2026-04-23 02:27:23.508613: 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 00:00:1776911243.521951 2323355 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776911243.525774 2323355 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776911243.537300 2323355 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776911243.537314 2323355 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776911243.537316 2323355 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776911243.537317 2323355 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'} 2026-04-23 02:27:27.397334: 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) I0423 02:27:27.532574 123575462741824 max_utils.py:238] Skipping jax distributed system due to skip_jax_distributed_system=True flag. I0423 02:28:12.478704 123575462741824 max_utils.py:800] System Information: Jax Version: 0.8.1 I0423 02:28:12.478828 123575462741824 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0423 02:28:12.478868 123575462741824 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 I0423 02:28:12.478893 123575462741824 train_utils.py:348] WARNING: 'dataset_path' might be pointing your local file system I0423 02:28:12.478917 123575462741824 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0423 02:28:12.479002 123575462741824 train.py:703] [DECOUPLED NO-OP] skipping cloud diagnostics wrapper. I0423 02:28:13.147763 123575462741824 maxtext_utils.py:1604] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0423 02:28:13.148058 123575462741824 checkpointing.py:677] Setting up checkpoint logger... I0423 02:28:13.148110 123575462741824 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0423 02:28:13.148149 123575462741824 pytree_checkpoint_handler.py:577] save_device_host_concurrent_bytes=None I0423 02:28:13.148587 123575462741824 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 0x7063ddfb1d90>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0423 02:28:15.541406 123575462741824 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0423 02:28:15.541872 123575462741824 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 0x70620d7f5a60>}, handler_registry=None I0423 02:28:15.542208 123575462741824 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x70620d7f5a60>` 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`. I0423 02:28:15.542252 123575462741824 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7062827e82f0>` 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`. I0423 02:28:15.542284 123575462741824 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 0x70620d7f5a60>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x70620d7f5a60>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7062827e82f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7062827e82f0>}). I0423 02:28:15.542747 123575462741824 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.28 I0423 02:28:15.542814 123575462741824 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>.<lambda> at 0x706203f04900> timeout: 600 secs and primary_host=0 for async checkpoint writes I0423 02:28:15.674555 123575462741824 checkpoint_manager.py:1788] Found 0 checkpoint steps in gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints I0423 02:28:15.674810 123575462741824 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=5), 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_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7063f793f7a0> I0423 02:28:15.675108 123575462741824 checkpointing.py:301] Checkpoint manager created! I0423 02:28:16.063362 123575462741824 nnx_wrappers.py:437] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0423 02:28:16.063464 123575462741824 nnx_wrappers.py:437] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0423 02:28:16.355072 123575462741824 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 02:28:16.355166 123575462741824 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0423 02:28:16.367710 123575462741824 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 02:28:16.367761 123575462741824 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None). I0423 02:28:16.387320 123575462741824 attentions.py:1154] attentions/query Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 02:28:16.387377 123575462741824 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0423 02:28:16.400113 123575462741824 attentions.py:1155] attentions/key Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 02:28:16.400164 123575462741824 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0423 02:28:16.412745 123575462741824 attentions.py:1156] attentions/value Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 02:28:16.412800 123575462741824 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0423 02:28:16.432624 123575462741824 attentions.py:1198] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0423 02:28:16.432688 123575462741824 attentions.py:1198] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None). I0423 02:28:16.448232 123575462741824 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0423 02:28:16.448288 123575462741824 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, None). I0423 02:28:16.599420 123575462741824 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0423 02:28:16.599525 123575462741824 checkpointing.py:665] 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 I0423 02:28:17.236914 123575462741824 maxtext_utils.py:1707] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0423 02:28:17.237026 123575462741824 maxtext_utils.py:1707] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0423 02:28:17.237088 123575462741824 maxtext_utils.py:1707] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0423 02:28:17.237136 123575462741824 maxtext_utils.py:1707] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0423 02:28:17.237181 123575462741824 maxtext_utils.py:1707] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0423 02:28:17.237212 123575462741824 maxtext_utils.py:1707] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0423 02:28:17.237252 123575462741824 maxtext_utils.py:1707] 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) I0423 02:28:17.237291 123575462741824 maxtext_utils.py:1707] 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') I0423 02:28:17.237320 123575462741824 maxtext_utils.py:1707] 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) I0423 02:28:17.237346 123575462741824 maxtext_utils.py:1707] 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) I0423 02:28:17.237380 123575462741824 maxtext_utils.py:1707] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed_vocab', 'vocab') Physical: ('fsdp', None) I0423 02:28:17.237416 123575462741824 maxtext_utils.py:1707] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0423 02:28:17.646234 123575462741824 train.py:155] train/xent Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0423 02:28:17.646331 123575462741824 train.py:155] train/xent Physical: float32[8,2048]............................................. ('fsdp', None). I0423 02:28:17.657943 123575462741824 train.py:162] train/z_loss Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0423 02:28:17.657994 123575462741824 train.py:162] train/z_loss Physical: float32[8,2048]............................................. ('fsdp', None). I0423 02:28:18.448701 123575462741824 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. I0423 02:28:18.449248 123575462741824 max_utils.py:194] tensorboardX not available; using no-op SummaryWriter. I0423 02:28:18.449402 123575462741824 metric_logger.py:301] number parameters: 1.104 billion I0423 02:28:20.909426 123575462741824 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0423 02:28:21.027534 123575462741824 checkpointing.py:776] Waited 0.11808252334594727 seconds for step 0 to finish before starting checkpointing. I0423 02:28:21.028234 123575462741824 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 02:28:21.028394 123575462741824 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 0 I0423 02:28:21.028809 123575462741824 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0. I0423 02:28:21.128700 123575462741824 signaling_client.py:373] Using ThreadSafeKeyValueSignalingClient I0423 02:28:21.218625 123575462741824 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array. I0423 02:28:21.218780 123544251926080 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0 I0423 02:28:21.219152 123575462741824 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 I0423 02:28:21.947874 123544241440320 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0/items I0423 02:28:22.100714 123544209983040 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776911301859394101, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776911301859394101, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0/_CHECKPOINT_METADATA I0423 02:28:22.436775 2325405 google_auth_provider.cc:149] Using credentials at ~/.config/gcloud/application_default_credentials.json I0423 02:28:22.436834 2325405 google_auth_provider.cc:156] Using OAuth2 AuthProvider I0423 02:28:22.864487 123575462741824 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 1.646487s I0423 02:28:22.870490 123575462741824 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 7.090 GiB/s (total gbytes: 12.3 GiB) (time elapsed: a second) (per-host) I0423 02:28:22.870556 123575462741824 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 1.740772s (batch_requests_ready=0.084471s, total_serialization_initiated=1.650407s, others=0.005894s) I0423 02:28:22.870636 123575462741824 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 1.741384s (all_items=0.000021s, per_item={'items': '0.00002050'}, temp_paths=1.741364) I0423 02:28:22.872028 123543421453888 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0423 02:28:22.872149 123575462741824 async_checkpointer.py:561] Finished blocking save. Time taken: 1.843713s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0. I0423 02:28:22.872352 123575462741824 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0423 02:28:22.872520 123544262411840 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0423 02:28:22.872616 123575462741824 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776911301.0282197, 'wait_for_prev_duration_secs': 4.363059997558594e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776911301.028417, 'checkpointer_blocking_duration_secs': 1.8438470363616943, 'get_old_steps_start_time': 1776911302.8722866, 'get_old_steps_duration_secs': 2.8371810913085938e-05, 'checkpoint_manager_blocking_start_time': 1776911301.0281243, 'checkpoint_manager_blocking_duration_secs': 1.8444678783416748} I0423 02:28:22.872725 123575462741824 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0423 02:28:22.872764 123575462741824 max_utils.py:750] Memstats: After params initialized: I0423 02:28:22.872807 123575462741824 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_0(process=0,(0,0,0,0)) I0423 02:28:22.872831 123575462741824 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_1(process=0,(1,0,0,0)) I0423 02:28:22.872851 123575462741824 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_2(process=0,(0,1,0,0)) I0423 02:28:22.872869 123575462741824 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_3(process=0,(1,1,0,0)) I0423 02:28:22.872887 123575462741824 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_4(process=0,(0,2,0,0)) I0423 02:28:22.872904 123575462741824 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_5(process=0,(1,2,0,0)) I0423 02:28:22.872920 123575462741824 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_6(process=0,(0,3,0,0)) I0423 02:28:22.872938 123575462741824 max_utils.py:756] Using (GB) 1.59 / 31.25 (5.088000%) on TPU_7(process=0,(1,3,0,0)) I0423 02:28:23.112670 123575462741824 metric_logger.py:196] completed step: 0, seconds: 2.459, TFLOP/s/device: 5.524, Tokens/s/device: 832.695, total_weights: 16384, loss: 10.874, lm_loss: 10.874, perplexity: 52770.941 I0423 02:28:23.113642 123575462741824 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/tensorboard/' I0423 02:28:23.229690 123575462741824 metric_logger.py:196] completed step: 1, seconds: 2.201, TFLOP/s/device: 6.173, Tokens/s/device: 930.397, total_weights: 16384, loss: 10.874, lm_loss: 10.874, perplexity: 52770.941 I0423 02:28:23.349058 123575462741824 metric_logger.py:196] completed step: 2, seconds: 0.008, TFLOP/s/device: 1810.410, Tokens/s/device: 272884.744, total_weights: 16384, loss: 10.276, lm_loss: 10.276, perplexity: 29019.973 I0423 02:28:23.467856 123575462741824 metric_logger.py:196] completed step: 3, seconds: 0.117, TFLOP/s/device: 116.342, Tokens/s/device: 17536.349, total_weights: 16384, loss: 9.282, lm_loss: 9.282, perplexity: 10739.224 I0423 02:28:23.473460 123575462741824 checkpointing.py:772] Waiting for step 5 to finish before checkpoint... I0423 02:28:23.600728 123544220468800 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0/items/array_metadatas/process_0 I0423 02:28:23.705492 123575462741824 checkpointing.py:776] Waited 0.2319953441619873 seconds for step 5 to finish before starting checkpointing. I0423 02:28:23.706452 123575462741824 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 02:28:56.875216 123543622780480 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 34.003935s (commit=33.532229s, array_metadata_write=0.471706s) I0423 02:28:56.876452 123543421453888 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 353.510 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 35 seconds) (per-host) I0423 02:28:56.876579 123543421453888 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 34.004384s. I0423 02:28:57.126120 123543421453888 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776911301859394101, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0/_CHECKPOINT_METADATA I0423 02:28:57.346799 123543421453888 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0423 02:28:57.548910 123544209983040 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776911301859394101, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0/_CHECKPOINT_METADATA I0423 02:28:57.740756 123543421453888 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0423 02:28:57.740945 123543421453888 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.573526s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0/items I0423 02:28:57.741724 123543421453888 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0/items I0423 02:28:57.975364 123543421453888 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0 I0423 02:28:58.701143 123543421453888 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0`. I0423 02:28:58.701861 123543421453888 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 37.673432s. directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/0 I0423 02:28:58.701937 123543421453888 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 35.829744s. I0423 02:28:58.702159 123544262411840 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 02:28:58.702286 123544262411840 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0423 02:28:58.702360 123544262411840 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0423 02:28:58.702408 123544262411840 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0423 02:28:58.702521 123575462741824 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. W0423 02:28:58.702588 123575462741824 checkpoint_manager.py:1441] Waiting for previous save to complete took 34.996140 seconds. If this number is high, consider checkpointing less frequently. I0423 02:28:58.703613 123575462741824 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 5 I0423 02:28:58.703906 123575462741824 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5. I0423 02:28:58.878435 123575462741824 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array. I0423 02:28:58.878539 123575462741824 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 I0423 02:28:58.884725 123543421453888 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5 I0423 02:28:59.568223 123544220468800 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5/items I0423 02:29:04.450403 123575462741824 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 5.572397s I0423 02:29:04.454642 123575462741824 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.182 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 5 seconds) (per-host) I0423 02:29:04.454704 123575462741824 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 5.655927s (batch_requests_ready=0.075703s, total_serialization_initiated=5.576105s, others=0.004119s) I0423 02:29:04.454782 123575462741824 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 5.656501s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=5.656486) I0423 02:29:04.456510 123543622780480 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0423 02:29:04.456597 123575462741824 async_checkpointer.py:561] Finished blocking save. Time taken: 5.752942s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5. I0423 02:29:04.456791 123575462741824 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0423 02:29:04.457012 123544040113728 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0423 02:29:04.457149 123575462741824 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776911303.7064269, 'wait_for_prev_duration_secs': 34.99613976478577, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776911338.7036357, 'checkpointer_blocking_duration_secs': 5.753067493438721, 'get_old_steps_start_time': 1776911344.4567208, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776911303.7063591, 'checkpoint_manager_blocking_duration_secs': 40.75076127052307} I0423 02:29:04.457250 123575462741824 checkpointing.py:408] Started an asynchronous checkpoint save for step 5 I0423 02:29:04.457957 123575462741824 metric_logger.py:196] completed step: 4, seconds: 0.119, TFLOP/s/device: 113.844, Tokens/s/device: 17159.758, total_weights: 16384, loss: 8.327, lm_loss: 8.327, perplexity: 4134.812 I0423 02:29:04.466543 123575462741824 metric_logger.py:196] completed step: 5, seconds: 0.119, TFLOP/s/device: 114.199, Tokens/s/device: 17213.266, total_weights: 16384, loss: 7.367, lm_loss: 7.367, perplexity: 1583.522 I0423 02:29:04.583132 123575462741824 metric_logger.py:196] completed step: 6, seconds: 40.991, TFLOP/s/device: 0.331, Tokens/s/device: 49.962, total_weights: 16384, loss: 6.459, lm_loss: 6.459, perplexity: 638.363 I0423 02:29:04.701815 123575462741824 metric_logger.py:196] completed step: 7, seconds: 0.006, TFLOP/s/device: 2117.365, Tokens/s/device: 319152.252, total_weights: 16384, loss: 5.622, lm_loss: 5.622, perplexity: 276.577 I0423 02:29:04.820863 123575462741824 metric_logger.py:196] completed step: 8, seconds: 0.118, TFLOP/s/device: 115.524, Tokens/s/device: 17413.041, total_weights: 16384, loss: 4.864, lm_loss: 4.864, perplexity: 129.523 I0423 02:29:04.938710 123575462741824 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0423 02:29:04.939614 123575462741824 checkpointing.py:776] Waited 0.0009407997131347656 seconds for step 9 to finish before starting checkpointing. I0423 02:29:04.939880 123575462741824 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 02:29:05.176495 123544061085248 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5/items/array_metadatas/process_0 I0423 02:29:34.429426 123544050599488 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 29.974016s (commit=29.529182s, array_metadata_write=0.444834s) I0423 02:29:34.430502 123543622780480 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 354.650 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 35 seconds) (per-host) I0423 02:29:34.430555 123543622780480 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 29.973915s. I0423 02:29:34.928938 123543622780480 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0423 02:29:35.292969 123543622780480 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0423 02:29:35.293177 123543622780480 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.530291s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5/items I0423 02:29:35.293891 123543622780480 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5/items I0423 02:29:35.517066 123543622780480 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5 I0423 02:29:36.218574 123543622780480 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5`. I0423 02:29:36.219309 123543622780480 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 37.515662s. directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/5 I0423 02:29:36.219379 123543622780480 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 31.762740s. I0423 02:29:36.219540 123544040113728 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 02:29:36.219656 123544040113728 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0423 02:29:36.219705 123544040113728 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0423 02:29:36.219743 123544040113728 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0423 02:29:36.219913 123575462741824 checkpoint_manager.py:2006] [process=0][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5. W0423 02:29:36.220035 123575462741824 checkpoint_manager.py:1441] Waiting for previous save to complete took 31.280165 seconds. If this number is high, consider checkpointing less frequently. I0423 02:29:36.220335 123575462741824 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 9 I0423 02:29:36.220632 123575462741824 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9. I0423 02:29:36.387093 123575462741824 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array. I0423 02:29:36.387195 123575462741824 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 I0423 02:29:36.428955 123543622780480 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9 I0423 02:29:37.123260 123544061085248 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9/items I0423 02:29:43.607814 123575462741824 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 7.221189s I0423 02:29:43.613209 123575462741824 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 1.689 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 7 seconds) (per-host) I0423 02:29:43.613282 123575462741824 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 7.306743s (batch_requests_ready=0.077227s, total_serialization_initiated=7.224253s, others=0.005262s) I0423 02:29:43.613370 123575462741824 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 7.307318s (all_items=0.000012s, per_item={'items': '0.00001240'}, temp_paths=7.307306) I0423 02:29:43.614996 123544220468800 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started. I0423 02:29:43.615100 123575462741824 async_checkpointer.py:561] Finished blocking save. Time taken: 7.394722s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9. I0423 02:29:43.615276 123575462741824 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0423 02:29:43.615444 123544040113728 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0423 02:29:43.615573 123575462741824 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776911344.9398553, 'wait_for_prev_duration_secs': 31.280165433883667, 'time_between_consecutive_saves_sec': 6.237433433532715, 'checkpointer_blocking_start_time': 1776911376.2203603, 'checkpointer_blocking_duration_secs': 7.3948445320129395, 'get_old_steps_start_time': 1776911383.6152203, 'get_old_steps_duration_secs': 2.002716064453125e-05, 'checkpoint_manager_blocking_start_time': 1776911344.9398232, 'checkpoint_manager_blocking_duration_secs': 38.67572498321533} I0423 02:29:43.615684 123575462741824 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0423 02:29:43.615716 123575462741824 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 02:29:44.340712 123544262411840 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9/items/array_metadatas/process_0 I0423 02:30:21.887019 123544061085248 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 38.273073s (commit=37.814428s, array_metadata_write=0.458645s) I0423 02:30:21.888133 123544220468800 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 277.235 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 45 seconds) (per-host) I0423 02:30:21.888188 123544220468800 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 38.273043s. I0423 02:30:22.377290 123544220468800 array_metadata_store.py:367] [process=0][thread=async_save] Skipped cross-host ArrayMetadata validation because only one process is found: process_index=0. I0423 02:30:22.791069 123544220468800 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389). I0423 02:30:22.793902 123544220468800 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.606269s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9/items I0423 02:30:22.794680 123544220468800 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9/items I0423 02:30:23.052324 123544220468800 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9 I0423 02:30:23.777635 123544220468800 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9`. I0423 02:30:23.778406 123544220468800 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 47.558035s. directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_16_zarr3_true/checkpoints/9 I0423 02:30:23.778469 123544220468800 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 40.163325s. I0423 02:30:23.778676 123544040113728 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 02:30:23.778801 123544040113728 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0423 02:30:23.778854 123544040113728 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0423 02:30:23.778890 123544040113728 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0423 02:30:23.779022 123575462741824 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. I0423 02:30:23.779165 123575462741824 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 02:30:23.779934 123575462741824 metric_logger.py:196] completed step: 9, seconds: 0.119, TFLOP/s/device: 114.317, Tokens/s/device: 17231.080, total_weights: 16384, loss: 4.189, lm_loss: 4.189, perplexity: 65.979 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops