XPK Start: Mon Apr 20 09:48:27 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 09:48:51.143668: 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 09:48:51.323024 135122983827264 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 09:49:00.365057 135122983827264 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 09:49:00.367372 135122983827264 distributed.py:172] Connecting to JAX distributed service on mt-01-base-02c9m-slice-job-0-0.mt-01-base-02c9m:8482 I0420 09:49:01.769227 135122983827264 max_utils.py:284] Jax distributed system initialized! I0420 09:49:08.066013 135122983827264 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 09:49:08.066118 135122983827264 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 09:49:08.066158 135122983827264 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 09:49:08.066192 135122983827264 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 09:49:09.123032 135122983827264 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 09:49:09.238045 135122983827264 checkpointing.py:688] Setting up checkpoint logger... I0420 09:49:09.238167 135122983827264 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 09:49:09.238212 135122983827264 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 09:49:09.238409 135122983827264 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 0x7ae40dc4b800>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 09:49:12.607458 135122983827264 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 09:49:12.607711 135122983827264 checkpoint_manager.py:708] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ae3016afce0>}, handler_registry=None I0420 09:49:12.607956 135122983827264 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ae3016afce0>` 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 09:49:12.608006 135122983827264 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ae3017c2330>` 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 09:49:12.608042 135122983827264 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 0x7ae3016afce0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ae3016afce0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ae3017c2330>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ae3017c2330>}). I0420 09:49:12.608402 135122983827264 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 09:49:12.608476 135122983827264 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7acf1c779bc0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 09:49:13.801933 135122983827264 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints I0420 09:49:14.205828 135122983827264 checkpoint_manager.py:929] [process=5][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_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7ae3017df6b0> I0420 09:49:14.206009 135122983827264 checkpointing.py:302] Checkpoint manager created! I0420 09:49:15.170177 135122983827264 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 09:49:15.170292 135122983827264 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 09:49:16.989193 135122983827264 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 09:49:16.989288 135122983827264 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 09:49:16.994909 135122983827264 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 09:49:16.994969 135122983827264 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 09:49:17.011267 135122983827264 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 09:49:17.011326 135122983827264 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 09:49:17.027044 135122983827264 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 09:49:17.027101 135122983827264 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 09:49:17.051096 135122983827264 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 09:49:17.051168 135122983827264 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 09:49:17.066976 135122983827264 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 09:49:17.067036 135122983827264 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 09:49:17.082956 135122983827264 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 09:49:17.083017 135122983827264 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 09:49:17.114634 135122983827264 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 09:49:17.114704 135122983827264 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 09:49:17.134633 135122983827264 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 09:49:17.134695 135122983827264 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 09:49:28.268331 135122983827264 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 09:49:28.270799 135122983827264 metric_logger.py:301] number parameters: 1.104 billion I0420 09:49:39.357658 135122983827264 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 09:49:39.509874 135122983827264 checkpointing.py:798] Waited 0.15219902992248535 seconds for step 0 to finish before starting checkpointing. I0420 09:49:39.512329 135122983827264 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 09:49:39.514124 135122983827264 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0 I0420 09:49:39.515620 135122983827264 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints/0. I0420 09:49:39.931602 135122983827264 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 09:49:39.932664 135122983827264 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 09:49:39.932724 135122983827264 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 09:49:40.208104 135122983827264 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.277283s I0420 09:49:40.208275 135122983827264 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.388 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2863011360168457 s) (per-host) I0420 09:49:40.208328 135122983827264 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.286365s (batch_requests_ready=0.002973s, total_serialization_initiated=0.283320s, others=0.000072s) I0420 09:49:40.208427 135122983827264 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.290503s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.290486) I0420 09:49:40.209277 135122983827264 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.70 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints/0. I0420 09:49:40.209602 134993094645504 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 10:09:40.209564 I0420 09:49:40.224911 135122983827264 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 09:49:40.225234 134991493199616 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0420 09:49:40.225394 135122983827264 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776678579.512311, 'wait_for_prev_duration_secs': 6.0558319091796875e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776678579.514164, 'checkpointer_blocking_duration_secs': 0.6955511569976807, 'get_old_steps_start_time': 1776678580.2097428, 'get_old_steps_duration_secs': 3.1948089599609375e-05, 'checkpoint_manager_blocking_start_time': 1776678579.510258, 'checkpoint_manager_blocking_duration_secs': 0.715094804763794} I0420 09:49:40.225506 135122983827264 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 09:49:40.225577 135122983827264 max_utils.py:750] Memstats: After params initialized: I0420 09:49:40.225642 135122983827264 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0)) I0420 09:49:40.225677 135122983827264 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0)) I0420 09:49:40.225705 135122983827264 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0)) I0420 09:49:40.225729 135122983827264 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0)) I0420 09:49:40.539913 135122983827264 metric_logger.py:196] completed step: 0, seconds: 11.086, TFLOP/s/device: 1.226, Tokens/s/device: 184.742, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 09:49:40.724581 135122983827264 metric_logger.py:196] completed step: 1, seconds: 1.180, TFLOP/s/device: 11.512, Tokens/s/device: 1735.198, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 09:49:41.226243 135122983827264 metric_logger.py:196] completed step: 2, seconds: 0.039, TFLOP/s/device: 345.105, Tokens/s/device: 52017.983, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0420 09:49:41.373843 135122983827264 metric_logger.py:196] completed step: 3, seconds: 0.490, TFLOP/s/device: 27.719, Tokens/s/device: 4178.066, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0420 09:49:41.669683 135122983827264 metric_logger.py:196] completed step: 4, seconds: 0.165, TFLOP/s/device: 82.360, Tokens/s/device: 12414.228, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0420 09:49:41.677361 135122983827264 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.236, Tokens/s/device: 13902.749, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0420 09:49:43.232673 2817 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 09:49:45.308006 134992381318912 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints/0/items/array_metadatas/process_5 I0420 09:50:03.616380 135122983827264 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.836, Tokens/s/device: 6908.952, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0420 09:50:03.764252 135122983827264 metric_logger.py:196] completed step: 7, seconds: 21.793, TFLOP/s/device: 0.623, Tokens/s/device: 93.977, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0420 09:50:03.911852 135122983827264 metric_logger.py:196] completed step: 8, seconds: 0.154, TFLOP/s/device: 88.503, Tokens/s/device: 13340.108, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0420 09:50:04.060107 135122983827264 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 09:50:04.060789 135122983827264 checkpointing.py:798] Waited 0.0006923675537109375 seconds for step 9 to finish before starting checkpointing. I0420 09:50:04.062992 135122983827264 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 09:50:17.046863 134993094645504 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 42.548 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.12485909461975 s) (per-host) I0420 09:50:17.046970 134993094645504 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.837288s. I0420 09:50:25.647697 134993094645504 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 45.437998s. I0420 09:50:25.647984 134991493199616 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 09:50:25.648114 134991493199616 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0420 09:50:25.648166 134991493199616 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 09:50:25.650266 134991493199616 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 09:50:25.650433 135122983827264 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0420 09:50:25.650564 135122983827264 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.587570 seconds. If this number is high, consider checkpointing less frequently. I0420 09:50:25.652342 135122983827264 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9 I0420 09:50:25.654412 135122983827264 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints/9. I0420 09:50:25.962312 135122983827264 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 09:50:25.962402 135122983827264 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 09:50:25.995538 135122983827264 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034825s I0420 09:50:25.995730 135122983827264 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 36.593 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.042154550552368164 s) (per-host) I0420 09:50:25.995782 135122983827264 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.042217s (batch_requests_ready=0.002703s, total_serialization_initiated=0.039444s, others=0.000070s) I0420 09:50:25.995881 135122983827264 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.046550s (all_items=0.000014s, per_item={'items': '0.00001407'}, temp_paths=0.046535) I0420 09:50:25.996559 135122983827264 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.34 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints/9. I0420 09:50:25.996896 134971805124352 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 10:10:25.996857 I0420 09:50:25.998936 135122983827264 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 09:50:25.999260 134991493199616 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0420 09:50:25.999398 135122983827264 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776678604.0629618, 'wait_for_prev_duration_secs': 21.587570190429688, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776678625.6523805, 'checkpointer_blocking_duration_secs': 0.34465932846069336, 'get_old_steps_start_time': 1776678625.9970634, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776678604.061015, 'checkpoint_manager_blocking_duration_secs': 21.938347816467285} I0420 09:50:25.999564 135122983827264 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 09:50:25.999619 135122983827264 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 09:50:32.011246 134992381318912 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260420_081533_01_base/checkpoints/9/items/array_metadatas/process_5 I0420 09:51:08.033534 134971805124352 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.538 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.079920291900635 s) (per-host) I0420 09:51:08.033659 134971805124352 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.036649s. I0420 09:51:16.900130 134971805124352 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 50.903103s. I0420 09:51:16.900413 134991493199616 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 09:51:16.900542 134991493199616 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0420 09:51:16.900608 134991493199616 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 09:51:16.902348 134991493199616 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 09:51:16.902542 135122983827264 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 09:51:16.902725 135122983827264 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 09:51:16.903709 135122983827264 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.657, Tokens/s/device: 13815.528, 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 09:51:27 UTC 2026 EXIT_CODE=0