XPK Start: Tue Apr 21 17:22:27 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-21 17:22:51.695079: 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 17:22:52.231451 135092037375808 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 17:23:01.271713 135092037375808 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 17:23:01.274079 135092037375808 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-true-1r4c3-slice-job-0-0.mt-10-shardy-true-1r4c3:8482 I0421 17:23:02.811167 135092037375808 max_utils.py:284] Jax distributed system initialized! I0421 17:23:08.967605 135092037375808 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 17:23:08.967713 135092037375808 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 17:23:08.967753 135092037375808 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 17:23:08.967786 135092037375808 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 17:23:09.684710 135092037375808 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 17:23:09.797303 135092037375808 checkpointing.py:688] Setting up checkpoint logger... I0421 17:23:09.797425 135092037375808 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 17:23:09.797470 135092037375808 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 17:23:09.797669 135092037375808 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 0x7adcfabb1520>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 17:23:12.746814 135092037375808 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 17:23:12.747013 135092037375808 checkpoint_manager.py:708] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ac8c00c2060>}, handler_registry=None I0421 17:23:12.747253 135092037375808 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ac8c00c2060>` 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 17:23:12.747300 135092037375808 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ac7b471ef30>` 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 17:23:12.747334 135092037375808 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 0x7ac8c00c2060>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ac8c00c2060>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ac7b471ef30>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ac7b471ef30>}). I0421 17:23:12.747663 135092037375808 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 17:23:12.747732 135092037375808 async_checkpointer.py:192] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7ac898499760> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 17:23:14.228250 135092037375808 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints I0421 17:23:14.263028 135092037375808 checkpoint_manager.py:929] [process=3][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_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7ac7b47aa300> I0421 17:23:14.263164 135092037375808 checkpointing.py:302] Checkpoint manager created! I0421 17:23:15.235642 135092037375808 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 17:23:15.235766 135092037375808 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 17:23:17.032472 135092037375808 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 17:23:17.032570 135092037375808 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 17:23:17.038104 135092037375808 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 17:23:17.038159 135092037375808 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 17:23:17.054415 135092037375808 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 17:23:17.054476 135092037375808 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 17:23:17.070124 135092037375808 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 17:23:17.070188 135092037375808 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 17:23:17.094211 135092037375808 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 17:23:17.094274 135092037375808 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 17:23:17.110072 135092037375808 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 17:23:17.110130 135092037375808 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 17:23:17.125872 135092037375808 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 17:23:17.125942 135092037375808 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 17:23:17.155632 135092037375808 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 17:23:17.155708 135092037375808 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 17:23:17.175828 135092037375808 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 17:23:17.175891 135092037375808 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 17:23:28.245074 135092037375808 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 17:23:28.247390 135092037375808 metric_logger.py:301] number parameters: 1.104 billion I0421 17:23:39.311569 135092037375808 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 17:23:39.467422 135092037375808 checkpointing.py:798] Waited 0.1558377742767334 seconds for step 0 to finish before starting checkpointing. I0421 17:23:39.469862 135092037375808 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 17:23:39.471557 135092037375808 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 0 I0421 17:23:39.473216 135092037375808 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints/0. I0421 17:23:40.228939 135092037375808 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 17:23:40.230024 135092037375808 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 17:23:40.230080 135092037375808 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 17:23:40.507622 135092037375808 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.279454s I0421 17:23:40.507807 135092037375808 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 5.350 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28835439682006836 s) (per-host) I0421 17:23:40.507863 135092037375808 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.288421s (batch_requests_ready=0.002949s, total_serialization_initiated=0.285397s, others=0.000075s) I0421 17:23:40.507999 135092037375808 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.292492s (all_items=0.000018s, per_item={'items': '0.00001812'}, temp_paths=0.292474) I0421 17:23:40.508818 135092037375808 event_tracking.py:125] [process=3] [async] Finished blocking save in 1.04 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints/0. I0421 17:23:40.509103 134963336410880 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:43:40.509079 I0421 17:23:40.520915 135092037375808 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 17:23:40.521178 134961722009344 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0421 17:23:40.521300 135092037375808 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776792219.4698427, 'wait_for_prev_duration_secs': 5.8650970458984375e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776792219.4715967, 'checkpointer_blocking_duration_secs': 1.0376052856445312, 'get_old_steps_start_time': 1776792220.509227, 'get_old_steps_duration_secs': 3.0040740966796875e-05, 'checkpoint_manager_blocking_start_time': 1776792219.4678252, 'checkpoint_manager_blocking_duration_secs': 1.0534358024597168} I0421 17:23:40.521406 135092037375808 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 17:23:40.521479 135092037375808 max_utils.py:750] Memstats: After params initialized: I0421 17:23:40.521530 135092037375808 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0)) I0421 17:23:40.521561 135092037375808 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0)) I0421 17:23:40.521588 135092037375808 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0)) I0421 17:23:40.521614 135092037375808 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0)) I0421 17:23:40.835875 135092037375808 metric_logger.py:196] completed step: 0, seconds: 11.063, TFLOP/s/device: 1.228, Tokens/s/device: 185.120, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0421 17:23:41.016826 135092037375808 metric_logger.py:196] completed step: 1, seconds: 1.522, TFLOP/s/device: 8.925, Tokens/s/device: 1345.258, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0421 17:23:41.443175 135092037375808 metric_logger.py:196] completed step: 2, seconds: 0.035, TFLOP/s/device: 392.431, Tokens/s/device: 59151.431, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0421 17:23:41.591133 135092037375808 metric_logger.py:196] completed step: 3, seconds: 0.416, TFLOP/s/device: 32.656, Tokens/s/device: 4922.272, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0421 17:23:41.886575 135092037375808 metric_logger.py:196] completed step: 4, seconds: 0.164, TFLOP/s/device: 82.633, Tokens/s/device: 12455.300, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0421 17:23:41.893825 135092037375808 metric_logger.py:196] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.039, Tokens/s/device: 13873.177, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0421 17:23:48.572206 2852 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 17:23:50.595295 134962245842688 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints/0/items/array_metadatas/process_3 I0421 17:24:04.121516 135092037375808 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.924, Tokens/s/device: 6922.193, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0421 17:24:04.268954 135092037375808 metric_logger.py:196] completed step: 7, seconds: 22.082, TFLOP/s/device: 0.615, Tokens/s/device: 92.747, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0421 17:24:04.416682 135092037375808 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.858, Tokens/s/device: 13393.587, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0421 17:24:04.564786 135092037375808 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 17:24:04.565459 135092037375808 checkpointing.py:798] Waited 0.0006830692291259766 seconds for step 9 to finish before starting checkpointing. I0421 17:24:04.567426 135092037375808 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 17:24:23.359575 134963336410880 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 36.616 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.14008402824402 s) (per-host) I0421 17:24:23.359706 134963336410880 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.850531s. I0421 17:24:30.843464 134963336410880 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 50.334274s. I0421 17:24:30.843723 134961722009344 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 17:24:30.843799 134961722009344 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0421 17:24:30.843849 134961722009344 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 17:24:30.846589 134961722009344 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 17:24:30.846781 135092037375808 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0421 17:24:30.846961 135092037375808 checkpoint_manager.py:1452] Waiting for previous save to complete took 26.279519 seconds. If this number is high, consider checkpointing less frequently. I0421 17:24:30.848785 135092037375808 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 9 I0421 17:24:30.851884 135092037375808 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints/9. I0421 17:24:31.145809 135092037375808 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 17:24:31.145900 135092037375808 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 17:24:31.186713 135092037375808 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042552s I0421 17:24:31.186888 135092037375808 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 31.145 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04952836036682129 s) (per-host) I0421 17:24:31.186955 135092037375808 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.049604s (batch_requests_ready=0.002668s, total_serialization_initiated=0.046854s, others=0.000082s) I0421 17:24:31.187057 135092037375808 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.053937s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.053922) I0421 17:24:31.187843 135092037375808 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.34 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints/9. I0421 17:24:31.188176 134961722009344 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:44:31.188144 I0421 17:24:31.190455 135092037375808 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 17:24:31.190758 134938544305920 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0421 17:24:31.190944 135092037375808 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776792244.5673957, 'wait_for_prev_duration_secs': 26.279518604278564, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776792270.8488243, 'checkpointer_blocking_duration_secs': 0.33949756622314453, 'get_old_steps_start_time': 1776792271.1883495, 'get_old_steps_duration_secs': 3.62396240234375e-05, 'checkpoint_manager_blocking_start_time': 1776792244.5656898, 'checkpoint_manager_blocking_duration_secs': 26.62519907951355} I0421 17:24:31.191078 135092037375808 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 17:24:31.191134 135092037375808 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 17:24:36.336456 134962245842688 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_10_shardy_true/checkpoints/9/items/array_metadatas/process_3 I0421 17:25:14.637819 134961722009344 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 36.312 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.50041842460632 s) (per-host) I0421 17:25:14.637953 134961722009344 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.449662s. I0421 17:25:20.413531 134961722009344 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 49.225225s. I0421 17:25:20.413836 134938544305920 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 17:25:20.413991 134938544305920 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0421 17:25:20.414043 134938544305920 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 17:25:20.416423 134938544305920 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 17:25:20.416605 135092037375808 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0421 17:25:20.416786 135092037375808 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 17:25:20.417728 135092037375808 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.988, Tokens/s/device: 13865.381, 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: Tue Apr 21 17:25:32 UTC 2026 EXIT_CODE=0