XPK Start: Sat Apr 18 13:13:53 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-18 13:14:17.618394: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303)
I0418 13:14:18.147588 132419947870016 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 13:14:27.189361 132419947870016 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 13:14:27.191735 132419947870016 distributed.py:172] Connecting to JAX distributed service on mt-06-grad-accum-85451-slice-job-0-0.mt-06-grad-accum-85451:8482
I0418 13:14:28.819131 132419947870016 max_utils.py:284] Jax distributed system initialized!
I0418 13:14:34.769072 132419947870016 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 13:14:34.769177 132419947870016 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 13:14:34.769215 132419947870016 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365
I0418 13:14:34.769248 132419947870016 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 13:14:35.461945 132419947870016 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 13:14:35.462228 132419947870016 checkpointing.py:677] Setting up checkpoint logger...
I0418 13:14:35.462283 132419947870016 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0418 13:14:35.462327 132419947870016 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 13:14:35.462679 132419947870016 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x786eb44531a0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 13:14:38.820304 132419947870016 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 13:14:38.820533 132419947870016 checkpoint_manager.py:708] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786da8d7a630>}, handler_registry=None
I0418 13:14:38.820782 132419947870016 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786da8d7a630>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`.
I0418 13:14:38.820832 132419947870016 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x785b2065f680>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`.
I0418 13:14:38.820868 132419947870016 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 0x786da8d7a630>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786da8d7a630>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x785b2065f680>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x785b2065f680>}).
I0418 13:14:38.821185 132419947870016 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 13:14:38.821261 132419947870016 async_checkpointer.py:192] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x785b1023bc40> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 13:14:40.710151 132419947870016 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints
I0418 13:14:40.712418 132419947870016 checkpoint_manager.py:929] [process=3][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=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x785b2065f530>
I0418 13:14:40.712532 132419947870016 checkpointing.py:301] Checkpoint manager created!
I0418 13:14:42.447057 132419947870016 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 13:14:42.447170 132419947870016 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 13:14:42.827394 132419947870016 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 13:14:42.827487 132419947870016 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 13:14:42.844258 132419947870016 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 13:14:42.844323 132419947870016 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 13:14:42.867992 132419947870016 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 13:14:42.868062 132419947870016 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 13:14:42.884541 132419947870016 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 13:14:42.884600 132419947870016 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 13:14:42.900949 132419947870016 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 13:14:42.901009 132419947870016 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 13:14:42.926448 132419947870016 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 13:14:42.926518 132419947870016 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 13:14:42.947645 132419947870016 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 13:14:42.947706 132419947870016 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 13:14:43.175525 132419947870016 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 13:14:43.175647 132419947870016 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 13:14:44.621435 132419947870016 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0418 13:14:44.621566 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wi_0/kernel
Shape: float32[2048,16,7168]
Logical: P('embed', 'layers', 'mlp')
Physical: ('fsdp', None, None)
I0418 13:14:44.621630 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wi_1/kernel
Shape: float32[2048,16,7168]
Logical: P('embed', 'layers', 'mlp')
Physical: ('fsdp', None, None)
I0418 13:14:44.621690 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wo/kernel
Shape: float32[7168,16,2048]
Logical: P('mlp', 'layers', 'embed')
Physical: (None, None, 'fsdp')
I0418 13:14:44.621745 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/post_self_attention_layer_norm/scale
Shape: float32[2048,16]
Logical: P('norm', 'layers')
Physical: (None, None)
I0418 13:14:44.621783 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/pre_self_attention_layer_norm/scale
Shape: float32[2048,16]
Logical: P('norm', 'layers')
Physical: (None, None)
I0418 13:14:44.621835 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/self_attention/key/kernel
Shape: float32[2048,16,16,128]
Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim')
Physical: ('fsdp', None, None, None)
I0418 13:14:44.621889 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/self_attention/out/kernel
Shape: float32[16,16,128,2048]
Logical: P('heads', 'layers', 'kv', 'embed')
Physical: (None, None, None, 'fsdp')
I0418 13:14:44.621929 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/self_attention/query/kernel
Shape: float32[2048,16,16,128]
Logical: P('embed', 'layers', 'q_heads', 'kv')
Physical: ('fsdp', None, None, None)
I0418 13:14:44.621968 132419947870016 maxtext_utils.py:1654] params/params/decoder/layers/self_attention/value/kernel
Shape: float32[2048,16,16,128]
Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim')
Physical: ('fsdp', None, None, None)
I0418 13:14:44.622017 132419947870016 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0418 13:14:44.622065 132419947870016 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0418 13:14:44.644969 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048]............................................... Unknown.
I0418 13:14:44.645034 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048]............................................... (None,).
I0418 13:14:44.659803 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048,16,7168]....................................... Unknown.
I0418 13:14:44.659862 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048,16,7168]....................................... ('fsdp', None, None).
I0418 13:14:44.689364 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[7168,16,2048]....................................... Unknown.
I0418 13:14:44.689431 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[7168,16,2048]....................................... (None, None, 'fsdp').
I0418 13:14:44.704181 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048,16]............................................ Unknown.
I0418 13:14:44.704235 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048,16]............................................ (None, None).
I0418 13:14:44.733789 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048,16,16,128]..................................... Unknown.
I0418 13:14:44.733852 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048,16,16,128]..................................... ('fsdp', None, None, None).
I0418 13:14:44.748604 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[16,16,128,2048]..................................... Unknown.
I0418 13:14:44.748672 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[16,16,128,2048]..................................... (None, None, None, 'fsdp').
I0418 13:14:44.792798 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048,32000]......................................... Unknown.
I0418 13:14:44.792873 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048,32000]......................................... ('fsdp', None).
I0418 13:14:44.807605 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[32000,2048]......................................... Unknown.
I0418 13:14:44.807673 132419947870016 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[32000,2048]......................................... (None, 'fsdp').
I0418 13:14:45.490671 132419947870016 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 13:14:45.490763 132419947870016 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 13:14:45.506375 132419947870016 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 13:14:45.506437 132419947870016 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 13:14:56.631513 132419947870016 max_utils.py:791] Total memory size: 1.7 GB, Output size: 0.4 GB, Temp size: 1.3 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0418 13:14:56.632353 132419947870016 metric_logger.py:301] number parameters: 1.104 billion
I0418 13:14:58.525694 132419947870016 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 13:15:09.562199 132419947870016 checkpointing.py:776] Waited 11.036482334136963 seconds for step 0 to finish before starting checkpointing.
I0418 13:15:09.564651 132419947870016 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 13:15:09.566836 132419947870016 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 0
I0418 13:15:09.568248 132419947870016 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints/0.
I0418 13:15:10.692547 132419947870016 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 13:15:10.693581 132419947870016 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 13:15:10.693649 132419947870016 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0418 13:15:10.965195 132419947870016 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.272721s
I0418 13:15:10.965368 132419947870016 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 5.549 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2780158519744873 s) (per-host)
I0418 13:15:10.965419 132419947870016 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.278076s (batch_requests_ready=0.002180s, total_serialization_initiated=0.275826s, others=0.000070s)
I0418 13:15:10.965507 132419947870016 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.282338s (all_items=0.000018s, per_item={'items': '0.00001836'}, temp_paths=0.282319)
I0418 13:15:10.966338 132419947870016 event_tracking.py:125] [process=3] [async] Finished blocking save in 1.40 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints/0.
I0418 13:15:10.966607 132295718684416 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 13:35:10.966584
I0418 13:15:10.973878 132419947870016 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 13:15:10.974146 132294599182080 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0418 13:15:10.974308 132419947870016 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776518109.5646331, 'wait_for_prev_duration_secs': 5.793571472167969e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776518109.5668764, 'checkpointer_blocking_duration_secs': 1.399848461151123, 'get_old_steps_start_time': 1776518110.9667506, 'get_old_steps_duration_secs': 3.075599670410156e-05, 'checkpoint_manager_blocking_start_time': 1776518109.5627356, 'checkpoint_manager_blocking_duration_secs': 1.4115331172943115}
I0418 13:15:10.974417 132419947870016 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 13:15:10.974466 132419947870016 max_utils.py:750]
Memstats: After params initialized:
I0418 13:15:10.974515 132419947870016 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0))
I0418 13:15:10.974547 132419947870016 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0))
I0418 13:15:10.974574 132419947870016 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0))
I0418 13:15:10.974599 132419947870016 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0))
I0418 13:15:11.286111 132419947870016 metric_logger.py:196] completed step: 0, seconds: 1.893, TFLOP/s/device: 28.707, Tokens/s/device: 4326.997, total_weights: 262144, loss: 10.877, lm_loss: 10.877, perplexity: 52959.059
I0418 13:15:11.891492 132419947870016 metric_logger.py:196] completed step: 1, seconds: 12.759, TFLOP/s/device: 4.260, Tokens/s/device: 642.062, total_weights: 262144, loss: 10.877, lm_loss: 10.877, perplexity: 52959.059
I0418 13:15:12.469836 132419947870016 metric_logger.py:196] completed step: 2, seconds: 0.027, TFLOP/s/device: 2011.790, Tokens/s/device: 303238.941, total_weights: 262144, loss: 10.563, lm_loss: 10.563, perplexity: 38662.707
I0418 13:15:13.048364 132419947870016 metric_logger.py:196] completed step: 3, seconds: 0.585, TFLOP/s/device: 92.907, Tokens/s/device: 14003.945, total_weights: 262144, loss: 10.272, lm_loss: 10.272, perplexity: 28909.668
I0418 13:15:14.205363 132419947870016 metric_logger.py:196] completed step: 4, seconds: 0.578, TFLOP/s/device: 94.037, Tokens/s/device: 14174.261, total_weights: 262144, loss: 10.022, lm_loss: 10.022, perplexity: 22524.992
I0418 13:15:14.211542 132419947870016 metric_logger.py:196] completed step: 5, seconds: 0.578, TFLOP/s/device: 93.948, Tokens/s/device: 14160.907, total_weights: 262144, loss: 9.820, lm_loss: 9.820, perplexity: 18401.865
I0418 13:15:15.339390 2533 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 13:15:18.366194 132294607574784 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints/0/items/array_metadatas/process_3
I0418 13:15:49.387960 132295718684416 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 40.816 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 38.70058751106262 s) (per-host)
I0418 13:15:49.388068 132295718684416 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 38.421373s.
I0418 13:16:00.697399 132295718684416 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 49.730687s.
I0418 13:16:00.697752 132294599182080 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 13:16:00.697874 132294599182080 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0418 13:16:00.697926 132294599182080 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 13:16:00.699437 132294599182080 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 13:16:00.929659 132419947870016 metric_logger.py:196] completed step: 6, seconds: 1.157, TFLOP/s/device: 46.955, Tokens/s/device: 7077.505, total_weights: 262144, loss: 9.667, lm_loss: 9.667, perplexity: 15787.604
I0418 13:16:01.508071 132419947870016 metric_logger.py:196] completed step: 7, seconds: 46.140, TFLOP/s/device: 1.178, Tokens/s/device: 177.547, total_weights: 262144, loss: 9.561, lm_loss: 9.561, perplexity: 14203.827
I0418 13:16:02.086694 132419947870016 metric_logger.py:196] completed step: 8, seconds: 0.584, TFLOP/s/device: 93.104, Tokens/s/device: 14033.597, total_weights: 262144, loss: 9.496, lm_loss: 9.496, perplexity: 13302.920
I0418 13:16:02.664527 132419947870016 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0418 13:16:02.665204 132419947870016 checkpointing.py:776] Waited 0.000698089599609375 seconds for step 9 to finish before starting checkpointing.
I0418 13:16:02.667548 132419947870016 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 13:16:02.669255 132419947870016 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 9
I0418 13:16:02.671030 132419947870016 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints/9.
I0418 13:16:03.377084 132419947870016 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 13:16:03.377177 132419947870016 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0418 13:16:03.412579 132419947870016 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036503s
I0418 13:16:03.412764 132419947870016 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 38.641 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03992104530334473 s) (per-host)
I0418 13:16:03.412815 132419947870016 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.039983s (batch_requests_ready=0.001624s, total_serialization_initiated=0.038291s, others=0.000069s)
I0418 13:16:03.412904 132419947870016 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.044022s (all_items=0.000016s, per_item={'items': '0.00001574'}, temp_paths=0.044007)
I0418 13:16:03.413661 132419947870016 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.74 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints/9.
I0418 13:16:03.413952 132295184869120 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 13:36:03.413920
I0418 13:16:03.416866 132419947870016 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 13:16:03.417142 132294599182080 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0418 13:16:03.417302 132419947870016 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776518162.6675167, 'wait_for_prev_duration_secs': 7.152557373046875e-05, 'time_between_consecutive_saves_sec': 1.9680399894714355, 'checkpointer_blocking_start_time': 1776518162.6693394, 'checkpointer_blocking_duration_secs': 0.7447159290313721, 'get_old_steps_start_time': 1776518163.4140778, 'get_old_steps_duration_secs': 2.9325485229492188e-05, 'checkpoint_manager_blocking_start_time': 1776518162.6654391, 'checkpoint_manager_blocking_duration_secs': 0.751828670501709}
I0418 13:16:03.417405 132419947870016 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0418 13:16:03.417448 132419947870016 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 13:16:09.797721 132289262503680 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_06_grad_accum/checkpoints/9/items/array_metadatas/process_3
I0418 13:16:45.408158 132295184869120 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 37.578 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.035285234451294 s) (per-host)
I0418 13:16:45.408271 132295184869120 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.993712s.
I0418 13:16:54.691079 132295184869120 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 51.276504s.
I0418 13:16:54.691499 132294599182080 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 13:16:54.691637 132294599182080 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0418 13:16:54.691699 132294599182080 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0418 13:16:54.693412 132294599182080 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0418 13:16:54.693589 132419947870016 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0418 13:16:54.693744 132419947870016 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 13:16:54.694763 132419947870016 metric_logger.py:196] completed step: 9, seconds: 0.579, TFLOP/s/device: 93.902, Tokens/s/device: 14153.934, total_weights: 262144, loss: 9.457, lm_loss: 9.457, perplexity: 12802.546
Per train step:
Total TFLOPs: 54.35
split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 18 13:17:03 UTC 2026
EXIT_CODE=0