feat/nnx-trainstate-and-training-loop| Metric | Linen 8bb919bd5 | NNX 8bb919bd5 | Diff (NNX − Linen) |
|---|---|---|---|
| Parameters | 1.104 billion | 1.104 billion | — |
| Final loss | 8.7740 | 8.7550 | -0.019 |
| TFLOP/s | 111.155 | 111.591 | +0.436 |
| Tok/s | 16754.5 | 16820.2 | +65.775 |
| Avg s/step | 3.504 | 3.345 | -0.159 |
| Memory % | 5.12 | 5.12 | 0 |
| JAX | 0.9.2 | 0.9.2 | — |
Diff = NNX value − Linen value. Green = NNX improved. Red = NNX regressed.
2026-04-20 14:31:43.352928: 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) I0420 14:31:43.473928 138950088178816 max_utils.py:238] Skipping jax distributed system due to skip_jax_distributed_system=True flag. I0420 14:32:09.187827 138950088178816 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 14:32:09.187950 138950088178816 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 14:32:09.187989 138950088178816 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Apr 6 2026 20:48:10 (1775533690) cl/895581894 I0420 14:32:09.188013 138950088178816 train_utils.py:365] WARNING: 'dataset_path' might be pointing your local file system I0420 14:32:09.188110 138950088178816 train.py:806] [DECOUPLED NO-OP] skipping cloud diagnostics wrapper. I0420 14:32:09.694911 138950088178816 maxtext_utils.py:1718] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 14:32:09.695113 138950088178816 maxtext_utils.py:1718] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 14:32:09.695549 138950088178816 checkpointing.py:688] Setting up checkpoint logger... I0420 14:32:09.695591 138950088178816 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 14:32:09.695632 138950088178816 pytree_checkpoint_handler.py:577] save_device_host_concurrent_bytes=None I0420 14:32:09.696231 138950088178816 base_pytree_checkpoint_handler.py:411] 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 0x7e5f419eeae0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 14:32:12.115332 138950088178816 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 14:32:12.115544 138950088178816 checkpoint_manager.py:702] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e58c3164080>}, handler_registry=None I0420 14:32:12.115872 138950088178816 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e58c3164080>` 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`. I0420 14:32:12.115916 138950088178816 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e58c3164470>` 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`. I0420 14:32:12.115946 138950088178816 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 0x7e58c3164080>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e58c3164080>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e58c3164470>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e58c3164470>}). I0420 14:32:12.116281 138950088178816 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.28 I0420 14:32:12.116334 138950088178816 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>.<lambda> at 0x7e58c3152fc0> timeout: 600 secs and primary_host=0 for async checkpoint writes I0420 14:32:12.246670 138950088178816 checkpoint_manager.py:1788] Found 0 checkpoint steps in gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints I0420 14:32:12.246922 138950088178816 checkpoint_manager.py:921] [process=0][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_hns=False, 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), root_directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e58c313b4d0> I0420 14:32:12.247014 138950088178816 checkpointing.py:302] Checkpoint manager created! I0420 14:32:12.668376 138950088178816 dataset_info.py:707] Load dataset info from tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0 I0420 14:32:12.671405 138950088178816 reader.py:262] Creating a tf.data.Dataset reading 8 files located in folders: tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0. I0420 14:32:12.730818 138950088178816 logging_logger.py:49] Constructing tf.data.Dataset __local_c4_builder for split train, from tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0 I0420 14:32:12.760494 138950088178816 tokenizer.py:245] Tokenizer path: src/maxtext/assets/tokenizers/tokenizer.llama2 I0420 14:32:12.760566 138950088178816 tokenizer.py:187] Loading sentencepiece tokenizer: src/maxtext/assets/tokenizers/tokenizer.llama2 I0420 14:32:13.580687 138950088178816 nnx_wrappers.py:437] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 14:32:13.580884 138950088178816 nnx_wrappers.py:437] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0420 14:32:13.689417 138950088178816 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 14:32:13.689504 138950088178816 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0420 14:32:13.704752 138950088178816 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 14:32:13.704804 138950088178816 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0420 14:32:13.762276 138950088178816 attentions.py:1154] attentions/query Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 14:32:13.762362 138950088178816 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0420 14:32:13.777535 138950088178816 attentions.py:1155] attentions/key Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 14:32:13.777601 138950088178816 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0420 14:32:13.804595 138950088178816 attentions.py:1156] attentions/value Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 14:32:13.804723 138950088178816 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0420 14:32:13.828952 138950088178816 attentions.py:1197] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 14:32:13.829025 138950088178816 attentions.py:1197] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0420 14:32:13.887548 138950088178816 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 14:32:13.887623 138950088178816 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, None). I0420 14:32:14.336569 138950088178816 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 14:32:14.336688 138950088178816 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. [DECOUPLED NO-OP] gcs_storage: using stubs. [DECOUPLED NO-OP] mldiagnostics: using stub. [DECOUPLED NO-OP] mldiagnostics: using stub. [DECOUPLED NO-OP] mldiagnostics: using stub. [DECOUPLED NO-OP] workload_monitor: using stub. [DECOUPLED NO-OP] vertex_tensorboard: using stub. fsdp: 8 I0420 14:32:16.722694 138950088178816 maxtext_utils.py:1821] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0420 14:32:16.722814 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0420 14:32:16.722857 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0420 14:32:16.722901 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0420 14:32:16.722941 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0420 14:32:16.722969 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0420 14:32:16.723009 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/self_attention/key/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0420 14:32:16.723119 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/self_attention/out/kernel Shape: float32[16,16,128,2048] Logical: P('heads', 'layers', 'kv', 'embed') Physical: (None, None, None, 'fsdp') I0420 14:32:16.723159 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/self_attention/query/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'q_heads', 'kv') Physical: ('fsdp', None, None, None) I0420 14:32:16.723189 138950088178816 maxtext_utils.py:1821] params/params/decoder/layers/self_attention/value/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0420 14:32:16.723227 138950088178816 maxtext_utils.py:1821] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0420 14:32:16.723262 138950088178816 maxtext_utils.py:1821] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0420 14:32:17.920759 138950088178816 train.py:157] train/xent Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0420 14:32:17.920850 138950088178816 train.py:157] train/xent Physical: float32[8,2048]............................................. ('fsdp', None). I0420 14:32:17.935400 138950088178816 train.py:164] train/z_loss Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0420 14:32:17.935455 138950088178816 train.py:164] train/z_loss Physical: float32[8,2048]............................................. ('fsdp', None). I0420 14:32:33.455797 138950088178816 max_utils.py:791] Total memory size: 3.7 GB, Output size: 1.5 GB, Temp size: 2.2 GB, Argument size: 1.5 GB, Host temp size: 0.0 GB. I0420 14:32:33.456462 138950088178816 max_utils.py:194] tensorboardX not available; using no-op SummaryWriter. I0420 14:32:33.456636 138950088178816 metric_logger.py:301] number parameters: 1.104 billion I0420 14:32:53.184210 138950088178816 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 14:32:53.326961 138950088178816 checkpointing.py:798] Waited 0.14273571968078613 seconds for step 0 to finish before starting checkpointing. I0420 14:32:53.327744 138950088178816 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 14:32:53.327956 138950088178816 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 0 I0420 14:32:53.328546 138950088178816 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0. I0420 14:32:53.417052 138950088178816 signaling_client.py:373] Using ThreadSafeKeyValueSignalingClient I0420 14:32:53.514074 138950088178816 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array. I0420 14:32:53.514219 138834371151424 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0 I0420 14:32:53.514621 138950088178816 replica_slices.py:410] 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 I0420 14:32:54.291012 138950088178816 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.777764s I0420 14:32:54.291617 138950088178816 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 14.132 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 873 milliseconds) (per-host) I0420 14:32:54.291679 138950088178816 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.873384s (batch_requests_ready=0.090614s, total_serialization_initiated=0.782331s, others=0.000439s) I0420 14:32:54.291759 138950088178816 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.874080s (all_items=0.000034s, per_item={'items': '0.00003362'}, temp_paths=0.874046) I0420 14:32:54.292715 138834291459648 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0420 14:32:54.292854 138950088178816 async_checkpointer.py:561] Finished blocking save. Time taken: 0.964846s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0. I0420 14:32:54.293180 138950088178816 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 14:32:54.293493 138950088178816 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776695573.3277242, 'wait_for_prev_duration_secs': 5.173683166503906e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776695573.3279793, 'checkpointer_blocking_duration_secs': 0.965022087097168, 'get_old_steps_start_time': 1776695574.2930257, 'get_old_steps_duration_secs': 9.036064147949219e-05, 'checkpoint_manager_blocking_start_time': 1776695573.3275702, 'checkpoint_manager_blocking_duration_secs': 0.9658830165863037} I0420 14:32:54.293610 138950088178816 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 14:32:54.293684 138950088178816 max_utils.py:750] Memstats: After params initialized: I0420 14:32:54.293783 138950088178816 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_0(process=0,(0,0,0,0)) I0420 14:32:54.293812 138950088178816 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_1(process=0,(1,0,0,0)) I0420 14:32:54.293833 138950088178816 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_2(process=0,(0,1,0,0)) I0420 14:32:54.293852 138950088178816 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_3(process=0,(1,1,0,0)) I0420 14:32:54.293869 138950088178816 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_4(process=0,(0,2,0,0)) I0420 14:32:54.293888 138950088178816 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_5(process=0,(1,2,0,0)) I0420 14:32:54.293906 138950088178816 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_6(process=0,(0,3,0,0)) I0420 14:32:54.293923 138950088178816 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_7(process=0,(1,3,0,0)) I0420 14:32:54.303129 138834360665664 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/items I0420 14:32:54.428988 138834312431168 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776695574146380075, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776695574146380075, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 14:32:54.429237 138834381637184 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 14:32:54.760890 138950088178816 metric_logger.py:196] completed step: 0, seconds: 19.727, TFLOP/s/device: 0.689, Tokens/s/device: 103.818, total_weights: 13328, loss: 10.840, lm_loss: 10.840, perplexity: 51025.957 I0420 14:32:54.761878 138950088178816 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/tensorboard/' I0420 14:32:54.782324 1046516 google_auth_provider.cc:149] Using credentials at ~/.config/gcloud/application_default_credentials.json I0420 14:32:54.782390 1046516 google_auth_provider.cc:156] Using OAuth2 AuthProvider I0420 14:32:54.880321 138950088178816 metric_logger.py:196] completed step: 1, seconds: 1.574, TFLOP/s/device: 8.633, Tokens/s/device: 1301.250, total_weights: 12332, loss: 10.869, lm_loss: 10.869, perplexity: 52515.969 I0420 14:32:55.002658 138950088178816 metric_logger.py:196] completed step: 2, seconds: 0.011, TFLOP/s/device: 1232.057, Tokens/s/device: 185709.104, total_weights: 15161, loss: 9.874, lm_loss: 9.874, perplexity: 19421.770 I0420 14:32:55.125456 138950088178816 metric_logger.py:196] completed step: 3, seconds: 0.121, TFLOP/s/device: 112.206, Tokens/s/device: 16912.900, total_weights: 13327, loss: 9.406, lm_loss: 9.406, perplexity: 12166.079 I0420 14:32:55.534858 138834350179904 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/items/array_metadatas/process_0 I0420 14:33:18.271493 138834301945408 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 23.486602s (commit=22.473421s, array_metadata_write=1.013181s) I0420 14:33:18.272739 138834291459648 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 508.433 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 24 seconds) (per-host) I0420 14:33:18.272865 138834291459648 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 23.979951s. I0420 14:33:18.493617 138834291459648 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776695574146380075, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 14:33:18.666523 138834291459648 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0420 14:33:18.865758 138834312431168 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776695574146380075, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 14:33:19.118013 138834291459648 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0420 14:33:19.118796 138834291459648 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.587437s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/items I0420 14:33:19.119587 138834291459648 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/items I0420 14:33:19.369351 138834291459648 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0 I0420 14:33:20.093771 138834291459648 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0`. I0420 14:33:20.094550 138834291459648 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 26.766553s. directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0 I0420 14:33:20.094622 138834291459648 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 25.801709s. I0420 14:33:20.094814 138834381637184 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 14:33:20.094930 138834381637184 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 14:33:20.094987 138834381637184 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 14:33:20.095036 138834381637184 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 14:33:24.463867 138950088178816 metric_logger.py:196] completed step: 4, seconds: 0.122, TFLOP/s/device: 111.157, Tokens/s/device: 16754.749, total_weights: 11939, loss: 9.149, lm_loss: 9.149, perplexity: 9403.998 I0420 14:33:24.473883 138950088178816 metric_logger.py:196] completed step: 5, seconds: 0.124, TFLOP/s/device: 109.585, Tokens/s/device: 16517.861, total_weights: 15502, loss: 9.058, lm_loss: 9.058, perplexity: 8587.564 I0420 14:33:24.594204 138950088178816 metric_logger.py:196] completed step: 6, seconds: 29.336, TFLOP/s/device: 0.463, Tokens/s/device: 69.811, total_weights: 13864, loss: 8.892, lm_loss: 8.892, perplexity: 7274.692 I0420 14:33:24.716485 138950088178816 metric_logger.py:196] completed step: 7, seconds: 0.007, TFLOP/s/device: 1911.795, Tokens/s/device: 288166.596, total_weights: 12988, loss: 8.751, lm_loss: 8.751, perplexity: 6314.503 I0420 14:33:24.839089 138950088178816 metric_logger.py:196] completed step: 8, seconds: 0.121, TFLOP/s/device: 112.108, Tokens/s/device: 16898.108, total_weights: 13820, loss: 8.791, lm_loss: 8.791, perplexity: 6573.798 I0420 14:33:24.961138 138950088178816 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 14:33:24.961989 138950088178816 checkpointing.py:798] Waited 0.0008752346038818359 seconds for step 9 to finish before starting checkpointing. I0420 14:33:24.962272 138950088178816 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 14:33:24.962429 138950088178816 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 9 I0420 14:33:24.962712 138950088178816 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9. I0420 14:33:25.137822 138950088178816 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array. I0420 14:33:25.137919 138950088178816 replica_slices.py:410] 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 I0420 14:33:25.142235 138834381637184 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9 I0420 14:33:25.816278 138834301945408 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9/items I0420 14:33:30.358177 138950088178816 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 5.220832s I0420 14:33:30.358914 138950088178816 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.324 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 5 seconds) (per-host) I0420 14:33:30.358978 138950088178816 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 5.310322s (batch_requests_ready=0.085484s, total_serialization_initiated=5.224259s, others=0.000579s) I0420 14:33:30.359065 138950088178816 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 5.311022s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=5.311007) I0420 14:33:30.364546 138834148853312 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0420 14:33:30.364652 138950088178816 async_checkpointer.py:561] Finished blocking save. Time taken: 5.402183s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9. I0420 14:33:30.364842 138950088178816 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 14:33:30.364995 138834291459648 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 14:33:30.365090 138950088178816 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776695604.9622407, 'wait_for_prev_duration_secs': 5.817413330078125e-05, 'time_between_consecutive_saves_sec': 4.867168664932251, 'checkpointer_blocking_start_time': 1776695604.9624496, 'checkpointer_blocking_duration_secs': 5.402314186096191, 'get_old_steps_start_time': 1776695610.3647811, 'get_old_steps_duration_secs': 2.3365020751953125e-05, 'checkpoint_manager_blocking_start_time': 1776695604.9622028, 'checkpoint_manager_blocking_duration_secs': 5.4028613567352295} I0420 14:33:30.365178 138950088178816 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 14:33:30.365211 138950088178816 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 14:33:31.095694 138834350179904 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9/items/array_metadatas/process_0 I0420 14:34:03.783443 138834301945408 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 33.424089s (commit=32.930338s, array_metadata_write=0.493751s) I0420 14:34:03.784865 138834148853312 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 326.228 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 38 seconds) (per-host) I0420 14:34:03.784996 138834148853312 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 33.420299s. I0420 14:34:04.182733 138834148853312 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0420 14:34:04.645004 138834148853312 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0420 14:34:04.645751 138834148853312 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.606145s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9/items I0420 14:34:04.646486 138834148853312 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9/items I0420 14:34:04.896149 138834148853312 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9 I0420 14:34:05.604598 138834148853312 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9`. I0420 14:34:05.605368 138834148853312 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 40.642905s. directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/linen_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9 I0420 14:34:05.605450 138834148853312 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 35.240755s. I0420 14:34:05.605576 138834291459648 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 14:34:05.605643 138834291459648 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 14:34:05.605710 138834291459648 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 14:34:05.605750 138834291459648 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 14:34:05.605922 138950088178816 checkpoint_manager.py:2006] [process=0][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 14:34:05.606095 138950088178816 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 14:34:05.607284 138950088178816 metric_logger.py:196] completed step: 9, seconds: 0.122, TFLOP/s/device: 111.155, Tokens/s/device: 16754.475, total_weights: 12300, loss: 8.774, lm_loss: 8.774, perplexity: 6465.313 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops
2026-04-20 15:48:20.618780: 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) I0420 15:48:20.739764 124518291291264 max_utils.py:238] Skipping jax distributed system due to skip_jax_distributed_system=True flag. I0420 15:48:48.679035 124518291291264 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 15:48:48.679166 124518291291264 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 15:48:48.679202 124518291291264 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Apr 6 2026 20:48:10 (1775533690) cl/895581894 I0420 15:48:48.679230 124518291291264 train_utils.py:365] WARNING: 'dataset_path' might be pointing your local file system I0420 15:48:48.679324 124518291291264 train.py:806] [DECOUPLED NO-OP] skipping cloud diagnostics wrapper. I0420 15:48:49.204660 124518291291264 maxtext_utils.py:1718] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 15:48:50.054140 124518291291264 checkpointing.py:688] Setting up checkpoint logger... I0420 15:48:50.054265 124518291291264 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 15:48:50.054303 124518291291264 pytree_checkpoint_handler.py:577] save_device_host_concurrent_bytes=None I0420 15:48:50.054495 124518291291264 base_pytree_checkpoint_handler.py:411] 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 0x713f15900e30>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 15:48:52.488683 124518291291264 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 15:48:52.488874 124518291291264 checkpoint_manager.py:702] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x713a10d08680>}, handler_registry=None I0420 15:48:52.489120 124518291291264 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x713a10d08680>` 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`. I0420 15:48:52.489163 124518291291264 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x713a10d09220>` 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`. I0420 15:48:52.489191 124518291291264 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 0x713a10d08680>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x713a10d08680>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x713a10d09220>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x713a10d09220>}). I0420 15:48:52.489487 124518291291264 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.28 I0420 15:48:52.489539 124518291291264 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>.<lambda> at 0x713899f38cc0> timeout: 600 secs and primary_host=0 for async checkpoint writes I0420 15:48:52.616978 124518291291264 checkpoint_manager.py:1788] Found 0 checkpoint steps in gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints I0420 15:48:52.617272 124518291291264 checkpoint_manager.py:921] [process=0][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_hns=False, 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), root_directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x713a10d0b740> I0420 15:48:52.617369 124518291291264 checkpointing.py:302] Checkpoint manager created! I0420 15:48:52.695185 124518291291264 dataset_info.py:707] Load dataset info from tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0 I0420 15:48:52.698169 124518291291264 reader.py:262] Creating a tf.data.Dataset reading 8 files located in folders: tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0. I0420 15:48:52.749993 124518291291264 logging_logger.py:49] Constructing tf.data.Dataset __local_c4_builder for split train, from tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0 I0420 15:48:52.774354 124518291291264 tokenizer.py:245] Tokenizer path: src/maxtext/assets/tokenizers/tokenizer.llama2 I0420 15:48:52.774415 124518291291264 tokenizer.py:187] Loading sentencepiece tokenizer: src/maxtext/assets/tokenizers/tokenizer.llama2 I0420 15:48:53.789422 124518291291264 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 15:48:53.789645 124518291291264 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. [DECOUPLED NO-OP] gcs_storage: using stubs. [DECOUPLED NO-OP] mldiagnostics: using stub. [DECOUPLED NO-OP] mldiagnostics: using stub. [DECOUPLED NO-OP] mldiagnostics: using stub. [DECOUPLED NO-OP] workload_monitor: using stub. [DECOUPLED NO-OP] vertex_tensorboard: using stub. fsdp: 8 I0420 15:48:57.237760 124518291291264 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 15:48:57.237856 124518291291264 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0420 15:48:57.243365 124518291291264 nnx_decoders.py:465] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 15:48:57.243411 124518291291264 nnx_decoders.py:465] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0420 15:48:57.258527 124518291291264 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 15:48:57.258579 124518291291264 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0420 15:48:57.273027 124518291291264 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 15:48:57.273091 124518291291264 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0420 15:48:57.344529 124518291291264 attentions.py:1154] attentions/query Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 15:48:57.344612 124518291291264 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0420 15:48:57.359197 124518291291264 attentions.py:1155] attentions/key Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 15:48:57.359252 124518291291264 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0420 15:48:57.373755 124518291291264 attentions.py:1156] attentions/value Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 15:48:57.373808 124518291291264 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0420 15:48:57.401622 124518291291264 attentions.py:1197] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 15:48:57.401685 124518291291264 attentions.py:1197] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0420 15:48:57.472777 124518291291264 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 15:48:57.472855 124518291291264 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, None). I0420 15:49:13.451297 124518291291264 max_utils.py:791] Total memory size: 3.7 GB, Output size: 1.5 GB, Temp size: 2.2 GB, Argument size: 1.5 GB, Host temp size: 0.0 GB. I0420 15:49:13.452235 124518291291264 max_utils.py:194] tensorboardX not available; using no-op SummaryWriter. I0420 15:49:13.454980 124518291291264 metric_logger.py:301] number parameters: 1.104 billion I0420 15:49:33.320024 124518291291264 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 15:49:33.483508 124518291291264 checkpointing.py:798] Waited 0.1634659767150879 seconds for step 0 to finish before starting checkpointing. I0420 15:49:33.484123 124518291291264 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 15:49:33.484287 124518291291264 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 0 I0420 15:49:33.484681 124518291291264 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0. I0420 15:49:33.569425 124518291291264 signaling_client.py:373] Using ThreadSafeKeyValueSignalingClient I0420 15:49:33.676462 124402582685248 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0 I0420 15:49:33.677054 124518291291264 jax_array_handlers.py:347] Scheduling D2H of 111 prioritized jax.Array. I0420 15:49:33.677281 124518291291264 replica_slices.py:410] 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 I0420 15:49:34.350518 124402572199488 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/items I0420 15:49:34.499226 124402532353600 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776700174258797081, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776700174258797081, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 15:49:35.273617 1135444 google_auth_provider.cc:149] Using credentials at ~/.config/gcloud/application_default_credentials.json I0420 15:49:35.273680 1135444 google_auth_provider.cc:156] Using OAuth2 AuthProvider I0420 15:49:35.761445 124518291291264 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 2.086690s I0420 15:49:35.762037 124518291291264 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.633 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 2 seconds) (per-host) I0420 15:49:35.762113 124518291291264 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 2.190919s (batch_requests_ready=0.088313s, total_serialization_initiated=2.102174s, others=0.000432s) I0420 15:49:35.762206 124518291291264 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 2.192230s (all_items=0.000021s, per_item={'items': '0.00002098'}, temp_paths=2.192209) I0420 15:49:35.774433 124402469439040 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0420 15:49:35.774664 124518291291264 async_checkpointer.py:561] Finished blocking save. Time taken: 2.290321s. Continuing background save to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0. I0420 15:49:35.775072 124518291291264 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 15:49:35.775344 124402448467520 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 15:49:35.775446 124518291291264 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776700173.4841104, 'wait_for_prev_duration_secs': 4.410743713378906e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776700173.4843078, 'checkpointer_blocking_duration_secs': 2.2906441688537598, 'get_old_steps_start_time': 1776700175.7749774, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776700173.4840043, 'checkpoint_manager_blocking_duration_secs': 2.2914037704467773} I0420 15:49:35.775857 124518291291264 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 15:49:35.775939 124518291291264 max_utils.py:750] Memstats: After params initialized: I0420 15:49:35.775992 124518291291264 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_0(process=0,(0,0,0,0)) I0420 15:49:35.776018 124518291291264 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_1(process=0,(1,0,0,0)) I0420 15:49:35.776039 124518291291264 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_2(process=0,(0,1,0,0)) I0420 15:49:35.776074 124518291291264 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_3(process=0,(1,1,0,0)) I0420 15:49:35.776093 124518291291264 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_4(process=0,(0,2,0,0)) I0420 15:49:35.776111 124518291291264 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_5(process=0,(1,2,0,0)) I0420 15:49:35.776129 124518291291264 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_6(process=0,(0,3,0,0)) I0420 15:49:35.776147 124518291291264 max_utils.py:756] Using (GB) 1.6 / 31.25 (5.120000%) on TPU_7(process=0,(1,3,0,0)) I0420 15:49:36.224522 124518291291264 metric_logger.py:196] completed step: 0, seconds: 19.863, TFLOP/s/device: 0.684, Tokens/s/device: 103.107, total_weights: 13328, loss: 10.880, lm_loss: 10.880, perplexity: 53080.566 I0420 15:49:36.225568 124518291291264 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/tensorboard/' I0420 15:49:36.336123 124518291291264 metric_logger.py:196] completed step: 1, seconds: 2.897, TFLOP/s/device: 4.690, Tokens/s/device: 706.972, total_weights: 12332, loss: 10.851, lm_loss: 10.851, perplexity: 51573.340 I0420 15:49:36.457884 124518291291264 metric_logger.py:196] completed step: 2, seconds: 0.036, TFLOP/s/device: 377.767, Tokens/s/device: 56941.085, total_weights: 15161, loss: 9.862, lm_loss: 9.862, perplexity: 19196.018 I0420 15:49:36.531355 124402551227968 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 111 array_metadata.ArrayMetadata to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/items/array_metadatas/process_0 I0420 15:49:36.579508 124518291291264 metric_logger.py:196] completed step: 3, seconds: 0.096, TFLOP/s/device: 142.195, Tokens/s/device: 21433.131, total_weights: 13327, loss: 9.404, lm_loss: 9.404, perplexity: 12137.980 I0420 15:49:59.736071 124402479924800 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 23.962829s (commit=23.517572s, array_metadata_write=0.445257s) I0420 15:49:59.737657 124402469439040 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 482.941 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 26 seconds) (per-host) I0420 15:49:59.737792 124402469439040 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 23.963065s. I0420 15:49:59.977430 124402469439040 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776700174258797081, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 15:50:00.162466 124402469439040 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0420 15:50:00.354328 124402532353600 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776700174258797081, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 15:50:00.622508 124402469439040 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0420 15:50:00.623365 124402469439040 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.604945s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/items I0420 15:50:00.624474 124402469439040 atomicity.py:608] Finalizing gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0/items I0420 15:50:00.862697 124402469439040 atomicity.py:608] Finalizing gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0 I0420 15:50:01.548943 124402469439040 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0`. I0420 15:50:01.549751 124402469439040 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 28.065431s. directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/0 I0420 15:50:01.549842 124402469439040 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 25.775116s. I0420 15:50:01.549986 124402448467520 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 15:50:01.550053 124402448467520 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 15:50:01.550127 124402448467520 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 15:50:01.550183 124402448467520 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 15:50:03.156260 124518291291264 metric_logger.py:196] completed step: 4, seconds: 0.122, TFLOP/s/device: 111.073, Tokens/s/device: 16742.148, total_weights: 11939, loss: 9.133, lm_loss: 9.133, perplexity: 9252.317 I0420 15:50:03.175672 124518291291264 metric_logger.py:196] completed step: 5, seconds: 0.121, TFLOP/s/device: 112.385, Tokens/s/device: 16939.900, total_weights: 15502, loss: 9.029, lm_loss: 9.029, perplexity: 8338.597 I0420 15:50:03.292538 124518291291264 metric_logger.py:196] completed step: 6, seconds: 26.581, TFLOP/s/device: 0.511, Tokens/s/device: 77.047, total_weights: 13864, loss: 8.894, lm_loss: 8.894, perplexity: 7286.662 I0420 15:50:03.414071 124518291291264 metric_logger.py:196] completed step: 7, seconds: 0.011, TFLOP/s/device: 1235.306, Tokens/s/device: 186198.745, total_weights: 12988, loss: 8.806, lm_loss: 8.806, perplexity: 6671.804 I0420 15:50:03.535563 124518291291264 metric_logger.py:196] completed step: 8, seconds: 0.118, TFLOP/s/device: 115.341, Tokens/s/device: 17385.399, total_weights: 13820, loss: 8.803, lm_loss: 8.803, perplexity: 6653.874 I0420 15:50:03.658635 124518291291264 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 15:50:03.660628 124518291291264 checkpointing.py:798] Waited 0.0020089149475097656 seconds for step 9 to finish before starting checkpointing. I0420 15:50:03.660933 124518291291264 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 15:50:03.661126 124518291291264 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 9 I0420 15:50:03.661454 124518291291264 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9. I0420 15:50:03.838806 124402448467520 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9 I0420 15:50:03.855116 124518291291264 jax_array_handlers.py:347] Scheduling D2H of 111 prioritized jax.Array. I0420 15:50:03.855218 124518291291264 replica_slices.py:410] 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 I0420 15:50:04.601647 124402479924800 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9/items I0420 15:50:07.759722 124518291291264 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 3.906398s I0420 15:50:07.768837 124518291291264 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.072 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 4 seconds) (per-host) I0420 15:50:07.768910 124518291291264 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 4.016710s (batch_requests_ready=0.087363s, total_serialization_initiated=3.920362s, others=0.008985s) I0420 15:50:07.769006 124518291291264 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 4.017355s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=4.017340) I0420 15:50:07.770635 124402593171008 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0420 15:50:07.770726 124518291291264 async_checkpointer.py:561] Finished blocking save. Time taken: 4.109556s. Continuing background save to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9. I0420 15:50:07.770932 124518291291264 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 15:50:07.771182 124402469439040 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 15:50:07.771324 124518291291264 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776700203.660898, 'wait_for_prev_duration_secs': 6.222724914550781e-05, 'time_between_consecutive_saves_sec': 2.11069917678833, 'checkpointer_blocking_start_time': 1776700203.661149, 'checkpointer_blocking_duration_secs': 4.109689474105835, 'get_old_steps_start_time': 1776700207.7708583, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776700203.660862, 'checkpoint_manager_blocking_duration_secs': 4.110432386398315} I0420 15:50:07.771463 124518291291264 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 15:50:07.771497 124518291291264 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 15:50:08.512300 124402551227968 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 111 array_metadata.ArrayMetadata to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9/items/array_metadatas/process_0 I0420 15:50:39.989860 124402479924800 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 32.220102s (commit=31.779744s, array_metadata_write=0.440358s) I0420 15:50:39.991386 124402593171008 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 348.706 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 36 seconds) (per-host) I0420 15:50:39.991448 124402593171008 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 32.220671s. I0420 15:50:40.391903 124402593171008 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0420 15:50:40.803228 124402593171008 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0420 15:50:40.804168 124402593171008 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.544120s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9/items I0420 15:50:40.804995 124402593171008 atomicity.py:608] Finalizing gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9/items I0420 15:50:41.035803 124402593171008 atomicity.py:608] Finalizing gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9 I0420 15:50:41.735783 124402593171008 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9`. I0420 15:50:41.736576 124402593171008 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 38.075413s. directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260420_142345/nnx_feat_nnx_trainstate_and_training_loop_20260420_142345_04_int8/checkpoints/9 I0420 15:50:41.736677 124402593171008 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 33.965903s. I0420 15:50:41.736927 124402469439040 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 15:50:41.737071 124402469439040 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 15:50:41.737152 124402469439040 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 15:50:41.737204 124402469439040 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 15:50:41.737368 124518291291264 checkpoint_manager.py:2006] [process=0][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 15:50:41.737700 124518291291264 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 15:50:41.739002 124518291291264 metric_logger.py:196] completed step: 9, seconds: 0.122, TFLOP/s/device: 111.591, Tokens/s/device: 16820.250, total_weights: 12300, loss: 8.755, lm_loss: 8.755, perplexity: 6343.337 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops