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