XPK Start: Tue Apr 21 10:40:37 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-21 10:41:01.757871: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0421 10:41:01.936627 136420091217728 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 10:41:10.977805 136420091217728 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 10:41:10.980168 136420091217728 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-false-cqoyk-slice-job-0-0.mt-10-shardy-false-cqoyk:8482 I0421 10:41:12.425810 136420091217728 max_utils.py:284] Jax distributed system initialized! I0421 10:41:17.627281 136420091217728 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 10:41:17.627382 136420091217728 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 10:41:17.627423 136420091217728 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365 I0421 10:41:17.627457 136420091217728 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 10:41:18.681616 136420091217728 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 10:41:18.795205 136420091217728 checkpointing.py:688] Setting up checkpoint logger... I0421 10:41:18.795321 136420091217728 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 10:41:18.795368 136420091217728 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 10:41:18.795566 136420091217728 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 0x7c122b918200>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 10:41:21.337765 136420091217728 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 10:41:21.337947 136420091217728 checkpoint_manager.py:708] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7c1103656e70>}, handler_registry=None I0421 10:41:21.338180 136420091217728 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7c1103656e70>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0421 10:41:21.338228 136420091217728 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c1103870d70>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0421 10:41:21.338269 136420091217728 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 0x7c1103656e70>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7c1103656e70>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c1103870d70>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c1103870d70>}). I0421 10:41:21.338599 136420091217728 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 10:41:21.338668 136420091217728 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7bfe88128fe0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 10:41:22.320294 136420091217728 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints I0421 10:41:22.557405 136420091217728 checkpoint_manager.py:929] [process=4][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7c11038f57f0> I0421 10:41:22.557574 136420091217728 checkpointing.py:302] Checkpoint manager created! I0421 10:41:23.534723 136420091217728 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 10:41:23.534837 136420091217728 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 10:41:25.267179 136420091217728 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 10:41:25.267270 136420091217728 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 10:41:25.272861 136420091217728 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 10:41:25.272917 136420091217728 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 10:41:25.289056 136420091217728 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 10:41:25.289114 136420091217728 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 10:41:25.310369 136420091217728 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 10:41:25.310470 136420091217728 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 10:41:25.335891 136420091217728 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 10:41:25.335957 136420091217728 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 10:41:25.351818 136420091217728 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 10:41:25.351879 136420091217728 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 10:41:25.367526 136420091217728 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 10:41:25.367590 136420091217728 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 10:41:25.397547 136420091217728 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 10:41:25.397618 136420091217728 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 10:41:25.417448 136420091217728 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 10:41:25.417515 136420091217728 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 10:41:36.519089 136420091217728 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 10:41:36.521455 136420091217728 metric_logger.py:301] number parameters: 1.104 billion I0421 10:41:47.367779 136420091217728 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 10:41:47.722968 136420091217728 checkpointing.py:798] Waited 0.3551754951477051 seconds for step 0 to finish before starting checkpointing. I0421 10:41:47.725910 136420091217728 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 10:41:47.727684 136420091217728 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 0 I0421 10:41:47.729068 136420091217728 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints/0. I0421 10:41:48.019659 136420091217728 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 10:41:48.020540 136420091217728 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 10:41:48.020598 136420091217728 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0421 10:41:48.291537 136420091217728 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.272637s I0421 10:41:48.291721 136420091217728 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 5.473 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.281848669052124 s) (per-host) I0421 10:41:48.291772 136420091217728 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.281922s (batch_requests_ready=0.003110s, total_serialization_initiated=0.278731s, others=0.000081s) I0421 10:41:48.291867 136420091217728 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.285878s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.285860) I0421 10:41:48.292590 136420091217728 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.56 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints/0. I0421 10:41:48.292936 136292331419392 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 11:01:48.292899 I0421 10:41:48.305042 136420091217728 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 10:41:48.305316 136289601230592 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 10:41:48.305443 136420091217728 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776768107.7258909, 'wait_for_prev_duration_secs': 6.103515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776768107.727737, 'checkpointer_blocking_duration_secs': 0.5653526782989502, 'get_old_steps_start_time': 1776768108.2931144, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776768107.7233613, 'checkpoint_manager_blocking_duration_secs': 0.582042932510376} I0421 10:41:48.305566 136420091217728 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 10:41:48.305636 136420091217728 max_utils.py:750] Memstats: After params initialized: I0421 10:41:48.305685 136420091217728 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0)) I0421 10:41:48.305731 136420091217728 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0)) I0421 10:41:48.305760 136420091217728 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0)) I0421 10:41:48.305785 136420091217728 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0)) I0421 10:41:48.630190 136420091217728 metric_logger.py:196] completed step: 0, seconds: 10.845, TFLOP/s/device: 1.253, Tokens/s/device: 188.839, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0421 10:41:48.802960 136420091217728 metric_logger.py:196] completed step: 1, seconds: 1.260, TFLOP/s/device: 10.779, Tokens/s/device: 1624.779, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0421 10:41:49.218490 136420091217728 metric_logger.py:196] completed step: 2, seconds: 0.028, TFLOP/s/device: 491.664, Tokens/s/device: 74108.920, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0421 10:41:49.366020 136420091217728 metric_logger.py:196] completed step: 3, seconds: 0.404, TFLOP/s/device: 33.596, Tokens/s/device: 5063.992, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0421 10:41:49.661553 136420091217728 metric_logger.py:196] completed step: 4, seconds: 0.164, TFLOP/s/device: 82.814, Tokens/s/device: 12482.553, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0421 10:41:49.668843 136420091217728 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.286, Tokens/s/device: 13910.303, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0421 10:41:51.666062 2814 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 10:41:53.705141 136289647064832 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints/0/items/array_metadatas/process_4 I0421 10:42:12.177398 136420091217728 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.878, Tokens/s/device: 6915.158, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0421 10:42:12.324959 136420091217728 metric_logger.py:196] completed step: 7, seconds: 22.362, TFLOP/s/device: 0.608, Tokens/s/device: 91.583, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0421 10:42:12.472474 136420091217728 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.774, Tokens/s/device: 13380.986, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0421 10:42:12.620648 136420091217728 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 10:42:12.621322 136420091217728 checkpointing.py:798] Waited 0.0006880760192871094 seconds for step 9 to finish before starting checkpointing. I0421 10:42:12.623383 136420091217728 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 10:42:24.903038 136292331419392 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 42.815 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.89314007759094 s) (per-host) I0421 10:42:24.903162 136292331419392 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.610115s. I0421 10:42:34.478000 136292331419392 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 46.184935s. I0421 10:42:34.478211 136289601230592 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 10:42:34.478277 136289601230592 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 10:42:34.478327 136289601230592 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 10:42:34.480809 136289601230592 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 10:42:34.480975 136420091217728 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0421 10:42:34.481119 136420091217728 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.857737 seconds. If this number is high, consider checkpointing less frequently. I0421 10:42:34.483047 136420091217728 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 9 I0421 10:42:34.485190 136420091217728 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints/9. I0421 10:42:35.196160 136420091217728 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 10:42:35.196258 136420091217728 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0421 10:42:35.232572 136420091217728 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.037956s I0421 10:42:35.232752 136420091217728 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 34.026 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04533576965332031 s) (per-host) I0421 10:42:35.232804 136420091217728 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045397s (batch_requests_ready=0.002856s, total_serialization_initiated=0.042473s, others=0.000069s) I0421 10:42:35.232899 136420091217728 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.049461s (all_items=0.000016s, per_item={'items': '0.00001597'}, temp_paths=0.049445) I0421 10:42:35.233594 136420091217728 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.75 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints/9. I0421 10:42:35.233878 136289601230592 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 11:02:35.233858 I0421 10:42:35.242505 136420091217728 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 10:42:35.242764 136292306241280 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 10:42:35.242929 136420091217728 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776768132.6233535, 'wait_for_prev_duration_secs': 21.857737064361572, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776768154.4830854, 'checkpointer_blocking_duration_secs': 0.7508847713470459, 'get_old_steps_start_time': 1776768155.2339935, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776768132.621557, 'checkpoint_manager_blocking_duration_secs': 22.621336460113525} I0421 10:42:35.243043 136420091217728 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 10:42:35.243089 136420091217728 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 10:42:40.749239 136266477688576 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238/nnx_xpk_feat_nnx_trainstate_and_training_loop_20260421_083238_10_shardy_false/checkpoints/9/items/array_metadatas/process_4 I0421 10:43:17.480571 136289601230592 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.349 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.293107748031616 s) (per-host) I0421 10:43:17.480729 136289601230592 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.246780s. I0421 10:43:26.723510 136289601230592 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 51.489545s. I0421 10:43:26.723831 136292306241280 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 10:43:26.723955 136292306241280 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 10:43:26.724005 136292306241280 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 10:43:26.725436 136292306241280 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 10:43:26.725616 136420091217728 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0421 10:43:26.725804 136420091217728 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 10:43:26.726664 136420091217728 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.771, Tokens/s/device: 13832.791, 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 10:43:38 UTC 2026 EXIT_CODE=0