XPK Start: Fri Apr 17 00:55:29 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-17 00:55:53.637394: 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) I0417 00:55:54.170554 134692209981248 max_utils.py:273] Attempting to initialize the jax distributed system... I0417 00:56:03.211513 134692209981248 distributed.py:149] Starting JAX distributed service on [::]:8482 I0417 00:56:03.213840 134692209981248 distributed.py:172] Connecting to JAX distributed service on mt-06-grad-accum-vq30f-slice-job-0-0.mt-06-grad-accum-vq30f:8482 I0417 00:56:04.959321 134692209981248 max_utils.py:284] Jax distributed system initialized! I0417 00:56:11.122408 134692209981248 max_utils.py:800] System Information: Jax Version: 0.9.2 I0417 00:56:11.122529 134692209981248 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0417 00:56:11.122570 134692209981248 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 I0417 00:56:11.122604 134692209981248 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0417 00:56:11.797761 134692209981248 maxtext_utils.py:1687] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0417 00:56:11.912611 134692209981248 checkpointing.py:688] Setting up checkpoint logger... I0417 00:56:11.912720 134692209981248 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0417 00:56:11.912765 134692209981248 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0417 00:56:11.912960 134692209981248 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 0x7a7fc53ae600>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0417 00:56:15.037941 134692209981248 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0417 00:56:15.038174 134692209981248 checkpoint_manager.py:708] [process=1][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a6bac2430e0>}, handler_registry=None I0417 00:56:15.038417 134692209981248 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a6bac2430e0>` 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`. I0417 00:56:15.038477 134692209981248 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a6bbff61280>` 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`. I0417 00:56:15.038513 134692209981248 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 0x7a6bac2430e0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a6bac2430e0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a6bbff61280>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a6bbff61280>}). I0417 00:56:15.038837 134692209981248 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0417 00:56:15.038910 134692209981248 async_checkpointer.py:192] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7a6bbfef9ee0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0417 00:56:16.394750 134692209981248 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints I0417 00:56:16.418427 134692209981248 checkpoint_manager.py:929] [process=1][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_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7a6bac2975f0> I0417 00:56:16.418570 134692209981248 checkpointing.py:302] Checkpoint manager created! I0417 00:56:18.154781 134692209981248 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0417 00:56:18.154899 134692209981248 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0417 00:56:19.517725 134692209981248 maxtext_utils.py:1805] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0417 00:56:19.517840 134692209981248 maxtext_utils.py:1805] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0417 00:56:19.517891 134692209981248 maxtext_utils.py:1805] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0417 00:56:19.517937 134692209981248 maxtext_utils.py:1805] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0417 00:56:19.517976 134692209981248 maxtext_utils.py:1805] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0417 00:56:19.518012 134692209981248 maxtext_utils.py:1805] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0417 00:56:19.518048 134692209981248 maxtext_utils.py:1805] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0417 00:56:19.518085 134692209981248 maxtext_utils.py:1805] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0417 00:56:19.518117 134692209981248 maxtext_utils.py:1805] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0417 00:56:19.518151 134692209981248 maxtext_utils.py:1805] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0417 00:56:19.518184 134692209981248 maxtext_utils.py:1805] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0417 00:56:19.518216 134692209981248 maxtext_utils.py:1805] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0417 00:56:19.905325 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048]............................................... Unknown. I0417 00:56:19.905419 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048]............................................... (None,). I0417 00:56:19.920391 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,7168]....................................... Unknown. I0417 00:56:19.920447 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,7168]....................................... ('fsdp', None, None). I0417 00:56:19.949714 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[7168,16,2048]....................................... Unknown. I0417 00:56:19.949783 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[7168,16,2048]....................................... (None, None, 'fsdp'). I0417 00:56:19.964266 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16]............................................ Unknown. I0417 00:56:19.964319 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16]............................................ (None, None). I0417 00:56:19.993668 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,16,128]..................................... Unknown. I0417 00:56:19.993734 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,16,128]..................................... ('fsdp', None, None, None). I0417 00:56:20.008394 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[16,16,128,2048]..................................... Unknown. I0417 00:56:20.008449 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[16,16,128,2048]..................................... (None, None, None, 'fsdp'). I0417 00:56:20.051882 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,32000]......................................... Unknown. I0417 00:56:20.051955 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,32000]......................................... ('fsdp', None). I0417 00:56:20.066483 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[32000,2048]......................................... Unknown. I0417 00:56:20.066539 134692209981248 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[32000,2048]......................................... (None, 'fsdp'). I0417 00:56:20.285622 134692209981248 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0417 00:56:20.285763 134692209981248 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 00:56:20.292533 134692209981248 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0417 00:56:20.292633 134692209981248 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 00:56:20.309248 134692209981248 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 00:56:20.309397 134692209981248 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 00:56:20.325244 134692209981248 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 00:56:20.325386 134692209981248 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 00:56:20.355399 134692209981248 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 00:56:20.355548 134692209981248 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 00:56:20.371601 134692209981248 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 00:56:20.371733 134692209981248 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 00:56:20.387521 134692209981248 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 00:56:20.387657 134692209981248 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 00:56:20.416281 134692209981248 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0417 00:56:20.416425 134692209981248 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 00:56:20.437880 134692209981248 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0417 00:56:20.437981 134692209981248 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0417 00:56:31.979918 134692209981248 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. I0417 00:56:31.982255 134692209981248 metric_logger.py:289] number parameters: 1.104 billion I0417 00:56:33.607365 134692209981248 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0417 00:56:44.388737 134692209981248 checkpointing.py:798] Waited 10.78135371208191 seconds for step 0 to finish before starting checkpointing. I0417 00:56:44.391211 134692209981248 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 00:56:44.392848 134692209981248 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 0 I0417 00:56:44.394747 134692209981248 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints/0. I0417 00:56:45.127829 134692209981248 signaling_client.py:364] Using JaxDistributedSignalingClient I0417 00:56:45.128861 134692209981248 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0417 00:56:45.128919 134692209981248 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 I0417 00:56:45.403973 134692209981248 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.276930s I0417 00:56:45.404146 134692209981248 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 5.385 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28644514083862305 s) (per-host) I0417 00:56:45.404197 134692209981248 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.286506s (batch_requests_ready=0.002978s, total_serialization_initiated=0.283459s, others=0.000068s) I0417 00:56:45.404293 134692209981248 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.290848s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.290832) I0417 00:56:45.405118 134692209981248 event_tracking.py:125] [process=1] [async] Finished blocking save in 1.01 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints/0. I0417 00:56:45.405399 134564772742912 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 01:16:45.405373 I0417 00:56:45.414237 134692209981248 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0417 00:56:45.414483 134562625259264 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0417 00:56:45.414599 134692209981248 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776387404.391192, 'wait_for_prev_duration_secs': 6.198883056640625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776387404.3928883, 'checkpointer_blocking_duration_secs': 1.0125951766967773, 'get_old_steps_start_time': 1776387405.4055088, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776387404.3891356, 'checkpoint_manager_blocking_duration_secs': 1.0254249572753906} I0417 00:56:45.414712 134692209981248 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0417 00:56:45.414774 134692209981248 max_utils.py:750] Memstats: After params initialized: I0417 00:56:45.414821 134692209981248 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0417 00:56:45.414853 134692209981248 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0417 00:56:45.414880 134692209981248 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0417 00:56:45.414902 134692209981248 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0417 00:56:45.729323 134692209981248 metric_logger.py:185] completed step: 0, seconds: 1.624, TFLOP/s/device: 33.465, Tokens/s/device: 5044.214, total_weights: 262144, loss: 10.876 I0417 00:56:46.330029 134692209981248 metric_logger.py:185] completed step: 1, seconds: 12.120, TFLOP/s/device: 4.484, Tokens/s/device: 675.891, total_weights: 262144, loss: 10.876 I0417 00:56:46.908360 134692209981248 metric_logger.py:185] completed step: 2, seconds: 0.024, TFLOP/s/device: 2286.145, Tokens/s/device: 344592.605, total_weights: 262144, loss: 10.561 I0417 00:56:47.486838 134692209981248 metric_logger.py:185] completed step: 3, seconds: 0.585, TFLOP/s/device: 92.871, Tokens/s/device: 13998.585, total_weights: 262144, loss: 10.270 I0417 00:56:48.644136 134692209981248 metric_logger.py:185] completed step: 4, seconds: 0.578, TFLOP/s/device: 93.986, Tokens/s/device: 14166.638, total_weights: 262144, loss: 10.021 I0417 00:56:48.651345 134692209981248 metric_logger.py:185] completed step: 5, seconds: 0.578, TFLOP/s/device: 94.010, Tokens/s/device: 14170.142, total_weights: 262144, loss: 9.819 I0417 00:56:48.688218 2558 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0417 00:56:51.674148 134563147564800 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints/0/items/array_metadatas/process_1 I0417 00:57:22.229658 134564772742912 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 42.563 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.11191439628601 s) (per-host) I0417 00:57:22.229771 134564772742912 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.823773s. I0417 00:57:32.877238 134564772742912 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 47.471222s. I0417 00:57:32.877472 134562625259264 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 00:57:32.877547 134562625259264 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0417 00:57:32.877599 134562625259264 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0417 00:57:32.880268 134562625259264 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0417 00:57:33.419831 134692209981248 metric_logger.py:185] completed step: 6, seconds: 1.157, TFLOP/s/device: 46.958, Tokens/s/device: 7078.049, total_weights: 262144, loss: 9.666 I0417 00:57:33.998240 134692209981248 metric_logger.py:185] completed step: 7, seconds: 44.192, TFLOP/s/device: 1.230, Tokens/s/device: 185.374, total_weights: 262144, loss: 9.560 I0417 00:57:34.576812 134692209981248 metric_logger.py:185] completed step: 8, seconds: 0.584, TFLOP/s/device: 93.136, Tokens/s/device: 14038.503, total_weights: 262144, loss: 9.495 I0417 00:57:35.158058 134692209981248 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0417 00:57:35.158704 134692209981248 checkpointing.py:798] Waited 0.000659942626953125 seconds for step 9 to finish before starting checkpointing. I0417 00:57:35.160893 134692209981248 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 00:57:35.162693 134692209981248 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 9 I0417 00:57:35.164038 134692209981248 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints/9. I0417 00:57:35.883113 134692209981248 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0417 00:57:35.883208 134692209981248 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 I0417 00:57:35.915743 134692209981248 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034160s I0417 00:57:35.915935 134692209981248 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 37.350 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04130053520202637 s) (per-host) I0417 00:57:35.915992 134692209981248 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.041374s (batch_requests_ready=0.002616s, total_serialization_initiated=0.038674s, others=0.000084s) I0417 00:57:35.916090 134692209981248 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.045591s (all_items=0.000016s, per_item={'items': '0.00001597'}, temp_paths=0.045575) I0417 00:57:35.916746 134692209981248 event_tracking.py:125] [process=1] [async] Finished blocking save in 0.75 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints/9. I0417 00:57:35.917066 134564277049088 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 01:17:35.917027 I0417 00:57:35.927313 134692209981248 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0417 00:57:35.927572 134562625259264 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0417 00:57:35.927706 134692209981248 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776387455.1608596, 'wait_for_prev_duration_secs': 7.367134094238281e-05, 'time_between_consecutive_saves_sec': 2.280545949935913, 'checkpointer_blocking_start_time': 1776387455.1627321, 'checkpointer_blocking_duration_secs': 0.7544815540313721, 'get_old_steps_start_time': 1776387455.917238, 'get_old_steps_duration_secs': 2.8133392333984375e-05, 'checkpoint_manager_blocking_start_time': 1776387455.1589305, 'checkpoint_manager_blocking_duration_secs': 0.7687392234802246} I0417 00:57:35.927824 134692209981248 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0417 00:57:35.927872 134692209981248 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 00:57:43.146511 134565309949696 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_003418/nnx_xpk_feat_nnx_post_train_fixes_20260417_003418_06_grad_accum/checkpoints/9/items/array_metadatas/process_1 I0417 00:58:18.626366 134564277049088 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 36.948 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.75170016288757 s) (per-host) I0417 00:58:18.626506 134564277049088 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.709326s. I0417 00:58:26.358683 134564277049088 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 50.441476s. I0417 00:58:26.358977 134562625259264 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 00:58:26.359099 134562625259264 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0417 00:58:26.359146 134562625259264 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0417 00:58:26.360857 134562625259264 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0417 00:58:26.361023 134692209981248 checkpoint_manager.py:2032] [process=1][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0417 00:58:26.361208 134692209981248 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 00:58:26.361865 134692209981248 metric_logger.py:185] completed step: 9, seconds: 0.579, TFLOP/s/device: 93.891, Tokens/s/device: 14152.321, total_weights: 262144, loss: 9.457 Per train step: Total TFLOPs: 54.35 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Fri Apr 17 00:58:34 UTC 2026 EXIT_CODE=0