MaxView

Timing Test Reference Updates
‹ 03_dropoutCase: 04_int805_fp8 ›

Metrics: main (b341212ce) vs main (172d0f10a)

Metricmain  b341212cemain  172d0f10aDiff (main − main)
Parameters1.104 billion1.104 billion—
Final loss8.77408.77400
TFLOP/s109.279111.415+2.136
Tok/s16471.816793.6+321.868
Avg s/step2.4072.761+0.354
Memory %5.125.120
JAX0.8.10.8.1—

Diff = branch value − main value. Green = branch improved. Red = branch regressed.

main  ·  b341212ce  ·  main_20260421_144657  ·  full log 
2026-04-21 14:56:26.145835: 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 00:00:1776783386.155923 1482694 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776783386.159012 1482694 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776783386.168929 1482694 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776783386.168941 1482694 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776783386.168943 1482694 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776783386.168944 1482694 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-21 14:56:29.586228: 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 14:56:29.702314 139847166221440 max_utils.py:238] Skipping jax distributed system due to skip_jax_distributed_system=True flag.
I0421 14:56:55.670389 139847166221440 max_utils.py:800] System Information: Jax Version: 0.8.1
I0421 14:56:55.670576 139847166221440 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0421 14:56:55.670611 139847166221440 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 14:56:55.670643 139847166221440 train_utils.py:335] WARNING: 'dataset_path' might be pointing your local file system
I0421 14:56:55.670758 139847166221440 train.py:703] [DECOUPLED NO-OP] skipping cloud diagnostics wrapper.
I0421 14:56:56.024010 139847166221440 maxtext_utils.py:1551] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 14:56:56.024461 139847166221440 checkpointing.py:677] Setting up checkpoint logger...
I0421 14:56:56.024510 139847166221440 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0421 14:56:56.024558 139847166221440 pytree_checkpoint_handler.py:577] save_device_host_concurrent_bytes=None
I0421 14:56:56.025286 139847166221440 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 0x7f30689a6fc0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 14:56:58.419216 139847166221440 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0421 14:56:58.419428 139847166221440 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 0x7f2ec0daa450>}, handler_registry=None
I0421 14:56:58.419732 139847166221440 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f2ec0daa450>` 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 14:56:58.419777 139847166221440 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f2ec0983290>` 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 14:56:58.419805 139847166221440 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 0x7f2ec0daa450>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f2ec0daa450>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f2ec0983290>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f2ec0983290>}).
I0421 14:56:58.420102 139847166221440 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.28
I0421 14:56:58.420154 139847166221440 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>.<lambda> at 0x7f2ec09a4ea0> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0421 14:56:58.552320 139847166221440 checkpoint_manager.py:1788] Found 0 checkpoint steps in gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints
I0421 14:56:58.552562 139847166221440 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_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f2ec0982fc0>
I0421 14:56:58.552644 139847166221440 checkpointing.py:301] Checkpoint manager created!
I0421 14:56:58.915533 139847166221440 dataset_info.py:707] Load dataset info from tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0
I0421 14:56:58.918560 139847166221440 reader.py:262] Creating a tf.data.Dataset reading 8 files located in folders: tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0.
I0421 14:56:58.972261 139847166221440 logging_logger.py:49] Constructing tf.data.Dataset __local_c4_builder for split train, from tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0
I0421 14:56:58.994776 139847166221440 tokenizer.py:245] Tokenizer path: src/maxtext/assets/tokenizers/tokenizer.llama2
I0421 14:56:58.994837 139847166221440 tokenizer.py:187] Loading sentencepiece tokenizer: src/maxtext/assets/tokenizers/tokenizer.llama2
I0421 14:56:59.841967 139847166221440 nnx_wrappers.py:437] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 14:56:59.842081 139847166221440 nnx_wrappers.py:437] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None).
I0421 14:57:00.142668 139847166221440 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 14:57:00.142816 139847166221440 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None).
I0421 14:57:00.155499 139847166221440 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 14:57:00.155551 139847166221440 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None).
I0421 14:57:00.220808 139847166221440 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 14:57:00.220890 139847166221440 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None).
I0421 14:57:00.233599 139847166221440 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 14:57:00.233653 139847166221440 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None).
I0421 14:57:00.246192 139847166221440 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 14:57:00.246245 139847166221440 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None).
I0421 14:57:00.265899 139847166221440 attentions.py:1197] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 14:57:00.265960 139847166221440 attentions.py:1197] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None).
I0421 14:57:00.332506 139847166221440 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 14:57:00.332582 139847166221440 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, None).
I0421 14:57:01.098307 139847166221440 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 14:57:01.098414 139847166221440 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
I0421 14:57:03.450275 139847166221440 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0421 14:57:03.450389 139847166221440 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 14:57:03.450432 139847166221440 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 14:57:03.450475 139847166221440 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   PartitionSpec('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0421 14:57:03.450515 139847166221440 maxtext_utils.py:1654]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0421 14:57:03.450544 139847166221440 maxtext_utils.py:1654]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0421 14:57:03.450583 139847166221440 maxtext_utils.py:1654]  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 14:57:03.450621 139847166221440 maxtext_utils.py:1654]  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 14:57:03.450649 139847166221440 maxtext_utils.py:1654]  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 14:57:03.450674 139847166221440 maxtext_utils.py:1654]  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 14:57:03.450711 139847166221440 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0421 14:57:03.450746 139847166221440 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0421 14:57:05.195523 139847166221440 train.py:155] train/xent Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length').
I0421 14:57:05.195623 139847166221440 train.py:155] train/xent Physical: float32[8,2048]............................................. ('fsdp', None).
I0421 14:57:05.207661 139847166221440 train.py:162] train/z_loss Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length').
I0421 14:57:05.207714 139847166221440 train.py:162] train/z_loss Physical: float32[8,2048]............................................. ('fsdp', None).
I0421 14:57:21.053590 139847166221440 max_utils.py:791] Total memory size: 3.7 GB, Output size: 1.5 GB, Temp size: 2.2 GB, Argument size: 1.5 GB, Host temp size: 0.0 GB.
I0421 14:57:21.054398 139847166221440 max_utils.py:194] tensorboardX not available; using no-op SummaryWriter.
I0421 14:57:21.054611 139847166221440 metric_logger.py:301] number parameters: 1.104 billion
I0421 14:57:41.376555 139847166221440 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0421 14:57:41.518123 139847166221440 checkpointing.py:776] Waited 0.14155936241149902 seconds for step 0 to finish before starting checkpointing.
I0421 14:57:41.518847 139847166221440 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 14:57:41.519030 139847166221440 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 0
I0421 14:57:41.519561 139847166221440 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0.
I0421 14:57:41.598514 139847166221440 signaling_client.py:373] Using ThreadSafeKeyValueSignalingClient
I0421 14:57:41.691202 139755389978176 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0
I0421 14:57:41.692060 139847166221440 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array.
I0421 14:57:41.692231 139847166221440 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 14:57:43.256523 139755379492416 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0/items
I0421 14:57:43.401550 139755211720256 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776783463119944461, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776783463119944461, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0/_CHECKPOINT_METADATA
I0421 14:57:43.557327 139847166221440 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 1.866452s
I0421 14:57:43.557795 139847166221440 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 6.302 GiB/s (total gbytes: 12.3 GiB) (time elapsed: a second) (per-host)
I0421 14:57:43.557852 139847166221440 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 1.958206s (batch_requests_ready=0.087639s, total_serialization_initiated=1.870205s, others=0.000361s)
I0421 14:57:43.557912 139847166221440 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 1.958837s (all_items=0.000029s, per_item={'items': '0.00002933'}, temp_paths=1.958808)
I0421 14:57:43.558828 139755190748736 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0421 14:57:43.558936 139847166221440 async_checkpointer.py:561] Finished blocking save. Time taken: 2.039837s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0.
I0421 14:57:43.559136 139847166221440 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 14:57:43.559366 139755180262976 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0421 14:57:43.559482 139847166221440 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776783461.5188327, 'wait_for_prev_duration_secs': 4.601478576660156e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776783461.5190709, 'checkpointer_blocking_duration_secs': 2.0399935245513916, 'get_old_steps_start_time': 1776783463.559079, 'get_old_steps_duration_secs': 2.2172927856445312e-05, 'checkpoint_manager_blocking_start_time': 1776783461.5187244, 'checkpoint_manager_blocking_duration_secs': 2.0407307147979736}
I0421 14:57:43.559666 139847166221440 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0421 14:57:43.559706 139847166221440 max_utils.py:750] 
Memstats: After params initialized:
I0421 14:57:43.559796 139847166221440 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_0(process=0,(0,0,0,0))
I0421 14:57:43.559829 139847166221440 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_1(process=0,(1,0,0,0))
I0421 14:57:43.559851 139847166221440 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_2(process=0,(0,1,0,0))
I0421 14:57:43.559869 139847166221440 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_3(process=0,(1,1,0,0))
I0421 14:57:43.559886 139847166221440 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_4(process=0,(0,2,0,0))
I0421 14:57:43.559904 139847166221440 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_5(process=0,(1,2,0,0))
I0421 14:57:43.559921 139847166221440 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_6(process=0,(0,3,0,0))
I0421 14:57:43.559938 139847166221440 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_7(process=0,(1,3,0,0))
I0421 14:57:43.716119 1486228 google_auth_provider.cc:149] Using credentials at ~/.config/gcloud/application_default_credentials.json
I0421 14:57:43.716189 1486228 google_auth_provider.cc:156] Using OAuth2 AuthProvider
I0421 14:57:43.974198 139847166221440 metric_logger.py:196] completed step: 0, seconds: 20.321, TFLOP/s/device: 0.669, Tokens/s/device: 100.783, total_weights: 13328, loss: 10.840, lm_loss: 10.840, perplexity: 51025.957
I0421 14:57:43.975129 139847166221440 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/tensorboard/'
I0421 14:57:44.093073 139847166221440 metric_logger.py:196] completed step: 1, seconds: 2.595, TFLOP/s/device: 5.235, Tokens/s/device: 789.108, total_weights: 12332, loss: 10.869, lm_loss: 10.869, perplexity: 52515.969
I0421 14:57:44.214453 139847166221440 metric_logger.py:196] completed step: 2, seconds: 0.011, TFLOP/s/device: 1260.635, Tokens/s/device: 190016.701, total_weights: 15161, loss: 9.874, lm_loss: 9.874, perplexity: 19421.770
I0421 14:57:44.335500 139847166221440 metric_logger.py:196] completed step: 3, seconds: 0.121, TFLOP/s/device: 112.466, Tokens/s/device: 16952.099, total_weights: 13327, loss: 9.406, lm_loss: 9.406, perplexity: 12166.079
I0421 14:58:02.759711 139755389978176 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0/items/array_metadatas/process_0
I0421 14:58:02.760690 139847166221440 metric_logger.py:196] completed step: 4, seconds: 0.121, TFLOP/s/device: 112.064, Tokens/s/device: 16891.558, total_weights: 11939, loss: 9.149, lm_loss: 9.149, perplexity: 9403.998
I0421 14:58:02.788460 139847166221440 metric_logger.py:196] completed step: 5, seconds: 0.121, TFLOP/s/device: 112.039, Tokens/s/device: 16887.797, total_weights: 15502, loss: 9.058, lm_loss: 9.058, perplexity: 8587.564
I0421 14:58:02.908335 139847166221440 metric_logger.py:196] completed step: 6, seconds: 18.441, TFLOP/s/device: 0.737, Tokens/s/device: 111.057, total_weights: 13864, loss: 8.892, lm_loss: 8.892, perplexity: 7274.692
I0421 14:58:03.030149 139847166221440 metric_logger.py:196] completed step: 7, seconds: 0.009, TFLOP/s/device: 1525.273, Tokens/s/device: 229905.703, total_weights: 12988, loss: 8.751, lm_loss: 8.751, perplexity: 6314.503
I0421 14:58:03.152361 139847166221440 metric_logger.py:196] completed step: 8, seconds: 0.121, TFLOP/s/device: 112.092, Tokens/s/device: 16895.738, total_weights: 13820, loss: 8.791, lm_loss: 8.791, perplexity: 6573.798
I0421 14:58:03.273216 139847166221440 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0421 14:58:03.274688 139847166221440 checkpointing.py:776] Waited 0.0014448165893554688 seconds for step 9 to finish before starting checkpointing.
I0421 14:58:03.275284 139847166221440 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 14:58:30.397371 139755201234496 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 46.686020s (commit=46.209076s, array_metadata_write=0.476943s)
I0421 14:58:30.398674 139755190748736 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 258.956 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 48 seconds) (per-host)
I0421 14:58:30.398785 139755190748736 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 46.839803s.
I0421 14:58:30.688615 139755190748736 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776783463119944461, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0/_CHECKPOINT_METADATA
I0421 14:58:30.882510 139755190748736 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 14:58:31.073186 139755211720256 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776783463119944461, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0/_CHECKPOINT_METADATA
I0421 14:58:31.273030 139755190748736 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389).
I0421 14:58:31.273719 139755190748736 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.541075s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0/items
I0421 14:58:31.274453 139755190748736 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0/items
I0421 14:58:31.509359 139755190748736 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0
I0421 14:58:32.173053 139755190748736 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0`.
I0421 14:58:32.173798 139755190748736 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 50.654706s. directory=gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/0
I0421 14:58:32.173883 139755190748736 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 48.614902s.
I0421 14:58:32.174074 139755180262976 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 14:58:32.174192 139755180262976 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0421 14:58:32.174251 139755180262976 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 14:58:32.174300 139755180262976 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 14:58:32.174428 139847166221440 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 14:58:32.174566 139847166221440 checkpoint_manager.py:1441] Waiting for previous save to complete took 28.899304 seconds. If this number is high, consider checkpointing less frequently.
I0421 14:58:32.175602 139847166221440 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 9
I0421 14:58:32.175922 139847166221440 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9.
I0421 14:58:32.348457 139755180262976 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9
I0421 14:58:32.354729 139847166221440 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array.
I0421 14:58:32.354836 139847166221440 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 14:58:33.081053 139755159291456 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9/items
I0421 14:58:43.290079 139847166221440 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 10.935769s
I0421 14:58:43.295006 139847166221440 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 1.119 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 11 seconds) (per-host)
I0421 14:58:43.295086 139847166221440 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 11.030595s (batch_requests_ready=0.086656s, total_serialization_initiated=10.939131s, others=0.004808s)
I0421 14:58:43.295186 139847166221440 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 11.031214s (all_items=0.000021s, per_item={'items': '0.00002098'}, temp_paths=11.031193)
I0421 14:58:43.296709 139755180262976 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0421 14:58:43.296796 139847166221440 async_checkpointer.py:561] Finished blocking save. Time taken: 11.121149s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9.
I0421 14:58:43.297013 139847166221440 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 14:58:43.297311 139755190748736 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0421 14:58:43.297447 139847166221440 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776783483.275231, 'wait_for_prev_duration_secs': 28.899303674697876, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776783512.1756258, 'checkpointer_blocking_duration_secs': 11.121283531188965, 'get_old_steps_start_time': 1776783523.2969313, 'get_old_steps_duration_secs': 3.886222839355469e-05, 'checkpoint_manager_blocking_start_time': 1776783483.2751677, 'checkpoint_manager_blocking_duration_secs': 40.02225303649902}
I0421 14:58:43.297613 139847166221440 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0421 14:58:43.297649 139847166221440 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 14:58:44.049566 139755389978176 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9/items/array_metadatas/process_0
I0421 14:59:18.715035 139755295606336 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 35.419255s (commit=34.997578s, array_metadata_write=0.421677s)
I0421 14:59:18.716207 139755180262976 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 272.041 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 46 seconds) (per-host)
I0421 14:59:18.716261 139755180262976 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 35.419423s.
I0421 14:59:19.112247 139755180262976 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 14:59:19.509519 139755180262976 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389).
I0421 14:59:19.510263 139755180262976 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.547407s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9/items
I0421 14:59:19.510987 139755180262976 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9/items
I0421 14:59:19.771556 139755180262976 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9
I0421 14:59:20.424469 139755180262976 atomicity.py:794] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9`.
I0421 14:59:20.425232 139755180262976 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 48.249592s. directory=gs://wanglance-maxtext/linen_ckpt_main_20260421_144657/linen_main_20260421_144657_04_int8/checkpoints/9
I0421 14:59:20.425329 139755180262976 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 37.128490s.
I0421 14:59:20.425521 139755190748736 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 14:59:20.425647 139755190748736 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0421 14:59:20.425718 139755190748736 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0421 14:59:20.425761 139755190748736 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0421 14:59:20.425934 139847166221440 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 14:59:20.426107 139847166221440 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 14:59:20.426985 139847166221440 metric_logger.py:196] completed step: 9, seconds: 0.124, TFLOP/s/device: 109.279, Tokens/s/device: 16471.762, total_weights: 12300, loss: 8.774, lm_loss: 8.774, perplexity: 6465.313
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
main  ·  172d0f10a  ·  main_20260423_012248  ·  full log 
2026-04-23 01:29:54.982893: 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 00:00:1776907794.995914 2265886 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776907794.999743 2265886 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776907795.011254 2265886 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776907795.011270 2265886 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776907795.011272 2265886 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776907795.011274 2265886 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 01:29:58.686375: 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 01:29:58.822586 138271370295104 max_utils.py:238] Skipping jax distributed system due to skip_jax_distributed_system=True flag.
I0423 01:30:30.938131 138271370295104 max_utils.py:800] System Information: Jax Version: 0.8.1
I0423 01:30:30.938414 138271370295104 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0423 01:30:30.938466 138271370295104 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 01:30:30.938498 138271370295104 train_utils.py:348] WARNING: 'dataset_path' might be pointing your local file system
I0423 01:30:30.938684 138271370295104 train.py:703] [DECOUPLED NO-OP] skipping cloud diagnostics wrapper.
I0423 01:30:31.600298 138271370295104 maxtext_utils.py:1604] Num_devices: 8, shape (1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 01:30:31.600677 138271370295104 checkpointing.py:677] Setting up checkpoint logger...
I0423 01:30:31.600724 138271370295104 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0423 01:30:31.600761 138271370295104 pytree_checkpoint_handler.py:577] save_device_host_concurrent_bytes=None
I0423 01:30:31.601217 138271370295104 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 0x7dc1865bb110>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0423 01:30:34.001127 138271370295104 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0423 01:30:34.001506 138271370295104 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 0x7dbfb0101940>}, handler_registry=None
I0423 01:30:34.001752 138271370295104 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7dbfb0101940>` 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 01:30:34.001795 138271370295104 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dbfb0101f40>` 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 01:30:34.001825 138271370295104 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 0x7dbfb0101940>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7dbfb0101940>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dbfb0101f40>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dbfb0101f40>}).
I0423 01:30:34.002125 138271370295104 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.28
I0423 01:30:34.002177 138271370295104 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>.<lambda> at 0x7dbfb0110540> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0423 01:30:34.135480 138271370295104 checkpoint_manager.py:1788] Found 0 checkpoint steps in gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints
I0423 01:30:34.135710 138271370295104 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_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7dc19ff4bf80>
I0423 01:30:34.135992 138271370295104 checkpointing.py:301] Checkpoint manager created!
I0423 01:30:34.214149 138271370295104 dataset_info.py:707] Load dataset info from tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0
I0423 01:30:34.217183 138271370295104 reader.py:262] Creating a tf.data.Dataset reading 8 files located in folders: tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0.
I0423 01:30:34.276832 138271370295104 logging_logger.py:49] Constructing tf.data.Dataset __local_c4_builder for split train, from tests/assets/local_datasets/c4_en_dataset_minimal/c4/en/3.1.0
I0423 01:30:34.299800 138271370295104 tokenizer.py:245] Tokenizer path: src/maxtext/assets/tokenizers/tokenizer.llama2
I0423 01:30:34.299866 138271370295104 tokenizer.py:187] Loading sentencepiece tokenizer: src/maxtext/assets/tokenizers/tokenizer.llama2
I0423 01:30:35.160907 138271370295104 nnx_wrappers.py:437] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0423 01:30:35.161019 138271370295104 nnx_wrappers.py:437] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None).
I0423 01:30:35.464904 138271370295104 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 01:30:35.464999 138271370295104 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None).
I0423 01:30:35.477925 138271370295104 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 01:30:35.477982 138271370295104 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, None).
I0423 01:30:35.544891 138271370295104 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 01:30:35.544991 138271370295104 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None).
I0423 01:30:35.558003 138271370295104 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 01:30:35.558070 138271370295104 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None).
I0423 01:30:35.570972 138271370295104 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 01:30:35.571025 138271370295104 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None).
I0423 01:30:35.617683 138271370295104 attentions.py:1198] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0423 01:30:35.617824 138271370295104 attentions.py:1198] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, None, None).
I0423 01:30:35.690109 138271370295104 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0423 01:30:35.690190 138271370295104 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, None).
I0423 01:30:36.496059 138271370295104 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0423 01:30:36.496165 138271370295104 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 01:30:37.781165 138271370295104 maxtext_utils.py:1707]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0423 01:30:37.781289 138271370295104 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 01:30:37.781333 138271370295104 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 01:30:37.781379 138271370295104 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 01:30:37.781422 138271370295104 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 01:30:37.781451 138271370295104 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 01:30:37.781491 138271370295104 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 01:30:37.781533 138271370295104 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 01:30:37.781563 138271370295104 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 01:30:37.781591 138271370295104 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 01:30:37.781628 138271370295104 maxtext_utils.py:1707]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0423 01:30:37.781665 138271370295104 maxtext_utils.py:1707]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0423 01:30:39.555738 138271370295104 train.py:155] train/xent Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length').
I0423 01:30:39.555830 138271370295104 train.py:155] train/xent Physical: float32[8,2048]............................................. ('fsdp', None).
I0423 01:30:39.568155 138271370295104 train.py:162] train/z_loss Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length').
I0423 01:30:39.568209 138271370295104 train.py:162] train/z_loss Physical: float32[8,2048]............................................. ('fsdp', None).
I0423 01:30:41.605844 138271370295104 max_utils.py:791] Total memory size: 3.7 GB, Output size: 1.5 GB, Temp size: 2.2 GB, Argument size: 1.5 GB, Host temp size: 0.0 GB.
I0423 01:30:41.606693 138271370295104 max_utils.py:194] tensorboardX not available; using no-op SummaryWriter.
I0423 01:30:41.606859 138271370295104 metric_logger.py:301] number parameters: 1.104 billion
I0423 01:30:48.291800 138271370295104 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0423 01:30:48.420843 138271370295104 checkpointing.py:776] Waited 0.12910151481628418 seconds for step 0 to finish before starting checkpointing.
I0423 01:30:48.421967 138271370295104 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 01:30:48.422266 138271370295104 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 0
I0423 01:30:48.423128 138271370295104 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0.
I0423 01:30:48.509599 138271370295104 signaling_client.py:373] Using ThreadSafeKeyValueSignalingClient
I0423 01:30:48.602914 138271370295104 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array.
I0423 01:30:48.603098 138271370295104 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 01:30:48.610949 138143728666176 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0
I0423 01:30:49.341102 138143718180416 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0/items
I0423 01:30:49.480873 138143686723136 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776907849247808663, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776907849247808663, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0/_CHECKPOINT_METADATA
I0423 01:30:49.803727 2268521 google_auth_provider.cc:149] Using credentials at ~/.config/gcloud/application_default_credentials.json
I0423 01:30:49.803808 2268521 google_auth_provider.cc:156] Using OAuth2 AuthProvider
I0423 01:30:51.083353 138271370295104 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 2.481068s
I0423 01:30:51.084091 138271370295104 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.796 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 2 seconds) (per-host)
I0423 01:30:51.084164 138271370295104 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 2.573348s (batch_requests_ready=0.087513s, total_serialization_initiated=2.485202s, others=0.000633s)
I0423 01:30:51.084245 138271370295104 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 2.574034s (all_items=0.000043s, per_item={'items': '0.00004339'}, temp_paths=2.573991)
I0423 01:30:51.089827 138144078890560 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0423 01:30:51.089957 138271370295104 async_checkpointer.py:561] Finished blocking save. Time taken: 2.667637s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0.
I0423 01:30:51.090243 138271370295104 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 01:30:51.090577 138142887708224 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0423 01:30:51.090705 138271370295104 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776907848.421943, 'wait_for_prev_duration_secs': 5.626678466796875e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776907848.4222898, 'checkpointer_blocking_duration_secs': 2.6678452491760254, 'get_old_steps_start_time': 1776907851.090157, 'get_old_steps_duration_secs': 4.267692565917969e-05, 'checkpoint_manager_blocking_start_time': 1776907848.4217026, 'checkpoint_manager_blocking_duration_secs': 2.6689741611480713}
I0423 01:30:51.090834 138271370295104 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0423 01:30:51.090900 138271370295104 max_utils.py:750] 
Memstats: After params initialized:
I0423 01:30:51.090955 138271370295104 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_0(process=0,(0,0,0,0))
I0423 01:30:51.090988 138271370295104 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_1(process=0,(1,0,0,0))
I0423 01:30:51.091011 138271370295104 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_2(process=0,(0,1,0,0))
I0423 01:30:51.091028 138271370295104 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_3(process=0,(1,1,0,0))
I0423 01:30:51.091064 138271370295104 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_4(process=0,(0,2,0,0))
I0423 01:30:51.091083 138271370295104 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_5(process=0,(1,2,0,0))
I0423 01:30:51.091099 138271370295104 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_6(process=0,(0,3,0,0))
I0423 01:30:51.091117 138271370295104 max_utils.py:756] 	Using (GB) 1.6 / 31.25 (5.120000%) on TPU_7(process=0,(1,3,0,0))
I0423 01:30:51.466205 138271370295104 metric_logger.py:196] completed step: 0, seconds: 6.684, TFLOP/s/device: 2.033, Tokens/s/device: 306.391, total_weights: 13328, loss: 10.840, lm_loss: 10.840, perplexity: 51025.957
I0423 01:30:51.468384 138271370295104 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/tensorboard/'
I0423 01:30:51.584585 138271370295104 metric_logger.py:196] completed step: 1, seconds: 3.172, TFLOP/s/device: 4.284, Tokens/s/device: 645.729, total_weights: 12332, loss: 10.869, lm_loss: 10.869, perplexity: 52515.969
I0423 01:30:51.705591 138271370295104 metric_logger.py:196] completed step: 2, seconds: 0.012, TFLOP/s/device: 1098.216, Tokens/s/device: 165535.079, total_weights: 15161, loss: 9.874, lm_loss: 9.874, perplexity: 19421.770
I0423 01:30:51.823293 138143697208896 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_04_int8/checkpoints/0/items/array_metadatas/process_0
I0423 01:30:51.826754 138271370295104 metric_logger.py:196] completed step: 3, seconds: 0.119, TFLOP/s/device: 114.511, Tokens/s/device: 17260.415, total_weights: 13327, loss: 9.406, lm_loss: 9.406, perplexity: 12166.079
I0423 01:31:12.880112 138271370295104 metric_logger.py:196] completed step: 4, seconds: 0.121, TFLOP/s/device: 112.485, Tokens/s/device: 16954.906, total_weights: 11939, loss: 9.149, lm_loss: 9.149, perplexity: 9403.998
I0423 01:31:12.892339 138271370295104 metric_logger.py:196] completed step: 5, seconds: 0.121, TFLOP/s/device: 112.364, Tokens/s/device: 16936.678, total_weights: 15502, loss: 9.058, lm_loss: 9.058, perplexity: 8587.564
I0423 01:31:13.012173 138271370295104 metric_logger.py:196] completed step: 6, seconds: 21.055, TFLOP/s/device: 0.645, Tokens/s/device: 97.269, total_weights: 13864, loss: 8.892, lm_loss: 8.892, perplexity: 7274.692
I0423 01:31:13.133987 138271370295104 metric_logger.py:196] completed step: 7, seconds: 0.008, TFLOP/s/device: 1729.082, Tokens/s/device: 260626.114, total_weights: 12988, loss: 8.751, lm_loss: 8.751, perplexity: 6314.503
I0423 01:31:13.255376 138271370295104 metric_logger.py:196] completed step: 8, seconds: 0.121, TFLOP/s/device: 112.603, Tokens/s/device: 16972.751, total_weights: 13820, loss: 8.791, lm_loss: 8.791, perplexity: 6573.798
I0423 01:31:13.376469 138271370295104 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0423 01:31:13.377474 138271370295104 checkpointing.py:776] Waited 0.0010411739349365234 seconds for step 9 to finish before starting checkpointing.
I0423 01:31:13.377818 138271370295104 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 01:31:19.615498 138143212766784 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 28.526173s (commit=27.998119s, array_metadata_write=0.528054s)
I0423 01:31:19.616672 138144078890560 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 406.252 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 31 seconds) (per-host)
I0423 01:31:19.616798 138144078890560 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 28.526787s.
I0423 01:31:19.856575 138144078890560 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776907849247808663, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0/_CHECKPOINT_METADATA
I0423 01:31:20.104472 138144078890560 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 01:31:20.300245 138143686723136 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776907849247808663, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0/_CHECKPOINT_METADATA
I0423 01:31:20.457788 138144078890560 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389).
I0423 01:31:20.457984 138144078890560 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.560290s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0/items
I0423 01:31:20.458820 138144078890560 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0/items
I0423 01:31:20.698175 138144078890560 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0
I0423 01:31:21.390166 138144078890560 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_04_int8/checkpoints/0`.
I0423 01:31:21.390911 138144078890560 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 32.968598s. directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/0
I0423 01:31:21.390999 138144078890560 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 30.300992s.
I0423 01:31:21.391262 138142887708224 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 01:31:21.391394 138142887708224 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0423 01:31:21.391464 138142887708224 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0423 01:31:21.391518 138142887708224 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0423 01:31:21.391634 138271370295104 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 01:31:21.391713 138271370295104 checkpoint_manager.py:1441] Waiting for previous save to complete took 8.013936 seconds. If this number is high, consider checkpointing less frequently.
I0423 01:31:21.392844 138271370295104 checkpoint_manager.py:1501] [process=0] Saving checkpoint at step 9
I0423 01:31:21.393131 138271370295104 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/9.
I0423 01:31:21.572162 138271370295104 jax_array_handlers.py:347] Scheduling D2H of 39 prioritized jax.Array.
I0423 01:31:21.572268 138271370295104 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 01:31:21.579972 138144078890560 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/9
I0423 01:31:22.271545 138143697208896 atomicity.py:137] Creating tmp directory gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/9/items
I0423 01:31:27.203591 138271370295104 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 5.631877s
I0423 01:31:27.208406 138271370295104 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.156 GiB/s (total gbytes: 12.3 GiB) (time elapsed: 5 seconds) (per-host)
I0423 01:31:27.208710 138271370295104 base_pytree_checkpoint_handler.py:732] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 5.723809s (batch_requests_ready=0.083699s, total_serialization_initiated=5.635201s, others=0.004909s)
I0423 01:31:27.208825 138271370295104 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 5.724429s (all_items=0.000035s, per_item={'items': '0.00003505'}, temp_paths=5.724394)
I0423 01:31:27.210312 138143357470272 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0423 01:31:27.210400 138271370295104 async_checkpointer.py:561] Finished blocking save. Time taken: 5.817509s. Continuing background save to gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/9.
I0423 01:31:27.210613 138271370295104 checkpoint_manager.py:1549] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 01:31:27.210833 138142887708224 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0423 01:31:27.210971 138271370295104 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776907873.3777525, 'wait_for_prev_duration_secs': 8.013935565948486, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776907881.3928702, 'checkpointer_blocking_duration_secs': 5.817642688751221, 'get_old_steps_start_time': 1776907887.2105312, 'get_old_steps_duration_secs': 4.100799560546875e-05, 'checkpoint_manager_blocking_start_time': 1776907873.377695, 'checkpoint_manager_blocking_duration_secs': 13.833244323730469}
I0423 01:31:27.211133 138271370295104 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0423 01:31:27.211172 138271370295104 checkpoint_manager.py:1994] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 01:31:27.964764 138254722532928 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_04_int8/checkpoints/9/items/array_metadatas/process_0
I0423 01:32:07.045681 138143697208896 base_pytree_checkpoint_handler.py:1217] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 39.836457s (commit=39.336436s, array_metadata_write=0.500022s)
I0423 01:32:07.046759 138143357470272 base_pytree_checkpoint_handler.py:128] [process=0] /jax/checkpoint/write/gbytes_per_sec: 277.355 MiB/s (total gbytes: 12.3 GiB) (time elapsed: 45 seconds) (per-host)
I0423 01:32:07.046816 138143357470272 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 39.836371s.
I0423 01:32:07.524817 138143357470272 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 01:32:07.903451 138143357470272 ocdbt_utils.py:56] Param validation support for Zarr3 will be added later (b/362328389).
I0423 01:32:07.903640 138143357470272 base_pytree_checkpoint_handler.py:1342] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 0.547645s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/9/items
I0423 01:32:07.904376 138143357470272 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/9/items
I0423 01:32:08.156528 138143357470272 atomicity.py:608] Finalizing gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/9
I0423 01:32:08.895942 138143357470272 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_04_int8/checkpoints/9`.
I0423 01:32:08.896702 138143357470272 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 47.503817s. directory=gs://wanglance-maxtext/linen_ckpt_main_20260423_012248/linen_main_20260423_012248_04_int8/checkpoints/9
I0423 01:32:08.896780 138143357470272 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 41.686336s.
I0423 01:32:08.896935 138142887708224 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 01:32:08.897064 138142887708224 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0423 01:32:08.897131 138142887708224 checkpoint_manager.py:2103] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0423 01:32:08.897172 138142887708224 checkpoint_manager.py:2112] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0423 01:32:08.897340 138271370295104 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 01:32:08.897490 138271370295104 checkpoint_manager.py:1983] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 01:32:08.898451 138271370295104 metric_logger.py:196] completed step: 9, seconds: 0.122, TFLOP/s/device: 111.415, Tokens/s/device: 16793.630, total_weights: 12300, loss: 8.774, lm_loss: 8.774, perplexity: 6465.313
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops