MaxView

Timing Test Reference Updates
‹ 08_checkpoint_async_true_resumeCase: 08_checkpoint_async_true_save09_pdb_lt_1 ›

Metrics: main (574ad3fb9) vs test/pipeline-scan-nnx (574ad3fb9)

Metricmain  574ad3fb9test/pipeline-scan-nnx  574ad3fb9Diff (test/pipeline-scan-nnx − main)
Parameters1.104 billion1.104 billion—
Final loss7.18107.18100
TFLOP/s92.11992.136+0.017
Tok/s13885.113887.8+2.637
Avg s/step7.9837.362-0.621
Memory %1.381.380
JAX0.9.20.8.1—

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

main  ·  574ad3fb9  ·  main_20260418_180002  ·  full log 
XPK Start: Sat Apr 18 18:27:57 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-18 18:28:21.237767: 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)
I0418 18:28:21.776747 132574670817088 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 18:28:30.818197 132574670817088 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 18:28:30.820647 132574670817088 distributed.py:172] Connecting to JAX distributed service on mt-08-checkpoint-async--z5lnl-slice-job-0-0.mt-08-checkpoint-async--z5lnl:8482
I0418 18:28:31.745230 132574670817088 max_utils.py:284] Jax distributed system initialized!
I0418 18:28:37.797868 132574670817088 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 18:28:37.797971 132574670817088 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 18:28:37.798011 132574670817088 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
I0418 18:28:37.798045 132574670817088 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 18:28:38.495049 132574670817088 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 18:28:38.495357 132574670817088 checkpointing.py:677] Setting up checkpoint logger...
I0418 18:28:38.495410 132574670817088 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0418 18:28:38.495454 132574670817088 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 18:28:38.495784 132574670817088 base_pytree_checkpoint_handler.py:441] 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 0x7892ba84c170>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 18:28:42.196826 132574670817088 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 18:28:42.197061 132574670817088 checkpoint_manager.py:708] [process=7][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x787e7848f140>}, handler_registry=None
I0418 18:28:42.197313 132574670817088 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x787e7848f140>` 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`.
I0418 18:28:42.197367 132574670817088 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x787e78492a50>` 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`.
I0418 18:28:42.197402 132574670817088 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 0x787e7848f140>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x787e7848f140>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x787e78492a50>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x787e78492a50>}).
I0418 18:28:42.197716 132574670817088 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 18:28:42.197786 132574670817088 async_checkpointer.py:192] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x787db07c7600> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 18:28:43.455608 132574670817088 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints
I0418 18:28:44.771598 132574670817088 checkpoint_manager.py:929] [process=7][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_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7891af0c8740>
I0418 18:28:44.771769 132574670817088 checkpointing.py:301] Checkpoint manager created!
I0418 18:28:45.688111 132574670817088 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 18:28:45.688223 132574670817088 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:28:46.066898 132574670817088 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 18:28:46.066985 132574670817088 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:28:46.083353 132574670817088 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 18:28:46.083413 132574670817088 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:28:46.107329 132574670817088 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:28:46.107397 132574670817088 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:28:46.123526 132574670817088 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:28:46.123585 132574670817088 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:28:46.139661 132574670817088 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:28:46.139720 132574670817088 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:28:46.164100 132574670817088 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 18:28:46.164166 132574670817088 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:28:46.185165 132574670817088 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 18:28:46.185226 132574670817088 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 18:28:46.401657 132574670817088 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 18:28:46.401766 132574670817088 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 18:28:47.818270 132574670817088 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0418 18:28:47.818393 132574670817088 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0418 18:28:47.818446 132574670817088 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0418 18:28:47.818503 132574670817088 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0418 18:28:47.818555 132574670817088 maxtext_utils.py:1654]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0418 18:28:47.818593 132574670817088 maxtext_utils.py:1654]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0418 18:28:47.818643 132574670817088 maxtext_utils.py:1654]  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)
I0418 18:28:47.818692 132574670817088 maxtext_utils.py:1654]  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')
I0418 18:28:47.818730 132574670817088 maxtext_utils.py:1654]  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)
I0418 18:28:47.818767 132574670817088 maxtext_utils.py:1654]  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)
I0418 18:28:47.818812 132574670817088 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0418 18:28:47.818866 132574670817088 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0418 18:28:48.304119 132574670817088 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 18:28:48.304211 132574670817088 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 18:28:48.319483 132574670817088 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 18:28:48.319546 132574670817088 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 18:28:59.260764 132574670817088 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.
I0418 18:28:59.261606 132574670817088 metric_logger.py:301] number parameters: 1.104 billion
I0418 18:29:10.649387 132574670817088 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 18:29:10.804337 132574670817088 checkpointing.py:776] Waited 0.15493249893188477 seconds for step 0 to finish before starting checkpointing.
I0418 18:29:10.806760 132574670817088 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:29:10.808538 132574670817088 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 0
I0418 18:29:10.809932 132574670817088 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/0.
I0418 18:29:12.007992 132574670817088 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 18:29:12.008984 132574670817088 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:29:12.009042 132574670817088 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
I0418 18:29:12.292635 132574670817088 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.284722s
I0418 18:29:12.292803 132574670817088 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 5.316 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2901487350463867 s) (per-host)
I0418 18:29:12.292853 132574670817088 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.290208s (batch_requests_ready=0.002192s, total_serialization_initiated=0.287949s, others=0.000066s)
I0418 18:29:12.292940 132574670817088 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.294337s (all_items=0.000019s, per_item={'items': '0.00001860'}, temp_paths=0.294318)
I0418 18:29:12.293761 132574670817088 event_tracking.py:125] [process=7] [async] Finished blocking save in 1.49 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/0.
I0418 18:29:12.294131 132446938552064 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:49:12.294091
I0418 18:29:12.298395 132574670817088 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:29:12.298689 132446439855872 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:29:12.298842 132574670817088 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776536950.8067417, 'wait_for_prev_duration_secs': 6.461143493652344e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776536950.808577, 'checkpointer_blocking_duration_secs': 1.4857075214385986, 'get_old_steps_start_time': 1776536952.2943108, 'get_old_steps_duration_secs': 3.0994415283203125e-05, 'checkpoint_manager_blocking_start_time': 1776536950.8048866, 'checkpoint_manager_blocking_duration_secs': 1.4939169883728027}
I0418 18:29:12.298953 132574670817088 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 18:29:12.299003 132574670817088 max_utils.py:750] 
Memstats: After params initialized:
I0418 18:29:12.299051 132574670817088 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0418 18:29:12.299095 132574670817088 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0418 18:29:12.299123 132574670817088 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0418 18:29:12.299148 132574670817088 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0418 18:29:12.609538 132574670817088 metric_logger.py:196] completed step: 0, seconds: 11.388, TFLOP/s/device: 1.193, Tokens/s/device: 179.844, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 18:29:12.784892 132574670817088 metric_logger.py:196] completed step: 1, seconds: 1.958, TFLOP/s/device: 6.938, Tokens/s/device: 1045.767, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 18:29:13.189715 132574670817088 metric_logger.py:196] completed step: 2, seconds: 0.028, TFLOP/s/device: 476.992, Tokens/s/device: 71897.490, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38547.719
I0418 18:29:13.337103 132574670817088 metric_logger.py:196] completed step: 3, seconds: 0.405, TFLOP/s/device: 33.569, Tokens/s/device: 5059.951, total_weights: 65536, loss: 9.980, lm_loss: 9.980, perplexity: 21590.506
I0418 18:29:13.341547 132574670817088 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0418 18:29:13.631338 132574670817088 checkpointing.py:776] Waited 0.28975391387939453 seconds for step 5 to finish before starting checkpointing.
I0418 18:29:13.634217 132574670817088 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 18:29:15.996151    2757 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 18:29:18.884357 132446448248576 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/0/items/array_metadatas/process_7
I0418 18:29:48.461236 132446938552064 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 43.326 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.45853900909424 s) (per-host)
I0418 18:29:48.461359 132446938552064 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.167114s.
I0418 18:29:57.706493 132446938552064 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 45.412232s.
I0418 18:29:57.706776 132446439855872 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:29:57.706893 132446439855872 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:29:57.706943 132446439855872 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:29:57.708966 132446439855872 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 18:29:57.709083 132574670817088 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0418 18:29:57.709154 132574670817088 checkpoint_manager.py:1452] Waiting for previous save to complete took 44.074941 seconds. If this number is high, consider checkpointing less frequently.
I0418 18:29:57.711159 132574670817088 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 5
I0418 18:29:57.713717 132574670817088 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/5.
I0418 18:29:58.874671 132574670817088 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:29:58.874763 132574670817088 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
I0418 18:29:58.924510 132574670817088 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.050913s
I0418 18:29:58.924671 132574670817088 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 28.420 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.05427718162536621 s) (per-host)
I0418 18:29:58.924719 132574670817088 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.054335s (batch_requests_ready=0.001739s, total_serialization_initiated=0.052531s, others=0.000065s)
I0418 18:29:58.924805 132574670817088 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.059390s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.059375)
I0418 18:29:58.925482 132574670817088 event_tracking.py:125] [process=7] [async] Finished blocking save in 1.21 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/5.
I0418 18:29:58.925825 132446448248576 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:49:58.925788
I0418 18:29:58.927812 132574670817088 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:29:58.928125 132446439855872 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:29:58.928285 132574670817088 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776536953.6341896, 'wait_for_prev_duration_secs': 44.07494115829468, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776536997.711196, 'checkpointer_blocking_duration_secs': 1.2147679328918457, 'get_old_steps_start_time': 1776536998.9259868, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776536953.631946, 'checkpoint_manager_blocking_duration_secs': 45.29630422592163}
I0418 18:29:58.928399 132574670817088 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0418 18:29:58.929236 132574670817088 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.822, Tokens/s/device: 13388.159, total_weights: 65536, loss: 9.460, lm_loss: 9.460, perplexity: 12840.355
I0418 18:29:58.935419 132574670817088 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.122, Tokens/s/device: 13885.687, total_weights: 65536, loss: 8.959, lm_loss: 8.959, perplexity: 7776.467
I0418 18:30:06.163572 132424084199168 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/5/items/array_metadatas/process_7
I0418 18:30:22.342277 132574670817088 metric_logger.py:196] completed step: 6, seconds: 45.592, TFLOP/s/device: 0.298, Tokens/s/device: 44.920, total_weights: 65536, loss: 8.469, lm_loss: 8.469, perplexity: 4762.740
I0418 18:30:22.489804 132574670817088 metric_logger.py:196] completed step: 7, seconds: 23.261, TFLOP/s/device: 0.584, Tokens/s/device: 88.045, total_weights: 65536, loss: 8.003, lm_loss: 8.003, perplexity: 2989.151
I0418 18:30:22.637305 132574670817088 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.354, Tokens/s/device: 13468.456, total_weights: 65536, loss: 7.572, lm_loss: 7.572, perplexity: 1943.098
I0418 18:30:22.784133 132574670817088 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0418 18:30:22.784820 132574670817088 checkpointing.py:776] Waited 0.0007138252258300781 seconds for step 9 to finish before starting checkpointing.
I0418 18:30:22.787127 132574670817088 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 18:30:40.960010 132446448248576 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 37.529 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.08957839012146 s) (per-host)
I0418 18:30:40.960157 132446448248576 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.034222s.
I0418 18:30:51.208843 132446448248576 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 52.282891s.
I0418 18:30:51.209142 132446439855872 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:30:51.209261 132446439855872 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:30:51.209311 132446439855872 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:30:51.210919 132446439855872 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0418 18:30:51.211128 132574670817088 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5.
W0418 18:30:51.211251 132574670817088 checkpoint_manager.py:1452] Waiting for previous save to complete took 28.424131 seconds. If this number is high, consider checkpointing less frequently.
I0418 18:30:51.212728 132574670817088 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 9
I0418 18:30:51.214944 132574670817088 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/9.
I0418 18:30:52.372566 132574670817088 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:30:52.372654 132574670817088 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
I0418 18:30:52.421012 132574670817088 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.049388s
I0418 18:30:52.421192 132574670817088 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 29.235 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.0527651309967041 s) (per-host)
I0418 18:30:52.421243 132574670817088 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.052827s (batch_requests_ready=0.001602s, total_serialization_initiated=0.051158s, others=0.000067s)
I0418 18:30:52.421334 132574670817088 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.056937s (all_items=0.000011s, per_item={'items': '0.00001073'}, temp_paths=0.056926)
I0418 18:30:52.422032 132574670817088 event_tracking.py:125] [process=7] [async] Finished blocking save in 1.21 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/9.
I0418 18:30:52.422379 132446439855872 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:50:52.422342
I0418 18:30:52.424278 132574670817088 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:30:52.424505 132443755501312 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:30:52.424628 132574670817088 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776537022.7870958, 'wait_for_prev_duration_secs': 28.424131393432617, 'time_between_consecutive_saves_sec': 25.078092098236084, 'checkpointer_blocking_start_time': 1776537051.212766, 'checkpointer_blocking_duration_secs': 1.2097578048706055, 'get_old_steps_start_time': 1776537052.4225416, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776537022.7850442, 'checkpoint_manager_blocking_duration_secs': 29.639551401138306}
I0418 18:30:52.424737 132574670817088 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0418 18:30:52.424778 132574670817088 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 18:31:00.194608 132446406285056 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_08_checkpoint_async_true/checkpoints/9/items/array_metadatas/process_7
I0418 18:31:34.873636 132446439855872 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 37.162 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.50517749786377 s) (per-host)
I0418 18:31:34.873746 132446439855872 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.451258s.
I0418 18:31:44.769047 132446439855872 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 52.346543s.
I0418 18:31:44.769276 132443755501312 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:31:44.769338 132443755501312 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:31:44.769379 132443755501312 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:31:44.771227 132443755501312 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0418 18:31:44.771396 132574670817088 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0418 18:31:44.771546 132574670817088 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:31:44.772477 132574670817088 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.119, Tokens/s/device: 13885.122, total_weights: 65536, loss: 7.181, lm_loss: 7.181, perplexity: 1314.495
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 18 18:31:58 UTC 2026
EXIT_CODE=0
test/pipeline-scan-nnx  ·  574ad3fb9  ·  test_pipeline_scan_nnx_20260419_085454  ·  full log 
XPK Start: Sun Apr 19 09:17:51 UTC 2026
2026-04-19 09:17:55.580492: 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 00:00:1776590275.593174      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776590275.596883      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776590275.608109      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776590275.608129      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776590275.608131      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776590275.608133      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-19 09:18:14.864417: 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)
I0419 09:18:15.381211 138774187362112 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-19 09:18:24,422:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0419 09:18:24.422784 138774187362112 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-19 09:18:24,425:jax._src.distributed:157: Connecting to JAX distributed service on mt-08-checkpoint-async--5pdqr-slice-job-0-0.mt-08-checkpoint-async--5pdqr:8482
I0419 09:18:24.425141 138774187362112 distributed.py:157] Connecting to JAX distributed service on mt-08-checkpoint-async--5pdqr-slice-job-0-0.mt-08-checkpoint-async--5pdqr:8482
I0419 09:18:26.391144 138774187362112 max_utils.py:284] Jax distributed system initialized!
I0419 09:18:33.301984 138774187362112 max_utils.py:800] System Information: Jax Version: 0.8.1
I0419 09:18:33.302090 138774187362112 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0419 09:18:33.302130 138774187362112 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
I0419 09:18:33.302166 138774187362112 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0419 09:18:33.925184 138774187362112 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0419 09:18:33.925485 138774187362112 checkpointing.py:677] Setting up checkpoint logger...
I0419 09:18:33.925556 138774187362112 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0419 09:18:33.925601 138774187362112 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0419 09:18:33.925954 138774187362112 base_pytree_checkpoint_handler.py:415] 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 0x7e3658d74f50>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0419 09:18:37.282261 138774187362112 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0419 09:18:37.282695 138774187362112 checkpoint_manager.py:709] [process=7][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e22e7ae0140>}, handler_registry=None
I0419 09:18:37.282935 138774187362112 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e22e7ae0140>` 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`.
I0419 09:18:37.282985 138774187362112 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e22e7ae3b60>` 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`.
I0419 09:18:37.283024 138774187362112 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 0x7e22e7ae0140>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e22e7ae0140>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e22e7ae3b60>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e22e7ae3b60>}).
I0419 09:18:37.285730 138774187362112 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0419 09:18:37.285815 138774187362112 async_checkpointer.py:177] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e36419fb2e0> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0419 09:18:38.379028 138774187362112 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints
I0419 09:18:39.280219 138774187362112 checkpoint_manager.py:929] [process=7][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_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e23b0a27470>
I0419 09:18:39.280396 138774187362112 checkpointing.py:301] Checkpoint manager created!
I0419 09:18:40.166607 138774187362112 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0419 09:18:40.166716 138774187362112 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 09:18:40.538551 138774187362112 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 09:18:40.538651 138774187362112 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 09:18:40.554294 138774187362112 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 09:18:40.554354 138774187362112 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 09:18:40.577518 138774187362112 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 09:18:40.577603 138774187362112 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 09:18:40.593388 138774187362112 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 09:18:40.593450 138774187362112 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 09:18:40.609139 138774187362112 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 09:18:40.609199 138774187362112 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 09:18:40.632775 138774187362112 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0419 09:18:40.632846 138774187362112 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 09:18:40.652203 138774187362112 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0419 09:18:40.652269 138774187362112 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0419 09:18:40.840752 138774187362112 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0419 09:18:40.840863 138774187362112 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0419 09:18:42.263072 138774187362112 maxtext_utils.py:1501]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0419 09:18:42.263211 138774187362112 maxtext_utils.py:1501]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0419 09:18:42.263267 138774187362112 maxtext_utils.py:1501]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0419 09:18:42.263327 138774187362112 maxtext_utils.py:1501]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   PartitionSpec('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0419 09:18:42.263379 138774187362112 maxtext_utils.py:1501]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0419 09:18:42.263425 138774187362112 maxtext_utils.py:1501]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0419 09:18:42.263480 138774187362112 maxtext_utils.py:1501]  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)
I0419 09:18:42.263546 138774187362112 maxtext_utils.py:1501]  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')
I0419 09:18:42.263590 138774187362112 maxtext_utils.py:1501]  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)
I0419 09:18:42.263628 138774187362112 maxtext_utils.py:1501]  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)
I0419 09:18:42.263676 138774187362112 maxtext_utils.py:1501]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0419 09:18:42.263723 138774187362112 maxtext_utils.py:1501]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')

I0419 09:18:42.760652 138774187362112 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 09:18:42.760757 138774187362112 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 09:18:42.775651 138774187362112 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 09:18:42.775715 138774187362112 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 09:18:53.406148 138774187362112 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.
I0419 09:18:53.407013 138774187362112 metric_logger.py:289] number parameters: 1.104 billion
I0419 09:19:04.432380 138774187362112 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0419 09:19:04.625806 138774187362112 checkpointing.py:776] Waited 0.19340920448303223 seconds for step 0 to finish before starting checkpointing.
I0419 09:19:04.628199 138774187362112 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 09:19:04.629876 138774187362112 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 0
I0419 09:19:04.632600 138774187362112 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/0.
I0419 09:19:05.351242 138774187362112 signaling_client.py:364] Using JaxDistributedSignalingClient
I0419 09:19:05.352306 138774187362112 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0419 09:19:05.352364 138774187362112 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
I0419 09:19:05.601070 138774187362112 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.249908s
I0419 09:19:05.601238 138774187362112 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.043 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.506939172744751 s) (per-host)
I0419 09:19:05.601287 138774187362112 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.506998s (batch_requests_ready=0.253549s, total_serialization_initiated=0.253381s, others=0.000067s)
I0419 09:19:05.601374 138774187362112 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.511173s (all_items=0.000019s, per_item={'items': '0.00001884'}, temp_paths=0.511154)
I0419 09:19:05.602393 138647827367680 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0419 09:19:05.602583 138774187362112 async_checkpointer.py:561] Finished blocking save. Time taken: 0.972632s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/0.
I0419 09:19:05.654357 138774187362112 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 09:19:05.654715 138645705062144 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0419 09:19:05.654866 138774187362112 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776590344.6281803, 'wait_for_prev_duration_secs': 6.365776062011719e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776590344.6299162, 'checkpointer_blocking_duration_secs': 0.9727756977081299, 'get_old_steps_start_time': 1776590345.6027172, 'get_old_steps_duration_secs': 2.6226043701171875e-05, 'checkpoint_manager_blocking_start_time': 1776590344.6263824, 'checkpoint_manager_blocking_duration_secs': 1.028442621231079}
I0419 09:19:05.654974 138774187362112 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0419 09:19:05.655028 138774187362112 max_utils.py:750] 
Memstats: After params initialized:
I0419 09:19:05.655081 138774187362112 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0419 09:19:05.655116 138774187362112 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0419 09:19:05.655145 138774187362112 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0419 09:19:05.655172 138774187362112 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0419 09:19:05.921227 138774187362112 metric_logger.py:185] completed step: 0, seconds: 11.025, TFLOP/s/device: 1.232, Tokens/s/device: 185.756, total_weights: 65536, loss: 10.874
I0419 09:19:06.086421 138774187362112 metric_logger.py:185] completed step: 1, seconds: 1.488, TFLOP/s/device: 9.134, Tokens/s/device: 1376.742, total_weights: 65536, loss: 10.874
I0419 09:19:06.489344 138774187362112 metric_logger.py:185] completed step: 2, seconds: 0.018, TFLOP/s/device: 757.618, Tokens/s/device: 114196.498, total_weights: 65536, loss: 10.560
I0419 09:19:06.636853 138774187362112 metric_logger.py:185] completed step: 3, seconds: 0.403, TFLOP/s/device: 33.687, Tokens/s/device: 5077.652, total_weights: 65536, loss: 9.980
I0419 09:19:06.641601 138774187362112 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0419 09:19:06.931609 138774187362112 checkpointing.py:776] Waited 0.28993749618530273 seconds for step 5 to finish before starting checkpointing.
I0419 09:19:06.934385 138774187362112 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 09:19:08.655205    2606 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0419 09:19:11.424631 138647835760384 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/0/items/array_metadatas/process_7
I0419 09:19:41.856361 138647827367680 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 42.968 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.762017011642456 s) (per-host)
I0419 09:19:41.856466 138647827367680 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.253959s.
I0419 09:19:50.162202 138647827367680 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 44.559680s.
I0419 09:19:50.162499 138645705062144 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 09:19:50.162636 138645705062144 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0419 09:19:50.162687 138645705062144 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0419 09:19:50.164484 138645705062144 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0419 09:19:50.164674 138774187362112 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0419 09:19:50.164822 138774187362112 checkpoint_manager.py:1458] Waiting for previous save to complete took 43.230440 seconds. If this number is high, consider checkpointing less frequently.
I0419 09:19:50.166935 138774187362112 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 5
I0419 09:19:50.170993 138774187362112 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/5.
I0419 09:19:51.139210 138774187362112 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0419 09:19:51.139314 138774187362112 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
I0419 09:19:51.183823 138774187362112 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046571s
I0419 09:19:51.183995 138774187362112 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.095 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.30274200439453125 s) (per-host)
I0419 09:19:51.184049 138774187362112 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.302806s (batch_requests_ready=0.254353s, total_serialization_initiated=0.048382s, others=0.000071s)
I0419 09:19:51.184144 138774187362112 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.307840s (all_items=0.000017s, per_item={'items': '0.00001740'}, temp_paths=0.307822)
I0419 09:19:51.185102 138646729324288 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0419 09:19:51.185266 138774187362112 async_checkpointer.py:561] Finished blocking save. Time taken: 1.018256s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/5.
I0419 09:19:51.191448 138774187362112 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 09:19:51.191739 138645705062144 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0419 09:19:51.191901 138774187362112 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776590346.934357, 'wait_for_prev_duration_secs': 43.23043966293335, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776590390.166976, 'checkpointer_blocking_duration_secs': 1.0183982849121094, 'get_old_steps_start_time': 1776590391.1853926, 'get_old_steps_duration_secs': 2.7179718017578125e-05, 'checkpoint_manager_blocking_start_time': 1776590346.9322252, 'checkpoint_manager_blocking_duration_secs': 44.25964283943176}
I0419 09:19:51.192006 138774187362112 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0419 09:19:51.192580 138774187362112 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.838, Tokens/s/device: 13390.697, total_weights: 65536, loss: 9.460
I0419 09:19:51.198751 138774187362112 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.227, Tokens/s/device: 13901.522, total_weights: 65536, loss: 8.959
I0419 09:20:10.539910 138774187362112 metric_logger.py:185] completed step: 6, seconds: 44.556, TFLOP/s/device: 0.305, Tokens/s/device: 45.965, total_weights: 65536, loss: 8.469
I0419 09:20:10.687325 138774187362112 metric_logger.py:185] completed step: 7, seconds: 19.195, TFLOP/s/device: 0.708, Tokens/s/device: 106.695, total_weights: 65536, loss: 8.003
I0419 09:20:10.834826 138774187362112 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.228, Tokens/s/device: 13449.352, total_weights: 65536, loss: 7.572
I0419 09:20:10.981855 138774187362112 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0419 09:20:10.982508 138774187362112 checkpointing.py:776] Waited 0.0006730556488037109 seconds for step 9 to finish before starting checkpointing.
I0419 09:20:10.984487 138774187362112 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 09:20:15.846295 138647835760384 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/5/items/array_metadatas/process_7
I0419 09:20:51.597167 138646729324288 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 26.016 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 60.71587371826172 s) (per-host)
I0419 09:20:51.597285 138646729324288 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 60.412072s.
I0419 09:20:59.919985 138646729324288 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 68.734751s.
I0419 09:20:59.920287 138645705062144 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 09:20:59.920424 138645705062144 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0419 09:20:59.920500 138645705062144 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0419 09:20:59.922063 138645705062144 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0419 09:20:59.922274 138774187362112 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5.
W0419 09:20:59.922413 138774187362112 checkpoint_manager.py:1458] Waiting for previous save to complete took 48.937943 seconds. If this number is high, consider checkpointing less frequently.
I0419 09:20:59.924171 138774187362112 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 9
I0419 09:20:59.927694 138774187362112 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/9.
I0419 09:21:00.926526 138774187362112 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0419 09:21:00.926632 138774187362112 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
I0419 09:21:00.974574 138774187362112 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.049221s
I0419 09:21:00.974743 138774187362112 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.084 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.30343127250671387 s) (per-host)
I0419 09:21:00.974792 138774187362112 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.303491s (batch_requests_ready=0.252215s, total_serialization_initiated=0.051211s, others=0.000065s)
I0419 09:21:00.974886 138774187362112 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.307670s (all_items=0.000011s, per_item={'items': '0.00001144'}, temp_paths=0.307658)
I0419 09:21:00.975740 138647827367680 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0419 09:21:00.975906 138774187362112 async_checkpointer.py:561] Finished blocking save. Time taken: 1.051664s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/9.
I0419 09:21:01.006783 138774187362112 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 09:21:01.007081 138645705062144 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0419 09:21:01.007242 138774187362112 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776590410.984453, 'wait_for_prev_duration_secs': 48.93794345855713, 'time_between_consecutive_saves_sec': 20.819929361343384, 'checkpointer_blocking_start_time': 1776590459.9242117, 'checkpointer_blocking_duration_secs': 1.0518016815185547, 'get_old_steps_start_time': 1776590460.976025, 'get_old_steps_duration_secs': 2.0265579223632812e-05, 'checkpoint_manager_blocking_start_time': 1776590410.9827461, 'checkpoint_manager_blocking_duration_secs': 50.024465799331665}
I0419 09:21:01.007346 138774187362112 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0419 09:21:01.007388 138774187362112 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 09:21:06.198568 138647835760384 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_08_checkpoint_async_true/checkpoints/9/items/array_metadatas/process_7
I0419 09:21:42.361043 138647827367680 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 37.889 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.689697265625 s) (per-host)
I0419 09:21:42.361147 138647827367680 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.385288s.
I0419 09:21:51.361100 138647827367680 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 50.385225s.
I0419 09:21:51.361377 138645705062144 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 09:21:51.361501 138645705062144 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0419 09:21:51.361568 138645705062144 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0419 09:21:51.362972 138645705062144 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0419 09:21:51.363132 138774187362112 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0419 09:21:51.363278 138774187362112 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 09:21:51.364021 138774187362112 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.136, Tokens/s/device: 13887.759, total_weights: 65536, loss: 7.181
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sun Apr 19 09:22:01 UTC 2026
EXIT_CODE=0