MaxView

Timing Test Reference Updates
‹ 16_zarr3_true_resumeCase: 16_zarr3_true_save— ›

Metrics: main (574ad3fb9) vs feat/nnx-set-defaults-true (e27fc1e97)

Metricmain  574ad3fb9feat/nnx-set-defaults-true  e27fc1e97Diff (feat/nnx-set-defaults-true − main)
Parameters1.104 billion1.104 billion—
Final loss7.18107.18100
TFLOP/s92.05492.147+0.093
Tok/s13875.313889.5+14.115
Avg s/step7.7077.410-0.297
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 07:16:14 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 07:16:38.242202: 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 07:16:38.773853 137542338553664 max_utils.py:273] Attempting to initialize the jax distributed system...
I0420 07:16:47.816251 137542338553664 distributed.py:149] Starting JAX distributed service on [::]:8482
I0420 07:16:47.818670 137542338553664 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-true-sv-vluci-slice-job-0-0.mt-16-zarr3-true-sv-vluci:8482
I0420 07:16:48.926547 137542338553664 max_utils.py:284] Jax distributed system initialized!
I0420 07:16:55.242302 137542338553664 max_utils.py:800] System Information: Jax Version: 0.9.2
I0420 07:16:55.242430 137542338553664 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0420 07:16:55.242474 137542338553664 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 07:16:55.242511 137542338553664 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 07:16:55.942656 137542338553664 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 07:16:55.942933 137542338553664 checkpointing.py:677] Setting up checkpoint logger...
I0420 07:16:55.942986 137542338553664 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0420 07:16:55.943032 137542338553664 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0420 07:16:55.943374 137542338553664 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 0x7d178410a6c0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 07:16:58.806046 137542338553664 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0420 07:16:58.806276 137542338553664 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 0x7d02f0643050>}, handler_registry=None
I0420 07:16:58.806525 137542338553664 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d02f0643050>` 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 07:16:58.806586 137542338553664 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d02f0644050>` 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 07:16:58.806628 137542338553664 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 0x7d02f0643050>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d02f0643050>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d02f0644050>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d02f0644050>}).
I0420 07:16:58.806951 137542338553664 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0420 07:16:58.807021 137542338553664 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d02f03db880> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0420 07:16:59.976365 137542338553664 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_true/checkpoints
I0420 07:17:00.276830 137542338553664 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_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d02f079f8c0>
I0420 07:17:00.276997 137542338553664 checkpointing.py:301] Checkpoint manager created!
I0420 07:17:01.196409 137542338553664 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 07:17:01.196519 137542338553664 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:17:01.571112 137542338553664 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:17:01.571200 137542338553664 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:17:01.587372 137542338553664 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:17:01.587427 137542338553664 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:17:01.611468 137542338553664 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 07:17:01.611536 137542338553664 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:17:01.627722 137542338553664 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 07:17:01.627784 137542338553664 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:17:01.644080 137542338553664 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 07:17:01.644138 137542338553664 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:17:01.668555 137542338553664 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 07:17:01.668625 137542338553664 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:17:01.693949 137542338553664 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 07:17:01.694046 137542338553664 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 07:17:01.908438 137542338553664 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 07:17:01.908540 137542338553664 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0420 07:17:03.342322 137542338553664 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0420 07:17:03.342477 137542338553664 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 07:17:03.342529 137542338553664 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 07:17:03.342589 137542338553664 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 07:17:03.342643 137542338553664 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 07:17:03.342680 137542338553664 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 07:17:03.342733 137542338553664 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 07:17:03.342785 137542338553664 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 07:17:03.342824 137542338553664 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 07:17:03.342859 137542338553664 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 07:17:03.342905 137542338553664 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0420 07:17:03.342952 137542338553664 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0420 07:17:03.833580 137542338553664 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:17:03.833679 137542338553664 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:17:03.848945 137542338553664 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:17:03.849003 137542338553664 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:17:14.566355 137542338553664 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 07:17:14.567132 137542338553664 metric_logger.py:301] number parameters: 1.104 billion
I0420 07:17:26.014483 137542338553664 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0420 07:17:26.168104 137542338553664 checkpointing.py:776] Waited 0.15360283851623535 seconds for step 0 to finish before starting checkpointing.
I0420 07:17:26.170780 137542338553664 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:17:26.172412 137542338553664 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 0
I0420 07:17:26.173855 137542338553664 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_true/checkpoints/0.
I0420 07:17:26.504199 137542338553664 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 07:17:26.505139 137542338553664 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:17:26.505197 137542338553664 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 07:17:26.777873 137542338553664 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.273744s
I0420 07:17:26.778046 137542338553664 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 5.525 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2792205810546875 s) (per-host)
I0420 07:17:26.778098 137542338553664 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.279282s (batch_requests_ready=0.002289s, total_serialization_initiated=0.276924s, others=0.000069s)
I0420 07:17:26.778188 137542338553664 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.283413s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.283395)
I0420 07:17:26.779043 137542338553664 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.61 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_true/checkpoints/0.
I0420 07:17:26.779329 137412158699264 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:37:26.779293
I0420 07:17:26.790814 137542338553664 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:17:26.791093 137410552416000 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:17:26.791249 137542338553664 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_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669446.1707616, 'wait_for_prev_duration_secs': 5.936622619628906e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776669446.172449, 'checkpointer_blocking_duration_secs': 0.6070399284362793, 'get_old_steps_start_time': 1776669446.7795155, 'get_old_steps_duration_secs': 2.8371810913085938e-05, 'checkpoint_manager_blocking_start_time': 1776669446.1686616, 'checkpoint_manager_blocking_duration_secs': 0.6225507259368896}
I0420 07:17:26.791373 137542338553664 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0420 07:17:26.791424 137542338553664 max_utils.py:750] 
Memstats: After params initialized:
I0420 07:17:26.791473 137542338553664 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0))
I0420 07:17:26.791506 137542338553664 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0))
I0420 07:17:26.791534 137542338553664 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0))
I0420 07:17:26.791559 137542338553664 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0))
I0420 07:17:27.106599 137542338553664 metric_logger.py:196] completed step: 0, seconds: 11.447, TFLOP/s/device: 1.187, Tokens/s/device: 178.908, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0420 07:17:27.278324 137542338553664 metric_logger.py:196] completed step: 1, seconds: 1.091, TFLOP/s/device: 12.458, Tokens/s/device: 1877.876, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0420 07:17:27.688173 137542338553664 metric_logger.py:196] completed step: 2, seconds: 0.024, TFLOP/s/device: 558.245, Tokens/s/device: 84144.788, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38547.719
I0420 07:17:27.835178 137542338553664 metric_logger.py:196] completed step: 3, seconds: 0.410, TFLOP/s/device: 33.173, Tokens/s/device: 5000.256, total_weights: 65536, loss: 9.980, lm_loss: 9.980, perplexity: 21590.506
I0420 07:17:27.839765 137542338553664 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0420 07:17:28.129288 137542338553664 checkpointing.py:776] Waited 0.2894906997680664 seconds for step 5 to finish before starting checkpointing.
I0420 07:17:28.132366 137542338553664 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:17:29.739420    2865 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 07:17:32.252832 137410560808704 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_true/checkpoints/0/items/array_metadatas/process_4
I0420 07:18:03.264580 137412158699264 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 42.964 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.765721559524536 s) (per-host)
I0420 07:18:03.264697 137412158699264 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.485245s.
I0420 07:18:12.005557 137412158699264 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 45.226089s.
I0420 07:18:12.005851 137410552416000 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:18:12.005975 137410552416000 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:18:12.006026 137410552416000 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:18:12.008569 137410552416000 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0420 07:18:12.008754 137542338553664 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 07:18:12.008895 137542338553664 checkpoint_manager.py:1452] Waiting for previous save to complete took 43.876545 seconds. If this number is high, consider checkpointing less frequently.
I0420 07:18:12.010880 137542338553664 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 5
I0420 07:18:12.013251 137542338553664 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_true/checkpoints/5.
I0420 07:18:12.741195 137542338553664 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:18:12.741293 137542338553664 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 07:18:12.774454 137542338553664 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034340s
I0420 07:18:12.774657 137542338553664 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 40.703 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03789854049682617 s) (per-host)
I0420 07:18:12.774709 137542338553664 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.037960s (batch_requests_ready=0.001872s, total_serialization_initiated=0.036018s, others=0.000069s)
I0420 07:18:12.774796 137542338553664 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.043129s (all_items=0.000016s, per_item={'items': '0.00001621'}, temp_paths=0.043113)
I0420 07:18:12.775530 137542338553664 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.76 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_16_zarr3_true/checkpoints/5.
I0420 07:18:12.775805 137410552416000 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:38:12.775782
I0420 07:18:12.785679 137542338553664 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:18:12.785980 137388747613952 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:18:12.786143 137542338553664 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_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669448.1323204, 'wait_for_prev_duration_secs': 43.876544713974, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776669492.0109177, 'checkpointer_blocking_duration_secs': 0.7649953365325928, 'get_old_steps_start_time': 1776669492.7759364, 'get_old_steps_duration_secs': 2.9325485229492188e-05, 'checkpoint_manager_blocking_start_time': 1776669448.129948, 'checkpoint_manager_blocking_duration_secs': 44.65616154670715}
I0420 07:18:12.786257 137542338553664 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0420 07:18:12.787040 137542338553664 metric_logger.py:196] completed step: 4, seconds: 0.154, TFLOP/s/device: 88.438, Tokens/s/device: 13330.296, total_weights: 65536, loss: 9.460, lm_loss: 9.460, perplexity: 12840.355
I0420 07:18:12.792789 137542338553664 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.421, Tokens/s/device: 13930.741, total_weights: 65536, loss: 8.959, lm_loss: 8.959, perplexity: 7776.467
I0420 07:18:17.971905 137410560808704 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_true/checkpoints/5/items/array_metadatas/process_4
I0420 07:18:35.226711 137542338553664 metric_logger.py:196] completed step: 6, seconds: 44.952, TFLOP/s/device: 0.302, Tokens/s/device: 45.560, total_weights: 65536, loss: 8.469, lm_loss: 8.469, perplexity: 4762.740
I0420 07:18:35.374139 137542338553664 metric_logger.py:196] completed step: 7, seconds: 22.288, TFLOP/s/device: 0.610, Tokens/s/device: 91.889, total_weights: 65536, loss: 8.003, lm_loss: 8.003, perplexity: 2989.151
I0420 07:18:35.521697 137542338553664 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.411, Tokens/s/device: 13476.965, total_weights: 65536, loss: 7.572, lm_loss: 7.572, perplexity: 1943.098
I0420 07:18:35.668426 137542338553664 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0420 07:18:35.669105 137542338553664 checkpointing.py:776] Waited 0.0006990432739257812 seconds for step 9 to finish before starting checkpointing.
I0420 07:18:35.671230 137542338553664 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:18:55.064854 137410552416000 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.318 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.328054666519165 s) (per-host)
I0420 07:18:55.064978 137410552416000 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.289090s.
I0420 07:19:02.974133 137410552416000 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.198228s.
I0420 07:19:02.974433 137388747613952 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:19:02.974554 137388747613952 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:19:02.974602 137388747613952 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:19:02.976805 137388747613952 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0420 07:19:02.976962 137542338553664 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 07:19:02.977081 137542338553664 checkpoint_manager.py:1452] Waiting for previous save to complete took 27.305858 seconds. If this number is high, consider checkpointing less frequently.
I0420 07:19:02.981086 137542338553664 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 9
I0420 07:19:02.983196 137542338553664 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_true/checkpoints/9.
I0420 07:19:03.294789 137542338553664 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:19:03.294882 137542338553664 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 07:19:03.327592 137542338553664 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.033633s
I0420 07:19:03.327753 137542338553664 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 41.559 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.037117958068847656 s) (per-host)
I0420 07:19:03.327803 137542338553664 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.037177s (batch_requests_ready=0.001746s, total_serialization_initiated=0.035367s, others=0.000064s)
I0420 07:19:03.327901 137542338553664 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.041232s (all_items=0.000010s, per_item={'items': '0.00001025'}, temp_paths=0.041222)
I0420 07:19:03.328608 137542338553664 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_true/checkpoints/9.
I0420 07:19:03.328880 137388747613952 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:39:03.328858
I0420 07:19:03.338919 137542338553664 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:19:03.339206 137410560808704 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:19:03.339380 137542338553664 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_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669515.6711993, 'wait_for_prev_duration_secs': 27.30585789680481, 'time_between_consecutive_saves_sec': 23.662587881088257, 'checkpointer_blocking_start_time': 1776669542.981126, 'checkpointer_blocking_duration_secs': 0.34784626960754395, 'get_old_steps_start_time': 1776669543.3289897, 'get_old_steps_duration_secs': 2.5987625122070312e-05, 'checkpoint_manager_blocking_start_time': 1776669515.6693308, 'checkpoint_manager_blocking_duration_secs': 27.670016527175903}
I0420 07:19:03.339495 137542338553664 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0420 07:19:03.339537 137542338553664 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:19:08.417920 137409990600448 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_true/checkpoints/9/items/array_metadatas/process_4
I0420 07:19:45.205867 137388747613952 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.686 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.91518783569336 s) (per-host)
I0420 07:19:45.205987 137388747613952 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.877038s.
I0420 07:19:52.698626 137388747613952 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 49.369661s.
I0420 07:19:52.698922 137410560808704 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:19:52.699042 137410560808704 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:19:52.699084 137410560808704 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:19:52.704137 137410560808704 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0420 07:19:52.704298 137542338553664 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 07:19:52.704495 137542338553664 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:19:52.705415 137542338553664 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.054, Tokens/s/device: 13875.339, 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 07:20:05 UTC 2026
EXIT_CODE=0
feat/nnx-set-defaults-true  ·  e27fc1e97  ·  feat_nnx_set_defaults_true_20260420_190404  ·  full log 
XPK Start: Mon Apr 20 20:34:31 UTC 2026
2026-04-20 20:34:35.704693: 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 00:00:1776717275.717702      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776717275.721444      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776717275.732680      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776717275.732702      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776717275.732705      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776717275.732707      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-20 20:34:54.915155: 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 20:34:55.436902 135426393175872 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-20 20:35:04,479:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0420 20:35:04.479280 135426393175872 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-20 20:35:04,481:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-true-sv-gzvb4-slice-job-0-0.mt-16-zarr3-true-sv-gzvb4:8482
I0420 20:35:04.481698 135426393175872 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-true-sv-gzvb4-slice-job-0-0.mt-16-zarr3-true-sv-gzvb4:8482
I0420 20:35:05.348736 135426393175872 max_utils.py:284] Jax distributed system initialized!
I0420 20:35:11.271448 135426393175872 max_utils.py:800] System Information: Jax Version: 0.8.1
I0420 20:35:11.271554 135426393175872 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0420 20:35:11.271595 135426393175872 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
I0420 20:35:11.271629 135426393175872 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 20:35:11.893594 135426393175872 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 20:35:11.894225 135426393175872 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 20:35:11.894429 135426393175872 checkpointing.py:688] Setting up checkpoint logger...
I0420 20:35:11.894496 135426393175872 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0420 20:35:11.894560 135426393175872 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0420 20:35:11.894935 135426393175872 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 0x7b2ade375040>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 20:35:14.815028 135426393175872 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0420 20:35:14.815375 135426393175872 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 0x7b1844b39730>}, handler_registry=None
I0420 20:35:14.815610 135426393175872 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b1844b39730>` 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 20:35:14.815671 135426393175872 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b1844b3e6f0>` 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 20:35:14.815708 135426393175872 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 0x7b1844b39730>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b1844b39730>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b1844b3e6f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b1844b3e6f0>}).
I0420 20:35:14.816251 135426393175872 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0420 20:35:14.816331 135426393175872 async_checkpointer.py:177] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b16f0410180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0420 20:35:15.553971 135426393175872 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints
I0420 20:35:15.985222 135426393175872 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_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b1844b3b1d0>
I0420 20:35:15.985394 135426393175872 checkpointing.py:302] Checkpoint manager created!
I0420 20:35:16.877164 135426393175872 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 20:35:16.877276 135426393175872 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:35:17.246869 135426393175872 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 20:35:17.246965 135426393175872 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:35:17.262723 135426393175872 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 20:35:17.262784 135426393175872 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:35:17.285349 135426393175872 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:35:17.285419 135426393175872 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:35:17.301234 135426393175872 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:35:17.301294 135426393175872 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:35:17.317021 135426393175872 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:35:17.317082 135426393175872 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:35:17.341635 135426393175872 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 20:35:17.341715 135426393175872 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:35:17.361022 135426393175872 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 20:35:17.361089 135426393175872 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 20:35:17.548648 135426393175872 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 20:35:17.548766 135426393175872 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0420 20:35:19.006975 135426393175872 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0420 20:35:19.007113 135426393175872 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0420 20:35:19.007169 135426393175872 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0420 20:35:19.007230 135426393175872 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   PartitionSpec('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0420 20:35:19.007284 135426393175872 maxtext_utils.py:1740]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0420 20:35:19.007323 135426393175872 maxtext_utils.py:1740]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0420 20:35:19.007375 135426393175872 maxtext_utils.py:1740]  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)
I0420 20:35:19.007427 135426393175872 maxtext_utils.py:1740]  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')
I0420 20:35:19.007467 135426393175872 maxtext_utils.py:1740]  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)
I0420 20:35:19.007506 135426393175872 maxtext_utils.py:1740]  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)
I0420 20:35:19.007556 135426393175872 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0420 20:35:19.007605 135426393175872 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')

I0420 20:35:19.504562 135426393175872 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 20:35:19.504669 135426393175872 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 20:35:19.519610 135426393175872 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 20:35:19.519680 135426393175872 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 20:35:30.430575 135426393175872 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 20:35:30.431415 135426393175872 metric_logger.py:289] number parameters: 1.104 billion
I0420 20:35:41.618473 135426393175872 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0420 20:35:41.771194 135426393175872 checkpointing.py:798] Waited 0.15270471572875977 seconds for step 0 to finish before starting checkpointing.
I0420 20:35:41.773648 135426393175872 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 20:35:41.775549 135426393175872 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 0
I0420 20:35:41.778381 135426393175872 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/0.
I0420 20:35:42.794337 135426393175872 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 20:35:42.795334 135426393175872 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:35:42.795394 135426393175872 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 20:35:43.051083 135426393175872 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.256823s
I0420 20:35:43.051256 135426393175872 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.843 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5426106452941895 s) (per-host)
I0420 20:35:43.051308 135426393175872 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.542672s (batch_requests_ready=0.282212s, total_serialization_initiated=0.260390s, others=0.000070s)
I0420 20:35:43.051398 135426393175872 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.546933s (all_items=0.000020s, per_item={'items': '0.00001955'}, temp_paths=0.546914)
I0420 20:35:43.052323 135305554290432 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:35:43.052496 135426393175872 async_checkpointer.py:561] Finished blocking save. Time taken: 1.276879s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/0.
I0420 20:35:43.074258 135426393175872 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:35:43.074511 135301225752320 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:35:43.074633 135426393175872 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776717341.77363, 'wait_for_prev_duration_secs': 7.891654968261719e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776717341.775588, 'checkpointer_blocking_duration_secs': 1.277015209197998, 'get_old_steps_start_time': 1776717343.0526245, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776717341.771816, 'checkpoint_manager_blocking_duration_secs': 1.302778720855713}
I0420 20:35:43.074749 135426393175872 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0420 20:35:43.074799 135426393175872 max_utils.py:750] 
Memstats: After params initialized:
I0420 20:35:43.074849 135426393175872 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0420 20:35:43.074881 135426393175872 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0420 20:35:43.074908 135426393175872 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0420 20:35:43.074932 135426393175872 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0420 20:35:43.342088 135426393175872 metric_logger.py:185] completed step: 0, seconds: 11.187, TFLOP/s/device: 1.215, Tokens/s/device: 183.070, total_weights: 65536, loss: 10.874
I0420 20:35:43.522459 135426393175872 metric_logger.py:185] completed step: 1, seconds: 1.722, TFLOP/s/device: 7.889, Tokens/s/device: 1189.135, total_weights: 65536, loss: 10.874
I0420 20:35:43.943585 135426393175872 metric_logger.py:185] completed step: 2, seconds: 0.033, TFLOP/s/device: 406.557, Tokens/s/device: 61280.670, total_weights: 65536, loss: 10.560
I0420 20:35:44.091103 135426393175872 metric_logger.py:185] completed step: 3, seconds: 0.422, TFLOP/s/device: 32.231, Tokens/s/device: 4858.157, total_weights: 65536, loss: 9.980
I0420 20:35:44.095832 135426393175872 checkpointing.py:794] Waiting for step 5 to finish before checkpoint...
I0420 20:35:44.385869 135426393175872 checkpointing.py:798] Waited 0.29000353813171387 seconds for step 5 to finish before starting checkpointing.
I0420 20:35:44.388731 135426393175872 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:35:46.222838    2572 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 20:35:48.131727 135305562683136 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/0/items/array_metadatas/process_7
I0420 20:36:20.087028 135305554290432 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 42.035 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.5783257484436 s) (per-host)
I0420 20:36:20.087154 135305554290432 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.034718s.
I0420 20:36:28.018297 135305554290432 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 44.965843s.
I0420 20:36:28.018545 135301225752320 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:36:28.018614 135301225752320 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:36:28.018699 135301225752320 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:36:28.020328 135301225752320 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0420 20:36:28.020522 135426393175872 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.
W0420 20:36:28.020697 135426393175872 checkpoint_manager.py:1458] Waiting for previous save to complete took 43.631969 seconds. If this number is high, consider checkpointing less frequently.
I0420 20:36:28.022579 135426393175872 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 5
I0420 20:36:28.026670 135426393175872 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/5.
I0420 20:36:28.588153 135426393175872 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:36:28.588260 135426393175872 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 20:36:28.637923 135426393175872 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.051553s
I0420 20:36:28.638089 135426393175872 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.853 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.31785154342651367 s) (per-host)
I0420 20:36:28.638142 135426393175872 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.317912s (batch_requests_ready=0.264450s, total_serialization_initiated=0.053394s, others=0.000068s)
I0420 20:36:28.638242 135426393175872 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.322788s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.322773)
I0420 20:36:28.638987 135301267715840 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:36:28.639142 135426393175872 async_checkpointer.py:561] Finished blocking save. Time taken: 0.616500s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/5.
I0420 20:36:29.058922 135426393175872 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:36:29.059300 135301225752320 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:36:29.059476 135426393175872 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776717344.3887029, 'wait_for_prev_duration_secs': 43.63196897506714, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776717388.0226204, 'checkpointer_blocking_duration_secs': 0.6165950298309326, 'get_old_steps_start_time': 1776717388.6392329, 'get_old_steps_duration_secs': 2.288818359375e-05, 'checkpoint_manager_blocking_start_time': 1776717344.3864667, 'checkpoint_manager_blocking_duration_secs': 44.67297315597534}
I0420 20:36:29.059582 135426393175872 checkpointing.py:409] Started an asynchronous checkpoint save for step 5
I0420 20:36:29.060216 135426393175872 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 89.044, Tokens/s/device: 13421.675, total_weights: 65536, loss: 9.460
I0420 20:36:29.066456 135426393175872 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.170, Tokens/s/device: 13892.940, total_weights: 65536, loss: 8.959
I0420 20:36:48.153185 135426393175872 metric_logger.py:185] completed step: 6, seconds: 44.969, TFLOP/s/device: 0.302, Tokens/s/device: 45.542, total_weights: 65536, loss: 8.469
I0420 20:36:48.300810 135426393175872 metric_logger.py:185] completed step: 7, seconds: 18.941, TFLOP/s/device: 0.717, Tokens/s/device: 108.128, total_weights: 65536, loss: 8.003
I0420 20:36:48.448193 135426393175872 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.265, Tokens/s/device: 13454.918, total_weights: 65536, loss: 7.572
I0420 20:36:48.595278 135426393175872 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0420 20:36:48.595979 135426393175872 checkpointing.py:798] Waited 0.0007193088531494141 seconds for step 9 to finish before starting checkpointing.
I0420 20:36:48.598072 135426393175872 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:36:52.583528 135305562683136 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/5/items/array_metadatas/process_7
I0420 20:37:29.353746 135301267715840 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 25.881 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 61.033466815948486 s) (per-host)
I0420 20:37:29.353866 135301267715840 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 60.714761s.
I0420 20:37:37.571894 135301267715840 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 68.932772s.
I0420 20:37:37.572192 135301225752320 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:37:37.572326 135301225752320 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:37:37.572374 135301225752320 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:37:37.573907 135301225752320 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0420 20:37:37.574102 135426393175872 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.
W0420 20:37:37.574246 135426393175872 checkpoint_manager.py:1458] Waiting for previous save to complete took 48.976176 seconds. If this number is high, consider checkpointing less frequently.
I0420 20:37:37.575854 135426393175872 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 9
I0420 20:37:37.579243 135426393175872 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/9.
I0420 20:37:38.150811 135426393175872 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:37:38.150911 135426393175872 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 20:37:38.201493 135426393175872 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.051802s
I0420 20:37:38.201677 135426393175872 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.921 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.31348276138305664 s) (per-host)
I0420 20:37:38.201726 135426393175872 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.313561s (batch_requests_ready=0.259602s, total_serialization_initiated=0.053876s, others=0.000083s)
I0420 20:37:38.201816 135426393175872 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.317879s (all_items=0.000011s, per_item={'items': '0.00001144'}, temp_paths=0.317868)
I0420 20:37:38.202700 135305554290432 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:37:38.202858 135426393175872 async_checkpointer.py:561] Finished blocking save. Time taken: 0.626937s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/9.
I0420 20:37:38.222340 135426393175872 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:37:38.222569 135301225752320 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:37:38.222715 135426393175872 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776717408.5980444, 'wait_for_prev_duration_secs': 48.9761757850647, 'time_between_consecutive_saves_sec': 20.577677488327026, 'checkpointer_blocking_start_time': 1776717457.5758939, 'checkpointer_blocking_duration_secs': 0.6270713806152344, 'get_old_steps_start_time': 1776717458.2029793, 'get_old_steps_duration_secs': 2.0265579223632812e-05, 'checkpoint_manager_blocking_start_time': 1776717408.5962067, 'checkpoint_manager_blocking_duration_secs': 49.62647795677185}
I0420 20:37:38.222820 135426393175872 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0420 20:37:38.222861 135426393175872 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:37:43.137279 135305562683136 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_16_zarr3_true/checkpoints/9/items/array_metadatas/process_7
I0420 20:38:19.636641 135305554290432 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 37.836 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.74842357635498 s) (per-host)
I0420 20:38:19.636776 135305554290432 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.433964s.
I0420 20:38:27.605625 135305554290432 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 49.402797s.
I0420 20:38:27.605928 135301225752320 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:38:27.606050 135301225752320 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:38:27.606091 135301225752320 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:38:27.607745 135301225752320 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0420 20:38:27.607925 135426393175872 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.
I0420 20:38:27.608066 135426393175872 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 20:38:27.608776 135426393175872 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.147, Tokens/s/device: 13889.454, 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: Mon Apr 20 20:38:37 UTC 2026
EXIT_CODE=0