feat/nnx-trainstate-and-training-loop| Metric | Linen 29bbe47ed | NNX 29bbe47ed | Diff (NNX − Linen) |
|---|---|---|---|
| Parameters | 1.104 billion | 1.104 billion | — |
| Final loss | 5.9150 | 5.9080 | -0.007 |
| TFLOP/s | 114.174 | 112.689 | -1.485 |
| Tok/s | 17209.5 | 16985.7 | -223.805 |
| Avg s/step | 2.020 | 1.961 | -0.059 |
| Memory % | 5.09 | 5.09 | 0 |
| JAX | 0.8.1 | 0.8.1 | — |
Diff = NNX value − Linen value. Green = NNX improved. Red = NNX regressed.
2026-04-21 16:22:37.609360: E external/local_xla/xla/stream_executor/cuda/cuda_fft.cc:467] Unable to register cuFFT factory: Attempting to register factory for plugin cuFFT when one has already been registered WARNING: All log messages before absl::InitializeLog() is called are written to STDERR E0000 00:00:1776788557.619480 1595902 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776788557.622540 1595902 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776788557.632285 1595902 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776788557.632299 1595902 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776788557.632301 1595902 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776788557.632302 1595902 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. Unrecognized keys in `rope_scaling` for 'rope_type'='yarn': {'rope_theta'} `rope_scaling`'s factor field must be a float >= 1, got 40 `rope_scaling`'s beta_fast field must be a float, got 32 `rope_scaling`'s beta_slow field must be a float, got 1 Unrecognized keys in `rope_scaling` for 'rope_type'='yarn': {'rope_theta'} Unrecognized keys in `rope_scaling` for 'rope_type'='yarn': {'rope_theta'} Unrecognized keys in `rope_scaling` for 'rope_type'='yarn': {'rope_theta'} 2026-04-21 16:22:41.556928: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0421 16:22:41.692679 138259397581952 max_utils.py:238] Skipping jax distributed system due to skip_jax_distributed_system=True flag. I0421 16:23:09.681080 138259397581952 max_utils.py:800] System Information: Jax Version: 0.8.1 I0421 16:23:09.681207 138259397581952 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0421 16:23:09.681241 138259397581952 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709 I0421 16:23:09.681267 138259397581952 train_utils.py:378] WARNING: 'dataset_path' might be pointing your local file system I0421 16:23:09.681292 138259397581952 train_utils.py:391] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 16:23:09.681370 138259397581952 train.py:806] [DECOUPLED NO-OP] skipping cloud diagnostics wrapper. I0421 16:23:10.347446 138259397581952 maxtext_utils.py:1732] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 16:23:10.347628 138259397581952 maxtext_utils.py:1732] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 16:23:10.347792 138259397581952 checkpointing.py:688] Setting up checkpoint logger... I0421 16:23:10.347833 138259397581952 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 16:23:10.347868 138259397581952 pytree_checkpoint_handler.py:577] save_device_host_concurrent_bytes=None I0421 16:23:10.348347 138259397581952 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 0x7dbeb9f51040>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 16:23:12.769895 138259397581952 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 16:23:12.770116 138259397581952 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 0x7dbd64f4a510>}, handler_registry=None I0421 16:23:12.770353 138259397581952 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7dbd64f4a510>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0421 16:23:12.770395 138259397581952 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dbd1278a6c0>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0421 16:23:12.770424 138259397581952 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 0x7dbd64f4a510>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7dbd64f4a510>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dbd1278a6c0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dbd1278a6c0>}). I0421 16:23:12.770722 138259397581952 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.28 I0421 16:23:12.770778 138259397581952 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>.<lambda> at 0x7dbd127b4ae0> timeout: 600 secs and primary_host=0 for async checkpoint writes I0421 16:23:12.889498 138259397581952 checkpoint_manager.py:1788] Found 0 checkpoint steps in gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints I0421 16:23:12.889728 138259397581952 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_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7dbd64f08d40> I0421 16:23:12.889808 138259397581952 checkpointing.py:302] Checkpoint manager created! I0421 16:23:13.250257 138259397581952 nnx_wrappers.py:437] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 16:23:13.250354 138259397581952 nnx_wrappers.py:437] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0421 16:23:13.535827 138259397581952 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 16:23:13.535926 138259397581952 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0421 16:23:13.563075 138259397581952 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 16:23:13.563199 138259397581952 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0421 16:23:13.584208 138259397581952 attentions.py:1154] attentions/query Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 16:23:13.584267 138259397581952 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0421 16:23:13.596548 138259397581952 attentions.py:1155] attentions/key Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 16:23:13.596604 138259397581952 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0421 16:23:13.608784 138259397581952 attentions.py:1156] attentions/value Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 16:23:13.608839 138259397581952 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0421 16:23:13.628555 138259397581952 attentions.py:1198] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 16:23:13.628617 138259397581952 attentions.py:1198] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0421 16:23:13.644276 138259397581952 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 16:23:13.644329 138259397581952 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, None). I0421 16:23:13.797149 138259397581952 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 16:23:13.797273 138259397581952 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 I0421 16:23:14.353153 138259397581952 maxtext_utils.py:1835] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0421 16:23:14.353267 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 16:23:14.353310 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 16:23:14.353356 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0421 16:23:14.353395 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0421 16:23:14.353424 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0421 16:23:14.353464 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/self_attention/key/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0421 16:23:14.353506 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/self_attention/out/kernel Shape: float32[16,16,128,2048] Logical: PartitionSpec('heads', 'layers', 'kv', 'embed') Physical: (None, None, None, 'fsdp') I0421 16:23:14.353534 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/self_attention/query/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'q_heads', 'kv') Physical: ('fsdp', None, None, None) I0421 16:23:14.353559 138259397581952 maxtext_utils.py:1835] params/params/decoder/layers/self_attention/value/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0421 16:23:14.353595 138259397581952 maxtext_utils.py:1835] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed_vocab', 'vocab') Physical: ('fsdp', None) I0421 16:23:14.353630 138259397581952 maxtext_utils.py:1835] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0421 16:23:14.759037 138259397581952 train.py:157] train/xent Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0421 16:23:14.759138 138259397581952 train.py:157] train/xent Physical: float32[8,2048]............................................. ('fsdp', None). I0421 16:23:14.770659 138259397581952 train.py:164] train/z_loss Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0421 16:23:14.770713 138259397581952 train.py:164] train/z_loss Physical: float32[8,2048]............................................. ('fsdp', None). I0421 16:23:15.501769 138259397581952 max_utils.py:791] Total memory size: 3.6 GB, Output size: 1.5 GB, Temp size: 2.0 GB, Argument size: 1.5 GB, Host temp size: 0.0 GB. I0421 16:23:15.502346 138259397581952 max_utils.py:194] tensorboardX not available; using no-op SummaryWriter. I0421 16:23:15.502531 138259397581952 metric_logger.py:301] number parameters: 1.104 billion I0421 16:23:18.539709 138259397581952 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 16:23:18.657179 138259397581952 checkpointing.py:798] Waited 0.11746406555175781 seconds for step 0 to finish before starting checkpointing. I0421 16:23:18.657796 138259397581952 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 16:23:18.658003 138259397581952 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 0 I0421 16:23:18.658544 138259397581952 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0. I0421 16:23:18.746428 138259397581952 signaling_client.py:373] Using ThreadSafeKeyValueSignalingClient I0421 16:23:18.835487 138175255152192 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0 I0421 16:23:18.844159 138259397581952 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array. I0421 16:23:18.844251 138259397581952 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 I0421 16:23:19.593139 138175244666432 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/items I0421 16:23:19.758207 138175209014848 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776788599513460785, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776788599513460785, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/_CHECKPOINT_METADATA I0421 16:23:20.134486 1597811 google_auth_provider.cc:149] Using credentials at ~/.config/gcloud/application_default_credentials.json I0421 16:23:20.134553 1597811 google_auth_provider.cc:156] Using OAuth2 AuthProvider I0421 16:23:20.769815 138259397581952 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 1.926121s I0421 16:23:20.770474 138259397581952 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 6.102 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 2 seconds) (per-host) I0421 16:23:20.770529 138259397581952 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 2.022656s (batch_requests_ready=0.092310s, total_serialization_initiated=1.929813s, others=0.000533s) I0421 16:23:20.770596 138259397581952 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 2.023601s (all_items=0.000025s, per_item={'items': '0.00002456'}, temp_paths=2.023576) I0421 16:23:20.777011 138175265637952 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0421 16:23:20.777121 138259397581952 async_checkpointer.py:561] Finished blocking save. Time taken: 2.119073s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0. I0421 16:23:20.777320 138259397581952 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 16:23:20.777533 138175156586048 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0421 16:23:20.777655 138259397581952 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776788598.6577818, 'wait_for_prev_duration_secs': 4.172325134277344e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776788598.6580257, 'checkpointer_blocking_duration_secs': 2.119208335876465, 'get_old_steps_start_time': 1776788600.777252, 'get_old_steps_duration_secs': 3.0994415283203125e-05, 'checkpoint_manager_blocking_start_time': 1776788598.6576614, 'checkpoint_manager_blocking_duration_secs': 2.1199684143066406} I0421 16:23:20.777775 138259397581952 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 16:23:20.777822 138259397581952 max_utils.py:750] Memstats: After params initialized: I0421 16:23:20.777871 138259397581952 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_0(process=0,(0,0,0,0)) I0421 16:23:20.777897 138259397581952 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_1(process=0,(1,0,0,0)) I0421 16:23:20.777917 138259397581952 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_2(process=0,(0,1,0,0)) I0421 16:23:20.777940 138259397581952 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_3(process=0,(1,1,0,0)) I0421 16:23:20.777957 138259397581952 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_4(process=0,(0,2,0,0)) I0421 16:23:20.777975 138259397581952 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_5(process=0,(1,2,0,0)) I0421 16:23:20.777992 138259397581952 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_6(process=0,(0,3,0,0)) I0421 16:23:20.778008 138259397581952 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_7(process=0,(1,3,0,0)) I0421 16:23:21.145431 138259397581952 metric_logger.py:196] completed step: 0, seconds: 3.036, TFLOP/s/device: 4.475, Tokens/s/device: 674.469, total_weights: 16384, loss: 10.874, lm_loss: 10.874, perplexity: 52770.941 I0421 16:23:21.146429 138259397581952 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/tensorboard/' I0421 16:23:21.261950 138259397581952 metric_logger.py:196] completed step: 1, seconds: 2.604, TFLOP/s/device: 5.218, Tokens/s/device: 786.552, total_weights: 16384, loss: 10.874, lm_loss: 10.874, perplexity: 52770.941 I0421 16:23:21.381443 138259397581952 metric_logger.py:196] completed step: 2, seconds: 0.007, TFLOP/s/device: 1992.832, Tokens/s/device: 300381.344, total_weights: 16384, loss: 9.775, lm_loss: 9.775, perplexity: 17589.287 I0421 16:23:21.499990 138259397581952 metric_logger.py:196] completed step: 3, seconds: 0.117, TFLOP/s/device: 115.828, Tokens/s/device: 17458.910, total_weights: 16384, loss: 8.838, lm_loss: 8.838, perplexity: 6892.933 I0421 16:23:21.515153 138175223694912 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_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/items/array_metadatas/process_0 I0421 16:23:36.467418 138259397581952 metric_logger.py:196] completed step: 4, seconds: 0.119, TFLOP/s/device: 113.732, Tokens/s/device: 17142.953, total_weights: 16384, loss: 7.965, lm_loss: 7.965, perplexity: 2878.644 I0421 16:23:36.478362 138259397581952 metric_logger.py:196] completed step: 5, seconds: 0.118, TFLOP/s/device: 114.695, Tokens/s/device: 17288.098, total_weights: 16384, loss: 7.233, lm_loss: 7.233, perplexity: 1383.750 I0421 16:23:36.595918 138259397581952 metric_logger.py:196] completed step: 6, seconds: 14.971, TFLOP/s/device: 0.908, Tokens/s/device: 136.794, total_weights: 16384, loss: 6.676, lm_loss: 6.676, perplexity: 793.531 I0421 16:23:36.715005 138259397581952 metric_logger.py:196] completed step: 7, seconds: 0.005, TFLOP/s/device: 2475.789, Tokens/s/device: 373177.843, total_weights: 16384, loss: 6.293, lm_loss: 6.293, perplexity: 540.860 I0421 16:23:36.834178 138259397581952 metric_logger.py:196] completed step: 8, seconds: 0.119, TFLOP/s/device: 114.544, Tokens/s/device: 17265.362, total_weights: 16384, loss: 6.055, lm_loss: 6.055, perplexity: 426.371 I0421 16:23:36.952227 138259397581952 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 16:23:36.953007 138259397581952 checkpointing.py:798] Waited 0.0008182525634765625 seconds for step 9 to finish before starting checkpointing. I0421 16:23:36.953345 138259397581952 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 16:23:55.144152 138175167071808 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 34.367797s (commit=33.915628s, array_metadata_write=0.452169s) I0421 16:23:55.145359 138175265637952 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 347.189 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 36 seconds) (per-host) I0421 16:23:55.145441 138175265637952 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 34.368268s. I0421 16:23:55.364751 138175265637952 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776788599513460785, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/_CHECKPOINT_METADATA I0421 16:23:55.572716 138175265637952 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0421 16:23:55.752844 138175209014848 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776788599513460785, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/_CHECKPOINT_METADATA I0421 16:23:56.006865 138175265637952 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0421 16:23:56.007078 138175265637952 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.597071s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/items I0421 16:23:56.007819 138175265637952 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/items I0421 16:23:56.257072 138175265637952 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0 I0421 16:23:56.946440 138175265637952 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_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0`. I0421 16:23:56.947203 138175265637952 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 38.289159s. directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0 I0421 16:23:56.947309 138175265637952 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 36.170140s. I0421 16:23:56.947534 138175156586048 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 16:23:56.947662 138175156586048 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0421 16:23:56.947728 138175156586048 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 16:23:56.947790 138175156586048 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 16:23:56.948084 138259397581952 checkpoint_manager.py:2006] [process=0][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0421 16:23:56.948158 138259397581952 checkpoint_manager.py:1441] Waiting for previous save to complete took 19.994845 seconds. If this number is high, consider checkpointing less frequently. I0421 16:23:56.949271 138259397581952 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 9 I0421 16:23:56.949541 138259397581952 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9. I0421 16:23:57.120710 138259397581952 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array. I0421 16:23:57.120823 138259397581952 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 I0421 16:23:57.128927 138175156586048 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9 I0421 16:23:57.865660 138175135614528 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9/items I0421 16:24:04.008953 138259397581952 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 6.888695s I0421 16:24:04.013648 138259397581952 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 1.768 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 6 seconds) (per-host) I0421 16:24:04.013719 138259397581952 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 6.979332s (batch_requests_ready=0.082992s, total_serialization_initiated=6.891791s, others=0.004550s) I0421 16:24:04.013832 138259397581952 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 6.979956s (all_items=0.000026s, per_item={'items': '0.00002551'}, temp_paths=6.979930) I0421 16:24:04.015442 138175265637952 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0421 16:24:04.015531 138259397581952 async_checkpointer.py:561] Finished blocking save. Time taken: 7.066212s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9. I0421 16:24:04.015744 138259397581952 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 16:24:04.015918 138173975889472 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0421 16:24:04.016037 138259397581952 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776788616.953288, 'wait_for_prev_duration_secs': 19.994845151901245, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776788636.949295, 'checkpointer_blocking_duration_secs': 7.066346645355225, 'get_old_steps_start_time': 1776788644.0156574, 'get_old_steps_duration_secs': 4.1484832763671875e-05, 'checkpoint_manager_blocking_start_time': 1776788616.9532185, 'checkpoint_manager_blocking_duration_secs': 27.062793016433716} I0421 16:24:04.016202 138259397581952 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 16:24:04.016242 138259397581952 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 16:24:04.753328 138188593038912 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_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9/items/array_metadatas/process_0 I0421 16:24:37.535795 138175135614528 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 33.521300s (commit=33.037495s, array_metadata_write=0.483805s) I0421 16:24:37.537088 138175265637952 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 311.999 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 40 seconds) (per-host) I0421 16:24:37.537200 138175265637952 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 33.521624s. I0421 16:24:37.930225 138175265637952 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0421 16:24:38.400877 138175265637952 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0421 16:24:38.401094 138175265637952 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.597899s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9/items I0421 16:24:38.401824 138175265637952 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9/items I0421 16:24:38.642655 138175265637952 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9 I0421 16:24:39.300597 138175265637952 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_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9`. I0421 16:24:39.301352 138175265637952 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 42.352042s. directory=gs://wanglance-maxtext/linen_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/linen_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9 I0421 16:24:39.301429 138175265637952 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 35.285855s. I0421 16:24:39.301602 138173975889472 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 16:24:39.301713 138173975889472 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0421 16:24:39.301779 138173975889472 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 16:24:39.301827 138173975889472 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 16:24:39.302366 138259397581952 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. I0421 16:24:39.302521 138259397581952 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 16:24:39.303793 138259397581952 metric_logger.py:196] completed step: 9, seconds: 0.119, TFLOP/s/device: 114.174, Tokens/s/device: 17209.506, total_weights: 16384, loss: 5.915, lm_loss: 5.915, perplexity: 370.653 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops
2026-04-21 17:43:58.277086: E external/local_xla/xla/stream_executor/cuda/cuda_fft.cc:467] Unable to register cuFFT factory: Attempting to register factory for plugin cuFFT when one has already been registered WARNING: All log messages before absl::InitializeLog() is called are written to STDERR E0000 00:00:1776793438.287297 1666086 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776793438.290386 1666086 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776793438.300439 1666086 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776793438.300450 1666086 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776793438.300452 1666086 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776793438.300454 1666086 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. Unrecognized keys in `rope_scaling` for 'rope_type'='yarn': {'rope_theta'} `rope_scaling`'s factor field must be a float >= 1, got 40 `rope_scaling`'s beta_fast field must be a float, got 32 `rope_scaling`'s beta_slow field must be a float, got 1 Unrecognized keys in `rope_scaling` for 'rope_type'='yarn': {'rope_theta'} Unrecognized keys in `rope_scaling` for 'rope_type'='yarn': {'rope_theta'} Unrecognized keys in `rope_scaling` for 'rope_type'='yarn': {'rope_theta'} 2026-04-21 17:44:01.952148: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0421 17:44:02.088097 133275669077120 max_utils.py:238] Skipping jax distributed system due to skip_jax_distributed_system=True flag. I0421 17:44:30.358354 133275669077120 max_utils.py:800] System Information: Jax Version: 0.8.1 I0421 17:44:30.358534 133275669077120 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0421 17:44:30.358568 133275669077120 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709 I0421 17:44:30.358597 133275669077120 train_utils.py:378] WARNING: 'dataset_path' might be pointing your local file system I0421 17:44:30.358623 133275669077120 train_utils.py:391] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 17:44:30.358737 133275669077120 train.py:806] [DECOUPLED NO-OP] skipping cloud diagnostics wrapper. I0421 17:44:30.983484 133275669077120 maxtext_utils.py:1732] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 17:44:31.084660 133275669077120 checkpointing.py:688] Setting up checkpoint logger... I0421 17:44:31.084774 133275669077120 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 17:44:31.084862 133275669077120 pytree_checkpoint_handler.py:577] save_device_host_concurrent_bytes=None I0421 17:44:31.085111 133275669077120 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 0x79365cda3530>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 17:44:33.568387 133275669077120 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 17:44:33.568650 133275669077120 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 0x7934b4ddfe30>}, handler_registry=None I0421 17:44:33.569020 133275669077120 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7934b4ddfe30>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0421 17:44:33.569076 133275669077120 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7934b49069c0>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0421 17:44:33.569107 133275669077120 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 0x7934b4ddfe30>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7934b4ddfe30>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7934b49069c0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7934b49069c0>}). I0421 17:44:33.569405 133275669077120 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.28 I0421 17:44:33.569470 133275669077120 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>.<lambda> at 0x7934b61b4c20> timeout: 600 secs and primary_host=0 for async checkpoint writes I0421 17:44:33.692970 133275669077120 checkpoint_manager.py:1788] Found 0 checkpoint steps in gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints I0421 17:44:33.693258 133275669077120 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_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7934b4ddfc80> I0421 17:44:33.693351 133275669077120 checkpointing.py:302] Checkpoint manager created! I0421 17:44:34.087077 133275669077120 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 17:44:34.087199 133275669077120 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 I0421 17:44:34.930024 133275669077120 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 17:44:34.930319 133275669077120 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0421 17:44:34.936444 133275669077120 nnx_decoders.py:465] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 17:44:34.936608 133275669077120 nnx_decoders.py:465] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0421 17:44:34.949243 133275669077120 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 17:44:34.949324 133275669077120 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0421 17:44:34.961204 133275669077120 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 17:44:34.961282 133275669077120 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0421 17:44:34.982327 133275669077120 attentions.py:1154] attentions/query Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 17:44:34.982414 133275669077120 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0421 17:44:34.994598 133275669077120 attentions.py:1155] attentions/key Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 17:44:34.994680 133275669077120 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0421 17:44:35.006664 133275669077120 attentions.py:1156] attentions/value Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 17:44:35.006745 133275669077120 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0421 17:44:35.028286 133275669077120 attentions.py:1198] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 17:44:35.028380 133275669077120 attentions.py:1198] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0421 17:44:35.045389 133275669077120 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 17:44:35.045475 133275669077120 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, None). I0421 17:44:35.875205 133275669077120 max_utils.py:791] Total memory size: 3.6 GB, Output size: 1.5 GB, Temp size: 2.0 GB, Argument size: 1.5 GB, Host temp size: 0.0 GB. I0421 17:44:35.875850 133275669077120 max_utils.py:194] tensorboardX not available; using no-op SummaryWriter. I0421 17:44:35.877264 133275669077120 metric_logger.py:301] number parameters: 1.104 billion I0421 17:44:38.909821 133275669077120 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 17:44:39.026239 133275669077120 checkpointing.py:798] Waited 0.11640334129333496 seconds for step 0 to finish before starting checkpointing. I0421 17:44:39.026718 133275669077120 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 17:44:39.026869 133275669077120 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 0 I0421 17:44:39.027303 133275669077120 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0. I0421 17:44:39.113941 133275669077120 signaling_client.py:373] Using ThreadSafeKeyValueSignalingClient I0421 17:44:39.209328 133191516030528 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0 I0421 17:44:39.230352 133275669077120 jax_array_handlers.py:347] Scheduling D2H of 69 prioritized jax.Array. I0421 17:44:39.230455 133275669077120 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 I0421 17:44:39.909437 133191505544768 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/items I0421 17:44:40.072624 133191474087488 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776793479810459854, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776793479810459854, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/_CHECKPOINT_METADATA I0421 17:44:40.425441 133275669077120 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 1.197140s I0421 17:44:40.425958 133275669077120 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 9.418 GiB/s (total gbytes: 12.3 GiB) (time elapsed: a second) (per-host) I0421 17:44:40.426009 133275669077120 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 1.310360s (batch_requests_ready=0.104980s, total_serialization_initiated=1.204988s, others=0.000392s) I0421 17:44:40.426086 133275669077120 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 1.311568s (all_items=0.000020s, per_item={'items': '0.00002003'}, temp_paths=1.311548) I0421 17:44:40.427058 133191453115968 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0421 17:44:40.427170 133275669077120 async_checkpointer.py:561] Finished blocking save. Time taken: 1.400261s. Continuing background save to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0. I0421 17:44:40.427368 133275669077120 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 17:44:40.427658 133191526516288 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0421 17:44:40.427785 133275669077120 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776793479.0267048, 'wait_for_prev_duration_secs': 4.172325134277344e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776793479.02689, 'checkpointer_blocking_duration_secs': 1.4004004001617432, 'get_old_steps_start_time': 1776793480.427309, 'get_old_steps_duration_secs': 2.2172927856445312e-05, 'checkpoint_manager_blocking_start_time': 1776793479.0266206, 'checkpoint_manager_blocking_duration_secs': 1.4011366367340088} I0421 17:44:40.427908 133275669077120 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 17:44:40.427958 133275669077120 max_utils.py:750] Memstats: After params initialized: I0421 17:44:40.428447 133275669077120 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_0(process=0,(0,0,0,0)) I0421 17:44:40.428479 133275669077120 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_1(process=0,(1,0,0,0)) I0421 17:44:40.428499 133275669077120 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_2(process=0,(0,1,0,0)) I0421 17:44:40.428518 133275669077120 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_3(process=0,(1,1,0,0)) I0421 17:44:40.428534 133275669077120 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_4(process=0,(0,2,0,0)) I0421 17:44:40.428551 133275669077120 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_5(process=0,(1,2,0,0)) I0421 17:44:40.428568 133275669077120 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_6(process=0,(0,3,0,0)) I0421 17:44:40.428583 133275669077120 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_7(process=0,(1,3,0,0)) I0421 17:44:40.478077 1668122 google_auth_provider.cc:149] Using credentials at ~/.config/gcloud/application_default_credentials.json I0421 17:44:40.478152 1668122 google_auth_provider.cc:156] Using OAuth2 AuthProvider I0421 17:44:40.843487 133275669077120 metric_logger.py:196] completed step: 0, seconds: 3.031, TFLOP/s/device: 4.482, Tokens/s/device: 675.638, total_weights: 16384, loss: 10.881, lm_loss: 10.881, perplexity: 53156.906 I0421 17:44:40.844473 133275669077120 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/tensorboard/' I0421 17:44:40.955740 133275669077120 metric_logger.py:196] completed step: 1, seconds: 1.930, TFLOP/s/device: 7.041, Tokens/s/device: 1061.315, total_weights: 16384, loss: 10.881, lm_loss: 10.881, perplexity: 53156.906 I0421 17:44:41.075001 133275669077120 metric_logger.py:196] completed step: 2, seconds: 0.019, TFLOP/s/device: 729.393, Tokens/s/device: 109942.023, total_weights: 16384, loss: 9.779, lm_loss: 9.779, perplexity: 17650.354 I0421 17:44:41.194017 133275669077120 metric_logger.py:196] completed step: 3, seconds: 0.105, TFLOP/s/device: 130.018, Tokens/s/device: 19597.711, total_weights: 16384, loss: 8.837, lm_loss: 8.837, perplexity: 6882.615 I0421 17:44:56.280954 133275669077120 metric_logger.py:196] completed step: 4, seconds: 0.120, TFLOP/s/device: 113.174, Tokens/s/device: 17058.848, total_weights: 16384, loss: 7.961, lm_loss: 7.961, perplexity: 2866.817 I0421 17:44:56.283240 133191516030528 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/items/array_metadatas/process_0 I0421 17:44:56.317211 133275669077120 metric_logger.py:196] completed step: 5, seconds: 0.118, TFLOP/s/device: 114.958, Tokens/s/device: 17327.738, total_weights: 16384, loss: 7.226, lm_loss: 7.226, perplexity: 1375.026 I0421 17:44:56.432497 133275669077120 metric_logger.py:196] completed step: 6, seconds: 15.114, TFLOP/s/device: 0.899, Tokens/s/device: 135.503, total_weights: 16384, loss: 6.669, lm_loss: 6.669, perplexity: 787.910 I0421 17:44:56.551773 133275669077120 metric_logger.py:196] completed step: 7, seconds: 0.008, TFLOP/s/device: 1608.135, Tokens/s/device: 242395.550, total_weights: 16384, loss: 6.286, lm_loss: 6.286, perplexity: 536.857 I0421 17:44:56.670821 133275669077120 metric_logger.py:196] completed step: 8, seconds: 0.117, TFLOP/s/device: 116.361, Tokens/s/device: 17539.202, total_weights: 16384, loss: 6.048, lm_loss: 6.048, perplexity: 423.078 I0421 17:44:56.789955 133275669077120 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 17:44:56.791331 133275669077120 checkpointing.py:798] Waited 0.001392364501953125 seconds for step 9 to finish before starting checkpointing. I0421 17:44:56.791697 133275669077120 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 17:45:33.709493 133191495059008 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 53.227789s (commit=52.789345s, array_metadata_write=0.438444s) I0421 17:45:33.710770 133191453115968 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 231.464 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 54 seconds) (per-host) I0421 17:45:33.710898 133191453115968 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 53.283675s. I0421 17:45:33.964508 133191453115968 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776793479810459854, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/_CHECKPOINT_METADATA I0421 17:45:34.143302 133191453115968 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0421 17:45:34.348010 133191474087488 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776793479810459854, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/_CHECKPOINT_METADATA I0421 17:45:34.557661 133191453115968 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0421 17:45:34.558304 133191453115968 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.554036s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/items I0421 17:45:34.559040 133191453115968 atomicity.py:608] Finalizing gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0/items I0421 17:45:34.800031 133191453115968 atomicity.py:608] Finalizing gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0 I0421 17:45:35.480299 133191453115968 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_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0`. I0421 17:45:35.481062 133191453115968 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 56.454145s. directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/0 I0421 17:45:35.481148 133191453115968 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 55.053930s. I0421 17:45:35.481394 133191526516288 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 17:45:35.481527 133191526516288 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0421 17:45:35.481594 133191526516288 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 17:45:35.481652 133191526516288 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 17:45:35.481775 133275669077120 checkpoint_manager.py:2006] [process=0][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0421 17:45:35.481858 133275669077120 checkpoint_manager.py:1441] Waiting for previous save to complete took 38.690199 seconds. If this number is high, consider checkpointing less frequently. I0421 17:45:35.483000 133275669077120 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 9 I0421 17:45:35.483292 133275669077120 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9. I0421 17:45:35.670415 133191526516288 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9 I0421 17:45:35.681061 133275669077120 jax_array_handlers.py:347] Scheduling D2H of 69 prioritized jax.Array. I0421 17:45:35.681175 133275669077120 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 I0421 17:45:36.465287 133191390201408 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9/items I0421 17:45:43.653133 133275669077120 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 7.973418s I0421 17:45:43.653762 133275669077120 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 1.529 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 8 seconds) (per-host) I0421 17:45:43.653831 133275669077120 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 8.070130s (batch_requests_ready=0.088496s, total_serialization_initiated=7.981151s, others=0.000484s) I0421 17:45:43.653961 133275669077120 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 8.070791s (all_items=0.000026s, per_item={'items': '0.00002551'}, temp_paths=8.070766) I0421 17:45:43.661454 133191453115968 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0421 17:45:43.661661 133275669077120 async_checkpointer.py:561] Finished blocking save. Time taken: 8.178614s. Continuing background save to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9. I0421 17:45:43.661855 133275669077120 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 17:45:43.661997 133191526516288 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0421 17:45:43.662117 133275669077120 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776793496.7916315, 'wait_for_prev_duration_secs': 38.69019889831543, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776793535.4830236, 'checkpointer_blocking_duration_secs': 8.178710222244263, 'get_old_steps_start_time': 1776793543.6617591, 'get_old_steps_duration_secs': 5.030632019042969e-05, 'checkpoint_manager_blocking_start_time': 1776793496.791555, 'checkpoint_manager_blocking_duration_secs': 46.87053084373474} I0421 17:45:43.662274 133275669077120 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 17:45:43.662307 133275669077120 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 17:45:44.404906 133191516030528 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9/items/array_metadatas/process_0 I0421 17:46:25.385732 133191495059008 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.724977s (commit=41.312475s, array_metadata_write=0.412502s) I0421 17:46:25.387156 133191453115968 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 253.734 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 49 seconds) (per-host) I0421 17:46:25.387272 133191453115968 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.725653s. I0421 17:46:25.836170 133191453115968 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0421 17:46:26.262353 133191453115968 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0421 17:46:26.263019 133191453115968 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.574178s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9/items I0421 17:46:26.263807 133191453115968 atomicity.py:608] Finalizing gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9/items I0421 17:46:26.519176 133191453115968 atomicity.py:608] Finalizing gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9 I0421 17:46:27.186311 133191453115968 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_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9`. I0421 17:46:27.187073 133191453115968 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 51.704033s. directory=gs://wanglance-maxtext/nnx_ckpt_feat_nnx_trainstate_and_training_loop_20260421_161934/nnx_feat_nnx_trainstate_and_training_loop_20260421_161934_02_synthetic/checkpoints/9 I0421 17:46:27.187152 133191453115968 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 43.525535s. I0421 17:46:27.187279 133191526516288 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 17:46:27.187331 133191526516288 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0421 17:46:27.187395 133191526516288 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 17:46:27.187443 133191526516288 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 17:46:27.187604 133275669077120 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. I0421 17:46:27.187782 133275669077120 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 17:46:27.188907 133275669077120 metric_logger.py:196] completed step: 9, seconds: 0.121, TFLOP/s/device: 112.689, Tokens/s/device: 16985.701, total_weights: 16384, loss: 5.908, lm_loss: 5.908, perplexity: 367.912 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops