MaxView

Timing Test Reference Updates
‹ 16_zarr3_false_resumeCase: 16_zarr3_false_save16_zarr3_true_resume ›

Metrics: main (574ad3fb9) vs test/pipeline-scan-nnx (e27fc1e97)

Metricmain  574ad3fb9test/pipeline-scan-nnx  e27fc1e97Diff (test/pipeline-scan-nnx − main)
Parameters1.104 billion1.104 billion—
Final loss7.18107.18100
TFLOP/s92.05692.141+0.085
Tok/s13875.613888.5+12.891
Avg s/step8.3308.169-0.161
Memory %1.381.380
JAX0.9.20.8.1—

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

main  ·  574ad3fb9  ·  main_20260420_060028  ·  full log 
XPK Start: Mon Apr 20 07:26:09 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-20 07:26:33.179830: 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)
I0420 07:26:33.713930 134540780734272 max_utils.py:273] Attempting to initialize the jax distributed system...
I0420 07:26:42.755499 134540780734272 distributed.py:149] Starting JAX distributed service on [::]:8482
I0420 07:26:42.757705 134540780734272 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-false-sv-umb3t-slice-job-0-0.mt-16-zarr3-false-sv-umb3t:8482
I0420 07:26:43.914508 134540780734272 max_utils.py:284] Jax distributed system initialized!
I0420 07:26:50.227434 134540780734272 max_utils.py:800] System Information: Jax Version: 0.9.2
I0420 07:26:50.227535 134540780734272 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0420 07:26:50.227577 134540780734272 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
I0420 07:26:50.227611 134540780734272 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 07:26:50.916675 134540780734272 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 07:26:50.916951 134540780734272 checkpointing.py:677] Setting up checkpoint logger...
I0420 07:26:50.917004 134540780734272 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=False
I0420 07:26:50.917049 134540780734272 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0420 07:26:50.917410 134540780734272 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=False, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7a5c949190a0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 07:26:53.906528 134540780734272 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0420 07:26:53.906868 134540780734272 checkpoint_manager.py:708] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a476c428140>}, handler_registry=None
I0420 07:26:53.907101 134540780734272 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a476c428140>` 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`.
I0420 07:26:53.907150 134540780734272 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a48941190a0>` 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`.
I0420 07:26:53.907185 134540780734272 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 0x7a476c428140>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a476c428140>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a48941190a0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a48941190a0>}).
I0420 07:26:53.907524 134540780734272 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0420 07:26:53.907593 134540780734272 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7a485c463880> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0420 07:26:55.045131 134540780734272 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints
I0420 07:26:55.047463 134540780734272 checkpoint_manager.py:929] [process=4][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_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7a4894114f20>
I0420 07:26:55.047572 134540780734272 checkpointing.py:301] Checkpoint manager created!
I0420 07:26:55.962185 134540780734272 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 07:26:55.962301 134540780734272 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:26:56.340510 134540780734272 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:26:56.340600 134540780734272 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:26:56.356701 134540780734272 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:26:56.356756 134540780734272 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:26:56.381006 134540780734272 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:26:56.381075 134540780734272 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:26:56.397522 134540780734272 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:26:56.397586 134540780734272 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:26:56.413791 134540780734272 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:26:56.413855 134540780734272 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:26:56.438545 134540780734272 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 07:26:56.438617 134540780734272 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:26:56.459491 134540780734272 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 07:26:56.459557 134540780734272 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 07:26:56.673900 134540780734272 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 07:26:56.674006 134540780734272 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0420 07:26:58.098365 134540780734272 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0420 07:26:58.098493 134540780734272 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)
I0420 07:26:58.098545 134540780734272 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)
I0420 07:26:58.098602 134540780734272 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')
I0420 07:26:58.098651 134540780734272 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)
I0420 07:26:58.098688 134540780734272 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)
I0420 07:26:58.098739 134540780734272 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)
I0420 07:26:58.098794 134540780734272 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')
I0420 07:26:58.098836 134540780734272 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)
I0420 07:26:58.098873 134540780734272 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)
I0420 07:26:58.098920 134540780734272 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0420 07:26:58.098968 134540780734272 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0420 07:26:58.586974 134540780734272 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:26:58.587069 134540780734272 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:26:58.602346 134540780734272 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:26:58.602404 134540780734272 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:27:09.519072 134540780734272 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.
I0420 07:27:09.519877 134540780734272 metric_logger.py:301] number parameters: 1.104 billion
I0420 07:27:20.698709 134540780734272 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0420 07:27:20.902393 134540780734272 checkpointing.py:776] Waited 0.20364069938659668 seconds for step 0 to finish before starting checkpointing.
I0420 07:27:20.904982 134540780734272 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:27:20.906829 134540780734272 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 0
I0420 07:27:20.908301 134540780734272 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/0.
I0420 07:27:21.632758 134540780734272 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 07:27:21.633712 134540780734272 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:27:21.633770 134540780734272 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
I0420 07:27:21.914844 134540780734272 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.282157s
I0420 07:27:21.915016 134540780734272 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 5.361 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28773975372314453 s) (per-host)
I0420 07:27:21.915069 134540780734272 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.287802s (batch_requests_ready=0.002345s, total_serialization_initiated=0.285386s, others=0.000071s)
I0420 07:27:21.915160 134540780734272 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.291993s (all_items=0.000019s, per_item={'items': '0.00001884'}, temp_paths=0.291974)
I0420 07:27:21.915951 134540780734272 event_tracking.py:125] [process=4] [async] Finished blocking save in 1.01 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/0.
I0420 07:27:21.916286 134412607928064 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:47:21.916248
I0420 07:27:21.918202 134540780734272 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:27:21.918496 134410976347904 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:27:21.918644 134540780734272 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776670040.9049647, 'wait_for_prev_duration_secs': 6.031990051269531e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776670040.906868, 'checkpointer_blocking_duration_secs': 1.0095796585083008, 'get_old_steps_start_time': 1776670041.9164724, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776670040.9029756, 'checkpoint_manager_blocking_duration_secs': 1.0156335830688477}
I0420 07:27:21.918744 134540780734272 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0420 07:27:21.918794 134540780734272 max_utils.py:750] 
Memstats: After params initialized:
I0420 07:27:21.918838 134540780734272 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0))
I0420 07:27:21.918868 134540780734272 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0))
I0420 07:27:21.918893 134540780734272 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0))
I0420 07:27:21.918915 134540780734272 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0))
I0420 07:27:22.233490 134540780734272 metric_logger.py:196] completed step: 0, seconds: 11.179, TFLOP/s/device: 1.215, Tokens/s/device: 183.205, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0420 07:27:22.403717 134540780734272 metric_logger.py:196] completed step: 1, seconds: 1.533, TFLOP/s/device: 8.862, Tokens/s/device: 1335.735, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0420 07:27:22.809217 134540780734272 metric_logger.py:196] completed step: 2, seconds: 0.023, TFLOP/s/device: 591.903, Tokens/s/device: 89218.035, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38547.719
I0420 07:27:22.956735 134540780734272 metric_logger.py:196] completed step: 3, seconds: 0.406, TFLOP/s/device: 33.483, Tokens/s/device: 5046.933, total_weights: 65536, loss: 9.980, lm_loss: 9.980, perplexity: 21590.506
I0420 07:27:22.961368 134540780734272 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0420 07:27:23.251269 134540780734272 checkpointing.py:776] Waited 0.28986477851867676 seconds for step 5 to finish before starting checkpointing.
I0420 07:27:23.254173 134540780734272 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:27:25.112023    2793 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 07:27:27.534164 134410997036800 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/0/items/array_metadatas/process_4
I0420 07:28:03.479656 134412607928064 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.742 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.85233950614929 s) (per-host)
I0420 07:28:03.479776 134412607928064 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.563368s.
I0420 07:28:12.719443 134412607928064 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.803017s.
I0420 07:28:12.719766 134410976347904 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:28:12.719883 134410976347904 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:28:12.719935 134410976347904 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:28:12.721817 134410976347904 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0420 07:28:12.721999 134540780734272 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0420 07:28:12.722138 134540780734272 checkpoint_manager.py:1452] Waiting for previous save to complete took 49.467965 seconds. If this number is high, consider checkpointing less frequently.
I0420 07:28:12.723950 134540780734272 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 5
I0420 07:28:12.726321 134540780734272 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/5.
I0420 07:28:13.042485 134540780734272 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:28:13.042581 134540780734272 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
I0420 07:28:13.076297 134540780734272 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034917s
I0420 07:28:13.076475 134540780734272 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 40.121 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03844785690307617 s) (per-host)
I0420 07:28:13.076527 134540780734272 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038510s (batch_requests_ready=0.001881s, total_serialization_initiated=0.036560s, others=0.000069s)
I0420 07:28:13.076628 134540780734272 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.043552s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.043536)
I0420 07:28:13.077241 134540780734272 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.35 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/5.
I0420 07:28:13.077511 134412588517120 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:48:13.077484
I0420 07:28:13.086063 134540780734272 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:28:13.086267 134410976347904 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:28:13.086391 134540780734272 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776670043.2541447, 'wait_for_prev_duration_secs': 49.46796536445618, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776670092.72399, 'checkpointer_blocking_duration_secs': 0.3536231517791748, 'get_old_steps_start_time': 1776670093.0776339, 'get_old_steps_duration_secs': 2.6464462280273438e-05, 'checkpoint_manager_blocking_start_time': 1776670043.2519526, 'checkpoint_manager_blocking_duration_secs': 49.83440613746643}
I0420 07:28:13.086499 134540780734272 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0420 07:28:13.087275 134540780734272 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.766, Tokens/s/device: 13379.762, total_weights: 65536, loss: 9.460, lm_loss: 9.460, perplexity: 12840.355
I0420 07:28:13.093115 134540780734272 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.127, Tokens/s/device: 13886.440, total_weights: 65536, loss: 8.959, lm_loss: 8.959, perplexity: 7776.467
I0420 07:28:18.691542 134405719906048 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/5/items/array_metadatas/process_4
I0420 07:28:35.520355 134540780734272 metric_logger.py:196] completed step: 6, seconds: 50.130, TFLOP/s/device: 0.271, Tokens/s/device: 40.854, total_weights: 65536, loss: 8.469, lm_loss: 8.469, perplexity: 4762.740
I0420 07:28:35.667832 134540780734272 metric_logger.py:196] completed step: 7, seconds: 22.281, TFLOP/s/device: 0.610, Tokens/s/device: 91.917, total_weights: 65536, loss: 8.003, lm_loss: 8.003, perplexity: 2989.151
I0420 07:28:35.815321 134540780734272 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.180, Tokens/s/device: 13442.113, total_weights: 65536, loss: 7.572, lm_loss: 7.572, perplexity: 1943.098
I0420 07:28:35.962010 134540780734272 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0420 07:28:35.962703 134540780734272 checkpointing.py:776] Waited 0.0007138252258300781 seconds for step 9 to finish before starting checkpointing.
I0420 07:28:35.964803 134540780734272 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:28:55.811905 134412588517120 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 36.929 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.77383875846863 s) (per-host)
I0420 07:28:55.812028 134412588517120 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.734439s.
I0420 07:29:04.008492 134412588517120 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.930889s.
I0420 07:29:04.008739 134410976347904 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:29:04.008829 134410976347904 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:29:04.008876 134410976347904 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:29:04.010731 134410976347904 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0420 07:29:04.010919 134540780734272 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5.
W0420 07:29:04.011049 134540780734272 checkpoint_manager.py:1452] Waiting for previous save to complete took 28.046252 seconds. If this number is high, consider checkpointing less frequently.
I0420 07:29:04.012447 134540780734272 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 9
I0420 07:29:04.014513 134540780734272 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/9.
I0420 07:29:04.314061 134540780734272 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:29:04.314151 134540780734272 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
I0420 07:29:04.351079 134540780734272 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.037844s
I0420 07:29:04.351207 134540780734272 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 37.349 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.041301727294921875 s) (per-host)
I0420 07:29:04.351253 134540780734272 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.041356s (batch_requests_ready=0.001748s, total_serialization_initiated=0.039550s, others=0.000058s)
I0420 07:29:04.351362 134540780734272 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.045623s (all_items=0.000010s, per_item={'items': '0.00001025'}, temp_paths=0.045613)
I0420 07:29:04.352004 134540780734272 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.34 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/9.
I0420 07:29:04.352353 134410976347904 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:49:04.352300
I0420 07:29:04.354259 134540780734272 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:29:04.354564 134405719906048 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:29:04.354730 134540780734272 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776670115.964773, 'wait_for_prev_duration_secs': 28.046252489089966, 'time_between_consecutive_saves_sec': 23.242911338806152, 'checkpointer_blocking_start_time': 1776670144.0124853, 'checkpointer_blocking_duration_secs': 0.340015172958374, 'get_old_steps_start_time': 1776670144.3525176, 'get_old_steps_duration_secs': 2.5510787963867188e-05, 'checkpoint_manager_blocking_start_time': 1776670115.9629326, 'checkpoint_manager_blocking_duration_secs': 28.391764879226685}
I0420 07:29:04.354847 134540780734272 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0420 07:29:04.354890 134540780734272 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:29:09.499418 134388826236672 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_false/checkpoints/9/items/array_metadatas/process_4
I0420 07:29:46.309034 134410976347904 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.610 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.99910259246826 s) (per-host)
I0420 07:29:46.309135 134410976347904 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.956664s.
I0420 07:29:54.234055 134410976347904 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 49.881569s.
I0420 07:29:54.234379 134405719906048 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:29:54.234506 134405719906048 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:29:54.234556 134405719906048 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:29:54.237572 134405719906048 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0420 07:29:54.237753 134540780734272 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0420 07:29:54.237904 134540780734272 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:29:54.238873 134540780734272 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.056, Tokens/s/device: 13875.621, 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: Mon Apr 20 07:30:06 UTC 2026
EXIT_CODE=0
test/pipeline-scan-nnx  ·  e27fc1e97  ·  test_pipeline_scan_nnx_20260421_005327  ·  full log 
XPK Start: Tue Apr 21 02:22:49 UTC 2026
2026-04-21 02:22:53.377893: 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 00:00:1776738173.390721      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776738173.394462      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776738173.405813      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776738173.405840      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776738173.405843      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776738173.405845      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-21 02:23:12.487114: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303)
I0421 02:23:12.999870 139640734226240 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-21 02:23:22,043:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0421 02:23:22.043308 139640734226240 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-21 02:23:22,045:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-false-sv-ddy9s-slice-job-0-0.mt-16-zarr3-false-sv-ddy9s:8482
I0421 02:23:22.045587 139640734226240 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-false-sv-ddy9s-slice-job-0-0.mt-16-zarr3-false-sv-ddy9s:8482
I0421 02:23:23.395179 139640734226240 max_utils.py:284] Jax distributed system initialized!
I0421 02:23:30.550477 139640734226240 max_utils.py:800] System Information: Jax Version: 0.8.1
I0421 02:23:30.550581 139640734226240 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0421 02:23:30.550622 139640734226240 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709
I0421 02:23:30.550656 139640734226240 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0421 02:23:31.168697 139640734226240 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 02:23:31.168992 139640734226240 checkpointing.py:677] Setting up checkpoint logger...
I0421 02:23:31.169048 139640734226240 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=False
I0421 02:23:31.169092 139640734226240 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0421 02:23:31.169451 139640734226240 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=False, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7f0018779130>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 02:23:34.301450 139640734226240 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0421 02:23:34.301793 139640734226240 checkpoint_manager.py:709] [process=1][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eebd81c1880>}, handler_registry=None
I0421 02:23:34.302036 139640734226240 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eebd81c1880>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`.
I0421 02:23:34.302088 139640734226240 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eebc07735f0>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`.
I0421 02:23:34.302128 139640734226240 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 0x7eebd81c1880>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eebd81c1880>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eebc07735f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eebc07735f0>}).
I0421 02:23:34.302629 139640734226240 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0421 02:23:34.302708 139640734226240 async_checkpointer.py:177] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7eebc01a0040> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0421 02:23:36.643530 139640734226240 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints
I0421 02:23:37.080663 139640734226240 checkpoint_manager.py:929] [process=1][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_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7eebc076d3d0>
I0421 02:23:37.080835 139640734226240 checkpointing.py:301] Checkpoint manager created!
I0421 02:23:37.988302 139640734226240 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 02:23:37.988418 139640734226240 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 02:23:38.357792 139640734226240 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 02:23:38.357888 139640734226240 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 02:23:38.373735 139640734226240 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 02:23:38.373796 139640734226240 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 02:23:38.396415 139640734226240 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 02:23:38.396481 139640734226240 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 02:23:38.412349 139640734226240 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 02:23:38.412421 139640734226240 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 02:23:38.431086 139640734226240 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 02:23:38.431192 139640734226240 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 02:23:38.458885 139640734226240 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 02:23:38.458961 139640734226240 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 02:23:38.478501 139640734226240 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 02:23:38.478565 139640734226240 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0421 02:23:38.669096 139640734226240 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 02:23:38.669205 139640734226240 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0421 02:23:40.108535 139640734226240 maxtext_utils.py:1501]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0421 02:23:40.108672 139640734226240 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)
I0421 02:23:40.108726 139640734226240 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)
I0421 02:23:40.108787 139640734226240 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')
I0421 02:23:40.108841 139640734226240 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)
I0421 02:23:40.108881 139640734226240 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)
I0421 02:23:40.108935 139640734226240 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)
I0421 02:23:40.108990 139640734226240 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')
I0421 02:23:40.109034 139640734226240 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)
I0421 02:23:40.109071 139640734226240 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)
I0421 02:23:40.109121 139640734226240 maxtext_utils.py:1501]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0421 02:23:40.109177 139640734226240 maxtext_utils.py:1501]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')

I0421 02:23:40.617881 139640734226240 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 02:23:40.617983 139640734226240 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 02:23:40.633060 139640734226240 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 02:23:40.633121 139640734226240 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 02:23:51.282921 139640734226240 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.
I0421 02:23:51.283791 139640734226240 metric_logger.py:289] number parameters: 1.104 billion
I0421 02:24:02.457964 139640734226240 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0421 02:24:02.611490 139640734226240 checkpointing.py:776] Waited 0.15351438522338867 seconds for step 0 to finish before starting checkpointing.
I0421 02:24:02.614198 139640734226240 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 02:24:02.615856 139640734226240 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 0
I0421 02:24:02.618768 139640734226240 async_checkpointer.py:452] [process=1] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/0.
I0421 02:24:04.039124 139640734226240 signaling_client.py:364] Using JaxDistributedSignalingClient
I0421 02:24:04.040060 139640734226240 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0421 02:24:04.040115 139640734226240 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
I0421 02:24:04.292273 139640734226240 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.253228s
I0421 02:24:04.292460 139640734226240 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.010 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5124797821044922 s) (per-host)
I0421 02:24:04.292514 139640734226240 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.512543s (batch_requests_ready=0.255690s, total_serialization_initiated=0.256783s, others=0.000071s)
I0421 02:24:04.292604 139640734226240 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.516651s (all_items=0.000019s, per_item={'items': '0.00001907'}, temp_paths=0.516632)
I0421 02:24:04.293358 139517977683712 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started.
I0421 02:24:04.293526 139640734226240 async_checkpointer.py:561] Finished blocking save. Time taken: 1.677605s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/0.
I0421 02:24:04.758911 139640734226240 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 02:24:04.759295 139514186016512 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save.
I0421 02:24:04.759487 139640734226240 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776738242.6141813, 'wait_for_prev_duration_secs': 6.341934204101562e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776738242.6158984, 'checkpointer_blocking_duration_secs': 1.6777002811431885, 'get_old_steps_start_time': 1776738244.2936184, 'get_old_steps_duration_secs': 2.2172927856445312e-05, 'checkpoint_manager_blocking_start_time': 1776738242.6121006, 'checkpoint_manager_blocking_duration_secs': 2.147345781326294}
I0421 02:24:04.759594 139640734226240 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0421 02:24:04.759644 139640734226240 max_utils.py:750] 
Memstats: After params initialized:
I0421 02:24:04.759699 139640734226240 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0))
I0421 02:24:04.759733 139640734226240 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0))
I0421 02:24:04.759760 139640734226240 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0))
I0421 02:24:04.759784 139640734226240 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0))
I0421 02:24:05.028884 139640734226240 metric_logger.py:185] completed step: 0, seconds: 11.174, TFLOP/s/device: 1.216, Tokens/s/device: 183.282, total_weights: 65536, loss: 10.874
I0421 02:24:05.208652 139640734226240 metric_logger.py:185] completed step: 1, seconds: 2.570, TFLOP/s/device: 5.287, Tokens/s/device: 796.988, total_weights: 65536, loss: 10.874
I0421 02:24:05.600974 139640734226240 metric_logger.py:185] completed step: 2, seconds: 0.033, TFLOP/s/device: 416.068, Tokens/s/device: 62714.356, total_weights: 65536, loss: 10.560
I0421 02:24:05.748316 139640734226240 metric_logger.py:185] completed step: 3, seconds: 0.393, TFLOP/s/device: 34.586, Tokens/s/device: 5213.186, total_weights: 65536, loss: 9.980
I0421 02:24:05.753013 139640734226240 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0421 02:24:06.043082 139640734226240 checkpointing.py:776] Waited 0.2900390625 seconds for step 5 to finish before starting checkpointing.
I0421 02:24:06.045950 139640734226240 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 02:24:08.189666    2642 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0421 02:24:10.535385 139517986076416 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/0/items/array_metadatas/process_1
I0421 02:24:46.050826 139517977683712 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 37.369 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.270803451538086 s) (per-host)
I0421 02:24:46.050954 139517977683712 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.757471s.
I0421 02:24:54.486711 139517977683712 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 50.193212s.
I0421 02:24:54.487043 139514186016512 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 02:24:54.487190 139514186016512 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save.
I0421 02:24:54.487250 139514186016512 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 02:24:54.488939 139514186016512 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 02:24:54.489102 139640734226240 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0421 02:24:54.489230 139640734226240 checkpoint_manager.py:1458] Waiting for previous save to complete took 48.443288 seconds. If this number is high, consider checkpointing less frequently.
I0421 02:24:54.491296 139640734226240 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 5
I0421 02:24:54.495305 139640734226240 async_checkpointer.py:452] [process=1] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/5.
I0421 02:24:55.460136 139640734226240 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0421 02:24:55.460239 139640734226240 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
I0421 02:24:55.498973 139640734226240 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.040016s
I0421 02:24:55.499148 139640734226240 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.206 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2962825298309326 s) (per-host)
I0421 02:24:55.499202 139640734226240 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.296346s (batch_requests_ready=0.254417s, total_serialization_initiated=0.041858s, others=0.000071s)
I0421 02:24:55.499288 139640734226240 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.301229s (all_items=0.000016s, per_item={'items': '0.00001574'}, temp_paths=0.301213)
I0421 02:24:55.500199 139517986076416 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started.
I0421 02:24:55.500360 139640734226240 async_checkpointer.py:561] Finished blocking save. Time taken: 1.008991s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/5.
I0421 02:24:55.946175 139640734226240 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 02:24:55.946583 139514186016512 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save.
I0421 02:24:55.946756 139640734226240 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776738246.045917, 'wait_for_prev_duration_secs': 48.44328784942627, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776738294.4913354, 'checkpointer_blocking_duration_secs': 1.0091440677642822, 'get_old_steps_start_time': 1776738295.5004985, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776738246.0437467, 'checkpoint_manager_blocking_duration_secs': 49.90297245979309}
I0421 02:24:55.946873 139640734226240 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0421 02:24:55.947449 139640734226240 metric_logger.py:185] completed step: 4, seconds: 0.152, TFLOP/s/device: 89.120, Tokens/s/device: 13433.208, total_weights: 65536, loss: 9.460
I0421 02:24:55.953342 139640734226240 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.246, Tokens/s/device: 13904.259, total_weights: 65536, loss: 8.959
I0421 02:25:15.825735 139640734226240 metric_logger.py:185] completed step: 6, seconds: 50.199, TFLOP/s/device: 0.271, Tokens/s/device: 40.797, total_weights: 65536, loss: 8.469
I0421 02:25:15.973240 139640734226240 metric_logger.py:185] completed step: 7, seconds: 19.726, TFLOP/s/device: 0.689, Tokens/s/device: 103.822, total_weights: 65536, loss: 8.003
I0421 02:25:16.120765 139640734226240 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.261, Tokens/s/device: 13454.388, total_weights: 65536, loss: 7.572
I0421 02:25:16.267973 139640734226240 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0421 02:25:16.268654 139640734226240 checkpointing.py:776] Waited 0.0007011890411376953 seconds for step 9 to finish before starting checkpointing.
I0421 02:25:16.270715 139640734226240 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 02:25:21.044074 139514211194624 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/5/items/array_metadatas/process_1
I0421 02:25:56.690418 139517986076416 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 25.690 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 61.487502574920654 s) (per-host)
I0421 02:25:56.690537 139517986076416 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 61.190227s.
I0421 02:26:05.148391 139517986076416 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 69.648066s.
I0421 02:26:05.148690 139514186016512 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 02:26:05.148827 139514186016512 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save.
I0421 02:26:05.148875 139514186016512 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0421 02:26:05.151226 139514186016512 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0421 02:26:05.151431 139640734226240 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5.
W0421 02:26:05.151567 139640734226240 checkpoint_manager.py:1458] Waiting for previous save to complete took 48.880863 seconds. If this number is high, consider checkpointing less frequently.
I0421 02:26:05.153315 139640734226240 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 9
I0421 02:26:05.156828 139640734226240 async_checkpointer.py:452] [process=1] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/9.
I0421 02:26:06.126791 139640734226240 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0421 02:26:06.126885 139640734226240 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
I0421 02:26:06.167726 139640734226240 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.041912s
I0421 02:26:06.167896 139640734226240 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.263 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.293076753616333 s) (per-host)
I0421 02:26:06.167943 139640734226240 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.293134s (batch_requests_ready=0.249150s, total_serialization_initiated=0.043921s, others=0.000063s)
I0421 02:26:06.168030 139640734226240 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.297289s (all_items=0.000011s, per_item={'items': '0.00001097'}, temp_paths=0.297278)
I0421 02:26:06.168840 139514709174016 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started.
I0421 02:26:06.168995 139640734226240 async_checkpointer.py:561] Finished blocking save. Time taken: 1.015614s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/9.
I0421 02:26:07.039093 139640734226240 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 02:26:07.039486 139514186016512 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save.
I0421 02:26:07.039658 139640734226240 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776738316.2706883, 'wait_for_prev_duration_secs': 48.880863428115845, 'time_between_consecutive_saves_sec': 21.781707763671875, 'checkpointer_blocking_start_time': 1776738365.1533546, 'checkpointer_blocking_duration_secs': 1.0157461166381836, 'get_old_steps_start_time': 1776738366.1691127, 'get_old_steps_duration_secs': 2.1457672119140625e-05, 'checkpoint_manager_blocking_start_time': 1776738316.268877, 'checkpoint_manager_blocking_duration_secs': 50.770747423172}
I0421 02:26:07.039767 139640734226240 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0421 02:26:07.039807 139640734226240 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 02:26:13.496528 139517977683712 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_false/checkpoints/9/items/array_metadatas/process_1
I0421 02:26:48.799313 139514709174016 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 36.799 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.92444825172424 s) (per-host)
I0421 02:26:48.799441 139514709174016 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.630486s.
I0421 02:26:57.569154 139514709174016 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 51.400185s.
I0421 02:26:57.569486 139514186016512 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 02:26:57.569611 139514186016512 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save.
I0421 02:26:57.569656 139514186016512 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0421 02:26:57.571148 139514186016512 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0421 02:26:57.571316 139640734226240 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0421 02:26:57.571478 139640734226240 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 02:26:57.572119 139640734226240 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.141, Tokens/s/device: 13888.512, 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: Tue Apr 21 02:27:10 UTC 2026
EXIT_CODE=0