XPK Start: Tue Apr 21 10:20:28 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-21 10:20:52.226348: 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 10:20:52.405337 132255914547008 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 10:21:01.447907 132255914547008 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 10:21:01.450205 132255914547008 distributed.py:172] Connecting to JAX distributed service on mt-06-grad-accum-f4pfl-slice-job-0-0.mt-06-grad-accum-f4pfl:8482 I0421 10:21:02.322771 132255914547008 max_utils.py:284] Jax distributed system initialized! I0421 10:21:08.572407 132255914547008 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 10:21:08.572508 132255914547008 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 10:21:08.572548 132255914547008 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365 I0421 10:21:08.572589 132255914547008 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 10:21:09.266103 132255914547008 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 10:21:09.377752 132255914547008 checkpointing.py:688] Setting up checkpoint logger... I0421 10:21:09.377864 132255914547008 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 10:21:09.377908 132255914547008 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 10:21:09.378101 132255914547008 base_pytree_checkpoint_handler.py:441] 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 0x784883250380>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 10:21:12.170494 132255914547008 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 10:21:12.170824 132255914547008 checkpoint_manager.py:708] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7834700f8410>}, handler_registry=None I0421 10:21:12.171171 132255914547008 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7834700f8410>` 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 10:21:12.171223 132255914547008 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x783448216a80>` 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 10:21:12.171271 132255914547008 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 0x7834700f8410>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7834700f8410>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x783448216a80>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x783448216a80>}). I0421 10:21:12.171588 132255914547008 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 10:21:12.171685 132255914547008 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x783448345b20> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 10:21:13.395169 132255914547008 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints I0421 10:21:13.797194 132255914547008 checkpoint_manager.py:929] [process=4][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/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7834483e6600> I0421 10:21:13.797380 132255914547008 checkpointing.py:302] Checkpoint manager created! I0421 10:21:15.551016 132255914547008 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 10:21:15.551129 132255914547008 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 10:21:17.323491 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048]............................................... Unknown. I0421 10:21:17.323585 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048]............................................... (None,). I0421 10:21:17.338377 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,7168]....................................... Unknown. I0421 10:21:17.338433 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,7168]....................................... ('fsdp', None, None). I0421 10:21:17.367791 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[7168,16,2048]....................................... Unknown. I0421 10:21:17.367857 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[7168,16,2048]....................................... (None, None, 'fsdp'). I0421 10:21:17.382560 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16]............................................ Unknown. I0421 10:21:17.382614 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16]............................................ (None, None). I0421 10:21:17.411806 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,16,128]..................................... Unknown. I0421 10:21:17.411870 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,16,128]..................................... ('fsdp', None, None, None). I0421 10:21:17.426825 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[16,16,128,2048]..................................... Unknown. I0421 10:21:17.426883 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[16,16,128,2048]..................................... (None, None, None, 'fsdp'). I0421 10:21:17.477190 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,32000]......................................... Unknown. I0421 10:21:17.477288 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,32000]......................................... ('fsdp', None). I0421 10:21:17.491972 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[32000,2048]......................................... Unknown. I0421 10:21:17.492029 132255914547008 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[32000,2048]......................................... (None, 'fsdp'). I0421 10:21:17.712306 132255914547008 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 10:21:17.712454 132255914547008 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 10:21:17.718742 132255914547008 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 10:21:17.718848 132255914547008 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 10:21:17.735214 132255914547008 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 10:21:17.735363 132255914547008 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 10:21:17.751209 132255914547008 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 10:21:17.751347 132255914547008 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 10:21:17.786093 132255914547008 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 10:21:17.786276 132255914547008 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 10:21:17.802423 132255914547008 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 10:21:17.802558 132255914547008 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 10:21:17.818404 132255914547008 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 10:21:17.818548 132255914547008 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 10:21:17.846820 132255914547008 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 10:21:17.846969 132255914547008 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 10:21:17.869125 132255914547008 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 10:21:17.869216 132255914547008 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 10:21:29.114167 132255914547008 max_utils.py:791] Total memory size: 1.7 GB, Output size: 0.4 GB, Temp size: 1.3 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0421 10:21:29.116595 132255914547008 metric_logger.py:301] number parameters: 1.104 billion I0421 10:21:30.766095 132255914547008 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 10:21:41.996041 132255914547008 checkpointing.py:798] Waited 11.229929447174072 seconds for step 0 to finish before starting checkpointing. I0421 10:21:41.998744 132255914547008 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 10:21:42.000549 132255914547008 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 0 I0421 10:21:42.002294 132255914547008 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints/0. I0421 10:21:42.744001 132255914547008 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 10:21:42.745045 132255914547008 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 10:21:42.745103 132255914547008 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 10:21:43.020099 132255914547008 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.276870s I0421 10:21:43.020261 132255914547008 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 5.392 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28606247901916504 s) (per-host) I0421 10:21:43.020316 132255914547008 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.286127s (batch_requests_ready=0.003173s, total_serialization_initiated=0.282882s, others=0.000072s) I0421 10:21:43.020401 132255914547008 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.290304s (all_items=0.000017s, per_item={'items': '0.00001669'}, temp_paths=0.290287) I0421 10:21:43.021229 132255914547008 event_tracking.py:125] [process=4] [async] Finished blocking save in 1.02 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints/0. I0421 10:21:43.021495 132128382441216 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 10:41:43.021472 I0421 10:21:43.034711 132255914547008 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 10:21:43.035013 132126225127168 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 10:21:43.035168 132255914547008 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776766901.9987254, 'wait_for_prev_duration_secs': 6.008148193359375e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776766902.0006328, 'checkpointer_blocking_duration_secs': 1.0209710597991943, 'get_old_steps_start_time': 1776766903.021629, 'get_old_steps_duration_secs': 4.00543212890625e-05, 'checkpoint_manager_blocking_start_time': 1776766901.9964406, 'checkpoint_manager_blocking_duration_secs': 1.0386884212493896} I0421 10:21:43.035274 132255914547008 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 10:21:43.035340 132255914547008 max_utils.py:750] Memstats: After params initialized: I0421 10:21:43.035389 132255914547008 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0)) I0421 10:21:43.035423 132255914547008 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0)) I0421 10:21:43.035450 132255914547008 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0)) I0421 10:21:43.035474 132255914547008 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0)) I0421 10:21:43.344840 132255914547008 metric_logger.py:196] completed step: 0, seconds: 1.648, TFLOP/s/device: 32.970, Tokens/s/device: 4969.659, total_weights: 262144, loss: 10.876, lm_loss: 10.876, perplexity: 52883.598 I0421 10:21:43.956136 132255914547008 metric_logger.py:196] completed step: 1, seconds: 12.577, TFLOP/s/device: 4.321, Tokens/s/device: 651.358, total_weights: 262144, loss: 10.876, lm_loss: 10.876, perplexity: 52883.598 I0421 10:21:44.818954 132255914547008 metric_logger.py:196] completed step: 2, seconds: 0.034, TFLOP/s/device: 1588.070, Tokens/s/device: 239371.183, total_weights: 262144, loss: 10.561, lm_loss: 10.561, perplexity: 38601.980 I0421 10:21:45.397616 132255914547008 metric_logger.py:196] completed step: 3, seconds: 0.853, TFLOP/s/device: 63.745, Tokens/s/device: 9608.325, total_weights: 262144, loss: 10.270, lm_loss: 10.270, perplexity: 28865.557 I0421 10:21:45.985032 2608 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 10:21:46.555065 132255914547008 metric_logger.py:196] completed step: 4, seconds: 0.595, TFLOP/s/device: 91.292, Tokens/s/device: 13760.574, total_weights: 262144, loss: 10.021, lm_loss: 10.021, perplexity: 22497.775 I0421 10:21:46.562749 132255914547008 metric_logger.py:196] completed step: 5, seconds: 0.578, TFLOP/s/device: 93.980, Tokens/s/device: 14165.658, total_weights: 262144, loss: 9.819, lm_loss: 9.819, perplexity: 18383.324 I0421 10:21:47.961219 132126233519872 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints/0/items/array_metadatas/process_4 I0421 10:22:20.108722 132128382441216 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 42.264 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.37448525428772 s) (per-host) I0421 10:22:20.108844 132128382441216 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.087269s. I0421 10:22:29.044389 132128382441216 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 46.022798s. I0421 10:22:29.044710 132126225127168 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 10:22:29.044829 132126225127168 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 10:22:29.044878 132126225127168 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 10:22:29.046546 132126225127168 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 10:22:32.128923 132255914547008 metric_logger.py:196] completed step: 6, seconds: 1.158, TFLOP/s/device: 46.930, Tokens/s/device: 7073.777, total_weights: 262144, loss: 9.666, lm_loss: 9.666, perplexity: 15775.117 I0421 10:22:32.707238 132255914547008 metric_logger.py:196] completed step: 7, seconds: 44.989, TFLOP/s/device: 1.208, Tokens/s/device: 182.089, total_weights: 262144, loss: 9.560, lm_loss: 9.560, perplexity: 14192.143 I0421 10:22:33.285695 132255914547008 metric_logger.py:196] completed step: 8, seconds: 0.585, TFLOP/s/device: 92.911, Tokens/s/device: 14004.496, total_weights: 262144, loss: 9.495, lm_loss: 9.495, perplexity: 13292.714 I0421 10:22:33.865015 132255914547008 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 10:22:33.865698 132255914547008 checkpointing.py:798] Waited 0.0006959438323974609 seconds for step 9 to finish before starting checkpointing. I0421 10:22:33.867695 132255914547008 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 10:22:33.869473 132255914547008 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 9 I0421 10:22:33.871000 132255914547008 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints/9. I0421 10:22:34.152268 132255914547008 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 10:22:34.152360 132255914547008 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 10:22:34.185818 132255914547008 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.035219s I0421 10:22:34.185964 132255914547008 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 36.608 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04213738441467285 s) (per-host) I0421 10:22:34.186013 132255914547008 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.042195s (batch_requests_ready=0.002567s, total_serialization_initiated=0.039564s, others=0.000064s) I0421 10:22:34.186097 132255914547008 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.046716s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.046700) I0421 10:22:34.186838 132255914547008 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.32 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints/9. I0421 10:22:34.187103 132121943320320 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 10:42:34.187081 I0421 10:22:34.195144 132255914547008 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 10:22:34.195388 132127412709120 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 10:22:34.195515 132255914547008 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776766953.8676643, 'wait_for_prev_duration_secs': 7.05718994140625e-05, 'time_between_consecutive_saves_sec': 4.821077823638916, 'checkpointer_blocking_start_time': 1776766953.8695168, 'checkpointer_blocking_duration_secs': 0.3176898956298828, 'get_old_steps_start_time': 1776766954.1872292, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776766953.8659325, 'checkpoint_manager_blocking_duration_secs': 0.32954835891723633} I0421 10:22:34.195623 132255914547008 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 10:22:34.195681 132255914547008 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 10:22:39.526444 132127421101824 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_06_grad_accum/checkpoints/9/items/array_metadatas/process_4 I0421 10:23:16.538992 132121943320320 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.259 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.395137310028076 s) (per-host) I0421 10:23:16.539098 132121943320320 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.351915s. I0421 10:23:24.310335 132121943320320 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.123136s. I0421 10:23:24.310580 132127412709120 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 10:23:24.310672 132127412709120 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 10:23:24.310720 132127412709120 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 10:23:24.312461 132127412709120 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 10:23:24.312682 132255914547008 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0421 10:23:24.312855 132255914547008 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 10:23:24.313841 132255914547008 metric_logger.py:196] completed step: 9, seconds: 0.578, TFLOP/s/device: 94.094, Tokens/s/device: 14182.801, total_weights: 262144, loss: 9.457, lm_loss: 9.457, perplexity: 12793.173 Per train step: Total TFLOPs: 54.35 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 10:23:34 UTC 2026 EXIT_CODE=0