828Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-11T21:32:01.700852Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:01.702934Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-11T21:32:01.704381Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=30 horizon=2545
2026-09-11T21:32:01.704417Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-11T21:32:01.704437Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:01.707948Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-11T21:32:01.714782Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-11T21:32:01.715742Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-11T21:32:01.718803Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-11T21:32:01.719980Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-11T21:32:01.719999Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=5526 selected_horizon=5526 endpoint_lower_bound=3456 lower_bound_gap=2070 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.722822Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=169 row_words=26 horizon=5526
2026-09-11T21:32:01.738384Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=29
2026-09-11T21:32:01.738612Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-11T21:32:01.739291Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=2198 maximum_identical_destinations=1
2026-09-11T21:32:01.739307Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=5448 selected_horizon=5448 endpoint_lower_bound=2152 lower_bound_gap=3296 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.739439Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:32:01.739454Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:01.741694Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=684 row_words=18 horizon=5448
2026-09-11T21:32:01.742057Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-11T21:32:01.776679Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-11T21:32:01.778055Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=2820 maximum_identical_destinations=1
2026-09-11T21:32:01.778074Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.781771Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=1452 row_words=15 horizon=3578
2026-09-11T21:32:01.834215Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-11T21:32:01.834753Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=54 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:32:01.834767Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=54 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.836630Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=54 tile=866 row_words=10 horizon=471
2026-09-11T21:32:01.848667Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-11T21:32:01.849145Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=55 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:32:01.849156Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=55 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.850305Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=55 tile=47 row_words=23 horizon=374
2026-09-11T21:32:01.856995Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-11T21:32:01.863634Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-11T21:32:01.866141Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-11T21:32:01.875067Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-11T21:32:01.876525Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-11T21:32:01.885325Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-11T21:32:01.901419Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-11T21:32:01.902017Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1438 maximum_identical_destinations=1
2026-09-11T21:32:01.902029Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:01.904193Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=875 row_words=10 horizon=1112
2026-09-11T21:32:01.907938Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-11T21:32:01.917816Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-11T21:32:01.918417Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1400 maximum_identical_destinations=1
2026-09-11T21:32:01.918429Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=4006 selected_horizon=4006 endpoint_lower_bound=3920 lower_bound_gap=86 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.919236Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-11T21:32:01.919255Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:01.919641Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=39 row_words=39 horizon=4006
2026-09-11T21:32:01.936008Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-11T21:32:01.938463Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-11T21:32:01.939327Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=64 transfers=2151 maximum_identical_destinations=1
2026-09-11T21:32:01.939342Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=64 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.940983Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=64 tile=1104 row_words=41 horizon=172
2026-09-11T21:32:01.950839Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-11T21:32:01.951284Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=65 transfers=1075 maximum_identical_destinations=1
2026-09-11T21:32:01.951293Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=65 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.952589Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=65 tile=46 row_words=9 horizon=216
2026-09-11T21:32:01.962694Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=66
2026-09-11T21:32:01.963100Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=66 transfers=1023 maximum_identical_destinations=1
2026-09-11T21:32:01.963108Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=66 initial_horizon=2206 selected_horizon=2206 endpoint_lower_bound=2148 lower_bound_gap=58 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:01.964133Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=66 tile=0 row_words=1028 horizon=2206
2026-09-11T21:32:01.974093Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=67
2026-09-11T21:32:01.999867Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-11T21:32:02.032125Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-11T21:32:02.032146Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:02.070687Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-11T21:32:02.088759Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-11T21:32:02.103009Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-11T21:32:02.103754Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1741 maximum_identical_destinations=1
2026-09-11T21:32:02.103770Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5913 selected_horizon=5913 endpoint_lower_bound=4644 lower_bound_gap=1269 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.105400Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=14 row_words=49 horizon=5913
2026-09-11T21:32:02.155268Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=24
2026-09-11T21:32:02.170089Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-11T21:32:02.181318Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=4374 maximum_identical_destinations=1
2026-09-11T21:32:02.181341Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8747 selected_horizon=8747 endpoint_lower_bound=7872 lower_bound_gap=875 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.194742Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=136 row_words=181 horizon=8747
2026-09-11T21:32:02.202613Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=6561 maximum_identical_destinations=1
2026-09-11T21:32:02.202637Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=8266 selected_horizon=8266 endpoint_lower_bound=5248 lower_bound_gap=3018 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.220497Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=104 row_words=187 horizon=8266
2026-09-11T21:32:02.251369Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-11T21:32:02.252342Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=38 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:32:02.252366Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=38 initial_horizon=8454 selected_horizon=8454 endpoint_lower_bound=4608 lower_bound_gap=3846 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.254789Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=38 tile=146 row_words=20 horizon=8454
2026-09-11T21:32:02.294104Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-11T21:32:02.318630Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=42920 maximum_identical_destinations=1
2026-09-11T21:32:02.318659Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=1359 selected_horizon=1359 endpoint_lower_bound=640 lower_bound_gap=719 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.329063Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-11T21:32:02.340758Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=297 row_words=174 horizon=1359
2026-09-11T21:32:02.342562Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-11T21:32:02.342582Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:02.364232Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-11T21:32:02.511295Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=10001 maximum_identical_destinations=1
2026-09-11T21:32:02.511339Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=16042 selected_horizon=16042 endpoint_lower_bound=8576 lower_bound_gap=7466 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:32:02.521655Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=8694 maximum_identical_destinations=1
2026-09-11T21:32:02.521697Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:32:02.531519Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=1428 row_words=47 horizon=14502
2026-09-11T21:32:02.534669Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=127 row_words=165 horizon=16042
2026-09-11T21:32:02.551326Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-11T21:32:02.555641Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-11T21:32:02.557345Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-11T21:32:02.558743Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-11T21:32:02.565857Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-11T21:32:02.570416Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-11T21:32:02.581188Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=70
2026-09-11T21:32:02.583951Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-11T21:32:02.584566Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=1294 maximum_identical_destinations=1
2026-09-11T21:32:02.584583Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.587012Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=866 row_words=10 horizon=471
2026-09-11T21:32:02.588089Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=71
2026-09-11T21:32:02.596404Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=72
2026-09-11T21:32:02.600700Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-11T21:32:02.601275Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=1224 maximum_identical_destinations=1
2026-09-11T21:32:02.601289Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.602757Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=47 row_words=23 horizon=374
2026-09-11T21:32:02.670902Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-11T21:32:02.704898Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=33 transfers=51925 maximum_identical_destinations=1
2026-09-11T21:32:02.704932Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=33 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.744920Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=33 tile=1095 row_words=136 horizon=822
2026-09-11T21:32:02.775161Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-11T21:32:02.776152Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=41 transfers=1457 maximum_identical_destinations=1
2026-09-11T21:32:02.776176Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=41 initial_horizon=3625 selected_horizon=3625 endpoint_lower_bound=2304 lower_bound_gap=1321 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.779096Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=41 tile=74 row_words=15 horizon=3625
2026-09-11T21:32:02.795458Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=69
2026-09-11T21:32:02.796010Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=69 transfers=1368 maximum_identical_destinations=1
2026-09-11T21:32:02.796024Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=69 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:02.797449Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=69 tile=47 row_words=25 horizon=406
2026-09-11T21:32:02.853878Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-11T21:32:02.893484Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:32:02.893513Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:02.943901Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-11T21:32:02.980900Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-11T21:32:02.987015Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-11T21:32:02.987047Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:02.994475Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-11T21:32:03.010540Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-11T21:32:03.046609Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-11T21:32:03.046639Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:03.096946Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-11T21:32:03.099880Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-11T21:32:03.127614Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=45090 maximum_identical_destinations=1
2026-09-11T21:32:03.127639Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:03.161445Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-11T21:32:03.168695Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=48 transfers=12492 maximum_identical_destinations=1
2026-09-11T21:32:03.168716Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=48 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:03.169239Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=1090 row_words=186 horizon=7433
2026-09-11T21:32:03.177539Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=48 tile=32 row_words=134 horizon=7129
2026-09-11T21:32:03.252025Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-11T21:32:03.276562Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=43760 maximum_identical_destinations=1
2026-09-11T21:32:03.276590Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2347 selected_horizon=2347 endpoint_lower_bound=1960 lower_bound_gap=387 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:03.302724Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=96 row_words=112 horizon=2347
2026-09-11T21:32:03.550120Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=30
2026-09-11T21:32:03.597421Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=19683 maximum_identical_destinations=1
2026-09-11T21:32:03.597457Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10141 selected_horizon=10141 endpoint_lower_bound=9760 lower_bound_gap=381 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:03.634169Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=480 row_words=519 horizon=10141
2026-09-11T21:32:03.970837Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-11T21:32:04.014662Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=47 transfers=69179 maximum_identical_destinations=1
2026-09-11T21:32:04.014701Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=47 initial_horizon=5250 selected_horizon=5250 endpoint_lower_bound=4464 lower_bound_gap=786 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:04.108659Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=47 tile=34 row_words=731 horizon=5250
2026-09-11T21:32:04.618135Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-11T21:32:04.685044Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=103635 maximum_identical_destinations=1
2026-09-11T21:32:04.685079Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:04.776083Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=235 row_words=253 horizon=1463
2026-09-11T21:32:05.038013Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-11T21:32:05.051377Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-11T21:32:05.133912Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-11T21:32:05.133950Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:05.144279Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-11T21:32:05.144309Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: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
2026-09-11T21:32:05.236059Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-11T21:32:05.305004Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-11T21:32:05.516302Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71168 maximum_identical_destinations=1
2026-09-11T21:32:05.516342Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=14267 selected_horizon=14267 endpoint_lower_bound=8704 lower_bound_gap=5563 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:32:05.565655Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=265 horizon=14267
2026-09-11T21:32:05.637833Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-11T21:32:05.637876Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7032 selected_horizon=7032 endpoint_lower_bound=3240 lower_bound_gap=3792 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:32:05.680058Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=967 row_words=279 horizon=7032
2026-09-11T21:32:06.208933Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=7900 paired_horizon=13818 use_paired=false
2026-09-11T21:32:06.271370Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8673 maximum_identical_destinations=1
2026-09-11T21:32:06.271403Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=7900 selected_horizon=7900 endpoint_lower_bound=4656 lower_bound_gap=3244 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:32:06.302803Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=13 row_words=351 horizon=7900
2026-09-11T21:32:06.727972Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-11T21:32:06.857283Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=195689 maximum_identical_destinations=1
2026-09-11T21:32:06.857324Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:07.084360Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=553 row_words=658 horizon=2731
2026-09-11T21:32:07.127483Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=112284 maximum_identical_destinations=1
2026-09-11T21:32:07.127526Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=14529 selected_horizon=14529 endpoint_lower_bound=9072 lower_bound_gap=5457 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:32:07.237773Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=712 row_words=447 horizon=14529
2026-09-11T21:32:08.278319Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=68
2026-09-11T21:32:08.413867Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=68 transfers=301599 maximum_identical_destinations=1
2026-09-11T21:32:08.413899Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=68 initial_horizon=1906 selected_horizon=1906 endpoint_lower_bound=896 lower_bound_gap=1010 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:08.682284Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=68 tile=324 row_words=455 horizon=1906
2026-09-11T21:32:11.504711Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=15948 paired_horizon=28102 use_paired=false
2026-09-11T21:32:11.684111Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9663 maximum_identical_destinations=1
2026-09-11T21:32:11.684164Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=15948 selected_horizon=15948 endpoint_lower_bound=9856 lower_bound_gap=6092 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:32:11.773481Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=13 row_words=645 horizon=15948
2026-09-11T21:32:12.516065Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-11T21:32:12.603032Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128060 maximum_identical_destinations=1
2026-09-11T21:32:12.603066Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=5648 selected_horizon=5648 endpoint_lower_bound=3456 lower_bound_gap=2192 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:12.744291Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=159 row_words=892 horizon=5648
2026-09-11T21:32:17.659068Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=303406 maximum_identical_destinations=1
2026-09-11T21:32:17.659125Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=14747 selected_horizon=14747 endpoint_lower_bound=6016 lower_bound_gap=8731 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-11T21:32:18.158766Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=109 row_words=1526 horizon=14747
2026-09-11T21:32:20.483006Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-11T21:32:20.535911Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=7290 maximum_identical_destinations=1
2026-09-11T21:32:20.535941Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6573 selected_horizon=6573 endpoint_lower_bound=5888 lower_bound_gap=685 selected_kind="reused" neighborhood_improvements=0
2026-09-11T21:32:20.557357Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=45 row_words=337 horizon=6573
2026-09-11T21:32:20.570097Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18960 success=true
2026-09-11T21:32:31.482081Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10911 success=true
2026-09-11T21:32:31.511900Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}: costed final placed program final_cycles=13474365 final_exchange=6060782
2026-09-11T21:32:32.967796Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=201 success=true
2026-09-11T21:32:33.079232Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=111 success=true
2026-09-11T21:32:33.717762Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:local_candidate{attempt=7}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=585 success=true
2026-09-11T21:32:34.192748Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=7 before=13649757 after=13474365 changed_operations=[6, 7, 8] opened_boundaries=[346]
2026-09-11T21:32:36.537880Z  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=836894 success=true
2026-09-11T21:32:37.137642Z  INFO writing application package tiles=1472
2026-09-11T21:32:37.636214Z  INFO application package written
2026-09-11T21:32:37.643448Z  INFO reading application package
2026-09-11T21:32:38.665977Z  INFO application package read tiles=1472 compiler=0.1.0
2026-09-11T21:32:38.688530Z  INFO waiting for hardware ownership path=artifacts/layout-sweep/device.lock
2026-09-11T21:32:38.688559Z  INFO acquired hardware ownership path=artifacts/layout-sweep/device.lock
2026-09-11T21:32:38.688573Z  INFO opening IPU device path="/dev/ipu0"
2026-09-11T21:32:38.688604Z  INFO IPU device attached path=/dev/ipu0
2026-09-11T21:32:38.688610Z  INFO initializing IPU device
2026-09-11T21:32:38.696392Z  INFO IPU device initialized
2026-09-11T21:32:38.696398Z  INFO replaying device configuration register_writes=2003
2026-09-11T21:32:38.731333Z  INFO loading application tile_count=1472 final_mark=23
2026-09-11T21:32:38.955980Z  INFO application loaded and initial synchronization completed tile_count=1472
2026-09-11T21:32:42.330524Z  INFO prepared reference inputs elapsed_ms=3371
2026-09-11T21:32:42.331141Z  INFO configured host reference BLAS threads=4
referencePrecision=fp32
2026-09-11T21:33:03.011877Z  INFO evaluated host reference elapsed_ms=20681
2026-09-11T21:33:03.018330Z  INFO starting host exchange session startup_mark=23
2026-09-11T21:33:03.018354Z  INFO attaching host exchange pages pages=2
2026-09-11T21:33:03.019027Z  INFO host exchange session started
2026-09-11T21:33:03.020095Z  INFO invoking streaming host exchange call call="initialize" command=0 phases=342
2026-09-11T21:33:03.367235Z DEBUG host phases: (phase, ready, copy, acknowledge, wait) microseconds call="initialize" elapsed_us=347110 input_bytes=430052224 output_bytes=0 input_batches=171 output_batches=0 timings=[(0, 1, 1070, 0, 0), (1, 0, 0, 0, 183), (2, 0, 2035, 0, 159), (3, 0, 0, 0, 155), (4, 0, 6041, 0, 161), (5, 0, 0, 0, 156), (6, 0, 3395, 0, 160), (7, 0, 0, 0, 311), (8, 0, 1026, 0, 158), (9, 0, 0, 0, 311), (10, 0, 4830, 0, 159), (11, 0, 0, 0, 312), (12, 0, 5350, 0, 158), (13, 0, 0, 0, 312), (14, 0, 5588, 0, 159), (15, 0, 0, 0, 311), (16, 0, 5164, 0, 159), (17, 0, 0, 0, 312), (18, 0, 5501, 0, 160), (19, 0, 0, 0, 312), (20, 0, 3024, 0, 159), (21, 0, 0, 0, 311), (22, 0, 5355, 0, 158), (23, 0, 0, 0, 311), (24, 0, 3408, 0, 159), (25, 0, 0, 0, 312), (26, 0, 2572, 0, 158), (27, 0, 0, 0, 312), (28, 0, 2561, 0, 126), (29, 0, 0, 0, 311), (30, 0, 2750, 0, 159), (31, 0, 0, 0, 311), (32, 0, 2594, 0, 158), (33, 0, 0, 0, 311), (34, 0, 2569, 0, 158), (35, 0, 0, 0, 311), (36, 0, 2588, 0, 159), (37, 0, 0, 0, 311), (38, 0, 2560, 0, 159), (39, 0, 0, 0, 310), (40, 0, 2565, 0, 159), (41, 0, 0, 0, 310), (42, 0, 2552, 0, 159), (43, 0, 0, 0, 310), (44, 0, 2562, 0, 159), (45, 0, 0, 0, 311), (46, 0, 3737, 0, 158), (47, 0, 0, 0, 312), (48, 0, 4636, 0, 159), (49, 0, 0, 0, 303), (50, 0, 2585, 0, 158), (51, 0, 0, 0, 312), (52, 0, 2588, 0, 159), (53, 0, 0, 0, 311), (54, 0, 2548, 0, 168), (55, 0, 0, 0, 311), (56, 0, 2543, 0, 145), (57, 0, 0, 0, 311), (58, 0, 1370, 0, 158), (59, 0, 0, 0, 149), (60, 0, 1376, 0, 159), (61, 0, 0, 0, 155), (62, 0, 1374, 0, 158), (63, 0, 0, 0, 156), (64, 0, 1199, 0, 158), (65, 0, 0, 0, 155), (66, 0, 1374, 0, 158), (67, 0, 0, 0, 156), (68, 0, 1205, 0, 159), (69, 0, 0, 0, 156), (70, 0, 1029, 0, 158), (71, 0, 0, 0, 155), (72, 0, 1043, 0, 158), (73, 0, 0, 0, 156), (74, 0, 1030, 0, 149), (75, 0, 0, 0, 156), (76, 0, 1060, 0, 158), (77, 0, 0, 0, 155), (78, 0, 1053, 0, 159), (79, 0, 0, 0, 155), (80, 0, 1187, 0, 158), (81, 0, 0, 0, 155), (82, 0, 1108, 0, 186), (83, 1, 0, 0, 185), (84, 1, 2209, 1, 174), (85, 0, 0, 0, 162), (86, 0, 2035, 0, 159), (87, 0, 0, 0, 155), (88, 0, 1027, 0, 182), (89, 0, 0, 0, 159), (90, 0, 1062, 0, 160), (91, 0, 0, 0, 156), (92, 0, 1043, 0, 159), (93, 0, 0, 0, 155), (94, 0, 1229, 0, 159), (95, 0, 0, 0, 155), (96, 0, 1206, 0, 160), (97, 0, 0, 0, 160), (98, 0, 1025, 0, 158), (99, 0, 0, 0, 156), (100, 0, 1030, 0, 159), (101, 0, 0, 0, 155), (102, 0, 1016, 0, 159), (103, 0, 0, 0, 135), (104, 0, 535, 0, 159), (105, 0, 0, 0, 156), (106, 0, 758, 0, 159), (107, 0, 0, 0, 156), (108, 0, 1030, 0, 159), (109, 0, 0, 0, 155), (110, 0, 1004, 0, 158), (111, 0, 0, 0, 155), (112, 0, 2584, 0, 159), (113, 0, 0, 0, 157), (114, 0, 2684, 0, 159), (115, 0, 0, 0, 311), (116, 0, 1671, 0, 159), (117, 0, 0, 0, 311), (118, 0, 2576, 0, 159), (119, 0, 0, 0, 310), (120, 0, 2553, 0, 159), (121, 0, 0, 0, 311), (122, 0, 2567, 0, 159), (123, 0, 0, 0, 312), (124, 0, 1730, 0, 159), (125, 0, 0, 0, 176), (126, 0, 2518, 0, 159), (127, 0, 0, 0, 321), (128, 1, 2520, 0, 159), (129, 0, 0, 0, 312), (130, 0, 2585, 0, 159), (131, 0, 0, 0, 312), (132, 0, 2549, 0, 159), (133, 0, 0, 0, 312), (134, 0, 2575, 0, 159), (135, 0, 0, 0, 311), (136, 0, 2653, 0, 159), (137, 0, 0, 0, 312), (138, 0, 2553, 0, 159), (139, 0, 0, 0, 311), (140, 0, 2557, 0, 155), (141, 0, 0, 0, 311), (142, 0, 2559, 0, 160), (143, 0, 0, 0, 312), (144, 0, 2503, 0, 143), (145, 0, 0, 0, 311), (146, 0, 2525, 0, 160), (147, 0, 0, 0, 312), (148, 0, 2515, 0, 164), (149, 0, 0, 0, 311), (150, 0, 2530, 0, 159), (151, 0, 0, 0, 311), (152, 0, 2520, 0, 167), (153, 0, 0, 0, 312), (154, 0, 2563, 0, 158), (155, 0, 0, 0, 311), (156, 0, 2500, 0, 147), (157, 0, 0, 0, 311), (158, 0, 2506, 0, 177), (159, 0, 0, 0, 311), (160, 0, 2503, 0, 158), (161, 0, 0, 0, 311), (162, 0, 2499, 0, 159), (163, 0, 0, 0, 312), (164, 0, 2521, 0, 159), (165, 0, 0, 0, 311), (166, 0, 4091, 0, 159), (167, 0, 0, 0, 310), (168, 0, 2488, 0, 158), (169, 0, 0, 0, 155), (170, 0, 5342, 0, 158), (171, 0, 0, 0, 156), (172, 0, 2858, 0, 158), (173, 0, 0, 0, 155), (174, 0, 3642, 0, 158), (175, 0, 0, 0, 155), (176, 0, 5451, 0, 124), (177, 0, 0, 0, 156), (178, 0, 2557, 0, 158), (179, 0, 0, 0, 279), (180, 0, 2390, 0, 159), (181, 0, 0, 0, 156), (182, 0, 2389, 0, 159), (183, 0, 0, 0, 156), (184, 0, 2374, 0, 158), (185, 0, 0, 0, 156), (186, 0, 2343, 0, 159), (187, 0, 0, 0, 155), (188, 0, 2348, 0, 158), (189, 0, 0, 0, 155), (190, 0, 2363, 0, 157), (191, 0, 0, 0, 155), (192, 0, 2375, 0, 159), (193, 0, 0, 0, 155), (194, 0, 2912, 0, 158), (195, 0, 0, 0, 156), (196, 0, 2395, 0, 159), (197, 0, 0, 0, 156), (198, 0, 2448, 0, 159), (199, 0, 0, 0, 156), (200, 0, 3491, 0, 158), (201, 0, 0, 0, 155), (202, 0, 2513, 0, 159), (203, 0, 0, 0, 156), (204, 0, 2837, 0, 158), (205, 0, 0, 0, 155), (206, 0, 4267, 0, 159), (207, 0, 0, 0, 156), (208, 0, 2344, 0, 159), (209, 0, 0, 0, 156), (210, 0, 2377, 0, 159), (211, 0, 0, 0, 156), (212, 0, 2088, 0, 163), (213, 0, 0, 0, 326), (214, 0, 1836, 0, 167), (215, 0, 0, 0, 312), (216, 0, 1919, 0, 158), (217, 0, 0, 0, 311), (218, 0, 2210, 0, 157), (219, 0, 0, 0, 316), (220, 0, 1553, 0, 159), (221, 0, 0, 0, 155), (222, 0, 891, 0, 157), (223, 0, 0, 0, 155), (224, 0, 777, 0, 157), (225, 0, 0, 0, 156), (226, 0, 2213, 0, 158), (227, 0, 0, 0, 157), (228, 0, 1963, 0, 158), (229, 0, 0, 0, 311), (230, 0, 519, 0, 158), (231, 0, 0, 0, 156), (232, 0, 120, 0, 155), (233, 0, 0, 0, 155), (234, 0, 124, 0, 156), (235, 0, 0, 0, 155), (236, 0, 130, 0, 156), (237, 0, 0, 0, 155), (238, 0, 125, 0, 155), (239, 0, 0, 0, 155), (240, 0, 130, 0, 155), (241, 0, 0, 0, 156), (242, 0, 123, 0, 156), (243, 0, 0, 0, 156), (244, 0, 109, 0, 156), (245, 0, 0, 0, 155), (246, 0, 123, 0, 156), (247, 0, 0, 0, 155), (248, 0, 152, 0, 156), (249, 0, 0, 0, 156), (250, 0, 134, 0, 156), (251, 0, 0, 0, 155), (252, 0, 139, 0, 156), (253, 0, 0, 0, 155), (254, 0, 130, 0, 155), (255, 0, 0, 0, 155), (256, 0, 130, 0, 147), (257, 0, 0, 0, 155), (258, 0, 126, 0, 155), (259, 0, 0, 0, 155), (260, 0, 132, 0, 156), (261, 0, 0, 0, 156), (262, 0, 129, 0, 155), (263, 0, 0, 0, 155), (264, 0, 132, 0, 155), (265, 0, 0, 0, 156), (266, 0, 141, 0, 156), (267, 0, 0, 0, 155), (268, 0, 128, 0, 155), (269, 0, 0, 0, 156), (270, 0, 101, 0, 157), (271, 0, 0, 0, 156), (272, 0, 99, 0, 156), (273, 0, 0, 0, 156), (274, 0, 71, 0, 156), (275, 0, 0, 0, 156), (276, 0, 64, 0, 156), (277, 0, 0, 0, 156), (278, 0, 108, 0, 156), (279, 0, 0, 0, 156), (280, 0, 83, 0, 157), (281, 0, 0, 0, 156), (282, 0, 126, 0, 156), (283, 0, 0, 0, 156), (284, 0, 91, 0, 156), (285, 0, 0, 0, 156), (286, 0, 49, 0, 156), (287, 0, 0, 0, 156), (288, 0, 43, 0, 156), (289, 0, 0, 0, 156), (290, 0, 44, 0, 122), (291, 0, 0, 0, 156), (292, 0, 42, 0, 156), (293, 0, 0, 0, 156), (294, 0, 43, 0, 156), (295, 0, 0, 0, 156), (296, 0, 41, 0, 156), (297, 0, 0, 0, 156), (298, 0, 50, 0, 156), (299, 0, 0, 0, 156), (300, 0, 43, 0, 156), (301, 0, 0, 0, 156), (302, 0, 54, 0, 161), (303, 0, 0, 0, 156), (304, 0, 43, 0, 156), (305, 0, 0, 0, 156), (306, 0, 41, 0, 156), (307, 0, 0, 0, 156), (308, 0, 42, 0, 156), (309, 0, 0, 0, 156), (310, 0, 42, 0, 156), (311, 0, 0, 0, 156), (312, 0, 40, 0, 156), (313, 0, 0, 0, 156), (314, 0, 50, 0, 155), (315, 0, 0, 0, 156), (316, 0, 40, 0, 156), (317, 0, 0, 0, 156), (318, 0, 40, 0, 128), (319, 0, 0, 0, 156), (320, 0, 41, 0, 156), (321, 0, 0, 0, 155), (322, 0, 54, 0, 155), (323, 0, 0, 0, 155), (324, 0, 54, 0, 155), (325, 0, 0, 0, 155), (326, 0, 53, 0, 155), (327, 0, 0, 0, 156), (328, 0, 9, 0, 155), (329, 0, 0, 0, 155), (330, 0, 33, 0, 172), (331, 0, 0, 0, 155), (332, 0, 22, 0, 155), (333, 0, 0, 0, 155), (334, 0, 13, 0, 156), (335, 0, 0, 0, 155), (336, 0, 79, 0, 156), (337, 0, 0, 0, 155), (338, 0, 16, 0, 155), (339, 0, 0, 0, 155), (340, 0, 8, 0, 155), (341, 0, 0, 0, 139)]
2026-09-11T21:33:03.368034Z  INFO invoking streaming host exchange call call="run" command=0 phases=13
2026-09-11T21:33:03.379047Z DEBUG host phases: (phase, ready, copy, acknowledge, wait) microseconds call="run" elapsed_us=10996 input_bytes=857304 output_bytes=994912 input_batches=3 output_batches=4 timings=[(0, 0, 405, 0, 161), (1, 0, 0, 0, 155), (2, 0, 98, 0, 155), (3, 0, 0, 0, 156), (4, 0, 34, 0, 155), (5, 0, 0, 0, 155), (6, 0, 0, 0, 8769), (7, 0, 0, 0, 156), (8, 0, 52, 0, 0), (9, 0, 0, 0, 156), (10, 0, 162, 0, 0), (11, 0, 0, 0, 158), (12, 0, 40, 0, 0)]
2026-09-11T21:33:03.379084Z DEBUG resident invocation including output collection inference=0 collect_us=1 elapsed_us=11670
profile=artifacts/fp8-attention-20260911/full27-pv/model.ipuprof tiles=1472 samples=243736
referenceMinimumCosineSimilarity=0.994595915
referenceInference=1 numericalTest=PASS
2026-09-11T21:33:04.501285Z  INFO invoking streaming host exchange call call="run" command=0 phases=13
2026-09-11T21:33:04.511843Z DEBUG host phases: (phase, ready, copy, acknowledge, wait) microseconds call="run" elapsed_us=10535 input_bytes=857304 output_bytes=994912 input_batches=3 output_batches=4 timings=[(0, 1, 57, 0, 0), (1, 0, 0, 0, 162), (2, 0, 39, 0, 157), (3, 0, 0, 0, 156), (4, 0, 11, 0, 156), (5, 0, 0, 0, 164), (6, 0, 0, 0, 8779), (7, 0, 0, 0, 162), (8, 0, 89, 0, 0), (9, 0, 0, 0, 158), (10, 0, 206, 0, 0), (11, 0, 0, 0, 158), (12, 0, 53, 0, 0)]
2026-09-11T21:33:04.511875Z DEBUG resident invocation including output collection inference=1 collect_us=4 elapsed_us=10721
referenceMinimumCosineSimilarity=0.994595915
referenceInference=2 numericalTest=PASS
2026-09-11T21:33:04.512114Z  INFO invoking streaming host exchange call call="run" command=0 phases=13
2026-09-11T21:33:04.522810Z DEBUG host phases: (phase, ready, copy, acknowledge, wait) microseconds call="run" elapsed_us=10686 input_bytes=857304 output_bytes=994912 input_batches=3 output_batches=4 timings=[(0, 0, 59, 0, 0), (1, 0, 0, 0, 159), (2, 0, 47, 0, 157), (3, 0, 0, 0, 157), (4, 0, 13, 0, 180), (5, 1, 0, 0, 166), (6, 0, 0, 0, 8779), (7, 0, 0, 0, 158), (8, 0, 68, 0, 0), (9, 0, 0, 0, 304), (10, 0, 199, 0, 0), (11, 0, 0, 0, 160), (12, 0, 52, 0, 0)]
2026-09-11T21:33:04.539407Z DEBUG resident invocation including output collection inference=2 collect_us=2 elapsed_us=27413
referenceMinimumCosineSimilarity=0.994595915
referenceInference=3 numericalTest=PASS
referenceMaximumAbsoluteError=0.478702 numericalTest=PASS
package=artifacts/fp8-attention-20260911/full27-pv/model.ipuexe tiles=1472 hardwareTest=PASS