XPK Start: Tue Apr 21 17:31:49 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 17:32:13.438949: 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 17:32:13.974816 138723698825024 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 17:32:23.015020 138723698825024 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 17:32:23.017452 138723698825024 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-false-73j43-slice-job-0-0.mt-10-shardy-false-73j43:8482 I0421 17:32:23.830443 138723698825024 max_utils.py:284] Jax distributed system initialized! I0421 17:32:28.906197 138723698825024 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 17:32:28.906298 138723698825024 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 17:32:28.906338 138723698825024 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 17:32:28.906374 138723698825024 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 17:32:29.598184 138723698825024 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 17:32:29.710774 138723698825024 checkpointing.py:688] Setting up checkpoint logger... I0421 17:32:29.710885 138723698825024 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 17:32:29.710943 138723698825024 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 17:32:29.711136 138723698825024 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 0x7e2a690501a0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 17:32:32.763854 138723698825024 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 17:32:32.764063 138723698825024 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 0x7e16cc52b050>}, handler_registry=None I0421 17:32:32.764306 138723698825024 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e16cc52b050>` 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 17:32:32.764353 138723698825024 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e16cc5ea5d0>` 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 17:32:32.764388 138723698825024 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 0x7e16cc52b050>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e16cc52b050>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e16cc5ea5d0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e16cc5ea5d0>}). I0421 17:32:32.764706 138723698825024 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 17:32:32.764778 138723698825024 async_checkpointer.py:192] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e16ec2d5760> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 17:32:33.770039 138723698825024 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_false/checkpoints I0421 17:32:34.237922 138723698825024 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_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e16cc528440> I0421 17:32:34.238120 138723698825024 checkpointing.py:302] Checkpoint manager created! I0421 17:32:35.198685 138723698825024 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 17:32:35.198806 138723698825024 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 17:32:36.987915 138723698825024 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 17:32:36.988025 138723698825024 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 17:32:36.993645 138723698825024 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 17:32:36.993707 138723698825024 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 17:32:37.009962 138723698825024 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 17:32:37.010023 138723698825024 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 17:32:37.025563 138723698825024 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 17:32:37.025624 138723698825024 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 17:32:37.049767 138723698825024 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 17:32:37.049837 138723698825024 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 17:32:37.065697 138723698825024 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 17:32:37.065767 138723698825024 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 17:32:37.081444 138723698825024 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 17:32:37.081519 138723698825024 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 17:32:37.111467 138723698825024 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 17:32:37.111541 138723698825024 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 17:32:37.131344 138723698825024 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 17:32:37.131406 138723698825024 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 17:32:48.467852 138723698825024 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 17:32:48.470258 138723698825024 metric_logger.py:301] number parameters: 1.104 billion I0421 17:32:59.665551 138723698825024 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 17:32:59.817643 138723698825024 checkpointing.py:798] Waited 0.15208196640014648 seconds for step 0 to finish before starting checkpointing. I0421 17:32:59.820004 138723698825024 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 17:32:59.821797 138723698825024 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 0 I0421 17:32:59.823486 138723698825024 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_false/checkpoints/0. I0421 17:33:00.574239 138723698825024 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 17:33:00.575241 138723698825024 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 17:33:00.575300 138723698825024 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 17:33:00.856106 138723698825024 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.282665s I0421 17:33:00.856265 138723698825024 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 5.288 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29171299934387207 s) (per-host) I0421 17:33:00.856315 138723698825024 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.291773s (batch_requests_ready=0.002997s, total_serialization_initiated=0.288709s, others=0.000067s) I0421 17:33:00.856410 138723698825024 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.295864s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.295847) I0421 17:33:00.857275 138723698825024 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_false/checkpoints/0. I0421 17:33:00.857623 138598016292608 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:53:00.857585 I0421 17:33:00.864732 138723698825024 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 17:33:00.865023 138595863013120 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0421 17:33:00.865177 138723698825024 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_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776792779.8199859, 'wait_for_prev_duration_secs': 5.9604644775390625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776792779.8218358, 'checkpointer_blocking_duration_secs': 1.0359416007995605, 'get_old_steps_start_time': 1776792780.8578036, 'get_old_steps_duration_secs': 2.9325485229492188e-05, 'checkpoint_manager_blocking_start_time': 1776792779.818059, 'checkpoint_manager_blocking_duration_secs': 1.047081470489502} I0421 17:33:00.865285 138723698825024 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 17:33:00.865355 138723698825024 max_utils.py:750] Memstats: After params initialized: I0421 17:33:00.865406 138723698825024 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0)) I0421 17:33:00.865442 138723698825024 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0)) I0421 17:33:00.865467 138723698825024 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0)) I0421 17:33:00.865490 138723698825024 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0)) I0421 17:33:01.183250 138723698825024 metric_logger.py:196] completed step: 0, seconds: 11.194, TFLOP/s/device: 1.214, Tokens/s/device: 182.951, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0421 17:33:01.360944 138723698825024 metric_logger.py:196] completed step: 1, seconds: 1.516, TFLOP/s/device: 8.964, Tokens/s/device: 1351.145, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0421 17:33:01.820730 138723698825024 metric_logger.py:196] completed step: 2, seconds: 0.032, TFLOP/s/device: 430.695, Tokens/s/device: 64919.010, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0421 17:33:01.968322 138723698825024 metric_logger.py:196] completed step: 3, seconds: 0.449, TFLOP/s/device: 30.237, Tokens/s/device: 4557.644, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0421 17:33:02.264662 138723698825024 metric_logger.py:196] completed step: 4, seconds: 0.165, TFLOP/s/device: 82.486, Tokens/s/device: 12433.145, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0421 17:33:02.272383 138723698825024 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.192, Tokens/s/device: 13896.240, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0421 17:33:08.833960 2762 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 17:33:10.876885 138595871405824 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_false/checkpoints/0/items/array_metadatas/process_3 I0421 17:33:24.708797 138723698825024 metric_logger.py:196] completed step: 6, seconds: 0.297, TFLOP/s/device: 45.769, Tokens/s/device: 6898.805, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0421 17:33:24.856262 138723698825024 metric_logger.py:196] completed step: 7, seconds: 22.290, TFLOP/s/device: 0.610, Tokens/s/device: 91.879, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0421 17:33:25.003703 138723698825024 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.585, Tokens/s/device: 13352.545, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0421 17:33:25.151940 138723698825024 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 17:33:25.152938 138723698825024 checkpointing.py:798] Waited 0.0009777545928955078 seconds for step 9 to finish before starting checkpointing. I0421 17:33:25.155062 138723698825024 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 17:33:42.696264 138598016292608 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 37.492 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.131671667099 s) (per-host) I0421 17:33:42.696383 138598016292608 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.838645s. I0421 17:33:51.217772 138598016292608 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 50.360017s. I0421 17:33:51.218077 138595863013120 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 17:33:51.218192 138595863013120 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0421 17:33:51.218250 138595863013120 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 17:33:51.220484 138595863013120 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 17:33:51.220670 138723698825024 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 17:33:51.220813 138723698825024 checkpoint_manager.py:1452] Waiting for previous save to complete took 26.065754 seconds. If this number is high, consider checkpointing less frequently. I0421 17:33:51.222558 138723698825024 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 9 I0421 17:33:51.224642 138723698825024 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_false/checkpoints/9. I0421 17:33:51.921035 138723698825024 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 17:33:51.921129 138723698825024 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 17:33:51.957314 138723698825024 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.037975s I0421 17:33:51.957449 138723698825024 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 34.274 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04500699043273926 s) (per-host) I0421 17:33:51.957497 138723698825024 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045063s (batch_requests_ready=0.002681s, total_serialization_initiated=0.042319s, others=0.000062s) I0421 17:33:51.957579 138723698825024 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.049202s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.049187) I0421 17:33:51.958213 138723698825024 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.74 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_false/checkpoints/9. I0421 17:33:51.958544 138595863013120 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:53:51.958507 I0421 17:33:51.960528 138723698825024 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 17:33:51.960747 138595871405824 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0421 17:33:51.960862 138723698825024 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_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776792805.1550305, 'wait_for_prev_duration_secs': 26.065753936767578, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776792831.2225964, 'checkpointer_blocking_duration_secs': 0.7360846996307373, 'get_old_steps_start_time': 1776792831.9587033, 'get_old_steps_duration_secs': 2.9087066650390625e-05, 'checkpoint_manager_blocking_start_time': 1776792805.1533177, 'checkpoint_manager_blocking_duration_secs': 26.80750846862793} I0421 17:33:51.960996 138723698825024 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 17:33:51.961044 138723698825024 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 17:33:57.933834 138591577560832 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_false/checkpoints/9/items/array_metadatas/process_3 I0421 17:34:34.686571 138595863013120 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 36.929 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.77408695220947 s) (per-host) I0421 17:34:34.686707 138595863013120 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.728048s. I0421 17:34:41.788045 138595863013120 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 49.829375s. I0421 17:34:41.788266 138595871405824 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 17:34:41.788323 138595871405824 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0421 17:34:41.788380 138595871405824 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 17:34:41.792008 138595871405824 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 17:34:41.792188 138723698825024 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 17:34:41.792358 138723698825024 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 17:34:41.793200 138723698825024 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.609, Tokens/s/device: 13808.355, 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 17:34:50 UTC 2026 EXIT_CODE=0