XPK Start: Mon Apr 20 22:34:48 UTC 2026 2026-04-20 22:34:52.260184: E external/local_xla/xla/stream_executor/cuda/cuda_fft.cc:467] Unable to register cuFFT factory: Attempting to register factory for plugin cuFFT when one has already been registered WARNING: All log messages before absl::InitializeLog() is called are written to STDERR E0000 00:00:1776724492.272854 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776724492.276717 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776724492.287974 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776724492.287993 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776724492.287995 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776724492.287997 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-20 22:35:11.874469: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0420 22:35:12.386209 139938650335040 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-20 22:35:21,428:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0420 22:35:21.428266 139938650335040 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-20 22:35:21,430:jax._src.distributed:157: Connecting to JAX distributed service on mt-02-synthetic-13ten-slice-job-0-0.mt-02-synthetic-13ten:8482 I0420 22:35:21.430604 139938650335040 distributed.py:157] Connecting to JAX distributed service on mt-02-synthetic-13ten-slice-job-0-0.mt-02-synthetic-13ten:8482 I0420 22:35:24.788940 139938650335040 max_utils.py:284] Jax distributed system initialized! I0420 22:35:31.557241 139938650335040 max_utils.py:800] System Information: Jax Version: 0.8.1 I0420 22:35:31.557342 139938650335040 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0420 22:35:31.557381 139938650335040 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709 I0420 22:35:31.557428 139938650335040 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 22:35:32.177817 139938650335040 maxtext_utils.py:1517] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 22:35:32.178103 139938650335040 checkpointing.py:677] Setting up checkpoint logger... I0420 22:35:32.178158 139938650335040 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 22:35:32.178202 139938650335040 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0420 22:35:32.178570 139938650335040 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7f457836d160>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 22:35:35.077986 139938650335040 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0420 22:35:35.078328 139938650335040 checkpoint_manager.py:709] [process=1][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f443c43e3f0>}, handler_registry=None I0420 22:35:35.078607 139938650335040 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f443c43e3f0>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0420 22:35:35.078668 139938650335040 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f322741ac90>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0420 22:35:35.078714 139938650335040 composite_checkpoint_handler.py:505] Initialized registry DefaultCheckpointHandlerRegistry({('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f443c43e3f0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f443c43e3f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f322741ac90>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f322741ac90>}). I0420 22:35:35.079236 139938650335040 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0420 22:35:35.079314 139938650335040 async_checkpointer.py:177] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7f32250e6ac0> timeout: 600 secs and primary_host=0 for async checkpoint writes I0420 22:35:36.578134 139938650335040 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints I0420 22:35:37.434741 139938650335040 checkpoint_manager.py:929] [process=1][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f3227415730> I0420 22:35:37.434918 139938650335040 checkpointing.py:301] Checkpoint manager created! I0420 22:35:38.342070 139938650335040 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 22:35:38.342176 139938650335040 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 22:35:38.714802 139938650335040 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 22:35:38.714905 139938650335040 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 22:35:38.731148 139938650335040 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 22:35:38.731212 139938650335040 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 22:35:38.755035 139938650335040 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 22:35:38.755105 139938650335040 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 22:35:38.771667 139938650335040 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 22:35:38.771726 139938650335040 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 22:35:38.787940 139938650335040 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 22:35:38.788008 139938650335040 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 22:35:38.813320 139938650335040 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 22:35:38.813392 139938650335040 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 22:35:38.833576 139938650335040 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 22:35:38.833642 139938650335040 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 22:35:39.027417 139938650335040 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0420 22:35:39.027527 139938650335040 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 22:35:40.459391 139938650335040 maxtext_utils.py:1620] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0420 22:35:40.459545 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0420 22:35:40.459602 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0420 22:35:40.459660 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0420 22:35:40.459713 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0420 22:35:40.459752 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0420 22:35:40.459803 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/self_attention/key/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0420 22:35:40.459861 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/self_attention/out/kernel Shape: float32[16,16,128,2048] Logical: PartitionSpec('heads', 'layers', 'kv', 'embed') Physical: (None, None, None, 'fsdp') I0420 22:35:40.459903 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/self_attention/query/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'q_heads', 'kv') Physical: ('fsdp', None, None, None) I0420 22:35:40.459939 139938650335040 maxtext_utils.py:1620] params/params/decoder/layers/self_attention/value/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0420 22:35:40.459986 139938650335040 maxtext_utils.py:1620] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0420 22:35:40.460033 139938650335040 maxtext_utils.py:1620] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0420 22:35:40.976206 139938650335040 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0420 22:35:40.976308 139938650335040 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0420 22:35:40.991699 139938650335040 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0420 22:35:40.991761 139938650335040 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0420 22:35:51.429247 139938650335040 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0420 22:35:51.430067 139938650335040 metric_logger.py:289] number parameters: 1.104 billion I0420 22:36:02.474861 139938650335040 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0420 22:36:02.718741 139938650335040 checkpointing.py:776] Waited 0.24386119842529297 seconds for step 0 to finish before starting checkpointing. I0420 22:36:02.721313 139938650335040 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 22:36:02.722965 139938650335040 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 0 I0420 22:36:02.725761 139938650335040 async_checkpointer.py:452] [process=1] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints/0. I0420 22:36:03.696158 139938650335040 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 22:36:03.697139 139938650335040 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0420 22:36:03.697197 139938650335040 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0420 22:36:03.947273 139938650335040 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.251194s I0420 22:36:03.947448 139938650335040 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.048 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5061233043670654 s) (per-host) I0420 22:36:03.947502 139938650335040 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.506188s (batch_requests_ready=0.251376s, total_serialization_initiated=0.254740s, others=0.000072s) I0420 22:36:03.947594 139938650335040 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.510312s (all_items=0.000020s, per_item={'items': '0.00001955'}, temp_paths=0.510292) I0420 22:36:03.948544 139815873931008 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0420 22:36:03.948673 139938650335040 async_checkpointer.py:561] Finished blocking save. Time taken: 1.225638s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints/0. I0420 22:36:04.398507 139938650335040 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 22:36:04.398865 139811033700096 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0420 22:36:04.399030 139938650335040 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776724562.7212956, 'wait_for_prev_duration_secs': 6.270408630371094e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776724562.7230036, 'checkpointer_blocking_duration_secs': 1.2258472442626953, 'get_old_steps_start_time': 1776724563.9488711, 'get_old_steps_duration_secs': 2.6941299438476562e-05, 'checkpoint_manager_blocking_start_time': 1776724562.7192838, 'checkpoint_manager_blocking_duration_secs': 1.6797032356262207} I0420 22:36:04.399183 139938650335040 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0420 22:36:04.399235 139938650335040 max_utils.py:750] Memstats: After params initialized: I0420 22:36:04.399294 139938650335040 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0420 22:36:04.399328 139938650335040 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0420 22:36:04.399357 139938650335040 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0420 22:36:04.399382 139938650335040 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0420 22:36:04.666523 139938650335040 metric_logger.py:185] completed step: 0, seconds: 11.045, TFLOP/s/device: 1.230, Tokens/s/device: 185.429, total_weights: 65536, loss: 10.874 I0420 22:36:04.844788 139938650335040 metric_logger.py:185] completed step: 1, seconds: 2.190, TFLOP/s/device: 6.203, Tokens/s/device: 935.014, total_weights: 65536, loss: 10.874 I0420 22:36:05.667103 139938650335040 metric_logger.py:185] completed step: 2, seconds: 0.031, TFLOP/s/device: 437.335, Tokens/s/device: 65919.918, total_weights: 65536, loss: 10.263 I0420 22:36:05.814949 139938650335040 metric_logger.py:185] completed step: 3, seconds: 0.823, TFLOP/s/device: 16.517, Tokens/s/device: 2489.549, total_weights: 65536, loss: 9.734 I0420 22:36:06.110148 139938650335040 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 89.012, Tokens/s/device: 13416.927, total_weights: 65536, loss: 9.278 I0420 22:36:06.115935 139938650335040 metric_logger.py:185] completed step: 5, seconds: 0.148, TFLOP/s/device: 91.845, Tokens/s/device: 13843.824, total_weights: 65536, loss: 8.892 I0420 22:36:25.401078 139938650335040 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.955, Tokens/s/device: 6926.805, total_weights: 65536, loss: 8.592 I0420 22:36:25.548468 139938650335040 metric_logger.py:185] completed step: 7, seconds: 19.138, TFLOP/s/device: 0.710, Tokens/s/device: 107.010, total_weights: 65536, loss: 8.384 I0420 22:36:25.695980 139938650335040 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.228, Tokens/s/device: 13449.440, total_weights: 65536, loss: 8.255 I0420 22:36:25.843025 139938650335040 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0420 22:36:25.843681 139938650335040 checkpointing.py:776] Waited 0.0006766319274902344 seconds for step 9 to finish before starting checkpointing. I0420 22:36:25.845733 139938650335040 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 22:36:26.557368 2674 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 22:36:29.212922 139815882323712 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints/0/items/array_metadatas/process_1 I0420 22:36:59.745999 139815873931008 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 28.054 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 56.30464839935303 s) (per-host) I0420 22:36:59.746099 139815873931008 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 55.797348s. I0420 22:37:08.711723 139815873931008 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 64.762955s. I0420 22:37:08.712050 139811033700096 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 22:37:08.712195 139811033700096 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0420 22:37:08.712248 139811033700096 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 22:37:08.713994 139811033700096 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 22:37:08.714172 139938650335040 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0420 22:37:08.714309 139938650335040 checkpoint_manager.py:1458] Waiting for previous save to complete took 42.868582 seconds. If this number is high, consider checkpointing less frequently. I0420 22:37:08.716165 139938650335040 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 9 I0420 22:37:08.719667 139938650335040 async_checkpointer.py:452] [process=1] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints/9. I0420 22:37:09.683468 139938650335040 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0420 22:37:09.683567 139938650335040 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0420 22:37:09.727534 139938650335040 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.045359s I0420 22:37:09.727705 139938650335040 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.994 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3088843822479248 s) (per-host) I0420 22:37:09.727758 139938650335040 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.308949s (batch_requests_ready=0.261680s, total_serialization_initiated=0.047195s, others=0.000074s) I0420 22:37:09.727844 139938650335040 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.314181s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.314165) I0420 22:37:09.728789 139811562178304 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0420 22:37:09.728919 139938650335040 async_checkpointer.py:561] Finished blocking save. Time taken: 1.012682s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints/9. I0420 22:37:10.186038 139938650335040 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 22:37:10.186427 139811033700096 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0420 22:37:10.186600 139938650335040 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776724585.8457036, 'wait_for_prev_duration_secs': 42.86858248710632, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776724628.7162032, 'checkpointer_blocking_duration_secs': 1.0128991603851318, 'get_old_steps_start_time': 1776724629.7291222, 'get_old_steps_duration_secs': 2.8848648071289062e-05, 'checkpoint_manager_blocking_start_time': 1776724585.8439052, 'checkpoint_manager_blocking_duration_secs': 44.34265851974487} I0420 22:37:10.186710 139938650335040 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0420 22:37:10.186755 139938650335040 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 22:37:16.046202 139815882323712 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221/linen_xpk_feat_Migrate_Decoder_And_Tests_to_NNX_20260420_223221_02_synthetic/checkpoints/9/items/array_metadatas/process_1 I0420 22:37:51.181443 139811562178304 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 37.823 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.7625629901886 s) (per-host) I0420 22:37:51.181564 139811562178304 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.452561s. I0420 22:38:02.221246 139811562178304 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 52.492225s. I0420 22:38:02.221562 139811033700096 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 22:38:02.221678 139811033700096 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0420 22:38:02.221726 139811033700096 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 22:38:02.224186 139811033700096 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 22:38:02.224364 139938650335040 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 22:38:02.224515 139938650335040 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 22:38:02.225180 139938650335040 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.204, Tokens/s/device: 13898.031, total_weights: 65536, loss: 8.179 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Mon Apr 20 22:38:13 UTC 2026 EXIT_CODE=0