MaxView

Timing Test Reference Updates
‹ 14_async_ckpt_false_saveCase: 15_ocdbt_false_resume15_ocdbt_false_save ›

Metrics: main (59e0f1759) vs test/pipeline-scan-nnx (5b21b66fc)

Metricmain  59e0f1759test/pipeline-scan-nnx  5b21b66fcDiff (test/pipeline-scan-nnx − main)
Parameters1.104 billion1.104 billion—
Final loss5.39105.39100
TFLOP/s92.26191.878-0.383
Tok/s13906.513848.9-57.645
Avg s/step4.9355.417+0.482
Memory %1.381.380
JAX0.9.20.9.2—

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

main  ·  59e0f1759  ·  main_20260425_071456  ·  full log 
XPK Start: Sat Apr 25 08:21:01 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
`rope_parameters`'s factor field must be a float >= 1, got 40
`rope_parameters`'s beta_fast field must be a float, got 32
`rope_parameters`'s beta_slow field must be a float, got 1
DeepseekV32Config got `key=rope_scaling` in kwargs but hasn't set it as attribute. For RoPE standardization you need to set `self.rope_parameters` in model's config. 
2026-04-25 08:21:26.430239: 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)
I0425 08:21:26.638729 135425501923136 max_utils.py:273] Attempting to initialize the jax distributed system...
I0425 08:21:35.679386 135425501923136 distributed.py:149] Starting JAX distributed service on [::]:8482
I0425 08:21:35.681872 135425501923136 distributed.py:172] Connecting to JAX distributed service on mt-15-ocdbt-false-rs-up2qb-slice-job-0-0.mt-15-ocdbt-false-rs-up2qb:8482
I0425 08:21:36.739534 135425501923136 max_utils.py:284] Jax distributed system initialized!
I0425 08:21:42.921614 135425501923136 max_utils.py:800] System Information: Jax Version: 0.9.2
I0425 08:21:42.921723 135425501923136 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0425 08:21:42.921764 135425501923136 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365
I0425 08:21:42.921800 135425501923136 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0425 08:21:43.621895 135425501923136 maxtext_utils.py:1604] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1)
I0425 08:21:43.622196 135425501923136 checkpointing.py:677] Setting up checkpoint logger...
I0425 08:21:43.622252 135425501923136 checkpointing.py:233] Creating checkpoint manager with ocdbt=False and zarr3=True
I0425 08:21:43.622298 135425501923136 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0425 08:21:43.622655 135425501923136 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=False, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7b2aa2f180b0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0425 08:21:44.950059 135425501923136 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0425 08:21:44.950330 135425501923136 checkpoint_manager.py:708] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b16142b4c80>}, handler_registry=None
I0425 08:21:44.950569 135425501923136 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b16142b4c80>` 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`.
I0425 08:21:44.950620 135425501923136 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b16142bce30>` 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`.
I0425 08:21:44.950658 135425501923136 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 0x7b16142b4c80>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b16142b4c80>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b16142bce30>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b16142bce30>}).
I0425 08:21:44.950983 135425501923136 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0425 08:21:44.951052 135425501923136 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b15887a5800> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0425 08:21:46.854681 135302811219712 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1777105149312405739, 'commit_timestamp_nsecs': 1777105162536042327, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/5/_CHECKPOINT_METADATA
I0425 08:21:47.101351 135302802827008 checkpoint_manager.py:1871] Missing metrics for step 9
I0425 08:21:47.105781 135425501923136 checkpoint_manager.py:1812] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints
I0425 08:21:47.549004 135425501923136 checkpoint_manager.py:929] [process=6][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=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, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b16142b5970>
I0425 08:21:47.549226 135425501923136 checkpointing.py:301] Checkpoint manager created!
I0425 08:21:48.478007 135425501923136 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0425 08:21:48.478146 135425501923136 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 08:21:48.865483 135425501923136 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch_attn', 'activation_length_attn', 'activation_embed_attn').
I0425 08:21:48.865576 135425501923136 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 08:21:48.882128 135425501923136 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch_attn', 'activation_length_attn', 'activation_embed_attn').
I0425 08:21:48.882189 135425501923136 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 08:21:48.906154 135425501923136 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_length_attn', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 08:21:48.906224 135425501923136 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 08:21:48.922989 135425501923136 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_length_attn', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 08:21:48.923053 135425501923136 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 08:21:48.939547 135425501923136 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_length_attn', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 08:21:48.939609 135425501923136 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 08:21:48.964768 135425501923136 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch_attn', 'activation_length_attn', 'activation_heads', 'activation_kv').
I0425 08:21:48.964841 135425501923136 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 08:21:48.986213 135425501923136 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0425 08:21:48.986277 135425501923136 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0425 08:21:49.196198 135425501923136 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0425 08:21:49.196309 135425501923136 checkpointing.py:581] restoring from this run's directory step 9
I0425 08:21:49.433411 135425501923136 event_tracking.py:70] [process=6] [sync] Started load checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/9.
I0425 08:21:49.672085 135425501923136 checkpointer.py:307] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/9.
I0425 08:21:49.672570 135425501923136 event_tracking.py:125] [process=6] [sync] Finished blocking load in 0.24 seconds. Continuing load @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/9.
I0425 08:21:52.393080    1499 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0425 08:22:01.382524 135425501923136 jax_array_handlers.py:843] [process=6] /jax/orbax/read/worker/io/requested throughput: 155.539 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.159993171691895 s) (per-host)
I0425 08:22:01.390771 135425501923136 base_pytree_checkpoint_handler.py:130] [process=6] /jax/checkpoint/read/gbytes_per_sec: 149.671 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.573837995529175 s) (per-host)
I0425 08:22:01.392780 135425501923136 event_tracking.py:138] [process=6] [sync] Finished load in 11.96 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/9
I0425 08:22:01.392876 135425501923136 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints', 'checkpointer_start_time': 1777105309.4333105, 'checkpointer_duration_secs': 11.959538459777832, 'checkpoint_manager_start_time': 1777105309.196564, 'checkpoint_manager_duration_secs': 12.196287155151367}
fsdp: 32
I0425 08:22:01.809212 135425501923136 maxtext_utils.py:1707]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0425 08:22:01.809348 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 08:22:01.809401 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 08:22:01.809460 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0425 08:22:01.809513 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0425 08:22:01.809551 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0425 08:22:01.809610 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/self_attention/key/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0425 08:22:01.809662 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/self_attention/out/kernel
    Shape:     float32[16,16,128,2048]
    Logical:   P('heads', 'layers', 'kv', 'embed')
    Physical:  (None, None, None, 'fsdp')
I0425 08:22:01.809701 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/self_attention/query/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'q_heads', 'kv')
    Physical:  ('fsdp', None, None, None)
I0425 08:22:01.809735 135425501923136 maxtext_utils.py:1707]  params/params/decoder/layers/self_attention/value/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0425 08:22:01.809781 135425501923136 maxtext_utils.py:1707]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0425 08:22:01.809828 135425501923136 maxtext_utils.py:1707]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0425 08:22:02.293936 135425501923136 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 08:22:02.294030 135425501923136 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 08:22:02.309599 135425501923136 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 08:22:02.309660 135425501923136 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 08:22:13.278911 135425501923136 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0425 08:22:13.279759 135425501923136 metric_logger.py:301] number parameters: 1.104 billion
I0425 08:22:24.624788 135425501923136 checkpointing.py:772] Waiting for step 10 to finish before checkpoint...
I0425 08:22:24.777982 135425501923136 checkpointing.py:776] Waited 0.15317320823669434 seconds for step 10 to finish before starting checkpointing.
I0425 08:22:24.780636 135425501923136 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 08:22:24.782498 135425501923136 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 10
I0425 08:22:24.783962 135425501923136 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/10.
I0425 08:22:25.122514 135425501923136 signaling_client.py:364] Using JaxDistributedSignalingClient
I0425 08:22:25.123513 135425501923136 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 08:22:25.123584 135425501923136 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0425 08:22:25.403945 135425501923136 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.281509s
I0425 08:22:25.404134 135425501923136 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.402 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2855815887451172 s) (per-host)
I0425 08:22:25.404191 135425501923136 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.285650s (batch_requests_ready=0.002310s, total_serialization_initiated=0.283249s, others=0.000091s)
I0425 08:22:25.404290 135425501923136 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.289765s (all_items=0.000019s, per_item={'items': '0.00001907'}, temp_paths=0.289746)
I0425 08:22:25.405011 135425501923136 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.62 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/10.
I0425 08:22:25.405379 135300546270976 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 08:42:25.405341
I0425 08:22:25.408070 135425501923136 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 08:22:25.408323 135299497707264 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0425 08:22:25.408471 135425501923136 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777105344.780611, 'wait_for_prev_duration_secs': 9.179115295410156e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777105344.7825575, 'checkpointer_blocking_duration_secs': 0.622978687286377, 'get_old_steps_start_time': 1777105345.4055586, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1777105344.7784815, 'checkpoint_manager_blocking_duration_secs': 0.6299550533294678}
I0425 08:22:25.408576 135425501923136 checkpointing.py:408] Started an asynchronous checkpoint save for step 10
I0425 08:22:25.408627 135425501923136 max_utils.py:750] 
Memstats: After params initialized:
I0425 08:22:25.408674 135425501923136 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0))
I0425 08:22:25.408706 135425501923136 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0425 08:22:25.408732 135425501923136 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0425 08:22:25.408756 135425501923136 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0425 08:22:25.719407 135425501923136 metric_logger.py:196] completed step: 10, seconds: 11.345, TFLOP/s/device: 1.198, Tokens/s/device: 180.521, total_weights: 65536, loss: 6.833, lm_loss: 6.833, perplexity: 927.869
I0425 08:22:25.913782 135425501923136 metric_logger.py:196] completed step: 11, seconds: 1.093, TFLOP/s/device: 12.430, Tokens/s/device: 1873.550, total_weights: 65536, loss: 6.527, lm_loss: 6.527, perplexity: 683.659
I0425 08:22:26.061455 135425501923136 metric_logger.py:196] completed step: 12, seconds: 0.047, TFLOP/s/device: 288.486, Tokens/s/device: 43483.800, total_weights: 65536, loss: 6.265, lm_loss: 6.265, perplexity: 526.068
I0425 08:22:26.208889 135425501923136 metric_logger.py:196] completed step: 13, seconds: 0.153, TFLOP/s/device: 88.717, Tokens/s/device: 13372.336, total_weights: 65536, loss: 6.045, lm_loss: 6.045, perplexity: 422.001
I0425 08:22:26.213389 135425501923136 checkpointing.py:772] Waiting for step 15 to finish before checkpoint...
I0425 08:22:26.503343 135425501923136 checkpointing.py:776] Waited 0.2899188995361328 seconds for step 15 to finish before starting checkpointing.
I0425 08:22:26.506352 135425501923136 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 08:22:30.401465 135299506099968 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/10/items/array_metadatas/process_6
I0425 08:22:35.565484 135300546270976 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 151.202 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.44689679145813 s) (per-host)
I0425 08:22:35.565612 135300546270976 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.160120s.
I0425 08:22:41.450679 135300546270976 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 16.045170s.
I0425 08:22:41.450946 135299497707264 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 08:22:41.451060 135299497707264 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0425 08:22:41.451123 135299497707264 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0425 08:22:41.453016 135299497707264 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0425 08:22:41.453184 135425501923136 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0425 08:22:41.453315 135425501923136 checkpoint_manager.py:1452] Waiting for previous save to complete took 14.946961 seconds. If this number is high, consider checkpointing less frequently.
I0425 08:22:41.455424 135425501923136 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 15
I0425 08:22:41.457880 135425501923136 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/15.
I0425 08:22:41.738972 135425501923136 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 08:22:41.739065 135425501923136 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0425 08:22:41.780711 135425501923136 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042732s
I0425 08:22:41.780873 135425501923136 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 33.349 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04625558853149414 s) (per-host)
I0425 08:22:41.780923 135425501923136 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046314s (batch_requests_ready=0.001890s, total_serialization_initiated=0.044357s, others=0.000067s)
I0425 08:22:41.781010 135425501923136 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.051292s (all_items=0.000013s, per_item={'items': '0.00001311'}, temp_paths=0.051279)
I0425 08:22:41.781720 135425501923136 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.33 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/15.
I0425 08:22:41.782057 135299497707264 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 08:42:41.782018
I0425 08:22:41.784130 135425501923136 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 08:22:41.784446 135295748003584 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0425 08:22:41.784582 135425501923136 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777105346.506323, 'wait_for_prev_duration_secs': 14.946961402893066, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777105361.4554675, 'checkpointer_blocking_duration_secs': 0.3267514705657959, 'get_old_steps_start_time': 1777105361.782245, 'get_old_steps_duration_secs': 3.0040740966796875e-05, 'checkpoint_manager_blocking_start_time': 1777105346.5039601, 'checkpoint_manager_blocking_duration_secs': 15.280587434768677}
I0425 08:22:41.784746 135425501923136 checkpointing.py:408] Started an asynchronous checkpoint save for step 15
I0425 08:22:41.785534 135425501923136 metric_logger.py:196] completed step: 14, seconds: 0.148, TFLOP/s/device: 92.076, Tokens/s/device: 13878.724, total_weights: 65536, loss: 5.864, lm_loss: 5.864, perplexity: 352.193
I0425 08:22:41.791905 135425501923136 metric_logger.py:196] completed step: 15, seconds: 0.148, TFLOP/s/device: 92.069, Tokens/s/device: 13877.689, total_weights: 65536, loss: 5.719, lm_loss: 5.719, perplexity: 304.661
I0425 08:22:46.796527 135299506099968 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/15/items/array_metadatas/process_6
I0425 08:22:51.678791 135299497707264 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 158.847 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 9.944111824035645 s) (per-host)
I0425 08:22:51.678917 135299497707264 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 9.896730s.
I0425 08:22:57.061857 135299497707264 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 15.279653s.
I0425 08:22:57.062164 135295748003584 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 08:22:57.062309 135295748003584 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0425 08:22:57.062361 135295748003584 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0425 08:22:57.063895 135295748003584 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0425 08:23:02.477665 135425501923136 metric_logger.py:196] completed step: 16, seconds: 15.577, TFLOP/s/device: 0.872, Tokens/s/device: 131.476, total_weights: 65536, loss: 5.605, lm_loss: 5.605, perplexity: 271.872
I0425 08:23:02.624975 135425501923136 metric_logger.py:196] completed step: 17, seconds: 20.540, TFLOP/s/device: 0.662, Tokens/s/device: 99.710, total_weights: 65536, loss: 5.517, lm_loss: 5.517, perplexity: 248.975
I0425 08:23:02.772286 135425501923136 metric_logger.py:196] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.190, Tokens/s/device: 13443.613, total_weights: 65536, loss: 5.448, lm_loss: 5.448, perplexity: 232.333
I0425 08:23:02.919049 135425501923136 checkpointing.py:772] Waiting for step 19 to finish before checkpoint...
I0425 08:23:02.919783 135425501923136 checkpointing.py:776] Waited 0.0007543563842773438 seconds for step 19 to finish before starting checkpointing.
I0425 08:23:02.921813 135425501923136 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 08:23:02.923544 135425501923136 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 19
I0425 08:23:02.924838 135425501923136 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/19.
I0425 08:23:03.247838 135425501923136 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 08:23:03.247933 135425501923136 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0425 08:23:03.289537 135425501923136 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042638s
I0425 08:23:03.289695 135425501923136 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 33.389 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04620003700256348 s) (per-host)
I0425 08:23:03.289745 135425501923136 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046259s (batch_requests_ready=0.001767s, total_serialization_initiated=0.044429s, others=0.000063s)
I0425 08:23:03.289834 135425501923136 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050433s (all_items=0.000012s, per_item={'items': '0.00001168'}, temp_paths=0.050421)
I0425 08:23:03.290517 135425501923136 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.37 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/19.
I0425 08:23:03.290842 135295748003584 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 08:43:03.290804
I0425 08:23:03.292738 135425501923136 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 08:23:03.292951 135295194347264 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0425 08:23:03.293072 135425501923136 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777105382.921781, 'wait_for_prev_duration_secs': 7.200241088867188e-05, 'time_between_consecutive_saves_sec': 5.85784649848938, 'checkpointer_blocking_start_time': 1777105382.9235842, 'checkpointer_blocking_duration_secs': 0.36739611625671387, 'get_old_steps_start_time': 1777105383.2909966, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1777105382.9200153, 'checkpoint_manager_blocking_duration_secs': 0.37302708625793457}
I0425 08:23:03.293204 135425501923136 checkpointing.py:408] Started an asynchronous checkpoint save for step 19
I0425 08:23:03.293252 135425501923136 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 08:23:08.379390 135299506099968 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_15_ocdbt_false/checkpoints/19/items/array_metadatas/process_6
I0425 08:23:13.118463 135295748003584 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 159.960 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 9.874923467636108 s) (per-host)
I0425 08:23:13.118605 135295748003584 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 9.827653s.
I0425 08:23:18.204630 135295748003584 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 14.913662s.
I0425 08:23:18.204918 135295194347264 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 08:23:18.205042 135295194347264 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0425 08:23:18.205085 135295194347264 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0425 08:23:18.208024 135295194347264 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0425 08:23:18.208233 135425501923136 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0425 08:23:18.208385 135425501923136 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 08:23:18.209401 135425501923136 metric_logger.py:196] completed step: 19, seconds: 0.147, TFLOP/s/device: 92.261, Tokens/s/device: 13906.525, total_weights: 65536, loss: 5.391, lm_loss: 5.391, perplexity: 219.349
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 25 08:23:31 UTC 2026
EXIT_CODE=0
test/pipeline-scan-nnx  ·  5b21b66fc  ·  test_pipeline_scan_nnx_20260425_201227  ·  full log 
XPK Start: Sat Apr 25 21:18:30 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
`rope_parameters`'s factor field must be a float >= 1, got 40
`rope_parameters`'s beta_fast field must be a float, got 32
`rope_parameters`'s beta_slow field must be a float, got 1
DeepseekV32Config got `key=rope_scaling` in kwargs but hasn't set it as attribute. For RoPE standardization you need to set `self.rope_parameters` in model's config. 
2026-04-25 21:18:55.561226: 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)
I0425 21:18:55.772563 137835727042368 max_utils.py:273] Attempting to initialize the jax distributed system...
I0425 21:19:04.813709 137835727042368 distributed.py:149] Starting JAX distributed service on [::]:8482
I0425 21:19:04.816072 137835727042368 distributed.py:172] Connecting to JAX distributed service on mt-15-ocdbt-false-rs-x931h-slice-job-0-0.mt-15-ocdbt-false-rs-x931h:8482
I0425 21:19:05.904501 137835727042368 max_utils.py:284] Jax distributed system initialized!
I0425 21:19:11.006742 137835727042368 max_utils.py:800] System Information: Jax Version: 0.9.2
I0425 21:19:11.006848 137835727042368 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0425 21:19:11.006888 137835727042368 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365
I0425 21:19:11.006923 137835727042368 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0425 21:19:11.694690 137835727042368 maxtext_utils.py:1565] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0425 21:19:11.694969 137835727042368 checkpointing.py:677] Setting up checkpoint logger...
I0425 21:19:11.695026 137835727042368 checkpointing.py:233] Creating checkpoint manager with ocdbt=False and zarr3=True
I0425 21:19:11.695070 137835727042368 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0425 21:19:11.695436 137835727042368 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=False, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7d5bcd118c20>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0425 21:19:13.012843 137835727042368 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0425 21:19:13.013088 137835727042368 checkpoint_manager.py:708] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d47383f8800>}, handler_registry=None
I0425 21:19:13.013349 137835727042368 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d47383f8800>` 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`.
I0425 21:19:13.013399 137835727042368 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d47383d7d40>` 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`.
I0425 21:19:13.013436 137835727042368 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 0x7d47383f8800>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d47383f8800>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d47383d7d40>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d47383d7d40>}).
I0425 21:19:13.013764 137835727042368 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0425 21:19:13.013833 137835727042368 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d47381e3420> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0425 21:19:14.951864 137716574447360 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1777151778896221725, 'commit_timestamp_nsecs': 1777151793675360625, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/0/_CHECKPOINT_METADATA
I0425 21:19:15.197184 137716574447360 checkpoint_manager.py:1871] Missing metrics for step 0
I0425 21:19:16.027329 137835727042368 checkpoint_manager.py:1812] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints
I0425 21:19:16.296731 137835727042368 checkpoint_manager.py:929] [process=6][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=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, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d47383d9730>
I0425 21:19:16.296910 137835727042368 checkpointing.py:301] Checkpoint manager created!
I0425 21:19:17.227286 137835727042368 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0425 21:19:17.227403 137835727042368 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 21:19:17.606770 137835727042368 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 21:19:17.606865 137835727042368 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 21:19:17.623309 137835727042368 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 21:19:17.623369 137835727042368 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 21:19:17.646864 137835727042368 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 21:19:17.646932 137835727042368 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 21:19:17.663373 137835727042368 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 21:19:17.663432 137835727042368 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 21:19:17.679753 137835727042368 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 21:19:17.679813 137835727042368 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 21:19:17.704717 137835727042368 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0425 21:19:17.704789 137835727042368 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 21:19:17.726675 137835727042368 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0425 21:19:17.726747 137835727042368 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0425 21:19:17.935700 137835727042368 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0425 21:19:17.935826 137835727042368 checkpointing.py:581] restoring from this run's directory step 9
I0425 21:19:18.182329 137835727042368 event_tracking.py:70] [process=6] [sync] Started load checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/9.
I0425 21:19:18.431849 137835727042368 checkpointer.py:307] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/9.
I0425 21:19:18.432296 137835727042368 event_tracking.py:125] [process=6] [sync] Finished blocking load in 0.25 seconds. Continuing load @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/9.
I0425 21:19:21.101682    1449 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0425 21:19:29.709351 137835727042368 jax_array_handlers.py:843] [process=6] /jax/orbax/read/worker/io/requested throughput: 162.444 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 9.728121995925903 s) (per-host)
I0425 21:19:29.716772 137835727042368 base_pytree_checkpoint_handler.py:130] [process=6] /jax/checkpoint/read/gbytes_per_sec: 156.008 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.14431643486023 s) (per-host)
I0425 21:19:30.977285 137835727042368 event_tracking.py:138] [process=6] [sync] Finished load in 12.80 seconds @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/9
I0425 21:19:30.977442 137835727042368 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints', 'checkpointer_start_time': 1777151958.1822255, 'checkpointer_duration_secs': 12.795186042785645, 'checkpoint_manager_start_time': 1777151957.9361062, 'checkpoint_manager_duration_secs': 13.0413076877594}
fsdp: 32
I0425 21:19:31.395158 137835727042368 maxtext_utils.py:1668]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0425 21:19:31.395291 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 21:19:31.395347 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 21:19:31.395407 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0425 21:19:31.395462 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0425 21:19:31.395501 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0425 21:19:31.395558 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/self_attention/key/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0425 21:19:31.395613 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/self_attention/out/kernel
    Shape:     float32[16,16,128,2048]
    Logical:   P('heads', 'layers', 'kv', 'embed')
    Physical:  (None, None, None, 'fsdp')
I0425 21:19:31.395653 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/self_attention/query/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'q_heads', 'kv')
    Physical:  ('fsdp', None, None, None)
I0425 21:19:31.395691 137835727042368 maxtext_utils.py:1668]  params/params/decoder/layers/self_attention/value/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0425 21:19:31.395739 137835727042368 maxtext_utils.py:1668]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0425 21:19:31.395789 137835727042368 maxtext_utils.py:1668]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0425 21:19:31.885031 137835727042368 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 21:19:31.885139 137835727042368 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 21:19:31.901138 137835727042368 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 21:19:31.901195 137835727042368 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 21:19:42.987939 137835727042368 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0425 21:19:42.988812 137835727042368 metric_logger.py:301] number parameters: 1.104 billion
I0425 21:19:54.705059 137835727042368 checkpointing.py:772] Waiting for step 10 to finish before checkpoint...
I0425 21:19:54.858164 137835727042368 checkpointing.py:776] Waited 0.15308141708374023 seconds for step 10 to finish before starting checkpointing.
I0425 21:19:54.860506 137835727042368 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 21:19:54.862527 137835727042368 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 10
I0425 21:19:54.864163 137835727042368 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/10.
I0425 21:19:55.613058 137835727042368 signaling_client.py:364] Using JaxDistributedSignalingClient
I0425 21:19:55.614014 137835727042368 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 21:19:55.614070 137835727042368 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0425 21:19:55.888633 137835727042368 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.275650s
I0425 21:19:55.888808 137835727042368 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.519 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2794816493988037 s) (per-host)
I0425 21:19:55.888862 137835727042368 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.279547s (batch_requests_ready=0.002133s, total_serialization_initiated=0.277340s, others=0.000074s)
I0425 21:19:55.888955 137835727042368 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.283825s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.283807)
I0425 21:19:55.889709 137835727042368 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.03 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/10.
I0425 21:19:55.890042 137713789413120 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 21:39:55.890003
I0425 21:19:55.900505 137835727042368 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 21:19:55.900750 137711662503680 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0425 21:19:55.900874 137835727042368 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777151994.8604808, 'wait_for_prev_duration_secs': 6.842613220214844e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777151994.8625662, 'checkpointer_blocking_duration_secs': 1.0276405811309814, 'get_old_steps_start_time': 1777151995.8902302, 'get_old_steps_duration_secs': 3.361701965332031e-05, 'checkpoint_manager_blocking_start_time': 1777151994.8587327, 'checkpoint_manager_blocking_duration_secs': 1.0421066284179688}
I0425 21:19:55.900979 137835727042368 checkpointing.py:408] Started an asynchronous checkpoint save for step 10
I0425 21:19:55.901027 137835727042368 max_utils.py:750] 
Memstats: After params initialized:
I0425 21:19:55.901075 137835727042368 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0))
I0425 21:19:55.901133 137835727042368 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0425 21:19:55.901165 137835727042368 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0425 21:19:55.901190 137835727042368 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0425 21:19:56.213653 137835727042368 metric_logger.py:196] completed step: 10, seconds: 11.716, TFLOP/s/device: 1.160, Tokens/s/device: 174.802, total_weights: 65536, loss: 6.833, lm_loss: 6.833, perplexity: 927.869
I0425 21:19:56.812812 137835727042368 metric_logger.py:196] completed step: 11, seconds: 1.507, TFLOP/s/device: 9.016, Tokens/s/device: 1359.044, total_weights: 65536, loss: 6.527, lm_loss: 6.527, perplexity: 683.659
I0425 21:19:56.960121 137835727042368 metric_logger.py:196] completed step: 12, seconds: 0.453, TFLOP/s/device: 29.987, Tokens/s/device: 4520.013, total_weights: 65536, loss: 6.265, lm_loss: 6.265, perplexity: 526.068
I0425 21:19:57.107378 137835727042368 metric_logger.py:196] completed step: 13, seconds: 0.152, TFLOP/s/device: 89.170, Tokens/s/device: 13440.701, total_weights: 65536, loss: 6.045, lm_loss: 6.045, perplexity: 422.001
I0425 21:19:57.112033 137835727042368 checkpointing.py:772] Waiting for step 15 to finish before checkpoint...
I0425 21:19:57.401563 137835727042368 checkpointing.py:776] Waited 0.28949403762817383 seconds for step 15 to finish before starting checkpointing.
I0425 21:19:57.404582 137835727042368 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 21:20:02.467397 137712212371200 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/10/items/array_metadatas/process_6
I0425 21:20:07.150226 137713789413120 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 136.870 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.540863275527954 s) (per-host)
I0425 21:20:07.150355 137713789413120 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 11.260189s.
I0425 21:20:15.012455 137713789413120 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 19.122272s.
I0425 21:20:15.012762 137711662503680 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 21:20:15.012898 137711662503680 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0425 21:20:15.012960 137711662503680 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0425 21:20:15.015353 137711662503680 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0425 21:20:15.015544 137835727042368 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0425 21:20:15.015676 137835727042368 checkpoint_manager.py:1452] Waiting for previous save to complete took 17.611094 seconds. If this number is high, consider checkpointing less frequently.
I0425 21:20:15.017920 137835727042368 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 15
I0425 21:20:15.020401 137835727042368 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/15.
I0425 21:20:15.600946 137835727042368 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 21:20:15.601061 137835727042368 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0425 21:20:15.625815 137835727042368 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.026853s
I0425 21:20:15.625945 137835727042368 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 50.931 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.030287504196166992 s) (per-host)
I0425 21:20:15.626010 137835727042368 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.030358s (batch_requests_ready=0.001779s, total_serialization_initiated=0.028502s, others=0.000077s)
I0425 21:20:15.626131 137835727042368 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.035522s (all_items=0.000014s, per_item={'items': '0.00001383'}, temp_paths=0.035509)
I0425 21:20:15.626844 137835727042368 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.61 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/15.
I0425 21:20:15.627158 137711662503680 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 21:40:15.627124
I0425 21:20:15.640784 137835727042368 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 21:20:15.641042 137708462667520 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0425 21:20:15.641168 137835727042368 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777151997.4045517, 'wait_for_prev_duration_secs': 17.6110942363739, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777152015.0179622, 'checkpointer_blocking_duration_secs': 0.6093554496765137, 'get_old_steps_start_time': 1777152015.6273434, 'get_old_steps_duration_secs': 3.0994415283203125e-05, 'checkpoint_manager_blocking_start_time': 1777151997.40218, 'checkpoint_manager_blocking_duration_secs': 18.238954544067383}
I0425 21:20:15.641335 137835727042368 checkpointing.py:408] Started an asynchronous checkpoint save for step 15
I0425 21:20:15.642138 137835727042368 metric_logger.py:196] completed step: 14, seconds: 0.147, TFLOP/s/device: 92.414, Tokens/s/device: 13929.699, total_weights: 65536, loss: 5.864, lm_loss: 5.864, perplexity: 352.193
I0425 21:20:15.648408 137835727042368 metric_logger.py:196] completed step: 15, seconds: 0.147, TFLOP/s/device: 92.160, Tokens/s/device: 13891.338, total_weights: 65536, loss: 5.719, lm_loss: 5.719, perplexity: 304.661
I0425 21:20:21.484614 137712212371200 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/15/items/array_metadatas/process_6
I0425 21:20:26.467022 137711662503680 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 145.299 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.871325969696045 s) (per-host)
I0425 21:20:26.467165 137711662503680 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.839889s.
I0425 21:20:32.181052 137711662503680 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 16.553760s.
I0425 21:20:32.181307 137708462667520 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 21:20:32.181366 137708462667520 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0425 21:20:32.181412 137708462667520 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0425 21:20:32.184012 137708462667520 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0425 21:20:37.007050 137835727042368 metric_logger.py:196] completed step: 16, seconds: 18.535, TFLOP/s/device: 0.733, Tokens/s/device: 110.495, total_weights: 65536, loss: 5.605, lm_loss: 5.605, perplexity: 271.872
I0425 21:20:37.154471 137835727042368 metric_logger.py:196] completed step: 17, seconds: 21.213, TFLOP/s/device: 0.641, Tokens/s/device: 96.546, total_weights: 65536, loss: 5.517, lm_loss: 5.517, perplexity: 248.975
I0425 21:20:37.302276 137835727042368 metric_logger.py:196] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.197, Tokens/s/device: 13444.760, total_weights: 65536, loss: 5.448, lm_loss: 5.448, perplexity: 232.333
I0425 21:20:37.448762 137835727042368 checkpointing.py:772] Waiting for step 19 to finish before checkpoint...
I0425 21:20:37.449487 137835727042368 checkpointing.py:776] Waited 0.0007455348968505859 seconds for step 19 to finish before starting checkpointing.
I0425 21:20:37.451655 137835727042368 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 21:20:37.453215 137835727042368 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 19
I0425 21:20:37.454620 137835727042368 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/19.
I0425 21:20:37.741785 137835727042368 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 21:20:37.741878 137835727042368 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0425 21:20:37.766125 137835727042368 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.025436s
I0425 21:20:37.766262 137835727042368 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 53.432 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.02886962890625 s) (per-host)
I0425 21:20:37.766310 137835727042368 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.028927s (batch_requests_ready=0.001756s, total_serialization_initiated=0.027110s, others=0.000061s)
I0425 21:20:37.766389 137835727042368 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.033038s (all_items=0.000012s, per_item={'items': '0.00001216'}, temp_paths=0.033026)
I0425 21:20:37.767116 137835727042368 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.31 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/19.
I0425 21:20:37.767465 137708462667520 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 21:40:37.767424
I0425 21:20:37.773140 137835727042368 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 21:20:37.773395 137707909011200 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0425 21:20:37.773526 137835727042368 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777152037.4516237, 'wait_for_prev_duration_secs': 7.271766662597656e-05, 'time_between_consecutive_saves_sec': 5.2675700187683105, 'checkpointer_blocking_start_time': 1777152037.4532537, 'checkpointer_blocking_duration_secs': 0.31437039375305176, 'get_old_steps_start_time': 1777152037.7676423, 'get_old_steps_duration_secs': 2.6464462280273438e-05, 'checkpoint_manager_blocking_start_time': 1777152037.449733, 'checkpoint_manager_blocking_duration_secs': 0.3237588405609131}
I0425 21:20:37.773636 137835727042368 checkpointing.py:408] Started an asynchronous checkpoint save for step 19
I0425 21:20:37.773688 137835727042368 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 21:20:42.889471 137712212371200 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260425_201227/linen_xpk_test_pipeline_scan_nnx_20260425_201227_15_ocdbt_false/checkpoints/19/items/array_metadatas/process_6
I0425 21:20:48.043273 137708462667520 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 153.272 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.305842399597168 s) (per-host)
I0425 21:20:48.043398 137708462667520 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.275806s.
I0425 21:20:53.340322 137708462667520 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 15.572700s.
I0425 21:20:53.340608 137707909011200 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 21:20:53.340726 137707909011200 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0425 21:20:53.340768 137707909011200 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0425 21:20:53.343632 137707909011200 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0425 21:20:53.343807 137835727042368 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0425 21:20:53.343956 137835727042368 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 21:20:53.345043 137835727042368 metric_logger.py:196] completed step: 19, seconds: 0.148, TFLOP/s/device: 91.878, Tokens/s/device: 13848.880, total_weights: 65536, loss: 5.391, lm_loss: 5.391, perplexity: 219.349
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 25 21:21:05 UTC 2026
EXIT_CODE=0