2026-09-06T21:44:21.325865Z  INFO retained operator-plan finalist finalist=0 values=31 operations=2 estimated_cycles=3745899 estimated_exchange_cycles=1101040 exchange_row_bytes=80812 peak_standard_bytes=412076 peak_interleaved_bytes=58240 peak_total_bytes=418220 maximum_standard_allocation_bytes=122880 active_tile_counts={1472} padding_group_counts={} conversion_sources=[]
2026-09-06T21:44:21.328945Z  INFO retained operator-plan finalist finalist=1 values=31 operations=2 estimated_cycles=3881939 estimated_exchange_cycles=1176920 exchange_row_bytes=88052 peak_standard_bytes=437236 peak_interleaved_bytes=58240 peak_total_bytes=443380 maximum_standard_allocation_bytes=122880 active_tile_counts={192} padding_group_counts={} conversion_sources=[]
2026-09-06T21:44:21.331949Z  INFO retained operator-plan finalist finalist=2 values=31 operations=2 estimated_cycles=3918759 estimated_exchange_cycles=1176920 exchange_row_bytes=88052 peak_standard_bytes=437236 peak_interleaved_bytes=58240 peak_total_bytes=443380 maximum_standard_allocation_bytes=122880 active_tile_counts={192} padding_group_counts={} conversion_sources=[]
2026-09-06T21:44:28.987448Z  INFO retained operator-plan finalist finalist=0 values=31 operations=2 estimated_cycles=3118791 estimated_exchange_cycles=987760 exchange_row_bytes=72316 peak_standard_bytes=406652 peak_interleaved_bytes=60672 peak_total_bytes=437372 maximum_standard_allocation_bytes=122880 active_tile_counts={1472} padding_group_counts={} conversion_sources=[]
2026-09-06T21:44:28.989757Z  INFO retained operator-plan finalist finalist=1 values=31 operations=2 estimated_cycles=3254831 estimated_exchange_cycles=1063640 exchange_row_bytes=79556 peak_standard_bytes=431812 peak_interleaved_bytes=60672 peak_total_bytes=462532 maximum_standard_allocation_bytes=122880 active_tile_counts={192} padding_group_counts={} conversion_sources=[]
2026-09-06T21:44:28.992013Z  INFO retained operator-plan finalist finalist=2 values=31 operations=2 estimated_cycles=3291651 estimated_exchange_cycles=1063640 exchange_row_bytes=79556 peak_standard_bytes=431812 peak_interleaved_bytes=60672 peak_total_bytes=462532 maximum_standard_allocation_bytes=122880 active_tile_counts={192} padding_group_counts={} conversion_sources=[]
2026-09-06T21:44:29.067632Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_mid"}: package build phase finished phase="lower_mid" elapsed_ms=17490 success=true
2026-09-06T21:45:10.492359Z  INFO screened tile mappings by exchange resource load candidates=125 baseline_cycles=388536 candidate_cycles=388536 baseline_pressure=311511 candidate_pressure=311511
2026-09-06T21:45:10.666433Z  INFO modelled expanded operator plan finalist=3 modelled_cycles=2513174 estimated_cycles=3479446 estimated_exchange_cycles=1378808
2026-09-06T21:45:21.147397Z  INFO screened tile mappings by exchange resource load candidates=137 baseline_cycles=413880 candidate_cycles=413880 baseline_pressure=326929 candidate_pressure=326929
2026-09-06T21:45:21.396240Z  INFO modelled expanded operator plan finalist=4 modelled_cycles=2683066 estimated_cycles=4141874 estimated_exchange_cycles=1898488
2026-09-06T21:45:32.463246Z  INFO screened tile mappings by exchange resource load candidates=191 baseline_cycles=459192 candidate_cycles=459192 baseline_pressure=351736 candidate_pressure=351736
2026-09-06T21:45:32.488150Z  INFO screened tile mappings by exchange resource load candidates=179 baseline_cycles=433848 candidate_cycles=433848 baseline_pressure=336318 candidate_pressure=336318
2026-09-06T21:45:32.673218Z  INFO modelled expanded operator plan finalist=0 modelled_cycles=3029702 estimated_cycles=3934126 estimated_exchange_cycles=1362272
2026-09-06T21:45:32.749410Z  INFO modelled expanded operator plan finalist=1 modelled_cycles=3199594 estimated_cycles=4596554 estimated_exchange_cycles=1881952
2026-09-06T21:45:32.750096Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: rejected infeasible operator-plan finalist finalist=2 error=tile scheduling failed: operator plan is incompatible with its values or block dimensions
2026-09-06T21:45:32.750253Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: rejected infeasible operator-plan finalist finalist=5 error=tile scheduling failed: operator plan is incompatible with its values or block dimensions
2026-09-06T21:45:33.179650Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=0 transfers=11656 maximum_identical_destinations=1
2026-09-06T21:45:33.179684Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=0 initial_horizon=2103 selected_horizon=2103 endpoint_lower_bound=1152 lower_bound_gap=951 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:45:33.191026Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=0 tile=623 row_words=82 horizon=2103
2026-09-06T21:45:53.492259Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=1 transfers=104904 maximum_identical_destinations=1
2026-09-06T21:45:53.492318Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=1 initial_horizon=6148 selected_horizon=6148 endpoint_lower_bound=1152 lower_bound_gap=4996 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:45:53.557193Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=1 tile=485 row_words=426 horizon=6148
2026-09-06T21:45:55.803670Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: compared ordinary and paired exchange schedules phase=2 candidates=2766 ordinary_horizon=11460 paired_horizon=10837 use_paired=true
2026-09-06T21:45:55.880743Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=2 transfers=2916 maximum_identical_destinations=1
2026-09-06T21:45:55.880778Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=2 initial_horizon=10837 selected_horizon=10837 endpoint_lower_bound=10368 lower_bound_gap=469 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:45:55.926304Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=2 tile=478 row_words=288 horizon=10837
2026-09-06T21:45:55.980772Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=4 transfers=1404 maximum_identical_destinations=1
2026-09-06T21:45:55.980794Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=4 initial_horizon=4865 selected_horizon=4865 endpoint_lower_bound=4736 lower_bound_gap=129 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:45:55.981781Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=4 tile=359 row_words=13 horizon=4865
2026-09-06T21:45:58.141339Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: compared ordinary and paired exchange schedules phase=5 candidates=2766 ordinary_horizon=11460 paired_horizon=10837 use_paired=true
2026-09-06T21:45:58.219807Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=5 transfers=2916 maximum_identical_destinations=1
2026-09-06T21:45:58.219843Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=5 initial_horizon=10837 selected_horizon=10837 endpoint_lower_bound=10368 lower_bound_gap=469 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:45:58.263186Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=5 tile=478 row_words=288 horizon=10837
2026-09-06T21:45:58.313472Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=7 transfers=1404 maximum_identical_destinations=1
2026-09-06T21:45:58.313492Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=7 initial_horizon=4865 selected_horizon=4865 endpoint_lower_bound=4736 lower_bound_gap=129 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:45:58.314484Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=7 tile=359 row_words=13 horizon=4865
2026-09-06T21:46:00.525127Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: compared ordinary and paired exchange schedules phase=8 candidates=2766 ordinary_horizon=12038 paired_horizon=11100 use_paired=true
2026-09-06T21:46:00.598159Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=8 transfers=2916 maximum_identical_destinations=1
2026-09-06T21:46:00.598182Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=8 initial_horizon=11100 selected_horizon=11100 endpoint_lower_bound=10368 lower_bound_gap=732 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:46:00.640562Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=8 tile=670 row_words=281 horizon=11100
2026-09-06T21:46:00.690791Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=10 transfers=1404 maximum_identical_destinations=1
2026-09-06T21:46:00.690811Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=10 initial_horizon=4865 selected_horizon=4865 endpoint_lower_bound=4736 lower_bound_gap=129 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:46:00.691842Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=10 tile=359 row_words=13 horizon=4865
2026-09-06T21:48:20.898483Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=11 transfers=182216 maximum_identical_destinations=1
2026-09-06T21:48:20.898526Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=11 initial_horizon=13385 selected_horizon=13385 endpoint_lower_bound=6632 lower_bound_gap=6753 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:48:21.131976Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=11 tile=47 row_words=6035 horizon=13385
2026-09-06T21:48:23.204423Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: prepared large physical exchange phase phase=12 transfers=3840 maximum_identical_destinations=1
2026-09-06T21:48:23.204457Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: optimized physical exchange schedule phase=12 initial_horizon=31310 selected_horizon=31310 endpoint_lower_bound=30720 lower_bound_gap=590 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:48:23.246162Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: finished large physical exchange phase phase=12 tile=91 row_words=370 horizon=31310
2026-09-06T21:48:23.414714Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: scheduled operator-plan finalist finalist=3 mapped=false analytical_cycles=3479446 analytical_exchange_cycles=1378808 scheduled_exchange_cycles=455952 refined_cycles=2556590
2026-09-06T21:48:23.620363Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: selected physically scheduled operator-plan finalist selected=3 mapped=false
2026-09-06T21:48:23.620389Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="select_finalist"}: package build phase finished phase="select_finalist" elapsed_ms=234552 success=true
2026-09-06T21:48:23.620409Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}: lowered graph for package construction logical_shards=53021 exchange_phases=14
2026-09-06T21:48:23.622076Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="compile_runtime"}: package build phase finished phase="compile_runtime" elapsed_ms=1 success=true
2026-09-06T21:48:23.624842Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=2 success=true
2026-09-06T21:48:23.625922Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=1 success=true
2026-09-06T21:48:23.626883Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-06T21:48:23.799430Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=30 success=true
2026-09-06T21:48:23.799481Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}: allocated package support memory linked_end=324564 profile_bytes=60 exchange_table_bytes=29456 host_code_bytes=1384 generated_code_bytes=3660 code_address=425984 standard_ranges=[(442368, 524288)]
2026-09-06T21:48:26.434886Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=2635 success=true
2026-09-06T21:48:26.565524Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-06T21:48:26.568061Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=11656 maximum_identical_destinations=1
2026-09-06T21:48:26.568069Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=2103 selected_horizon=2103 endpoint_lower_bound=1152 lower_bound_gap=951 selected_kind="reused" neighborhood_improvements=0
2026-09-06T21:48:26.573794Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=623 row_words=82 horizon=2103
2026-09-06T21:48:30.877657Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-06T21:48:30.905344Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=104904 maximum_identical_destinations=1
2026-09-06T21:48:30.905361Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=6148 selected_horizon=6148 endpoint_lower_bound=1152 lower_bound_gap=4996 selected_kind="reused" neighborhood_improvements=0
2026-09-06T21:48:30.943084Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=485 row_words=426 horizon=6148
2026-09-06T21:48:33.647413Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=2 candidates=2766 ordinary_horizon=11741 paired_horizon=10734 use_paired=true
2026-09-06T21:48:33.689896Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=2916 maximum_identical_destinations=1
2026-09-06T21:48:33.689913Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=10962 selected_horizon=10734 endpoint_lower_bound=10368 lower_bound_gap=366 selected_kind="critical-neighborhood" neighborhood_improvements=2
2026-09-06T21:48:33.710886Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=106 row_words=247 horizon=10734
2026-09-06T21:48:33.723772Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-06T21:48:33.744980Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=1404 maximum_identical_destinations=1
2026-09-06T21:48:33.744989Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=4865 selected_horizon=4865 endpoint_lower_bound=4736 lower_bound_gap=129 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:48:33.745666Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=359 row_words=13 horizon=4865
2026-09-06T21:48:36.343665Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=5 candidates=2766 ordinary_horizon=11741 paired_horizon=10734 use_paired=true
2026-09-06T21:48:36.386997Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2916 maximum_identical_destinations=1
2026-09-06T21:48:36.387013Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=10962 selected_horizon=10734 endpoint_lower_bound=10368 lower_bound_gap=366 selected_kind="critical-neighborhood" neighborhood_improvements=2
2026-09-06T21:48:36.408687Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=106 row_words=247 horizon=10734
2026-09-06T21:48:36.421806Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-06T21:48:36.442968Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=7 transfers=1404 maximum_identical_destinations=1
2026-09-06T21:48:36.442978Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=7 initial_horizon=4865 selected_horizon=4865 endpoint_lower_bound=4736 lower_bound_gap=129 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:48:36.443652Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=7 tile=359 row_words=13 horizon=4865
2026-09-06T21:48:38.250070Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=2766 ordinary_horizon=12335 paired_horizon=10884 use_paired=true
2026-09-06T21:48:38.298954Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=2916 maximum_identical_destinations=1
2026-09-06T21:48:38.298971Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=10884 selected_horizon=10884 endpoint_lower_bound=10368 lower_bound_gap=516 selected_kind="full-duplex" neighborhood_improvements=0
2026-09-06T21:48:38.324845Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=212 row_words=291 horizon=10884
2026-09-06T21:48:38.338055Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-06T21:48:38.345399Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-06T21:48:38.345837Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=1404 maximum_identical_destinations=1
2026-09-06T21:48:38.345842Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=4865 selected_horizon=4865 endpoint_lower_bound=4736 lower_bound_gap=129 selected_kind="reused" neighborhood_improvements=0
2026-09-06T21:48:38.346547Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=359 row_words=13 horizon=4865
2026-09-06T21:49:27.866964Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-06T21:49:27.930412Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=182216 maximum_identical_destinations=1
2026-09-06T21:49:27.930435Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=13385 selected_horizon=13385 endpoint_lower_bound=6632 lower_bound_gap=6753 selected_kind="reused" neighborhood_improvements=0
2026-09-06T21:49:28.158736Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=47 row_words=6035 horizon=13385
2026-09-06T21:49:28.389104Z  INFO ipu_codegen.package.build{tile_count=1472 operations=2}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=61954 success=false
Error: exchange lowering failed: exchange-schedule invariant failed: multicast loopback requires separate source and destination memory elements

Caused by:
    exchange-schedule invariant failed: multicast loopback requires separate source and destination memory elements