MaxView

XPK Start: Mon Apr 20 07:12:41 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 07:13:05.425208: 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 07:13:05.960439 137912096147264 max_utils.py:273] Attempting to initialize the jax distributed system...
I0420 07:13:15.002393 137912096147264 distributed.py:149] Starting JAX distributed service on [::]:8482
I0420 07:13:15.004789 137912096147264 distributed.py:172] Connecting to JAX distributed service on mt-15-ocdbt-false-rs-o5i2c-slice-job-0-0.mt-15-ocdbt-false-rs-o5i2c:8482
I0420 07:13:16.368739 137912096147264 max_utils.py:284] Jax distributed system initialized!
I0420 07:13:22.655984 137912096147264 max_utils.py:800] System Information: Jax Version: 0.9.2
I0420 07:13:22.656089 137912096147264 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0420 07:13:22.656128 137912096147264 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 07:13:22.656162 137912096147264 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 07:13:23.350818 137912096147264 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 07:13:23.351091 137912096147264 checkpointing.py:677] Setting up checkpoint logger...
I0420 07:13:23.351145 137912096147264 checkpointing.py:233] Creating checkpoint manager with ocdbt=False and zarr3=True
I0420 07:13:23.351188 137912096147264 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0420 07:13:23.351554 137912096147264 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=False, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7d6d9d3141a0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 07:13:24.596007 137912096147264 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0420 07:13:24.596238 137912096147264 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 0x7d58402f3770>}, handler_registry=None
I0420 07:13:24.596504 137912096147264 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d58402f3770>` 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 07:13:24.596557 137912096147264 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d5840452120>` 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 07:13:24.596596 137912096147264 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 0x7d58402f3770>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d58402f3770>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d5840452120>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d5840452120>}).
I0420 07:13:24.596916 137912096147264 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0420 07:13:24.596988 137912096147264 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d57fc617880> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0420 07:13:26.510511 137789773432576 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776669032372857120, 'commit_timestamp_nsecs': 1776669046354114586, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/0/_CHECKPOINT_METADATA
I0420 07:13:26.758313 137789781825280 checkpoint_manager.py:1871] Missing metrics for step 5
I0420 07:13:27.122997 137912096147264 checkpoint_manager.py:1812] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints
I0420 07:13:27.494912 137912096147264 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_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d58402f2f00>
I0420 07:13:27.495085 137912096147264 checkpointing.py:301] Checkpoint manager created!
I0420 07:13:28.412562 137912096147264 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 07:13:28.412679 137912096147264 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:13:28.792001 137912096147264 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:13:28.792090 137912096147264 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:13:28.808526 137912096147264 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:13:28.808589 137912096147264 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:13:28.833073 137912096147264 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 07:13:28.833139 137912096147264 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:13:28.849595 137912096147264 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 07:13:28.849655 137912096147264 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:13:28.865938 137912096147264 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 07:13:28.865996 137912096147264 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:13:28.896257 137912096147264 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 07:13:28.896366 137912096147264 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:13:28.917832 137912096147264 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 07:13:28.917894 137912096147264 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 07:13:29.133817 137912096147264 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 07:13:29.133920 137912096147264 checkpointing.py:581] restoring from this run's directory step 9
I0420 07:13:29.385881 137912096147264 event_tracking.py:70] [process=4] [sync] Started load checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/9.
I0420 07:13:29.636987 137912096147264 checkpointer.py:307] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/9.
I0420 07:13:29.637416 137912096147264 event_tracking.py:125] [process=4] [sync] Finished blocking load in 0.25 seconds. Continuing load @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/9.
I0420 07:13:32.366500    1495 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 07:13:41.594278 137912096147264 jax_array_handlers.py:843] [process=4] /jax/orbax/read/worker/io/requested throughput: 152.202 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.382753133773804 s) (per-host)
I0420 07:13:41.611308 137912096147264 base_pytree_checkpoint_handler.py:130] [process=4] /jax/checkpoint/read/gbytes_per_sec: 146.064 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.834927558898926 s) (per-host)
I0420 07:13:42.786175 137912096147264 event_tracking.py:138] [process=4] [sync] Finished load in 13.40 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/9
I0420 07:13:42.786326 137912096147264 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints', 'checkpointer_start_time': 1776669209.3857725, 'checkpointer_duration_secs': 13.400522470474243, 'checkpoint_manager_start_time': 1776669209.1341562, 'checkpoint_manager_duration_secs': 13.652140855789185}
fsdp: 32
I0420 07:13:43.204629 137912096147264 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0420 07:13:43.204761 137912096147264 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 07:13:43.204825 137912096147264 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 07:13:43.204953 137912096147264 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 07:13:43.205019 137912096147264 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 07:13:43.205066 137912096147264 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 07:13:43.205140 137912096147264 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 07:13:43.205198 137912096147264 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 07:13:43.205238 137912096147264 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 07:13:43.205276 137912096147264 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 07:13:43.205322 137912096147264 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0420 07:13:43.205384 137912096147264 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0420 07:13:43.688929 137912096147264 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:13:43.689021 137912096147264 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:13:43.704538 137912096147264 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:13:43.704594 137912096147264 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:13:54.935581 137912096147264 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 07:13:54.936494 137912096147264 metric_logger.py:301] number parameters: 1.104 billion
I0420 07:14:06.362269 137912096147264 checkpointing.py:772] Waiting for step 10 to finish before checkpoint...
I0420 07:14:06.515065 137912096147264 checkpointing.py:776] Waited 0.1527724266052246 seconds for step 10 to finish before starting checkpointing.
I0420 07:14:06.517972 137912096147264 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:14:06.519549 137912096147264 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 10
I0420 07:14:06.520965 137912096147264 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/10.
I0420 07:14:06.857804 137912096147264 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 07:14:06.858740 137912096147264 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:14:06.858806 137912096147264 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 07:14:07.133141 137912096147264 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.275414s
I0420 07:14:07.133314 137912096147264 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 5.519 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2795276641845703 s) (per-host)
I0420 07:14:07.133379 137912096147264 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.279604s (batch_requests_ready=0.002355s, total_serialization_initiated=0.277165s, others=0.000084s)
I0420 07:14:07.133474 137912096147264 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.283838s (all_items=0.000022s, per_item={'items': '0.00002193'}, temp_paths=0.283816)
I0420 07:14:07.134257 137912096147264 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_15_ocdbt_false/checkpoints/10.
I0420 07:14:07.134571 137786929682176 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:34:07.134525
I0420 07:14:07.145684 137912096147264 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:14:07.146007 137786308949760 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:14:07.146159 137912096147264 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669246.5179543, 'wait_for_prev_duration_secs': 6.103515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776669246.5195916, 'checkpointer_blocking_duration_secs': 0.6151297092437744, 'get_old_steps_start_time': 1776669247.1347458, 'get_old_steps_duration_secs': 3.1948089599609375e-05, 'checkpoint_manager_blocking_start_time': 1776669246.5155675, 'checkpoint_manager_blocking_duration_secs': 0.6305558681488037}
I0420 07:14:07.146268 137912096147264 checkpointing.py:408] Started an asynchronous checkpoint save for step 10
I0420 07:14:07.146319 137912096147264 max_utils.py:750] 
Memstats: After params initialized:
I0420 07:14:07.146385 137912096147264 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0))
I0420 07:14:07.146420 137912096147264 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0))
I0420 07:14:07.146447 137912096147264 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0))
I0420 07:14:07.146473 137912096147264 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0))
I0420 07:14:07.456778 137912096147264 metric_logger.py:196] completed step: 10, seconds: 11.426, TFLOP/s/device: 1.189, Tokens/s/device: 179.246, total_weights: 65536, loss: 6.833, lm_loss: 6.833, perplexity: 927.869
I0420 07:14:07.627836 137912096147264 metric_logger.py:196] completed step: 11, seconds: 1.093, TFLOP/s/device: 12.431, Tokens/s/device: 1873.811, total_weights: 65536, loss: 6.527, lm_loss: 6.527, perplexity: 683.659
I0420 07:14:07.775385 137912096147264 metric_logger.py:196] completed step: 12, seconds: 0.024, TFLOP/s/device: 577.439, Tokens/s/device: 87037.824, total_weights: 65536, loss: 6.265, lm_loss: 6.265, perplexity: 526.068
I0420 07:14:07.922723 137912096147264 metric_logger.py:196] completed step: 13, seconds: 0.154, TFLOP/s/device: 88.412, Tokens/s/device: 13326.393, total_weights: 65536, loss: 6.045, lm_loss: 6.045, perplexity: 422.001
I0420 07:14:07.927505 137912096147264 checkpointing.py:772] Waiting for step 15 to finish before checkpoint...
I0420 07:14:08.217010 137912096147264 checkpointing.py:776] Waited 0.28946828842163086 seconds for step 15 to finish before starting checkpointing.
I0420 07:14:08.220222 137912096147264 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:14:12.281544 137786392811264 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_15_ocdbt_false/checkpoints/10/items/array_metadatas/process_4
I0420 07:14:17.610084 137786929682176 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 146.854 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.756263017654419 s) (per-host)
I0420 07:14:17.610194 137786929682176 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.475514s.
I0420 07:14:22.994287 137786929682176 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 15.859588s.
I0420 07:14:22.994661 137786308949760 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:14:22.994775 137786308949760 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:14:22.994824 137786308949760 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:14:22.997181 137786308949760 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0420 07:14:22.997308 137912096147264 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0420 07:14:22.997386 137912096147264 checkpoint_manager.py:1452] Waiting for previous save to complete took 14.777172 seconds. If this number is high, consider checkpointing less frequently.
I0420 07:14:22.999552 137912096147264 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 15
I0420 07:14:23.002081 137912096147264 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/15.
I0420 07:14:23.295837 137912096147264 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:14:23.295936 137912096147264 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 07:14:23.336930 137912096147264 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042139s
I0420 07:14:23.337095 137912096147264 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 33.793 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04564714431762695 s) (per-host)
I0420 07:14:23.337143 137912096147264 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045705s (batch_requests_ready=0.001849s, total_serialization_initiated=0.043791s, others=0.000065s)
I0420 07:14:23.337229 137912096147264 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050584s (all_items=0.000029s, per_item={'items': '0.00002933'}, temp_paths=0.050555)
I0420 07:14:23.337964 137912096147264 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.34 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/15.
I0420 07:14:23.338260 137786308949760 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:34:23.338226
I0420 07:14:23.752180 137912096147264 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:14:23.752562 137782131414784 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:14:23.752743 137912096147264 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669248.2201936, 'wait_for_prev_duration_secs': 14.777171611785889, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776669262.9995904, 'checkpointer_blocking_duration_secs': 0.3387877941131592, 'get_old_steps_start_time': 1776669263.338403, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776669248.2176168, 'checkpoint_manager_blocking_duration_secs': 15.535088777542114}
I0420 07:14:23.752872 137912096147264 checkpointing.py:408] Started an asynchronous checkpoint save for step 15
I0420 07:14:23.754656 137912096147264 metric_logger.py:196] completed step: 14, seconds: 0.147, TFLOP/s/device: 92.241, Tokens/s/device: 13903.504, total_weights: 65536, loss: 5.864, lm_loss: 5.864, perplexity: 352.193
I0420 07:14:23.761005 137912096147264 metric_logger.py:196] completed step: 15, seconds: 0.148, TFLOP/s/device: 92.020, Tokens/s/device: 13870.264, total_weights: 65536, loss: 5.719, lm_loss: 5.719, perplexity: 304.661
I0420 07:14:28.486447 137786392811264 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_15_ocdbt_false/checkpoints/15/items/array_metadatas/process_4
I0420 07:14:33.502850 137786308949760 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 154.690 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.211363554000854 s) (per-host)
I0420 07:14:33.502969 137786308949760 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.164055s.
I0420 07:14:39.946513 137786308949760 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 16.607583s.
I0420 07:14:39.946799 137782131414784 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:14:39.946934 137782131414784 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:14:39.946999 137782131414784 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:14:39.948459 137782131414784 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0420 07:14:44.675718 137912096147264 metric_logger.py:196] completed step: 16, seconds: 15.832, TFLOP/s/device: 0.858, Tokens/s/device: 129.358, total_weights: 65536, loss: 5.605, lm_loss: 5.605, perplexity: 271.872
I0420 07:14:44.823311 137912096147264 metric_logger.py:196] completed step: 17, seconds: 20.768, TFLOP/s/device: 0.654, Tokens/s/device: 98.611, total_weights: 65536, loss: 5.517, lm_loss: 5.517, perplexity: 248.975
I0420 07:14:44.970898 137912096147264 metric_logger.py:196] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.110, Tokens/s/device: 13431.622, total_weights: 65536, loss: 5.448, lm_loss: 5.448, perplexity: 232.333
I0420 07:14:45.117680 137912096147264 checkpointing.py:772] Waiting for step 19 to finish before checkpoint...
I0420 07:14:45.118372 137912096147264 checkpointing.py:776] Waited 0.0007126331329345703 seconds for step 19 to finish before starting checkpointing.
I0420 07:14:45.120511 137912096147264 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:14:45.122262 137912096147264 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 19
I0420 07:14:45.123707 137912096147264 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/19.
I0420 07:14:45.435712 137912096147264 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:14:45.435806 137912096147264 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 07:14:45.477113 137912096147264 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042369s
I0420 07:14:45.477279 137912096147264 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 33.632 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04586672782897949 s) (per-host)
I0420 07:14:45.477329 137912096147264 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045927s (batch_requests_ready=0.001710s, total_serialization_initiated=0.044152s, others=0.000065s)
I0420 07:14:45.477440 137912096147264 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050033s (all_items=0.000011s, per_item={'items': '0.00001121'}, temp_paths=0.050022)
I0420 07:14:45.478147 137912096147264 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.36 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/19.
I0420 07:14:45.478854 137782131414784 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:34:45.478830
I0420 07:14:45.480868 137912096147264 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:14:45.481113 137786300557056 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:14:45.481264 137912096147264 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669285.1204789, 'wait_for_prev_duration_secs': 7.414817810058594e-05, 'time_between_consecutive_saves_sec': 5.171980381011963, 'checkpointer_blocking_start_time': 1776669285.1223, 'checkpointer_blocking_duration_secs': 0.3566701412200928, 'get_old_steps_start_time': 1776669285.4789896, 'get_old_steps_duration_secs': 2.8848648071289062e-05, 'checkpoint_manager_blocking_start_time': 1776669285.1185963, 'checkpoint_manager_blocking_duration_secs': 0.3626370429992676}
I0420 07:14:45.481393 137912096147264 checkpointing.py:408] Started an asynchronous checkpoint save for step 19
I0420 07:14:45.481441 137912096147264 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:14:50.574261 137786308949760 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_15_ocdbt_false/checkpoints/19/items/array_metadatas/process_4
I0420 07:14:55.660848 137782131414784 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 154.417 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.229405641555786 s) (per-host)
I0420 07:14:55.660965 137782131414784 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.182022s.
I0420 07:15:00.534375 137782131414784 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 15.055393s.
I0420 07:15:00.534669 137786300557056 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:15:00.534780 137786300557056 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:15:00.534820 137786300557056 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:15:00.536514 137786300557056 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0420 07:15:00.536681 137912096147264 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0420 07:15:00.536824 137912096147264 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:15:00.537755 137912096147264 metric_logger.py:196] completed step: 19, seconds: 0.147, TFLOP/s/device: 92.127, Tokens/s/device: 13886.346, 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: Mon Apr 20 07:15:12 UTC 2026
EXIT_CODE=0

XPK Start: Mon Apr 20 20:30:47 UTC 2026
2026-04-20 20:30:52.049572: 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 00:00:1776717052.062579      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776717052.066324      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776717052.077480      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776717052.077498      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776717052.077501      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776717052.077503      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-20 20:31:11.350600: 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 20:31:11.879014 135600879982400 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-20 20:31:20,921:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0420 20:31:20.921193 135600879982400 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-20 20:31:20,926:jax._src.distributed:157: Connecting to JAX distributed service on mt-15-ocdbt-false-rs-iem9b-slice-job-0-0.mt-15-ocdbt-false-rs-iem9b:8482
I0420 20:31:20.926748 135600879982400 distributed.py:157] Connecting to JAX distributed service on mt-15-ocdbt-false-rs-iem9b-slice-job-0-0.mt-15-ocdbt-false-rs-iem9b:8482
I0420 20:31:21.715362 135600879982400 max_utils.py:284] Jax distributed system initialized!
I0420 20:31:28.539010 135600879982400 max_utils.py:800] System Information: Jax Version: 0.8.1
I0420 20:31:28.539121 135600879982400 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0420 20:31:28.539161 135600879982400 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 20:31:28.539194 135600879982400 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 20:31:29.162685 135600879982400 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 20:31:29.163361 135600879982400 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 20:31:29.163552 135600879982400 checkpointing.py:688] Setting up checkpoint logger...
I0420 20:31:29.163604 135600879982400 checkpointing.py:234] Creating checkpoint manager with ocdbt=False and zarr3=True
I0420 20:31:29.163648 135600879982400 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0420 20:31:29.164051 135600879982400 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=False, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7b5381779070>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 20:31:30.496626 135600879982400 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0420 20:31:30.497020 135600879982400 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 0x7b3e50739e20>}, handler_registry=None
I0420 20:31:30.497274 135600879982400 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b3e50739e20>` 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 20:31:30.497324 135600879982400 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b3e5073ebd0>` 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 20:31:30.497360 135600879982400 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 0x7b3e50739e20>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b3e50739e20>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b3e5073ebd0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b3e5073ebd0>}).
I0420 20:31:30.497871 135600879982400 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0420 20:31:30.497951 135600879982400 async_checkpointer.py:177] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b3e50118180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0420 20:31:32.050150 135479752115968 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776716941162456810, 'commit_timestamp_nsecs': 1776716955664918988, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/5/_CHECKPOINT_METADATA
I0420 20:31:32.304293 135479752115968 checkpoint_manager.py:1877] Missing metrics for step 5
I0420 20:31:32.600377 135600879982400 checkpoint_manager.py:1818] Found 3 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_15_ocdbt_false/checkpoints
I0420 20:31:33.088554 135600879982400 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_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b3e5073ae10>
I0420 20:31:33.088746 135600879982400 checkpointing.py:302] Checkpoint manager created!
I0420 20:31:33.990484 135600879982400 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 20:31:33.990596 135600879982400 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:31:34.368803 135600879982400 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 20:31:34.368896 135600879982400 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:31:34.385041 135600879982400 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 20:31:34.385102 135600879982400 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:31:34.408025 135600879982400 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 20:31:34.408091 135600879982400 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:31:34.424203 135600879982400 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 20:31:34.424270 135600879982400 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:31:34.440237 135600879982400 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 20:31:34.440309 135600879982400 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:31:34.465355 135600879982400 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 20:31:34.465426 135600879982400 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:31:34.485369 135600879982400 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 20:31:34.485433 135600879982400 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 20:31:34.679206 135600879982400 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 20:31:34.679322 135600879982400 checkpointing.py:582] restoring from this run's directory step 9
I0420 20:31:35.191186 135600879982400 checkpointer.py:304] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/9.
I0420 20:31:37.821451    1461 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 20:31:47.660810 135600879982400 jax_array_handlers.py:837] [process=7] /jax/orbax/read/worker/io/requested throughput: 144.959 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.90151596069336 s) (per-host)
I0420 20:31:47.668045 135600879982400 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/read/gbytes_per_sec: 139.937 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.30931830406189 s) (per-host)
I0420 20:31:48.559782 135600879982400 checkpointer.py:318] Finished restoring checkpoint in 13.62 seconds from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/9.
I0420 20:31:48.559941 135600879982400 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints', 'checkpointer_start_time': 1776717094.935605, 'checkpointer_duration_secs': 13.624304294586182, 'checkpoint_manager_start_time': 1776717094.6795697, 'checkpoint_manager_duration_secs': 13.88034176826477}
fsdp: 32
I0420 20:31:48.973059 135600879982400 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0420 20:31:48.973201 135600879982400 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 20:31:48.973257 135600879982400 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 20:31:48.973322 135600879982400 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 20:31:48.973380 135600879982400 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 20:31:48.973421 135600879982400 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 20:31:48.973476 135600879982400 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 20:31:48.973530 135600879982400 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 20:31:48.973571 135600879982400 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 20:31:48.973609 135600879982400 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 20:31:48.973668 135600879982400 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0420 20:31:48.973721 135600879982400 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')
I0420 20:31:49.479837 135600879982400 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 20:31:49.479930 135600879982400 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 20:31:49.495057 135600879982400 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 20:31:49.495114 135600879982400 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 20:32:00.419601 135600879982400 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 20:32:00.420571 135600879982400 metric_logger.py:289] number parameters: 1.104 billion
I0420 20:32:11.564018 135600879982400 checkpointing.py:794] Waiting for step 10 to finish before checkpoint...
I0420 20:32:11.719047 135600879982400 checkpointing.py:798] Waited 0.15502357482910156 seconds for step 10 to finish before starting checkpointing.
I0420 20:32:11.721451 135600879982400 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 20:32:11.722919 135600879982400 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 10
I0420 20:32:11.725731 135600879982400 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_15_ocdbt_false/checkpoints/10.
I0420 20:32:12.293042 135600879982400 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 20:32:12.294240 135600879982400 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:32:12.294312 135600879982400 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 20:32:12.547865 135600879982400 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.254920s
I0420 20:32:12.548040 135600879982400 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.023 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5102007389068604 s) (per-host)
I0420 20:32:12.548098 135600879982400 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.510273s (batch_requests_ready=0.253235s, total_serialization_initiated=0.256958s, others=0.000079s)
I0420 20:32:12.548190 135600879982400 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.514893s (all_items=0.000020s, per_item={'items': '0.00002003'}, temp_paths=0.514873)
I0420 20:32:12.549154 135477629810432 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:32:12.549350 135600879982400 async_checkpointer.py:561] Finished blocking save. Time taken: 0.826362s. 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_15_ocdbt_false/checkpoints/10.
I0420 20:32:12.558722 135600879982400 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:32:12.558968 135475968841472 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:32:12.559095 135600879982400 standard_logger.py:34] {'step': 10, '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_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776717131.7214334, 'wait_for_prev_duration_secs': 6.413459777832031e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776717131.722956, 'checkpointer_blocking_duration_secs': 0.8265011310577393, 'get_old_steps_start_time': 1776717132.5494745, 'get_old_steps_duration_secs': 2.765655517578125e-05, 'checkpoint_manager_blocking_start_time': 1776717131.719602, 'checkpoint_manager_blocking_duration_secs': 0.8394598960876465}
I0420 20:32:12.559198 135600879982400 checkpointing.py:409] Started an asynchronous checkpoint save for step 10
I0420 20:32:12.559251 135600879982400 max_utils.py:750] 
Memstats: After params initialized:
I0420 20:32:12.559300 135600879982400 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0420 20:32:12.559333 135600879982400 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0420 20:32:12.559361 135600879982400 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0420 20:32:12.559386 135600879982400 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0420 20:32:12.825741 135600879982400 metric_logger.py:185] completed step: 10, seconds: 11.143, TFLOP/s/device: 1.219, Tokens/s/device: 183.787, total_weights: 65536, loss: 6.833
I0420 20:32:12.988730 135600879982400 metric_logger.py:185] completed step: 11, seconds: 1.260, TFLOP/s/device: 10.780, Tokens/s/device: 1624.853, total_weights: 65536, loss: 6.528
I0420 20:32:13.136331 135600879982400 metric_logger.py:185] completed step: 12, seconds: 0.016, TFLOP/s/device: 848.665, Tokens/s/device: 127920.050, total_weights: 65536, loss: 6.265
I0420 20:32:13.283792 135600879982400 metric_logger.py:185] completed step: 13, seconds: 0.153, TFLOP/s/device: 88.825, Tokens/s/device: 13388.684, total_weights: 65536, loss: 6.045
I0420 20:32:13.288300 135600879982400 checkpointing.py:794] Waiting for step 15 to finish before checkpoint...
I0420 20:32:13.578540 135600879982400 checkpointing.py:798] Waited 0.290205717086792 seconds for step 15 to finish before starting checkpointing.
I0420 20:32:13.581378 135600879982400 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:32:17.146179 135475985626880 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_15_ocdbt_false/checkpoints/10/items/array_metadatas/process_7
I0420 20:32:23.074531 135477629810432 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 143.123 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.036662578582764 s) (per-host)
I0420 20:32:23.074645 135477629810432 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.525352s.
I0420 20:32:28.855391 135477629810432 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 16.306077s.
I0420 20:32:28.855614 135475968841472 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:32:28.855700 135475968841472 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:32:28.855759 135475968841472 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:32:28.857377 135475968841472 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0420 20:32:28.857577 135600879982400 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0420 20:32:28.857720 135600879982400 checkpoint_manager.py:1458] Waiting for previous save to complete took 15.276347 seconds. If this number is high, consider checkpointing less frequently.
I0420 20:32:28.859816 135600879982400 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 15
I0420 20:32:28.864021 135600879982400 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_15_ocdbt_false/checkpoints/15.
I0420 20:32:29.392486 135600879982400 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:32:29.392588 135600879982400 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 20:32:29.442468 135600879982400 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.051332s
I0420 20:32:29.442636 135600879982400 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.253 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29364824295043945 s) (per-host)
I0420 20:32:29.442702 135600879982400 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.293724s (batch_requests_ready=0.240365s, total_serialization_initiated=0.053275s, others=0.000083s)
I0420 20:32:29.442792 135600879982400 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.298725s (all_items=0.000013s, per_item={'items': '0.00001287'}, temp_paths=0.298712)
I0420 20:32:29.443666 135477621417728 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:32:29.443815 135600879982400 async_checkpointer.py:561] Finished blocking save. Time taken: 0.583933s. 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_15_ocdbt_false/checkpoints/15.
I0420 20:32:29.757281 135600879982400 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:32:29.757648 135475968841472 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:32:29.757828 135600879982400 standard_logger.py:34] {'step': 15, '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_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776717133.5813494, 'wait_for_prev_duration_secs': 15.276346921920776, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776717148.859854, 'checkpointer_blocking_duration_secs': 0.5840659141540527, 'get_old_steps_start_time': 1776717149.4439425, 'get_old_steps_duration_secs': 2.765655517578125e-05, 'checkpoint_manager_blocking_start_time': 1776717133.5791621, 'checkpoint_manager_blocking_duration_secs': 16.178627490997314}
I0420 20:32:29.757938 135600879982400 checkpointing.py:409] Started an asynchronous checkpoint save for step 15
I0420 20:32:29.758527 135600879982400 metric_logger.py:185] completed step: 14, seconds: 0.148, TFLOP/s/device: 92.087, Tokens/s/device: 13880.417, total_weights: 65536, loss: 5.864
I0420 20:32:29.764976 135600879982400 metric_logger.py:185] completed step: 15, seconds: 0.147, TFLOP/s/device: 92.280, Tokens/s/device: 13909.453, total_weights: 65536, loss: 5.719
I0420 20:32:47.896481 135600879982400 metric_logger.py:185] completed step: 16, seconds: 16.475, TFLOP/s/device: 0.825, Tokens/s/device: 124.307, total_weights: 65536, loss: 5.605
I0420 20:32:48.043962 135600879982400 metric_logger.py:185] completed step: 17, seconds: 17.986, TFLOP/s/device: 0.755, Tokens/s/device: 113.868, total_weights: 65536, loss: 5.517
I0420 20:32:48.191437 135600879982400 metric_logger.py:185] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.256, Tokens/s/device: 13453.681, total_weights: 65536, loss: 5.448
I0420 20:32:48.338558 135600879982400 checkpointing.py:794] Waiting for step 19 to finish before checkpoint...
I0420 20:32:48.339241 135600879982400 checkpointing.py:798] Waited 0.0007045269012451172 seconds for step 19 to finish before starting checkpointing.
I0420 20:32:48.341290 135600879982400 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:32:51.382459 135475985626880 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_15_ocdbt_false/checkpoints/15/items/array_metadatas/process_7
I0420 20:32:58.038062 135477621417728 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 54.678 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 28.889031648635864 s) (per-host)
I0420 20:32:58.038179 135477621417728 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 28.594409s.
I0420 20:33:02.826723 135477621417728 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 33.382938s.
I0420 20:33:02.826994 135475968841472 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:33:02.827111 135475968841472 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:33:02.827157 135475968841472 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:33:02.828677 135475968841472 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0420 20:33:02.828834 135600879982400 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15.
W0420 20:33:02.828951 135600879982400 checkpoint_manager.py:1458] Waiting for previous save to complete took 14.487681 seconds. If this number is high, consider checkpointing less frequently.
I0420 20:33:02.830380 135600879982400 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 19
I0420 20:33:02.833858 135600879982400 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_15_ocdbt_false/checkpoints/19.
I0420 20:33:03.368439 135600879982400 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:33:03.368534 135600879982400 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 20:33:03.419458 135600879982400 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.051930s
I0420 20:33:03.419620 135600879982400 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.979 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.30980634689331055 s) (per-host)
I0420 20:33:03.419680 135600879982400 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.309875s (batch_requests_ready=0.255718s, total_serialization_initiated=0.054083s, others=0.000074s)
I0420 20:33:03.419771 135600879982400 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.313833s (all_items=0.000011s, per_item={'items': '0.00001073'}, temp_paths=0.313822)
I0420 20:33:03.420669 135472252708608 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:33:03.420829 135600879982400 async_checkpointer.py:561] Finished blocking save. Time taken: 0.590379s. 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_15_ocdbt_false/checkpoints/19.
I0420 20:33:03.694607 135600879982400 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:33:03.695047 135475968841472 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:33:03.695195 135600879982400 standard_logger.py:34] {'step': 19, '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_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776717168.3412542, 'wait_for_prev_duration_secs': 14.487680912017822, 'time_between_consecutive_saves_sec': 19.48381233215332, 'checkpointer_blocking_start_time': 1776717182.8304198, 'checkpointer_blocking_duration_secs': 0.5905191898345947, 'get_old_steps_start_time': 1776717183.420953, 'get_old_steps_duration_secs': 2.8133392333984375e-05, 'checkpoint_manager_blocking_start_time': 1776717168.3394804, 'checkpoint_manager_blocking_duration_secs': 15.355684041976929}
I0420 20:33:03.695363 135600879982400 checkpointing.py:409] Started an asynchronous checkpoint save for step 19
I0420 20:33:03.695408 135600879982400 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:33:08.320090 135475985626880 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_15_ocdbt_false/checkpoints/19/items/array_metadatas/process_7
I0420 20:33:14.303567 135472252708608 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 141.115 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.193722486495972 s) (per-host)
I0420 20:33:14.303702 135472252708608 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.882921s.
I0420 20:33:18.816802 135472252708608 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 15.396008s.
I0420 20:33:18.817065 135475968841472 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:33:18.817192 135475968841472 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:33:18.817234 135475968841472 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:33:18.818633 135475968841472 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0420 20:33:18.818818 135600879982400 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0420 20:33:18.818959 135600879982400 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 20:33:18.819593 135600879982400 metric_logger.py:185] completed step: 19, seconds: 0.147, TFLOP/s/device: 92.223, Tokens/s/device: 13900.861, 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: Mon Apr 20 20:33:28 UTC 2026
EXIT_CODE=0