XPK Start: Tue Apr 21 16:54:00 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 16:54:24.997628: 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 16:54:25.178283 133205924251456 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 16:54:34.219110 133205924251456 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 16:54:34.221543 133205924251456 distributed.py:172] Connecting to JAX distributed service on mt-06-grad-accum-lwd7r-slice-job-0-0.mt-06-grad-accum-lwd7r:8482 I0421 16:54:34.790647 133205924251456 max_utils.py:284] Jax distributed system initialized! I0421 16:54:40.802069 133205924251456 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 16:54:40.802171 133205924251456 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 16:54:40.802210 133205924251456 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 16:54:40.802244 133205924251456 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 16:54:41.507633 133205924251456 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 16:54:41.620842 133205924251456 checkpointing.py:688] Setting up checkpoint logger... I0421 16:54:41.620966 133205924251456 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 16:54:41.621013 133205924251456 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 16:54:41.621212 133205924251456 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 0x7925b41480b0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 16:54:44.438478 133205924251456 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 16:54:44.438669 133205924251456 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 0x7911286e49e0>}, handler_registry=None I0421 16:54:44.438915 133205924251456 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7911286e49e0>` 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 16:54:44.438977 133205924251456 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7911603a38f0>` 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 16:54:44.439013 133205924251456 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 0x7911286e49e0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7911286e49e0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7911603a38f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7911603a38f0>}). I0421 16:54:44.439328 133205924251456 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 16:54:44.439400 133205924251456 async_checkpointer.py:192] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x791140449b20> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 16:54:45.648288 133205924251456 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_06_grad_accum/checkpoints I0421 16:54:46.095397 133205924251456 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_06_grad_accum/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7911600b5700> I0421 16:54:46.095569 133205924251456 checkpointing.py:302] Checkpoint manager created! I0421 16:54:47.860335 133205924251456 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 16:54:47.860455 133205924251456 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 16:54:49.607306 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048]............................................... Unknown. I0421 16:54:49.607403 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048]............................................... (None,). I0421 16:54:49.622230 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,7168]....................................... Unknown. I0421 16:54:49.622288 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,7168]....................................... ('fsdp', None, None). I0421 16:54:49.651725 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[7168,16,2048]....................................... Unknown. I0421 16:54:49.651796 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[7168,16,2048]....................................... (None, None, 'fsdp'). I0421 16:54:49.666493 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16]............................................ Unknown. I0421 16:54:49.666552 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16]............................................ (None, None). I0421 16:54:49.695906 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,16,128]..................................... Unknown. I0421 16:54:49.695980 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,16,128]..................................... ('fsdp', None, None, None). I0421 16:54:49.710686 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[16,16,128,2048]..................................... Unknown. I0421 16:54:49.710744 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[16,16,128,2048]..................................... (None, None, None, 'fsdp'). I0421 16:54:49.754726 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,32000]......................................... Unknown. I0421 16:54:49.754800 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,32000]......................................... ('fsdp', None). I0421 16:54:49.769602 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[32000,2048]......................................... Unknown. I0421 16:54:49.769658 133205924251456 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[32000,2048]......................................... (None, 'fsdp'). I0421 16:54:49.989861 133205924251456 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 16:54:49.990038 133205924251456 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 16:54:49.996485 133205924251456 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 16:54:49.996602 133205924251456 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 16:54:50.013249 133205924251456 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 16:54:50.013399 133205924251456 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 16:54:50.029735 133205924251456 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 16:54:50.029868 133205924251456 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 16:54:50.060337 133205924251456 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 16:54:50.060481 133205924251456 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 16:54:50.076600 133205924251456 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 16:54:50.076736 133205924251456 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 16:54:50.092729 133205924251456 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 16:54:50.092867 133205924251456 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 16:54:50.121502 133205924251456 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 16:54:50.121661 133205924251456 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 16:54:50.143123 133205924251456 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 16:54:50.143279 133205924251456 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 16:55:01.797630 133205924251456 max_utils.py:791] Total memory size: 1.7 GB, Output size: 0.4 GB, Temp size: 1.3 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0421 16:55:01.800127 133205924251456 metric_logger.py:301] number parameters: 1.104 billion I0421 16:55:03.435738 133205924251456 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 16:55:14.486077 133205924251456 checkpointing.py:798] Waited 11.050329446792603 seconds for step 0 to finish before starting checkpointing. I0421 16:55:14.488905 133205924251456 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 16:55:14.492050 133205924251456 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 0 I0421 16:55:14.493945 133205924251456 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_06_grad_accum/checkpoints/0. I0421 16:55:14.850066 133205924251456 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 16:55:14.851075 133205924251456 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 16:55:14.851131 133205924251456 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 16:55:15.127826 133205924251456 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.278534s I0421 16:55:15.128016 133205924251456 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 5.359 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2878739833831787 s) (per-host) I0421 16:55:15.128068 133205924251456 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.287937s (batch_requests_ready=0.003235s, total_serialization_initiated=0.284631s, others=0.000071s) I0421 16:55:15.128163 133205924251456 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.292061s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.292043) I0421 16:55:15.129006 133205924251456 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.64 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_06_grad_accum/checkpoints/0. I0421 16:55:15.129305 133076852131584 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:15:15.129272 I0421 16:55:15.140459 133205924251456 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 16:55:15.140768 133076825831168 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0421 16:55:15.140938 133205924251456 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_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776790514.4888844, 'wait_for_prev_duration_secs': 8.0108642578125e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776790514.4921353, 'checkpointer_blocking_duration_secs': 0.6373188495635986, 'get_old_steps_start_time': 1776790515.1294804, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776790514.486472, 'checkpoint_manager_blocking_duration_secs': 0.6544156074523926} I0421 16:55:15.141049 133205924251456 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 16:55:15.141117 133205924251456 max_utils.py:750] Memstats: After params initialized: I0421 16:55:15.141168 133205924251456 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0)) I0421 16:55:15.141200 133205924251456 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0)) I0421 16:55:15.141226 133205924251456 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0)) I0421 16:55:15.141249 133205924251456 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0)) I0421 16:55:15.458211 133205924251456 metric_logger.py:196] completed step: 0, seconds: 1.634, TFLOP/s/device: 33.251, Tokens/s/device: 5011.985, total_weights: 262144, loss: 10.876, lm_loss: 10.876, perplexity: 52883.598 I0421 16:55:16.055167 133205924251456 metric_logger.py:196] completed step: 1, seconds: 12.021, TFLOP/s/device: 4.521, Tokens/s/device: 681.492, total_weights: 262144, loss: 10.876, lm_loss: 10.876, perplexity: 52883.598 I0421 16:55:16.633638 133205924251456 metric_logger.py:196] completed step: 2, seconds: 0.020, TFLOP/s/device: 2785.389, Tokens/s/device: 419844.198, total_weights: 262144, loss: 10.561, lm_loss: 10.561, perplexity: 38601.980 I0421 16:55:17.212092 133205924251456 metric_logger.py:196] completed step: 3, seconds: 0.585, TFLOP/s/device: 92.913, Tokens/s/device: 14004.855, total_weights: 262144, loss: 10.270, lm_loss: 10.270, perplexity: 28865.557 I0421 16:55:18.115611 2594 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 16:55:18.369371 133205924251456 metric_logger.py:196] completed step: 4, seconds: 0.579, TFLOP/s/device: 93.889, Tokens/s/device: 14152.027, total_weights: 262144, loss: 10.021, lm_loss: 10.021, perplexity: 22497.775 I0421 16:55:18.377435 133205924251456 metric_logger.py:196] completed step: 5, seconds: 0.578, TFLOP/s/device: 93.973, Tokens/s/device: 14164.678, total_weights: 262144, loss: 9.819, lm_loss: 9.819, perplexity: 18383.324 I0421 16:55:20.120468 133076834223872 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_06_grad_accum/checkpoints/0/items/array_metadatas/process_3 I0421 16:55:52.602653 133076852131584 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 41.830 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.76247310638428 s) (per-host) I0421 16:55:52.602780 133076852131584 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.473362s. I0421 16:56:01.096623 133076852131584 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 45.967189s. I0421 16:56:01.096915 133076825831168 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 16:56:01.097074 133076825831168 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0421 16:56:01.097127 133076825831168 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 16:56:01.099400 133076825831168 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 16:56:03.853772 133205924251456 metric_logger.py:196] completed step: 6, seconds: 1.158, TFLOP/s/device: 46.933, Tokens/s/device: 7074.327, total_weights: 262144, loss: 9.666, lm_loss: 9.666, perplexity: 15775.117 I0421 16:56:04.432047 133205924251456 metric_logger.py:196] completed step: 7, seconds: 44.900, TFLOP/s/device: 1.210, Tokens/s/device: 182.452, total_weights: 262144, loss: 9.560, lm_loss: 9.560, perplexity: 14192.143 I0421 16:56:05.010400 133205924251456 metric_logger.py:196] completed step: 8, seconds: 0.584, TFLOP/s/device: 93.015, Tokens/s/device: 14020.267, total_weights: 262144, loss: 9.495, lm_loss: 9.495, perplexity: 13292.714 I0421 16:56:05.589463 133205924251456 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 16:56:05.590131 133205924251456 checkpointing.py:798] Waited 0.0006806850433349609 seconds for step 9 to finish before starting checkpointing. I0421 16:56:05.592121 133205924251456 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 16:56:05.593837 133205924251456 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 9 I0421 16:56:05.595110 133205924251456 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_06_grad_accum/checkpoints/9. I0421 16:56:05.886954 133205924251456 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0421 16:56:05.887047 133205924251456 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 16:56:05.921726 133205924251456 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036373s I0421 16:56:05.921897 133205924251456 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 35.624 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.043302059173583984 s) (per-host) I0421 16:56:05.921965 133205924251456 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.043380s (batch_requests_ready=0.002570s, total_serialization_initiated=0.040726s, others=0.000083s) I0421 16:56:05.922070 133205924251456 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.047530s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.047514) I0421 16:56:05.922811 133205924251456 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.33 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_06_grad_accum/checkpoints/9. I0421 16:56:05.923181 133081130313472 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:16:05.923144 I0421 16:56:05.928002 133205924251456 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 16:56:05.928283 133076831979264 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0421 16:56:05.928445 133205924251456 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_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776790565.592089, 'wait_for_prev_duration_secs': 7.176399230957031e-05, 'time_between_consecutive_saves_sec': 4.492645740509033, 'checkpointer_blocking_start_time': 1776790565.593877, 'checkpointer_blocking_duration_secs': 0.3294532299041748, 'get_old_steps_start_time': 1776790565.923354, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776790565.5903616, 'checkpoint_manager_blocking_duration_secs': 0.33804798126220703} I0421 16:56:05.928555 133205924251456 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 16:56:05.928597 133205924251456 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 16:56:10.796470 133070434858752 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_06_grad_accum/checkpoints/9/items/array_metadatas/process_3 I0421 16:56:47.862518 133081130313472 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 37.624 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.98389291763306 s) (per-host) I0421 16:56:47.862628 133081130313472 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.939334s. I0421 16:56:56.587364 133081130313472 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 50.664052s. I0421 16:56:56.587681 133076831979264 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 16:56:56.587830 133076831979264 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0421 16:56:56.587878 133076831979264 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 16:56:56.590181 133076831979264 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 16:56:56.590369 133205924251456 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 16:56:56.590572 133205924251456 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 16:56:56.591421 133205924251456 metric_logger.py:196] completed step: 9, seconds: 0.578, TFLOP/s/device: 94.037, Tokens/s/device: 14174.335, total_weights: 262144, loss: 9.457, lm_loss: 9.457, perplexity: 12793.173 Per train step: Total TFLOPs: 54.35 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 16:57:06 UTC 2026 EXIT_CODE=0