XPK Start: Mon Apr 20 17:46:56 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-20 17:47:20.505649: 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 17:47:20.684544 138815951419200 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 17:47:29.724189 138815951419200 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 17:47:29.726455 138815951419200 distributed.py:172] Connecting to JAX distributed service on mt-07-eval-wrv83-slice-job-0-0.mt-07-eval-wrv83:8482 I0420 17:47:32.632542 138815951419200 max_utils.py:284] Jax distributed system initialized! I0420 17:47:38.819301 138815951419200 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 17:47:38.819401 138815951419200 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 17:47:38.819441 138815951419200 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 I0420 17:47:38.819475 138815951419200 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 17:47:39.859188 138815951419200 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 17:47:39.973129 138815951419200 checkpointing.py:688] Setting up checkpoint logger... I0420 17:47:39.973240 138815951419200 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 17:47:39.973284 138815951419200 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 17:47:39.973472 138815951419200 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 0x7e3ffd71b1d0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 17:47:42.500048 138815951419200 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 17:47:42.500297 138815951419200 checkpoint_manager.py:708] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e3ed78eda30>}, handler_registry=None I0420 17:47:42.500529 138815951419200 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e3ed78eda30>` 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 17:47:42.500577 138815951419200 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e2bd44cb170>` 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 17:47:42.500612 138815951419200 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 0x7e3ed78eda30>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e3ed78eda30>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e2bd44cb170>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e2bd44cb170>}). I0420 17:47:42.500940 138815951419200 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 17:47:42.501009 138815951419200 async_checkpointer.py:192] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e2afc62c4a0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 17:47:43.833566 138815951419200 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints I0420 17:47:43.985531 138815951419200 checkpoint_manager.py:929] [process=0][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_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e3ed7d52ab0> I0420 17:47:43.985698 138815951419200 checkpointing.py:302] Checkpoint manager created! I0420 17:47:44.933767 138815951419200 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 17:47:44.933885 138815951419200 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 17:47:46.294951 138815951419200 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0420 17:47:46.295065 138815951419200 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 17:47:46.295129 138815951419200 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 17:47:46.295173 138815951419200 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0420 17:47:46.295209 138815951419200 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 17:47:46.295242 138815951419200 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 17:47:46.295278 138815951419200 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:47:46.295313 138815951419200 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0420 17:47:46.295347 138815951419200 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:47:46.295379 138815951419200 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:47:46.295413 138815951419200 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0420 17:47:46.295445 138815951419200 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0420 17:47:46.704479 138815951419200 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 17:47:46.704571 138815951419200 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:47:46.711278 138815951419200 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 17:47:46.711386 138815951419200 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:47:46.732039 138815951419200 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 17:47:46.732117 138815951419200 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:47:46.747739 138815951419200 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 17:47:46.747799 138815951419200 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:47:46.777245 138815951419200 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 17:47:46.777344 138815951419200 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:47:46.793245 138815951419200 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 17:47:46.793306 138815951419200 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:47:46.808883 138815951419200 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 17:47:46.808942 138815951419200 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:47:46.839016 138815951419200 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 17:47:46.839098 138815951419200 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:47:46.858796 138815951419200 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 17:47:46.858859 138815951419200 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 17:47:58.258748 138815951419200 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 17:47:58.268199 138815951419200 metric_logger.py:301] number parameters: 1.104 billion I0420 17:48:09.801244 138815951419200 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 17:48:09.952838 138815951419200 checkpointing.py:798] Waited 0.15157485008239746 seconds for step 0 to finish before starting checkpointing. I0420 17:48:09.955102 138815951419200 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 17:48:09.956938 138815951419200 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 0 I0420 17:48:09.958472 138815951419200 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0. I0420 17:48:10.724127 138815951419200 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 17:48:10.743722 138815951419200 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 17:48:10.743794 138815951419200 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 17:48:10.989564 138688805705472 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0 I0420 17:48:11.015735 138815951419200 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.273447s I0420 17:48:11.016541 138815951419200 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 5.426 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2842984199523926 s) (per-host) I0420 17:48:11.016606 138815951419200 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.284379s (batch_requests_ready=0.003029s, total_serialization_initiated=0.280621s, others=0.000729s) I0420 17:48:11.016676 138815951419200 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.288433s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.288415) I0420 17:48:11.017422 138815951419200 event_tracking.py:125] [process=0] [async] Finished blocking save in 1.06 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0. I0420 17:48:11.017749 138688814098176 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 18:08:11.017711 I0420 17:48:11.026936 138815951419200 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 17:48:11.027232 138686662428416 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 17:48:11.027387 138815951419200 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776707289.9550686, 'wait_for_prev_duration_secs': 7.43865966796875e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776707289.9569776, 'checkpointer_blocking_duration_secs': 1.0608723163604736, 'get_old_steps_start_time': 1776707291.0178735, 'get_old_steps_duration_secs': 2.6702880859375e-05, 'checkpoint_manager_blocking_start_time': 1776707289.9532552, 'checkpoint_manager_blocking_duration_secs': 1.074094533920288} I0420 17:48:11.027498 138815951419200 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 17:48:11.027570 138815951419200 max_utils.py:750] Memstats: After params initialized: I0420 17:48:11.027621 138815951419200 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_0(process=0,(0,0,0,0)) I0420 17:48:11.027652 138815951419200 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_1(process=0,(1,0,0,0)) I0420 17:48:11.027680 138815951419200 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_4(process=0,(0,1,0,0)) I0420 17:48:11.027706 138815951419200 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_5(process=0,(1,1,0,0)) I0420 17:48:11.382699 138815951419200 metric_logger.py:196] completed step: 0, seconds: 11.199, TFLOP/s/device: 1.213, Tokens/s/device: 182.882, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 17:48:11.385826 138815951419200 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/tensorboard/' I0420 17:48:11.813339 138815951419200 metric_logger.py:196] completed step: 1, seconds: 1.577, TFLOP/s/device: 8.614, Tokens/s/device: 1298.325, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 17:48:11.955096 138815951419200 metric_logger.py:196] completed step: 2, seconds: 0.432, TFLOP/s/device: 31.455, Tokens/s/device: 4741.300, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0420 17:48:12.102574 138815951419200 metric_logger.py:196] completed step: 3, seconds: 0.013, TFLOP/s/device: 1062.491, Tokens/s/device: 160150.141, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0420 17:48:12.965862 138688269321984 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0/items I0420 17:48:13.147346 138685046195968 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776707292707210489, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776707292707210489, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0420 17:48:14.145651 2838 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 17:48:15.912185 138687190447872 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0/items/array_metadatas/process_0 I0420 17:48:34.541498 138815951419200 metric_logger.py:196] completed step: 4, seconds: 0.143, TFLOP/s/device: 94.916, Tokens/s/device: 14306.771, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0420 17:48:34.552063 138815951419200 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.574, Tokens/s/device: 13953.805, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0420 17:48:34.696721 138815951419200 metric_logger.py:196] completed step: 6, seconds: 22.437, TFLOP/s/device: 0.606, Tokens/s/device: 91.276, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0420 17:48:34.844160 138815951419200 metric_logger.py:196] completed step: 7, seconds: 0.008, TFLOP/s/device: 1706.283, Tokens/s/device: 257189.501, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0420 17:48:34.991519 138815951419200 metric_logger.py:196] completed step: 8, seconds: 0.146, TFLOP/s/device: 92.862, Tokens/s/device: 13997.198, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0420 17:48:35.139769 138815951419200 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 17:48:35.140480 138815951419200 checkpointing.py:798] Waited 0.0007233619689941406 seconds for step 9 to finish before starting checkpointing. I0420 17:48:35.142611 138815951419200 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 17:48:51.470255 138686708578048 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 37.337914s (commit=36.103671s, array_metadata_write=1.234243s) I0420 17:48:51.471314 138688814098176 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 38.774 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.739041328430176 s) (per-host) I0420 17:48:51.471436 138688814098176 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.453016s. I0420 17:48:52.254723 138688814098176 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776707292707210489, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0420 17:48:52.987885 138688814098176 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000425s. I0420 17:48:53.045236 138685046195968 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776707292707210489, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0420 17:48:53.658584 138688814098176 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0420 17:48:54.590931 138688814098176 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 2.207905s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0/items I0420 17:48:54.592778 138688814098176 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0/items I0420 17:48:55.131526 138688814098176 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0 I0420 17:48:56.971383 138688814098176 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0`. I0420 17:48:56.972066 138688814098176 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 47.02 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/0 I0420 17:48:56.973702 138688814098176 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 45.955279s. I0420 17:48:56.973891 138686662428416 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 17:48:56.974007 138686662428416 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 17:48:56.974069 138686662428416 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 17:48:56.976737 138686662428416 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 17:48:56.976866 138815951419200 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0420 17:48:56.977007 138815951419200 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.834395 seconds. If this number is high, consider checkpointing less frequently. I0420 17:48:56.978940 138815951419200 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 9 I0420 17:48:56.981027 138815951419200 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9. I0420 17:48:57.277532 138815951419200 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 17:48:57.277630 138815951419200 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 17:48:57.305509 138815951419200 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.029342s I0420 17:48:57.306376 138815951419200 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 40.505 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.038083791732788086 s) (per-host) I0420 17:48:57.306452 138815951419200 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038178s (batch_requests_ready=0.002647s, total_serialization_initiated=0.034747s, others=0.000784s) I0420 17:48:57.306535 138815951419200 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.042134s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.042119) I0420 17:48:57.307267 138815951419200 event_tracking.py:125] [process=0] [async] Finished blocking save in 0.33 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9. I0420 17:48:57.307527 138686662428416 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 18:08:57.307506 I0420 17:48:57.314512 138815951419200 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 17:48:57.314747 138686691792640 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 17:48:57.314872 138815951419200 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776707315.1425803, 'wait_for_prev_duration_secs': 21.834394693374634, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776707336.9789772, 'checkpointer_blocking_duration_secs': 0.3286399841308594, 'get_old_steps_start_time': 1776707337.3076391, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776707315.1407037, 'checkpoint_manager_blocking_duration_secs': 22.174136638641357} I0420 17:48:57.314981 138815951419200 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 17:48:57.315023 138815951419200 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 17:48:57.518344 138688814098176 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9 I0420 17:48:59.367192 138687773927168 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9/items I0420 17:49:02.946491 138687190447872 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9/items/array_metadatas/process_0 I0420 17:49:42.144118 138686708578048 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.632353s (commit=40.426464s, array_metadata_write=1.205889s) I0420 17:49:42.145417 138686662428416 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 35.198 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 44.8770911693573 s) (per-host) I0420 17:49:42.145543 138686662428416 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 44.837945s. I0420 17:49:43.656327 138686662428416 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000429s. I0420 17:49:43.863554 138686662428416 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0420 17:49:45.002333 138686662428416 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.977430s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9/items I0420 17:49:45.005331 138686662428416 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9/items I0420 17:49:45.521784 138686662428416 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9 I0420 17:49:46.922250 138686662428416 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9`. I0420 17:49:46.922937 138686662428416 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 49.94 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_07_eval/checkpoints/9 I0420 17:49:46.924541 138686662428416 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 49.616942s. I0420 17:49:46.924688 138686691792640 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 17:49:46.924752 138686691792640 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 17:49:46.924808 138686691792640 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 17:49:46.926918 138686691792640 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 17:49:46.927104 138815951419200 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 17:49:46.927275 138815951419200 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 17:49:46.928254 138815951419200 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.499, Tokens/s/device: 13942.406, total_weights: 65536, loss: 8.175, lm_loss: 8.175, perplexity: 3551.438 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Mon Apr 20 17:49:56 UTC 2026 EXIT_CODE=0