XPK Start: Sun Apr 19 01:35:14 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-19 01:35:38.158676: 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) I0419 01:35:38.337937 132579761297216 max_utils.py:273] Attempting to initialize the jax distributed system... I0419 01:35:47.378231 132579761297216 distributed.py:149] Starting JAX distributed service on [::]:8482 I0419 01:35:47.380560 132579761297216 distributed.py:172] Connecting to JAX distributed service on mt-06-grad-accum-zfxjy-slice-job-0-0.mt-06-grad-accum-zfxjy:8482 I0419 01:35:49.327006 132579761297216 max_utils.py:284] Jax distributed system initialized! I0419 01:35:54.775451 132579761297216 max_utils.py:800] System Information: Jax Version: 0.9.2 I0419 01:35:54.775553 132579761297216 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0419 01:35:54.775593 132579761297216 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 I0419 01:35:54.775626 132579761297216 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0419 01:35:55.831372 132579761297216 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0419 01:35:55.944697 132579761297216 checkpointing.py:688] Setting up checkpoint logger... I0419 01:35:55.944809 132579761297216 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0419 01:35:55.944853 132579761297216 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0419 01:35:55.945055 132579761297216 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 0x7893e9c4c6e0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0419 01:35:58.366803 132579761297216 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0419 01:35:58.367045 132579761297216 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 0x7892de1dcf50>}, handler_registry=None I0419 01:35:58.367302 132579761297216 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7892de1dcf50>` 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`. I0419 01:35:58.367352 132579761297216 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7880440e8ef0>` 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`. I0419 01:35:58.367388 132579761297216 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 0x7892de1dcf50>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7892de1dcf50>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7880440e8ef0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7880440e8ef0>}). I0419 01:35:58.367702 132579761297216 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0419 01:35:58.367774 132579761297216 async_checkpointer.py:192] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x787f7c6f04a0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0419 01:36:00.151555 132579761297216 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints I0419 01:36:00.644862 132579761297216 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7892de0a5190> I0419 01:36:00.645050 132579761297216 checkpointing.py:302] Checkpoint manager created! I0419 01:36:02.413364 132579761297216 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0419 01:36:02.413478 132579761297216 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0419 01:36:03.817657 132579761297216 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0419 01:36:03.817775 132579761297216 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0419 01:36:03.817826 132579761297216 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0419 01:36:03.817867 132579761297216 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0419 01:36:03.817904 132579761297216 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0419 01:36:03.817938 132579761297216 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0419 01:36:03.817974 132579761297216 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 01:36:03.818010 132579761297216 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0419 01:36:03.818049 132579761297216 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 01:36:03.818083 132579761297216 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 01:36:03.818115 132579761297216 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0419 01:36:03.818147 132579761297216 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0419 01:36:04.204291 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048]............................................... Unknown. I0419 01:36:04.204383 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048]............................................... (None,). I0419 01:36:04.219369 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,7168]....................................... Unknown. I0419 01:36:04.219429 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,7168]....................................... ('fsdp', None, None). I0419 01:36:04.249075 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[7168,16,2048]....................................... Unknown. I0419 01:36:04.249141 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[7168,16,2048]....................................... (None, None, 'fsdp'). I0419 01:36:04.263988 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16]............................................ Unknown. I0419 01:36:04.264046 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16]............................................ (None, None). I0419 01:36:04.293681 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,16,128]..................................... Unknown. I0419 01:36:04.293745 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,16,128]..................................... ('fsdp', None, None, None). I0419 01:36:04.308605 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[16,16,128,2048]..................................... Unknown. I0419 01:36:04.308661 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[16,16,128,2048]..................................... (None, None, None, 'fsdp'). I0419 01:36:04.353077 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,32000]......................................... Unknown. I0419 01:36:04.353154 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,32000]......................................... ('fsdp', None). I0419 01:36:04.368029 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[32000,2048]......................................... Unknown. I0419 01:36:04.368085 132579761297216 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[32000,2048]......................................... (None, 'fsdp'). I0419 01:36:04.594750 132579761297216 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 01:36:04.594907 132579761297216 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 01:36:04.601867 132579761297216 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 01:36:04.601968 132579761297216 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 01:36:04.618757 132579761297216 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 01:36:04.618882 132579761297216 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 01:36:04.635105 132579761297216 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 01:36:04.635246 132579761297216 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 01:36:04.665695 132579761297216 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:36:04.665843 132579761297216 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 01:36:04.682052 132579761297216 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:36:04.682193 132579761297216 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 01:36:04.698335 132579761297216 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:36:04.698464 132579761297216 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 01:36:04.726675 132579761297216 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0419 01:36:04.726810 132579761297216 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 01:36:04.749455 132579761297216 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0419 01:36:04.749562 132579761297216 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0419 01:36:16.337256 132579761297216 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. I0419 01:36:16.339586 132579761297216 metric_logger.py:301] number parameters: 1.104 billion I0419 01:36:18.049027 132579761297216 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0419 01:36:28.666264 132579761297216 checkpointing.py:798] Waited 10.617221355438232 seconds for step 0 to finish before starting checkpointing. I0419 01:36:28.668558 132579761297216 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 01:36:28.670461 132579761297216 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 0 I0419 01:36:28.671870 132579761297216 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints/0. I0419 01:36:29.413968 132579761297216 signaling_client.py:364] Using JaxDistributedSignalingClient I0419 01:36:29.415005 132579761297216 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0419 01:36:29.415064 132579761297216 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 I0419 01:36:29.687512 132579761297216 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.274324s I0419 01:36:29.687685 132579761297216 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 5.442 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28344249725341797 s) (per-host) I0419 01:36:29.687762 132579761297216 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.283528s (batch_requests_ready=0.003023s, total_serialization_initiated=0.280412s, others=0.000093s) I0419 01:36:29.687897 132579761297216 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.287684s (all_items=0.000017s, per_item={'items': '0.00001740'}, temp_paths=0.287666) I0419 01:36:29.688694 132579761297216 event_tracking.py:125] [process=1] [async] Finished blocking save in 1.02 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints/0. I0419 01:36:29.689036 132454224484096 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 01:56:29.688998 I0419 01:36:29.701727 132579761297216 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0419 01:36:29.702026 132451505968896 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0419 01:36:29.702195 132579761297216 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776562588.6685407, 'wait_for_prev_duration_secs': 5.984306335449219e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776562588.6705015, 'checkpointer_blocking_duration_secs': 1.0186357498168945, 'get_old_steps_start_time': 1776562589.689161, 'get_old_steps_duration_secs': 5.0067901611328125e-05, 'checkpoint_manager_blocking_start_time': 1776562588.6666481, 'checkpoint_manager_blocking_duration_secs': 1.0354976654052734} I0419 01:36:29.702305 132579761297216 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0419 01:36:29.702368 132579761297216 max_utils.py:750] Memstats: After params initialized: I0419 01:36:29.702415 132579761297216 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0419 01:36:29.702448 132579761297216 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0419 01:36:29.702474 132579761297216 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0419 01:36:29.702498 132579761297216 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0419 01:36:30.016803 132579761297216 metric_logger.py:196] completed step: 0, seconds: 1.708, TFLOP/s/device: 31.813, Tokens/s/device: 4795.180, total_weights: 262144, loss: 10.876, lm_loss: 10.876, perplexity: 52883.598 I0419 01:36:30.621880 132579761297216 metric_logger.py:196] completed step: 1, seconds: 11.966, TFLOP/s/device: 4.542, Tokens/s/device: 684.617, total_weights: 262144, loss: 10.876, lm_loss: 10.876, perplexity: 52883.598 I0419 01:36:31.200890 132579761297216 metric_logger.py:196] completed step: 2, seconds: 0.027, TFLOP/s/device: 1977.532, Tokens/s/device: 298075.174, total_weights: 262144, loss: 10.561, lm_loss: 10.561, perplexity: 38601.980 I0419 01:36:31.780139 132579761297216 metric_logger.py:196] completed step: 3, seconds: 0.585, TFLOP/s/device: 92.839, Tokens/s/device: 13993.683, total_weights: 262144, loss: 10.270, lm_loss: 10.270, perplexity: 28865.557 I0419 01:36:32.938510 132579761297216 metric_logger.py:196] completed step: 4, seconds: 0.580, TFLOP/s/device: 93.779, Tokens/s/device: 14135.373, total_weights: 262144, loss: 10.021, lm_loss: 10.021, perplexity: 22497.775 I0419 01:36:32.946537 132579761297216 metric_logger.py:196] completed step: 5, seconds: 0.579, TFLOP/s/device: 93.919, Tokens/s/device: 14156.503, total_weights: 262144, loss: 9.819, lm_loss: 9.819, perplexity: 18383.324 I0419 01:36:33.382907 2561 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0419 01:36:35.326112 132451514361600 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints/0/items/array_metadatas/process_1 I0419 01:37:07.963344 132454224484096 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 40.966 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 38.559086084365845 s) (per-host) I0419 01:37:07.963450 132454224484096 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 38.273767s. I0419 01:37:15.890513 132454224484096 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 46.200813s. I0419 01:37:15.890812 132451505968896 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 01:37:15.890960 132451505968896 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0419 01:37:15.891011 132451505968896 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0419 01:37:15.892554 132451505968896 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0419 01:37:18.725354 132579761297216 metric_logger.py:196] completed step: 6, seconds: 1.159, TFLOP/s/device: 46.877, Tokens/s/device: 7065.797, total_weights: 262144, loss: 9.666, lm_loss: 9.666, perplexity: 15775.117 I0419 01:37:19.304297 132579761297216 metric_logger.py:196] completed step: 7, seconds: 45.201, TFLOP/s/device: 1.202, Tokens/s/device: 181.234, total_weights: 262144, loss: 9.560, lm_loss: 9.560, perplexity: 14192.143 I0419 01:37:19.883197 132579761297216 metric_logger.py:196] completed step: 8, seconds: 0.584, TFLOP/s/device: 92.984, Tokens/s/device: 14015.518, total_weights: 262144, loss: 9.495, lm_loss: 9.495, perplexity: 13292.714 I0419 01:37:20.462996 132579761297216 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0419 01:37:20.463638 132579761297216 checkpointing.py:798] Waited 0.0006592273712158203 seconds for step 9 to finish before starting checkpointing. I0419 01:37:20.465787 132579761297216 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 01:37:20.467408 132579761297216 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 9 I0419 01:37:20.468887 132579761297216 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints/9. I0419 01:37:21.179379 132579761297216 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0419 01:37:21.179470 132579761297216 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 I0419 01:37:21.217758 132579761297216 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.040039s I0419 01:37:21.217925 132579761297216 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 32.791 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.0470426082611084 s) (per-host) I0419 01:37:21.217980 132579761297216 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.047106s (batch_requests_ready=0.002595s, total_serialization_initiated=0.044441s, others=0.000070s) I0419 01:37:21.218076 132579761297216 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.051313s (all_items=0.000014s, per_item={'items': '0.00001431'}, temp_paths=0.051299) I0419 01:37:21.218783 132579761297216 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints/9. I0419 01:37:21.219068 132454199842560 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 01:57:21.219033 I0419 01:37:21.221066 132579761297216 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0419 01:37:21.221298 132453670827776 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0419 01:37:21.221421 132579761297216 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776562640.4657562, 'wait_for_prev_duration_secs': 7.033348083496094e-05, 'time_between_consecutive_saves_sec': 4.573163270950317, 'checkpointer_blocking_start_time': 1776562640.4674468, 'checkpointer_blocking_duration_secs': 0.7517821788787842, 'get_old_steps_start_time': 1776562641.2192528, 'get_old_steps_duration_secs': 3.2901763916015625e-05, 'checkpoint_manager_blocking_start_time': 1776562640.4638717, 'checkpoint_manager_blocking_duration_secs': 0.757514476776123} I0419 01:37:21.221529 132579761297216 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0419 01:37:21.221573 132579761297216 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 01:37:28.080173 132454208235264 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_06_grad_accum/checkpoints/9/items/array_metadatas/process_1 I0419 01:38:06.112075 132454199842560 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 35.148 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 44.94115471839905 s) (per-host) I0419 01:38:06.112212 132454199842560 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 44.893030s. I0419 01:38:12.853807 132454199842560 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 51.634609s. I0419 01:38:12.854106 132453670827776 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 01:38:12.854249 132453670827776 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0419 01:38:12.854299 132453670827776 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0419 01:38:12.855887 132453670827776 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0419 01:38:12.856067 132579761297216 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. I0419 01:38:12.856254 132579761297216 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 01:38:12.857251 132579761297216 metric_logger.py:196] completed step: 9, seconds: 0.579, TFLOP/s/device: 93.801, Tokens/s/device: 14138.740, 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: Sun Apr 19 01:38:24 UTC 2026 EXIT_CODE=0