MaxView

XPK Start: Sat Apr 18 19:55:54 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-18 19:56:18.585836: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303)
I0418 19:56:19.115494 134226523375424 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 19:56:28.157152 134226523375424 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 19:56:28.159672 134226523375424 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-false-rs-jkbfq-slice-job-0-0.mt-16-zarr3-false-rs-jkbfq:8482
I0418 19:56:29.891535 134226523375424 max_utils.py:284] Jax distributed system initialized!
I0418 19:56:36.038491 134226523375424 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 19:56:36.038592 134226523375424 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 19:56:36.038631 134226523375424 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365
I0418 19:56:36.038663 134226523375424 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 19:56:36.720108 134226523375424 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 19:56:36.720384 134226523375424 checkpointing.py:677] Setting up checkpoint logger...
I0418 19:56:36.720438 134226523375424 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=False
I0418 19:56:36.720481 134226523375424 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 19:56:36.720825 134226523375424 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 0x7a136e519070>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 19:56:38.301365 134226523375424 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 19:56:38.301596 134226523375424 checkpoint_manager.py:708] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79ff281966f0>}, handler_registry=None
I0418 19:56:38.301845 134226523375424 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79ff281966f0>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`.
I0418 19:56:38.301893 134226523375424 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79ff28198b60>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`.
I0418 19:56:38.301928 134226523375424 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 0x79ff281966f0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79ff281966f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79ff28198b60>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79ff28198b60>}).
I0418 19:56:38.302253 134226523375424 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 19:56:38.302323 134226523375424 async_checkpointer.py:192] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x79fef84db880> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 19:56:41.615752 134103978473216 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776542030492889275, 'commit_timestamp_nsecs': 1776542077797214067, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/9/_CHECKPOINT_METADATA
I0418 19:56:41.864759 134103978473216 checkpoint_manager.py:1871] Missing metrics for step 9
I0418 19:56:42.708612 134226523375424 checkpoint_manager.py:1812] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints
I0418 19:56:43.106492 134226523375424 checkpoint_manager.py:929] [process=0][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=5), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x79ff28375880>
I0418 19:56:43.106657 134226523375424 checkpointing.py:301] Checkpoint manager created!
I0418 19:56:44.011914 134226523375424 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 19:56:44.012024 134226523375424 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 19:56:44.391348 134226523375424 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 19:56:44.391495 134226523375424 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 19:56:44.407781 134226523375424 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 19:56:44.407863 134226523375424 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 19:56:44.431795 134226523375424 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 19:56:44.431871 134226523375424 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 19:56:44.448015 134226523375424 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 19:56:44.448076 134226523375424 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 19:56:44.464211 134226523375424 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 19:56:44.464271 134226523375424 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 19:56:44.488595 134226523375424 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 19:56:44.488664 134226523375424 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 19:56:44.509698 134226523375424 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 19:56:44.509761 134226523375424 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 19:56:44.724377 134226523375424 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 19:56:44.724479 134226523375424 checkpointing.py:581] restoring from this run's directory step 9
I0418 19:56:45.325993 134226523375424 event_tracking.py:70] [process=0] [sync] Started load checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/9.
I0418 19:56:45.572578 134226523375424 checkpointer.py:307] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/9.
I0418 19:56:45.573018 134226523375424 event_tracking.py:125] [process=0] [sync] Finished blocking load in 0.25 seconds. Continuing load @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/9.
I0418 19:56:47.000221    1463 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 19:56:53.658679 134226523375424 jax_array_handlers.py:843] [process=0] /jax/orbax/read/worker/io/requested throughput: 237.127 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 6.6642420291900635 s) (per-host)
I0418 19:56:53.663620 134226523375424 base_pytree_checkpoint_handler.py:130] [process=0] /jax/checkpoint/read/gbytes_per_sec: 223.152 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 7.091994047164917 s) (per-host)
I0418 19:56:56.141288 134226523375424 event_tracking.py:138] [process=0] [sync] Finished load in 10.82 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/9
I0418 19:56:56.141445 134226523375424 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints', 'checkpointer_start_time': 1776542205.3258939, 'checkpointer_duration_secs': 10.815519571304321, 'checkpoint_manager_start_time': 1776542204.7247267, 'checkpoint_manager_duration_secs': 11.416688919067383}
fsdp: 32
I0418 19:56:56.551715 134226523375424 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0418 19:56:56.551851 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0418 19:56:56.551905 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0418 19:56:56.551961 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0418 19:56:56.552013 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0418 19:56:56.552050 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0418 19:56:56.552100 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/key/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0418 19:56:56.552155 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/out/kernel
    Shape:     float32[16,16,128,2048]
    Logical:   P('heads', 'layers', 'kv', 'embed')
    Physical:  (None, None, None, 'fsdp')
I0418 19:56:56.552196 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/query/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'q_heads', 'kv')
    Physical:  ('fsdp', None, None, None)
I0418 19:56:56.552232 134226523375424 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/value/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0418 19:56:56.552277 134226523375424 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0418 19:56:56.552324 134226523375424 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0418 19:56:57.040140 134226523375424 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 19:56:57.040234 134226523375424 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 19:56:57.055527 134226523375424 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 19:56:57.055586 134226523375424 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 19:57:08.054440 134226523375424 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0418 19:57:08.062511 134226523375424 metric_logger.py:301] number parameters: 1.104 billion
I0418 19:57:19.559443 134226523375424 checkpointing.py:772] Waiting for step 10 to finish before checkpoint...
I0418 19:57:19.715522 134226523375424 checkpointing.py:776] Waited 0.15605616569519043 seconds for step 10 to finish before starting checkpointing.
I0418 19:57:19.718290 134226523375424 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 19:57:19.720352 134226523375424 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 10
I0418 19:57:19.722018 134226523375424 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10.
I0418 19:57:20.465840 134226523375424 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 19:57:20.478746 134226523375424 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 19:57:20.478824 134226523375424 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0418 19:57:20.738430 134102850189056 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10
I0418 19:57:20.753794 134226523375424 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.275773s
I0418 19:57:20.754633 134226523375424 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 5.495 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28072667121887207 s) (per-host)
I0418 19:57:20.754710 134226523375424 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.280828s (batch_requests_ready=0.002150s, total_serialization_initiated=0.277927s, others=0.000752s)
I0418 19:57:20.754788 134226523375424 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.284862s (all_items=0.000018s, per_item={'items': '0.00001812'}, temp_paths=0.284843)
I0418 19:57:20.755528 134226523375424 event_tracking.py:125] [process=0] [async] Finished blocking save in 1.04 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10.
I0418 19:57:20.755888 134103944902400 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 20:17:20.755850
I0418 19:57:20.764258 134226523375424 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 19:57:20.764524 134098592978688 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0418 19:57:20.764672 134226523375424 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776542239.718272, 'wait_for_prev_duration_secs': 6.365776062011719e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776542239.7203898, 'checkpointer_blocking_duration_secs': 1.0356519222259521, 'get_old_steps_start_time': 1776542240.7560658, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776542239.716053, 'checkpoint_manager_blocking_duration_secs': 1.048583984375}
I0418 19:57:20.764771 134226523375424 checkpointing.py:408] Started an asynchronous checkpoint save for step 10
I0418 19:57:20.764832 134226523375424 max_utils.py:750] 
Memstats: After params initialized:
I0418 19:57:20.764881 134226523375424 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_0(process=0,(0,0,0,0))
I0418 19:57:20.764915 134226523375424 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_1(process=0,(1,0,0,0))
I0418 19:57:20.764942 134226523375424 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_4(process=0,(0,1,0,0))
I0418 19:57:20.764966 134226523375424 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_5(process=0,(1,1,0,0))
I0418 19:57:21.116702 134226523375424 metric_logger.py:196] completed step: 10, seconds: 11.182, TFLOP/s/device: 1.215, Tokens/s/device: 183.153, total_weights: 65536, loss: 6.833, lm_loss: 6.833, perplexity: 927.869
I0418 19:57:21.261960 134226523375424 metric_logger.py:196] completed step: 11, seconds: 1.555, TFLOP/s/device: 8.736, Tokens/s/device: 1316.719, total_weights: 65536, loss: 6.527, lm_loss: 6.527, perplexity: 683.659
I0418 19:57:21.409368 134226523375424 metric_logger.py:196] completed step: 12, seconds: 0.011, TFLOP/s/device: 1260.519, Tokens/s/device: 189999.072, total_weights: 65536, loss: 6.265, lm_loss: 6.265, perplexity: 526.068
I0418 19:57:21.556746 134226523375424 metric_logger.py:196] completed step: 13, seconds: 0.146, TFLOP/s/device: 93.276, Tokens/s/device: 14059.561, total_weights: 65536, loss: 6.045, lm_loss: 6.045, perplexity: 422.001
I0418 19:57:21.565860 134226523375424 checkpointing.py:772] Waiting for step 15 to finish before checkpoint...
I0418 19:57:21.850849 134226523375424 checkpointing.py:776] Waited 0.28478002548217773 seconds for step 15 to finish before starting checkpointing.
I0418 19:57:21.854637 134226523375424 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 19:57:22.957235 134100180653824 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10/items
I0418 19:57:23.074592 134098584585984 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776542242682333868, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776542242682333868, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10/_CHECKPOINT_METADATA
I0418 19:57:26.623372 134098609764096 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10/items/array_metadatas/process_0
I0418 19:58:06.058773 134098601371392 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.595345s (commit=40.378070s, array_metadata_write=1.217275s)
I0418 19:58:06.060342 134103944902400 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 34.651 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 45.58639669418335 s) (per-host)
I0418 19:58:06.060513 134103944902400 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 45.304507s.
I0418 19:58:08.377839 134103944902400 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000400s.
I0418 19:58:08.529413 134098584585984 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776542242682333868, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10/_CHECKPOINT_METADATA
I0418 19:58:09.283387 134103944902400 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.934017s. use_zarr3=False, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10/items
I0418 19:58:09.285452 134103944902400 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10/items
I0418 19:58:10.242336 134103944902400 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10
I0418 19:58:12.061011 134103944902400 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10`.
I0418 19:58:12.062125 134103944902400 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 52.34 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/10
I0418 19:58:12.063731 134103944902400 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 51.307721s.
I0418 19:58:12.064057 134098592978688 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 19:58:12.064234 134098592978688 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0418 19:58:12.064345 134098592978688 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0418 19:58:12.065942 134098592978688 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0418 19:58:12.066217 134226523375424 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0418 19:58:12.066344 134226523375424 checkpoint_manager.py:1452] Waiting for previous save to complete took 50.211715 seconds. If this number is high, consider checkpointing less frequently.
I0418 19:58:12.068187 134226523375424 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 15
I0418 19:58:12.070496 134226523375424 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15.
I0418 19:58:12.797055 134226523375424 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 19:58:12.797197 134226523375424 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0418 19:58:12.826432 134226523375424 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.030430s
I0418 19:58:12.827342 134226523375424 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 39.641 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03891348838806152 s) (per-host)
I0418 19:58:12.827439 134226523375424 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.039033s (batch_requests_ready=0.004020s, total_serialization_initiated=0.034179s, others=0.000833s)
I0418 19:58:12.827556 134226523375424 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.043999s (all_items=0.000023s, per_item={'items': '0.00002265'}, temp_paths=0.043977)
I0418 19:58:12.828488 134226523375424 event_tracking.py:125] [process=0] [async] Finished blocking save in 0.76 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15.
I0418 19:58:12.828870 134098592978688 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 20:18:12.828833
I0418 19:58:12.831358 134226523375424 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 19:58:12.831667 134098609764096 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0418 19:58:12.831858 134226523375424 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776542241.8545923, 'wait_for_prev_duration_secs': 50.21171522140503, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776542292.0682523, 'checkpointer_blocking_duration_secs': 0.7607996463775635, 'get_old_steps_start_time': 1776542292.829082, 'get_old_steps_duration_secs': 5.030632019042969e-05, 'checkpoint_manager_blocking_start_time': 1776542241.8515317, 'checkpoint_manager_blocking_duration_secs': 50.980263471603394}
I0418 19:58:12.832008 134226523375424 checkpointing.py:408] Started an asynchronous checkpoint save for step 15
I0418 19:58:13.025667 134103944902400 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15
I0418 19:58:16.069210 134100203591424 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15/items
I0418 19:58:19.752691 134100180653824 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15/items/array_metadatas/process_0
I0418 19:58:34.201574 134226523375424 metric_logger.py:196] completed step: 14, seconds: 0.147, TFLOP/s/device: 92.343, Tokens/s/device: 13918.906, total_weights: 65536, loss: 5.864, lm_loss: 5.864, perplexity: 352.193
I0418 19:58:34.210745 134226523375424 metric_logger.py:196] completed step: 15, seconds: 0.147, TFLOP/s/device: 92.238, Tokens/s/device: 13903.126, total_weights: 65536, loss: 5.719, lm_loss: 5.719, perplexity: 304.661
I0418 19:58:34.356463 134226523375424 metric_logger.py:196] completed step: 16, seconds: 72.643, TFLOP/s/device: 0.187, Tokens/s/device: 28.193, total_weights: 65536, loss: 5.605, lm_loss: 5.605, perplexity: 271.872
I0418 19:58:34.504003 134226523375424 metric_logger.py:196] completed step: 17, seconds: 0.007, TFLOP/s/device: 1898.174, Tokens/s/device: 286113.440, total_weights: 65536, loss: 5.517, lm_loss: 5.517, perplexity: 248.975
I0418 19:58:34.651571 134226523375424 metric_logger.py:196] completed step: 18, seconds: 0.147, TFLOP/s/device: 92.597, Tokens/s/device: 13957.229, total_weights: 65536, loss: 5.448, lm_loss: 5.448, perplexity: 232.333
I0418 19:58:34.798094 134226523375424 checkpointing.py:772] Waiting for step 19 to finish before checkpoint...
I0418 19:58:34.798763 134226523375424 checkpointing.py:776] Waited 0.0006899833679199219 seconds for step 19 to finish before starting checkpointing.
I0418 19:58:34.800886 134226523375424 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 19:58:59.051157 134100172261120 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.872876s (commit=40.242225s, array_metadata_write=1.630651s)
I0418 19:58:59.052181 134098592978688 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 34.143 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 46.26373052597046 s) (per-host)
I0418 19:58:59.052311 134098592978688 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 46.223294s.
I0418 19:59:01.276639 134098592978688 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000226s.
I0418 19:59:01.903919 134098592978688 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.929476s. use_zarr3=False, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15/items
I0418 19:59:01.905708 134098592978688 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15/items
I0418 19:59:02.496953 134098592978688 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15
I0418 19:59:03.896874 134098592978688 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15`.
I0418 19:59:03.897704 134098592978688 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 51.83 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/15
I0418 19:59:03.899243 134098592978688 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 51.070223s.
I0418 19:59:03.899484 134098609764096 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 19:59:03.899611 134098609764096 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0418 19:59:03.899678 134098609764096 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0418 19:59:03.901486 134098609764096 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0418 19:59:03.901650 134226523375424 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15.
W0418 19:59:03.901776 134226523375424 checkpoint_manager.py:1452] Waiting for previous save to complete took 29.100894 seconds. If this number is high, consider checkpointing less frequently.
I0418 19:59:03.903314 134226523375424 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 19
I0418 19:59:03.905287 134226523375424 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19.
I0418 19:59:05.033886 134226523375424 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 19:59:05.033980 134226523375424 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0418 19:59:05.059832 134226523375424 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.026871s
I0418 19:59:05.060689 134226523375424 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 49.244 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03132486343383789 s) (per-host)
I0418 19:59:05.060763 134226523375424 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.031419s (batch_requests_ready=0.001786s, total_serialization_initiated=0.028862s, others=0.000771s)
I0418 19:59:05.060857 134226523375424 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.035501s (all_items=0.000016s, per_item={'items': '0.00001621'}, temp_paths=0.035485)
I0418 19:59:05.061496 134226523375424 event_tracking.py:125] [process=0] [async] Finished blocking save in 1.16 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19.
I0418 19:59:05.061822 134100203591424 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 20:19:05.061765
I0418 19:59:05.063438 134226523375424 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 19:59:05.063709 134098609764096 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0418 19:59:05.063878 134226523375424 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776542314.8008523, 'wait_for_prev_duration_secs': 29.10089421272278, 'time_between_consecutive_saves_sec': 22.734842777252197, 'checkpointer_blocking_start_time': 1776542343.903355, 'checkpointer_blocking_duration_secs': 1.158611536026001, 'get_old_steps_start_time': 1776542345.0619817, 'get_old_steps_duration_secs': 2.765655517578125e-05, 'checkpoint_manager_blocking_start_time': 1776542314.7990124, 'checkpoint_manager_blocking_duration_secs': 30.2648344039917}
I0418 19:59:05.063986 134226523375424 checkpointing.py:408] Started an asynchronous checkpoint save for step 19
I0418 19:59:05.064027 134226523375424 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 19:59:05.265986 134098592978688 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19
I0418 19:59:07.426480 134102850189056 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19/items
I0418 19:59:10.665931 134103936509696 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19/items/array_metadatas/process_0
I0418 19:59:50.521384 134102367860480 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.999682s (commit=40.405861s, array_metadata_write=1.593821s)
I0418 19:59:50.522416 134100203591424 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 34.722 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 45.493045806884766 s) (per-host)
I0418 19:59:50.522498 134100203591424 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 45.460559s.
I0418 19:59:52.790468 134100203591424 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000225s.
I0418 19:59:53.955210 134100203591424 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 2.151744s. use_zarr3=False, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19/items
I0418 19:59:53.956887 134100203591424 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19/items
I0418 19:59:54.473652 134100203591424 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19
I0418 19:59:55.877516 134100203591424 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19`.
I0418 19:59:55.878356 134100203591424 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 51.97 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_16_zarr3_false/checkpoints/19
I0418 19:59:55.879791 134100203591424 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 50.817832s.
I0418 19:59:55.880036 134098609764096 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 19:59:55.880116 134098609764096 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0418 19:59:55.880174 134098609764096 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0418 19:59:55.882199 134098609764096 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0418 19:59:55.882384 134226523375424 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0418 19:59:55.882535 134226523375424 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 19:59:55.883387 134226523375424 metric_logger.py:196] completed step: 19, seconds: 0.148, TFLOP/s/device: 91.999, Tokens/s/device: 13867.071, total_weights: 65536, loss: 5.391, lm_loss: 5.391, perplexity: 219.349
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 18 20:00:09 UTC 2026
EXIT_CODE=0

XPK Start: Sun Apr 19 04:53:02 UTC 2026
2026-04-19 04:53:06.437941: 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 00:00:1776574386.450831      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776574386.454512      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776574386.466036      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776574386.466057      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776574386.466059      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776574386.466061      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-19 04:53:25.572824: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303)
I0419 04:53:26.102316 135447319566144 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-19 04:53:35,143:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0419 04:53:35.143900 135447319566144 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-19 04:53:35,146:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-false-rs-z7006-slice-job-0-0.mt-16-zarr3-false-rs-z7006:8482
I0419 04:53:35.146147 135447319566144 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-false-rs-z7006-slice-job-0-0.mt-16-zarr3-false-rs-z7006:8482
I0419 04:53:36.710688 135447319566144 max_utils.py:284] Jax distributed system initialized!
I0419 04:53:43.557512 135447319566144 max_utils.py:800] System Information: Jax Version: 0.8.1
I0419 04:53:43.557622 135447319566144 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0419 04:53:43.557673 135447319566144 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709
I0419 04:53:43.557720 135447319566144 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0419 04:53:44.171194 135447319566144 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0419 04:53:44.171856 135447319566144 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0419 04:53:44.172047 135447319566144 checkpointing.py:688] Setting up checkpoint logger...
I0419 04:53:44.172102 135447319566144 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=False
I0419 04:53:44.172150 135447319566144 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0419 04:53:44.172500 135447319566144 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 0x7b2fc77786e0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0419 04:53:45.544154 135447319566144 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0419 04:53:45.544502 135447319566144 checkpoint_manager.py:709] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b1b8063db20>}, handler_registry=None
I0419 04:53:45.544739 135447319566144 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b1b8063db20>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`.
I0419 04:53:45.544788 135447319566144 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b1b8025fef0>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`.
I0419 04:53:45.544839 135447319566144 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 0x7b1b8063db20>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b1b8063db20>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b1b8025fef0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b1b8025fef0>}).
I0419 04:53:45.545373 135447319566144 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0419 04:53:45.545453 135447319566144 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b1b80408180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0419 04:53:49.119044 135326232213248 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776574259581887249, 'commit_timestamp_nsecs': 1776574307530321616, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/9/_CHECKPOINT_METADATA
I0419 04:53:49.368428 135326232213248 checkpoint_manager.py:1877] Missing metrics for step 9
I0419 04:53:50.211412 135447319566144 checkpoint_manager.py:1818] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints
I0419 04:53:51.097779 135447319566144 checkpoint_manager.py:929] [process=0][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_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_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b1b80210170>
I0419 04:53:51.097985 135447319566144 checkpointing.py:302] Checkpoint manager created!
I0419 04:53:51.972929 135447319566144 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0419 04:53:51.973040 135447319566144 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 04:53:52.344734 135447319566144 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 04:53:52.344838 135447319566144 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 04:53:52.360440 135447319566144 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 04:53:52.360499 135447319566144 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 04:53:52.383297 135447319566144 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 04:53:52.383367 135447319566144 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 04:53:52.399189 135447319566144 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 04:53:52.399252 135447319566144 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 04:53:52.414888 135447319566144 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 04:53:52.414948 135447319566144 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 04:53:52.439777 135447319566144 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0419 04:53:52.439861 135447319566144 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 04:53:52.459348 135447319566144 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0419 04:53:52.459420 135447319566144 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0419 04:53:52.651638 135447319566144 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0419 04:53:52.651750 135447319566144 checkpointing.py:582] restoring from this run's directory step 9
I0419 04:53:53.567038 135447319566144 checkpointer.py:304] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/9.
I0419 04:53:56.071594    1426 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0419 04:54:02.700982 135447319566144 jax_array_handlers.py:837] [process=0] /jax/orbax/read/worker/io/requested throughput: 238.188 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 6.63456392288208 s) (per-host)
I0419 04:54:02.716767 135447319566144 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/read/gbytes_per_sec: 224.273 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 7.056540012359619 s) (per-host)
I0419 04:54:04.188863 135447319566144 checkpointer.py:318] Finished restoring checkpoint in 11.29 seconds from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/9.
I0419 04:54:04.189046 135447319566144 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints', 'checkpointer_start_time': 1776574432.8942454, 'checkpointer_duration_secs': 11.294768571853638, 'checkpoint_manager_start_time': 1776574432.6520088, 'checkpoint_manager_duration_secs': 11.537007808685303}
fsdp: 32
I0419 04:54:04.593873 135447319566144 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0419 04:54:04.594006 135447319566144 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)
I0419 04:54:04.594061 135447319566144 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)
I0419 04:54:04.594129 135447319566144 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')
I0419 04:54:04.594192 135447319566144 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)
I0419 04:54:04.594234 135447319566144 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)
I0419 04:54:04.594290 135447319566144 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)
I0419 04:54:04.594344 135447319566144 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')
I0419 04:54:04.594387 135447319566144 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)
I0419 04:54:04.594426 135447319566144 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)
I0419 04:54:04.594473 135447319566144 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)

I0419 04:54:04.594519 135447319566144 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')
I0419 04:54:05.108603 135447319566144 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 04:54:05.108695 135447319566144 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 04:54:05.123724 135447319566144 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 04:54:05.123783 135447319566144 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 04:54:15.903426 135447319566144 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0419 04:54:15.909597 135447319566144 metric_logger.py:289] number parameters: 1.104 billion
I0419 04:54:27.395862 135447319566144 checkpointing.py:794] Waiting for step 10 to finish before checkpoint...
I0419 04:54:27.548498 135447319566144 checkpointing.py:798] Waited 0.15261554718017578 seconds for step 10 to finish before starting checkpointing.
I0419 04:54:27.550914 135447319566144 checkpoint_manager.py:2013] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 04:54:27.552589 135447319566144 checkpoint_manager.py:1518] [process=0] Saving checkpoint at step 10
I0419 04:54:27.555335 135447319566144 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10.
I0419 04:54:28.711905 135447319566144 signaling_client.py:364] Using JaxDistributedSignalingClient
I0419 04:54:29.004106 135447319566144 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0419 04:54:29.004212 135447319566144 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0419 04:54:29.251313 135447319566144 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.248254s
I0419 04:54:29.252229 135447319566144 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.899 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5321474075317383 s) (per-host)
I0419 04:54:29.252301 135447319566144 base_pytree_checkpoint_handler.py:737] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.532239s (batch_requests_ready=0.280574s, total_serialization_initiated=0.250827s, others=0.000838s)
I0419 04:54:29.252379 135447319566144 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.536381s (all_items=0.000019s, per_item={'items': '0.00001884'}, temp_paths=0.536363)
I0419 04:54:29.253254 135323505895168 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0419 04:54:29.253412 135447319566144 async_checkpointer.py:561] Finished blocking save. Time taken: 1.700753s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10.
I0419 04:54:29.396281 135321912067840 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10
I0419 04:54:29.667338 135447319566144 checkpoint_manager.py:1566] [process=0][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 04:54:29.667719 135321391208192 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0419 04:54:29.667862 135447319566144 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776574467.5508964, 'wait_for_prev_duration_secs': 6.198883056640625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776574467.5526268, 'checkpointer_blocking_duration_secs': 1.7008919715881348, 'get_old_steps_start_time': 1776574469.2535384, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776574467.5490813, 'checkpoint_manager_blocking_duration_secs': 2.1187429428100586}
I0419 04:54:29.668025 135447319566144 checkpointing.py:409] Started an asynchronous checkpoint save for step 10
I0419 04:54:29.668080 135447319566144 max_utils.py:750] 
Memstats: After params initialized:
I0419 04:54:29.668147 135447319566144 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_0(process=0,(0,0,0,0))
I0419 04:54:29.668183 135447319566144 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_1(process=0,(1,0,0,0))
I0419 04:54:29.668210 135447319566144 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_4(process=0,(0,1,0,0))
I0419 04:54:29.668236 135447319566144 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_5(process=0,(1,1,0,0))
I0419 04:54:29.960444 135447319566144 metric_logger.py:185] completed step: 10, seconds: 11.127, TFLOP/s/device: 1.221, Tokens/s/device: 184.065, total_weights: 65536, loss: 6.833
I0419 04:54:30.105937 135447319566144 metric_logger.py:185] completed step: 11, seconds: 2.563, TFLOP/s/device: 5.301, Tokens/s/device: 799.058, total_weights: 65536, loss: 6.528
I0419 04:54:30.253611 135447319566144 metric_logger.py:185] completed step: 12, seconds: 0.010, TFLOP/s/device: 1417.393, Tokens/s/device: 213644.899, total_weights: 65536, loss: 6.265
I0419 04:54:30.401142 135447319566144 metric_logger.py:185] completed step: 13, seconds: 0.147, TFLOP/s/device: 92.636, Tokens/s/device: 13963.033, total_weights: 65536, loss: 6.045
I0419 04:54:30.409988 135447319566144 checkpointing.py:794] Waiting for step 15 to finish before checkpoint...
I0419 04:54:30.695963 135447319566144 checkpointing.py:798] Waited 0.28584909439086914 seconds for step 15 to finish before starting checkpointing.
I0419 04:54:30.698974 135447319566144 checkpoint_manager.py:2024] [process=0][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 04:54:32.318711 135326190249728 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10/items
I0419 04:54:32.462023 135323364161280 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776574471629153570, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776574471629153570, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10/_CHECKPOINT_METADATA
I0419 04:54:35.485001 135325108115200 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10/items/array_metadatas/process_0
I0419 04:55:14.904704 135323514287872 base_pytree_checkpoint_handler.py:1232] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.061270s (commit=39.534473s, array_metadata_write=1.526798s)
I0419 04:55:14.906211 135323505895168 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/gbytes_per_sec: 34.201 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 46.18609023094177 s) (per-host)
I0419 04:55:14.906375 135323505895168 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 45.653007s.
I0419 04:55:16.397689 135323364161280 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776574471629153570, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10/_CHECKPOINT_METADATA
I0419 04:55:17.221562 135323505895168 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000383s.
I0419 04:55:18.569352 135323505895168 base_pytree_checkpoint_handler.py:1356] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 2.757968s. use_zarr3=False, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10/items
I0419 04:55:18.571669 135323505895168 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10/items
I0419 04:55:18.983858 135323505895168 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10
I0419 04:55:20.652923 135323505895168 atomicity.py:790] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10`.
I0419 04:55:20.654011 135323505895168 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 53.101352s. directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/10
I0419 04:55:20.655441 135323505895168 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 51.402071s.
I0419 04:55:20.655636 135321391208192 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 04:55:20.655739 135321391208192 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0419 04:55:20.655872 135321391208192 checkpoint_manager.py:2133] [process=0][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0419 04:55:20.657459 135321391208192 checkpoint_manager.py:2142] [process=0][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0419 04:55:20.657711 135447319566144 checkpoint_manager.py:2036] [process=0][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0419 04:55:20.657898 135447319566144 checkpoint_manager.py:1458] Waiting for previous save to complete took 49.958933 seconds. If this number is high, consider checkpointing less frequently.
I0419 04:55:20.659743 135447319566144 checkpoint_manager.py:1518] [process=0] Saving checkpoint at step 15
I0419 04:55:20.663851 135447319566144 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15.
I0419 04:55:22.066863 135447319566144 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0419 04:55:22.067001 135447319566144 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0419 04:55:22.115146 135447319566144 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.049669s
I0419 04:55:22.118703 135447319566144 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.108 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.30199766159057617 s) (per-host)
I0419 04:55:22.118836 135447319566144 base_pytree_checkpoint_handler.py:737] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.302162s (batch_requests_ready=0.244888s, total_serialization_initiated=0.053812s, others=0.003462s)
I0419 04:55:22.118982 135447319566144 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.306830s (all_items=0.000023s, per_item={'items': '0.00002265'}, temp_paths=0.306808)
I0419 04:55:22.120301 135321391208192 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0419 04:55:22.120519 135447319566144 async_checkpointer.py:561] Finished blocking save. Time taken: 1.460657s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15.
I0419 04:55:22.486863 135323505895168 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15
I0419 04:55:22.556488 135447319566144 checkpoint_manager.py:1566] [process=0][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 04:55:22.556989 135323514287872 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0419 04:55:22.557241 135447319566144 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776574470.6989303, 'wait_for_prev_duration_secs': 49.95893335342407, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776574520.6598213, 'checkpointer_blocking_duration_secs': 1.4608535766601562, 'get_old_steps_start_time': 1776574522.1207001, 'get_old_steps_duration_secs': 3.838539123535156e-05, 'checkpoint_manager_blocking_start_time': 1776574470.6965902, 'checkpoint_manager_blocking_duration_secs': 51.86059594154358}
I0419 04:55:22.557388 135447319566144 checkpointing.py:409] Started an asynchronous checkpoint save for step 15
I0419 04:55:41.117401 135447319566144 metric_logger.py:185] completed step: 14, seconds: 0.147, TFLOP/s/device: 92.192, Tokens/s/device: 13896.145, total_weights: 65536, loss: 5.864
I0419 04:55:41.126085 135447319566144 metric_logger.py:185] completed step: 15, seconds: 0.147, TFLOP/s/device: 92.205, Tokens/s/device: 13898.126, total_weights: 65536, loss: 5.719
I0419 04:55:41.272126 135447319566144 metric_logger.py:185] completed step: 16, seconds: 70.715, TFLOP/s/device: 0.192, Tokens/s/device: 28.961, total_weights: 65536, loss: 5.605
I0419 04:55:41.419377 135447319566144 metric_logger.py:185] completed step: 17, seconds: 0.007, TFLOP/s/device: 2001.050, Tokens/s/device: 301620.029, total_weights: 65536, loss: 5.517
I0419 04:55:41.567186 135447319566144 metric_logger.py:185] completed step: 18, seconds: 0.147, TFLOP/s/device: 92.378, Tokens/s/device: 13924.206, total_weights: 65536, loss: 5.448
I0419 04:55:41.714165 135447319566144 checkpointing.py:794] Waiting for step 19 to finish before checkpoint...
I0419 04:55:41.714827 135447319566144 checkpointing.py:798] Waited 0.0006654262542724609 seconds for step 19 to finish before starting checkpointing.
I0419 04:55:41.716761 135447319566144 checkpoint_manager.py:2024] [process=0][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 04:55:42.709317 135323355768576 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15/items
I0419 04:55:45.933741 135325116507904 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15/items/array_metadatas/process_0
I0419 04:56:27.088756 135325108115200 base_pytree_checkpoint_handler.py:1232] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 42.829082s (commit=40.880412s, array_metadata_write=1.948670s)
I0419 04:56:27.089787 135321391208192 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/gbytes_per_sec: 24.200 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 65.27309799194336 s) (per-host)
I0419 04:56:27.089884 135321391208192 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 64.969425s.
I0419 04:56:29.357005 135321391208192 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000273s.
I0419 04:56:29.767999 135321391208192 base_pytree_checkpoint_handler.py:1356] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.443830s. use_zarr3=False, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15/items
I0419 04:56:29.770105 135321391208192 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15/items
I0419 04:56:31.070652 135321391208192 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15
I0419 04:56:32.833545 135321391208192 atomicity.py:790] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15`.
I0419 04:56:32.834217 135321391208192 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 72.174379s. directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/15
I0419 04:56:32.835583 135321391208192 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 70.715118s.
I0419 04:56:32.835777 135323514287872 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 04:56:32.835926 135323514287872 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0419 04:56:32.835994 135323514287872 checkpoint_manager.py:2133] [process=0][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0419 04:56:32.837947 135323514287872 checkpoint_manager.py:2142] [process=0][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0419 04:56:32.838156 135447319566144 checkpoint_manager.py:2036] [process=0][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15.
W0419 04:56:32.838290 135447319566144 checkpoint_manager.py:1458] Waiting for previous save to complete took 51.121542 seconds. If this number is high, consider checkpointing less frequently.
I0419 04:56:32.839710 135447319566144 checkpoint_manager.py:1518] [process=0] Saving checkpoint at step 19
I0419 04:56:32.843227 135447319566144 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19.
I0419 04:56:33.787292 135321391208192 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19
I0419 04:56:33.788024 135447319566144 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0419 04:56:33.788134 135447319566144 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0419 04:56:33.813848 135447319566144 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027274s
I0419 04:56:33.814675 135447319566144 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.712 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2700634002685547 s) (per-host)
I0419 04:56:33.814742 135447319566144 base_pytree_checkpoint_handler.py:737] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.270149s (batch_requests_ready=0.239954s, total_serialization_initiated=0.029437s, others=0.000757s)
I0419 04:56:33.814840 135447319566144 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.274046s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.274029)
I0419 04:56:33.815671 135323505895168 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0419 04:56:33.815829 135447319566144 async_checkpointer.py:561] Finished blocking save. Time taken: 0.976033s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19.
I0419 04:56:34.700878 135447319566144 checkpoint_manager.py:1566] [process=0][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 04:56:34.701250 135323514287872 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0419 04:56:34.701423 135447319566144 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776574541.7167313, 'wait_for_prev_duration_secs': 51.12154173851013, 'time_between_consecutive_saves_sec': 21.059204816818237, 'checkpointer_blocking_start_time': 1776574592.8397481, 'checkpointer_blocking_duration_secs': 0.9761910438537598, 'get_old_steps_start_time': 1776574593.8159544, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776574541.7150533, 'checkpoint_manager_blocking_duration_secs': 52.986334562301636}
I0419 04:56:34.701536 135447319566144 checkpointing.py:409] Started an asynchronous checkpoint save for step 19
I0419 04:56:34.701579 135447319566144 checkpoint_manager.py:2024] [process=0][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 04:56:35.507341 135325116507904 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19/items
I0419 04:56:38.894909 135325108115200 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19/items/array_metadatas/process_0
I0419 04:57:17.432846 135324596422400 base_pytree_checkpoint_handler.py:1232] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 40.837664s (commit=39.271892s, array_metadata_write=1.565772s)
I0419 04:57:17.433934 135323505895168 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/gbytes_per_sec: 35.990 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.88929200172424 s) (per-host)
I0419 04:57:17.434046 135323505895168 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.618277s.
I0419 04:57:19.362459 135323505895168 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000214s.
I0419 04:57:19.820883 135323505895168 base_pytree_checkpoint_handler.py:1356] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.478898s. use_zarr3=False, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19/items
I0419 04:57:19.827317 135323505895168 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19/items
I0419 04:57:20.247862 135323505895168 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19
I0419 04:57:21.932525 135323505895168 atomicity.py:790] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19`.
I0419 04:57:21.933235 135323505895168 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 49.093474s. directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/linen_xpk_feat_nnx_set_defaults_true_20260419_025828_16_zarr3_false/checkpoints/19
I0419 04:57:21.934546 135323505895168 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 48.118776s.
I0419 04:57:21.934741 135323514287872 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 04:57:21.934881 135323514287872 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0419 04:57:21.934935 135323514287872 checkpoint_manager.py:2133] [process=0][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0419 04:57:21.936587 135323514287872 checkpoint_manager.py:2142] [process=0][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0419 04:57:21.936749 135447319566144 checkpoint_manager.py:2036] [process=0][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0419 04:57:21.936901 135447319566144 checkpoint_manager.py:2013] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 04:57:21.937517 135447319566144 metric_logger.py:185] completed step: 19, seconds: 0.147, TFLOP/s/device: 92.242, Tokens/s/device: 13903.692, total_weights: 65536, loss: 5.391
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sun Apr 19 04:57:33 UTC 2026
EXIT_CODE=0