XPK Start: Mon Apr 20 10:24:55 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 10:25:19.728043: 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 10:25:19.907490 140049080088384 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 10:25:28.949180 140049080088384 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 10:25:28.951515 140049080088384 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-false-x6k51-slice-job-0-0.mt-10-shardy-false-x6k51:8482 I0420 10:25:29.746242 140049080088384 max_utils.py:284] Jax distributed system initialized! I0420 10:25:35.920228 140049080088384 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 10:25:35.920330 140049080088384 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 10:25:35.920370 140049080088384 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 10:25:35.920403 140049080088384 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 10:25:36.641040 140049080088384 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 10:25:36.752696 140049080088384 checkpointing.py:688] Setting up checkpoint logger... I0420 10:25:36.752810 140049080088384 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 10:25:36.752855 140049080088384 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 10:25:36.753057 140049080088384 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 0x7f5f2658e9f0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 10:25:39.641217 140049080088384 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 10:25:39.641463 140049080088384 checkpoint_manager.py:708] [process=2][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4ac07b6870>}, handler_registry=None I0420 10:25:39.641695 140049080088384 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4ac07b6870>` 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 10:25:39.641743 140049080088384 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f4af8285940>` 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 10:25:39.641777 140049080088384 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 0x7f4ac07b6870>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4ac07b6870>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f4af8285940>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f4af8285940>}). I0420 10:25:39.642105 140049080088384 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 10:25:39.642175 140049080088384 async_checkpointer.py:192] [process=2][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7f4ac0681b20> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 10:25:40.715749 140049080088384 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_10_shardy_false/checkpoints I0420 10:25:41.132902 140049080088384 checkpoint_manager.py:929] [process=2][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_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f4ac06d3fe0> I0420 10:25:41.133099 140049080088384 checkpointing.py:302] Checkpoint manager created! I0420 10:25:42.102558 140049080088384 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 10:25:42.102674 140049080088384 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 10:25:43.851080 140049080088384 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 10:25:43.851182 140049080088384 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 10:25:43.856660 140049080088384 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 10:25:43.856717 140049080088384 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 10:25:43.872914 140049080088384 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 10:25:43.872977 140049080088384 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 10:25:43.888629 140049080088384 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 10:25:43.888686 140049080088384 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 10:25:43.913607 140049080088384 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 10:25:43.913678 140049080088384 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 10:25:43.929386 140049080088384 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 10:25:43.929446 140049080088384 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 10:25:43.945243 140049080088384 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 10:25:43.945302 140049080088384 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 10:25:43.974794 140049080088384 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 10:25:43.974865 140049080088384 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 10:25:43.994739 140049080088384 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 10:25:43.994804 140049080088384 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 10:25:55.332522 140049080088384 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 10:25:55.334929 140049080088384 metric_logger.py:301] number parameters: 1.104 billion I0420 10:26:06.739089 140049080088384 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 10:26:06.891956 140049080088384 checkpointing.py:798] Waited 0.15285301208496094 seconds for step 0 to finish before starting checkpointing. I0420 10:26:06.894400 140049080088384 checkpoint_manager.py:2009] [process=2][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 10:26:06.896249 140049080088384 checkpoint_manager.py:1512] [process=2] Saving checkpoint at step 0 I0420 10:26:06.897545 140049080088384 event_tracking.py:70] [process=2] [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_10_shardy_false/checkpoints/0. I0420 10:26:07.247247 140049080088384 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 10:26:07.248186 140049080088384 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 10:26:07.248244 140049080088384 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 10:26:07.525474 140049080088384 base_pytree_checkpoint_handler.py:154] [process=2][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.279030s I0420 10:26:07.525646 140049080088384 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/blocking_gbytes_per_sec: 5.342 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2887449264526367 s) (per-host) I0420 10:26:07.525697 140049080088384 base_pytree_checkpoint_handler.py:768] [process=2][thread=MainThread] Initiated Pytree async_save. Time taken: 0.288805s (batch_requests_ready=0.003533s, total_serialization_initiated=0.285204s, others=0.000068s) I0420 10:26:07.525792 140049080088384 composite_checkpoint_handler.py:715] [process=2][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.292872s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.292855) I0420 10:26:07.526646 140049080088384 event_tracking.py:125] [process=2] [async] Finished blocking save in 0.63 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_10_shardy_false/checkpoints/0. I0420 10:26:07.526901 139920653092608 async_checkpointer.py:76] [process=2][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 10:46:07.526876 I0420 10:26:07.531029 140049080088384 checkpoint_manager.py:1560] [process=2][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 10:26:07.531269 139919095756544 async_checkpointer.py:280] [process=2][thread=save_finalize] Waiting for background save thread=async_save. I0420 10:26:07.531393 140049080088384 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_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776680766.894382, 'wait_for_prev_duration_secs': 5.888938903808594e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776680766.8962872, 'checkpointer_blocking_duration_secs': 0.6307408809661865, 'get_old_steps_start_time': 1776680767.5270562, 'get_old_steps_duration_secs': 3.0040740966796875e-05, 'checkpoint_manager_blocking_start_time': 1776680766.892358, 'checkpoint_manager_blocking_duration_secs': 0.6389915943145752} I0420 10:26:07.531507 140049080088384 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 10:26:07.531577 140049080088384 max_utils.py:750] Memstats: After params initialized: I0420 10:26:07.531626 140049080088384 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_8(process=2,(0,2,0,0)) I0420 10:26:07.531658 140049080088384 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_9(process=2,(1,2,0,0)) I0420 10:26:07.531686 140049080088384 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_12(process=2,(0,3,0,0)) I0420 10:26:07.531711 140049080088384 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_13(process=2,(1,3,0,0)) I0420 10:26:07.850131 140049080088384 metric_logger.py:196] completed step: 0, seconds: 11.403, TFLOP/s/device: 1.192, Tokens/s/device: 179.601, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 10:26:08.023798 140049080088384 metric_logger.py:196] completed step: 1, seconds: 1.109, TFLOP/s/device: 12.253, Tokens/s/device: 1846.852, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 10:26:08.462637 140049080088384 metric_logger.py:196] completed step: 2, seconds: 0.028, TFLOP/s/device: 488.236, Tokens/s/device: 73592.296, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0420 10:26:08.610127 140049080088384 metric_logger.py:196] completed step: 3, seconds: 0.429, TFLOP/s/device: 31.702, Tokens/s/device: 4778.426, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0420 10:26:08.905865 140049080088384 metric_logger.py:196] completed step: 4, seconds: 0.165, TFLOP/s/device: 82.134, Tokens/s/device: 12380.158, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0420 10:26:08.913537 140049080088384 metric_logger.py:196] completed step: 5, seconds: 0.146, TFLOP/s/device: 93.001, Tokens/s/device: 14018.180, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0420 10:26:10.923996 2847 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 10:26:12.946329 139919581050624 array_metadata_store.py:203] [process=2][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_10_shardy_false/checkpoints/0/items/array_metadatas/process_2 I0420 10:26:31.472700 140049080088384 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.843, Tokens/s/device: 6909.978, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0420 10:26:31.620232 140049080088384 metric_logger.py:196] completed step: 7, seconds: 22.413, TFLOP/s/device: 0.606, Tokens/s/device: 91.375, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0420 10:26:31.767953 140049080088384 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.634, Tokens/s/device: 13359.862, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0420 10:26:31.916220 140049080088384 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 10:26:31.916872 140049080088384 checkpointing.py:798] Waited 0.0006639957427978516 seconds for step 9 to finish before starting checkpointing. I0420 10:26:31.918887 140049080088384 checkpoint_manager.py:2020] [process=2][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 10:26:44.900032 139920653092608 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/gbytes_per_sec: 41.940 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.66307830810547 s) (per-host) I0420 10:26:44.900155 139920653092608 async_checkpointer.py:90] [process=2][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.373175s. I0420 10:26:51.717689 139920653092608 async_checkpointer.py:160] [process=2][thread=async_save] Background save thread done. Time taken: 44.190691s. I0420 10:26:51.717930 139919095756544 async_checkpointer.py:288] [process=2][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 10:26:51.717999 139919095756544 async_checkpointer.py:298] [process=2][thread=save_finalize] No errors found in background save thread=async_save. I0420 10:26:51.718070 139919095756544 checkpoint_manager.py:2137] [process=2][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 10:26:51.720675 139919095756544 checkpoint_manager.py:2146] [process=2][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 10:26:51.720851 140049080088384 checkpoint_manager.py:2032] [process=2][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0420 10:26:51.720986 140049080088384 checkpoint_manager.py:1452] Waiting for previous save to complete took 19.802099 seconds. If this number is high, consider checkpointing less frequently. I0420 10:26:51.722789 140049080088384 checkpoint_manager.py:1512] [process=2] Saving checkpoint at step 9 I0420 10:26:51.724838 140049080088384 event_tracking.py:70] [process=2] [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_10_shardy_false/checkpoints/9. I0420 10:26:52.456540 140049080088384 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 10:26:52.456636 140049080088384 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 10:26:52.493132 140049080088384 base_pytree_checkpoint_handler.py:154] [process=2][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.038166s I0420 10:26:52.493295 140049080088384 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/blocking_gbytes_per_sec: 33.877 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04553508758544922 s) (per-host) I0420 10:26:52.493345 140049080088384 base_pytree_checkpoint_handler.py:768] [process=2][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045594s (batch_requests_ready=0.002918s, total_serialization_initiated=0.042611s, others=0.000064s) I0420 10:26:52.493444 140049080088384 composite_checkpoint_handler.py:715] [process=2][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.049722s (all_items=0.000015s, per_item={'items': '0.00001478'}, temp_paths=0.049707) I0420 10:26:52.494115 140049080088384 event_tracking.py:125] [process=2] [async] Finished blocking save in 0.77 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_10_shardy_false/checkpoints/9. I0420 10:26:52.494463 139919095756544 async_checkpointer.py:76] [process=2][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 10:46:52.494426 I0420 10:26:52.496426 140049080088384 checkpoint_manager.py:1560] [process=2][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 10:26:52.496712 139915818022656 async_checkpointer.py:280] [process=2][thread=save_finalize] Waiting for background save thread=async_save. I0420 10:26:52.496846 140049080088384 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_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776680791.9188585, 'wait_for_prev_duration_secs': 19.802098751068115, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776680811.7228274, 'checkpointer_blocking_duration_secs': 0.7717812061309814, 'get_old_steps_start_time': 1776680812.49463, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776680791.917113, 'checkpoint_manager_blocking_duration_secs': 20.57970094680786} I0420 10:26:52.497006 140049080088384 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 10:26:52.497065 140049080088384 checkpoint_manager.py:2020] [process=2][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 10:26:58.121515 139919581050624 array_metadata_store.py:203] [process=2][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_10_shardy_false/checkpoints/9/items/array_metadatas/process_2 I0420 10:27:34.614867 139919095756544 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/gbytes_per_sec: 37.460 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.167065382003784 s) (per-host) I0420 10:27:34.614998 139919095756544 async_checkpointer.py:90] [process=2][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.120422s. I0420 10:27:44.972375 139919095756544 async_checkpointer.py:160] [process=2][thread=async_save] Background save thread done. Time taken: 52.477785s. I0420 10:27:44.972651 139915818022656 async_checkpointer.py:288] [process=2][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 10:27:44.972774 139915818022656 async_checkpointer.py:298] [process=2][thread=save_finalize] No errors found in background save thread=async_save. I0420 10:27:44.972824 139915818022656 checkpoint_manager.py:2137] [process=2][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 10:27:44.974510 139915818022656 checkpoint_manager.py:2146] [process=2][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 10:27:44.974676 140049080088384 checkpoint_manager.py:2032] [process=2][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 10:27:44.974849 140049080088384 checkpoint_manager.py:2009] [process=2][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 10:27:44.975846 140049080088384 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.792, Tokens/s/device: 13835.875, 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 10:27:56 UTC 2026 EXIT_CODE=0