XPK Start: Tue Apr 21 01:53:26 UTC 2026 2026-04-21 01:53:30.704453: 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 00:00:1776736410.717161 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776736410.720873 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776736410.732161 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776736410.732178 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776736410.732180 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776736410.732182 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-21 01:53:49.795250: 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) I0421 01:53:50.315515 138293463746368 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-21 01:53:59,357:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0421 01:53:59.357281 138293463746368 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-21 01:53:59,359:jax._src.distributed:157: Connecting to JAX distributed service on mt-15-ocdbt-true-sv-ew2rm-slice-job-0-0.mt-15-ocdbt-true-sv-ew2rm:8482 I0421 01:53:59.359772 138293463746368 distributed.py:157] Connecting to JAX distributed service on mt-15-ocdbt-true-sv-ew2rm-slice-job-0-0.mt-15-ocdbt-true-sv-ew2rm:8482 I0421 01:54:00.790592 138293463746368 max_utils.py:284] Jax distributed system initialized! I0421 01:54:06.589093 138293463746368 max_utils.py:800] System Information: Jax Version: 0.8.1 I0421 01:54:06.589204 138293463746368 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0421 01:54:06.589246 138293463746368 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 I0421 01:54:06.589279 138293463746368 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 01:54:07.209679 138293463746368 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 01:54:07.209978 138293463746368 checkpointing.py:677] Setting up checkpoint logger... I0421 01:54:07.210036 138293463746368 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 01:54:07.210081 138293463746368 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0421 01:54:07.210462 138293463746368 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 0x7dc66df74fe0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 01:54:10.869566 138293463746368 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0421 01:54:10.869811 138293463746368 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 0x7db46ee97d40>}, handler_registry=None I0421 01:54:10.870045 138293463746368 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7db46ee97d40>` 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`. I0421 01:54:10.870098 138293463746368 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7db46ee9bce0>` 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`. I0421 01:54:10.870134 138293463746368 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 0x7db46ee97d40>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7db46ee97d40>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7db46ee9bce0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7db46ee9bce0>}). I0421 01:54:10.872806 138293463746368 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0421 01:54:10.872889 138293463746368 async_checkpointer.py:177] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7dc6543fb2e0> timeout: 600 secs and primary_host=0 for async checkpoint writes I0421 01:54:11.987227 138293463746368 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints I0421 01:54:12.472015 138293463746368 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=5), 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_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7db46ee9bdd0> I0421 01:54:12.472203 138293463746368 checkpointing.py:301] Checkpoint manager created! I0421 01:54:13.356527 138293463746368 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 01:54:13.356632 138293463746368 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:54:13.725012 138293463746368 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 01:54:13.725111 138293463746368 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:54:13.740769 138293463746368 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 01:54:13.740829 138293463746368 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:54:13.764076 138293463746368 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:54:13.764150 138293463746368 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:54:13.779956 138293463746368 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:54:13.780018 138293463746368 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:54:13.795814 138293463746368 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:54:13.795874 138293463746368 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:54:13.819816 138293463746368 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 01:54:13.819901 138293463746368 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:54:13.839377 138293463746368 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 01:54:13.839452 138293463746368 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 01:54:14.028310 138293463746368 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0421 01:54:14.028430 138293463746368 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 01:54:15.444854 138293463746368 maxtext_utils.py:1501] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0421 01:54:15.444986 138293463746368 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 01:54:15.445041 138293463746368 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 01:54:15.445101 138293463746368 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0421 01:54:15.445153 138293463746368 maxtext_utils.py:1501] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0421 01:54:15.445194 138293463746368 maxtext_utils.py:1501] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0421 01:54:15.445246 138293463746368 maxtext_utils.py:1501] 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) I0421 01:54:15.445297 138293463746368 maxtext_utils.py:1501] 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') I0421 01:54:15.445336 138293463746368 maxtext_utils.py:1501] 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) I0421 01:54:15.445371 138293463746368 maxtext_utils.py:1501] 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) I0421 01:54:15.445432 138293463746368 maxtext_utils.py:1501] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0421 01:54:15.445482 138293463746368 maxtext_utils.py:1501] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0421 01:54:15.947529 138293463746368 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 01:54:15.947626 138293463746368 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0421 01:54:15.962388 138293463746368 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 01:54:15.962463 138293463746368 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0421 01:54:26.682219 138293463746368 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. I0421 01:54:26.683108 138293463746368 metric_logger.py:289] number parameters: 1.104 billion I0421 01:54:37.566020 138293463746368 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0421 01:54:38.040543 138293463746368 checkpointing.py:776] Waited 0.474506139755249 seconds for step 0 to finish before starting checkpointing. I0421 01:54:38.042996 138293463746368 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:54:38.044659 138293463746368 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 0 I0421 01:54:38.047514 138293463746368 async_checkpointer.py:452] [process=1] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/0. I0421 01:54:39.055514 138293463746368 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 01:54:39.056456 138293463746368 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:54:39.056514 138293463746368 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 I0421 01:54:39.299499 138293463746368 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.244066s I0421 01:54:39.299664 138293463746368 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.059 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5042135715484619 s) (per-host) I0421 01:54:39.299713 138293463746368 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.504272s (batch_requests_ready=0.256583s, total_serialization_initiated=0.247622s, others=0.000066s) I0421 01:54:39.299801 138293463746368 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.508554s (all_items=0.000020s, per_item={'items': '0.00001955'}, temp_paths=0.508534) I0421 01:54:39.300707 138172830828288 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0421 01:54:39.300875 138293463746368 async_checkpointer.py:561] Finished blocking save. Time taken: 1.256148s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/0. I0421 01:54:39.749988 138293463746368 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 01:54:39.750376 138169525708544 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0421 01:54:39.750554 138293463746368 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776736478.0429783, 'wait_for_prev_duration_secs': 6.341934204101562e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776736478.0446975, 'checkpointer_blocking_duration_secs': 1.2562782764434814, 'get_old_steps_start_time': 1776736479.3009963, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776736478.04112, 'checkpoint_manager_blocking_duration_secs': 1.7093915939331055} I0421 01:54:39.750662 138293463746368 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0421 01:54:39.750715 138293463746368 max_utils.py:750] Memstats: After params initialized: I0421 01:54:39.750771 138293463746368 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0421 01:54:39.750806 138293463746368 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0421 01:54:39.750834 138293463746368 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0421 01:54:39.750859 138293463746368 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0421 01:54:40.015197 138293463746368 metric_logger.py:185] completed step: 0, seconds: 10.883, TFLOP/s/device: 1.248, Tokens/s/device: 188.187, total_weights: 65536, loss: 10.874 I0421 01:54:40.189779 138293463746368 metric_logger.py:185] completed step: 1, seconds: 2.448, TFLOP/s/device: 5.551, Tokens/s/device: 836.643, total_weights: 65536, loss: 10.874 I0421 01:54:40.564893 138293463746368 metric_logger.py:185] completed step: 2, seconds: 0.027, TFLOP/s/device: 498.482, Tokens/s/device: 75136.662, total_weights: 65536, loss: 10.560 I0421 01:54:40.712358 138293463746368 metric_logger.py:185] completed step: 3, seconds: 0.376, TFLOP/s/device: 36.168, Tokens/s/device: 5451.593, total_weights: 65536, loss: 9.980 I0421 01:54:40.716828 138293463746368 checkpointing.py:772] Waiting for step 5 to finish before checkpoint... I0421 01:54:41.007159 138293463746368 checkpointing.py:776] Waited 0.2902998924255371 seconds for step 5 to finish before starting checkpointing. I0421 01:54:41.010005 138293463746368 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 01:54:45.986218 2549 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 01:54:49.154915 138172839220992 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/0/items/array_metadatas/process_1 I0421 01:55:19.525155 138172830828288 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 38.782 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.729655742645264 s) (per-host) I0421 01:55:19.525270 138172830828288 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.224452s. I0421 01:55:29.582442 138172830828288 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 50.281607s. I0421 01:55:29.582727 138169525708544 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 01:55:29.582845 138169525708544 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0421 01:55:29.582894 138169525708544 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:55:29.585823 138169525708544 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 01:55:29.586009 138293463746368 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. W0421 01:55:29.586134 138293463746368 checkpoint_manager.py:1458] Waiting for previous save to complete took 48.576131 seconds. If this number is high, consider checkpointing less frequently. I0421 01:55:29.588237 138293463746368 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 5 I0421 01:55:29.592363 138293463746368 async_checkpointer.py:452] [process=1] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/5. I0421 01:55:30.965107 138293463746368 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:55:30.965210 138293463746368 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 I0421 01:55:31.005047 138293463746368 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.041104s I0421 01:55:31.005210 138293463746368 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.317 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29010701179504395 s) (per-host) I0421 01:55:31.005261 138293463746368 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.290167s (batch_requests_ready=0.247176s, total_serialization_initiated=0.042924s, others=0.000067s) I0421 01:55:31.005346 138293463746368 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.295236s (all_items=0.000016s, per_item={'items': '0.00001574'}, temp_paths=0.295221) I0421 01:55:31.006189 138166836750080 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0421 01:55:31.006312 138293463746368 async_checkpointer.py:561] Finished blocking save. Time taken: 1.418008s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/5. I0421 01:55:31.451194 138293463746368 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0421 01:55:31.451579 138169525708544 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0421 01:55:31.451728 138293463746368 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776736481.0099788, 'wait_for_prev_duration_secs': 48.576130628585815, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776736529.5882761, 'checkpointer_blocking_duration_secs': 1.4182090759277344, 'get_old_steps_start_time': 1776736531.0065038, 'get_old_steps_duration_secs': 2.765655517578125e-05, 'checkpoint_manager_blocking_start_time': 1776736481.0077825, 'checkpoint_manager_blocking_duration_secs': 50.44390940666199} I0421 01:55:31.451907 138293463746368 checkpointing.py:408] Started an asynchronous checkpoint save for step 5 I0421 01:55:31.452540 138293463746368 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 89.094, Tokens/s/device: 13429.156, total_weights: 65536, loss: 9.460 I0421 01:55:31.458174 138293463746368 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.183, Tokens/s/device: 13894.825, total_weights: 65536, loss: 8.959 I0421 01:55:52.784470 138293463746368 metric_logger.py:185] completed step: 6, seconds: 50.740, TFLOP/s/device: 0.268, Tokens/s/device: 40.362, total_weights: 65536, loss: 8.469 I0421 01:55:52.931924 138293463746368 metric_logger.py:185] completed step: 7, seconds: 21.180, TFLOP/s/device: 0.642, Tokens/s/device: 96.695, total_weights: 65536, loss: 8.003 I0421 01:55:53.079352 138293463746368 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.291, Tokens/s/device: 13458.986, total_weights: 65536, loss: 7.572 I0421 01:55:53.226673 138293463746368 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0421 01:55:53.227284 138293463746368 checkpointing.py:776] Waited 0.0006320476531982422 seconds for step 9 to finish before starting checkpointing. I0421 01:55:53.229377 138293463746368 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 01:55:59.174887 138172839220992 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/5/items/array_metadatas/process_1 I0421 01:56:34.314941 138166836750080 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 24.837 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 63.59978795051575 s) (per-host) I0421 01:56:34.315060 138166836750080 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 63.308673s. I0421 01:56:44.460165 138166836750080 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 73.453762s. I0421 01:56:44.460503 138169525708544 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 01:56:44.460629 138169525708544 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0421 01:56:44.460679 138169525708544 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:56:44.462246 138169525708544 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0421 01:56:44.462460 138293463746368 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5. W0421 01:56:44.462597 138293463746368 checkpoint_manager.py:1458] Waiting for previous save to complete took 51.233230 seconds. If this number is high, consider checkpointing less frequently. I0421 01:56:44.464245 138293463746368 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 9 I0421 01:56:44.467742 138293463746368 async_checkpointer.py:452] [process=1] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/9. I0421 01:56:45.402169 138293463746368 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:56:45.402268 138293463746368 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 I0421 01:56:45.443747 138293463746368 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042464s I0421 01:56:45.443917 138293463746368 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.351 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2882661819458008 s) (per-host) I0421 01:56:45.443967 138293463746368 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.288328s (batch_requests_ready=0.243822s, total_serialization_initiated=0.044439s, others=0.000067s) I0421 01:56:45.444055 138293463746368 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.292452s (all_items=0.000012s, per_item={'items': '0.00001168'}, temp_paths=0.292440) I0421 01:56:45.444893 138170337203968 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0421 01:56:45.445053 138293463746368 async_checkpointer.py:561] Finished blocking save. Time taken: 0.980737s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/9. I0421 01:56:45.874259 138293463746368 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 01:56:45.874665 138169525708544 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0421 01:56:45.874814 138293463746368 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776736553.2293494, 'wait_for_prev_duration_secs': 51.23323035240173, 'time_between_consecutive_saves_sec': 23.64347767829895, 'checkpointer_blocking_start_time': 1776736604.4642844, 'checkpointer_blocking_duration_secs': 0.98087477684021, 'get_old_steps_start_time': 1776736605.4451723, 'get_old_steps_duration_secs': 2.4318695068359375e-05, 'checkpoint_manager_blocking_start_time': 1776736553.2275312, 'checkpoint_manager_blocking_duration_secs': 52.6472487449646} I0421 01:56:45.874979 138293463746368 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0421 01:56:45.875022 138293463746368 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 01:56:51.521051 138172839220992 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_true/checkpoints/9/items/array_metadatas/process_1 I0421 01:57:27.421836 138170337203968 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 37.373 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.26614713668823 s) (per-host) I0421 01:57:27.421958 138170337203968 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.976954s. I0421 01:57:35.517319 138170337203968 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 50.072300s. I0421 01:57:35.517630 138169525708544 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 01:57:35.517751 138169525708544 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0421 01:57:35.517791 138169525708544 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:57:35.519261 138169525708544 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 01:57:35.519455 138293463746368 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. I0421 01:57:35.519605 138293463746368 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:57:35.520219 138293463746368 metric_logger.py:185] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.111, Tokens/s/device: 13883.993, total_weights: 65536, loss: 7.181 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 01:57:47 UTC 2026 EXIT_CODE=0