XPK Start: Sat Apr 18 14:36:04 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 14:36:28.019868: 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 14:36:28.553606 138548147648320 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 14:36:37.599564 138548147648320 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 14:36:37.601931 138548147648320 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-false-sv-n7nkg-slice-job-0-0.mt-16-zarr3-false-sv-n7nkg:8482
I0418 14:36:38.512213 138548147648320 max_utils.py:284] Jax distributed system initialized!
I0418 14:36:43.715630 138548147648320 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 14:36:43.715730 138548147648320 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 14:36:43.715770 138548147648320 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 14:36:43.715807 138548147648320 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 14:36:44.418376 138548147648320 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 14:36:44.418666 138548147648320 checkpointing.py:677] Setting up checkpoint logger...
I0418 14:36:44.418720 138548147648320 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=False
I0418 14:36:44.418763 138548147648320 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 14:36:44.419099 138548147648320 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=False, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7e01a3515a00>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 14:36:47.827909 138548147648320 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 14:36:47.828139 138548147648320 checkpoint_manager.py:708] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e007879d970>}, handler_registry=None
I0418 14:36:47.828374 138548147648320 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e007879d970>` 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 14:36:47.828421 138548147648320 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dee0829acc0>` 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 14:36:47.828485 138548147648320 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 0x7e007879d970>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e007879d970>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dee0829acc0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dee0829acc0>}).
I0418 14:36:47.828828 138548147648320 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 14:36:47.828898 138548147648320 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7dedf05b7c40> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 14:36:50.199126 138548147648320 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints
I0418 14:36:50.647555 138548147648320 checkpoint_manager.py:929] [process=5][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=5), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7dee0846f530>
I0418 14:36:50.647739 138548147648320 checkpointing.py:301] Checkpoint manager created!
I0418 14:36:51.567610 138548147648320 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 14:36:51.567730 138548147648320 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 14:36:51.943547 138548147648320 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 14:36:51.943634 138548147648320 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 14:36:51.959864 138548147648320 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 14:36:51.959923 138548147648320 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 14:36:51.983936 138548147648320 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 14:36:51.984003 138548147648320 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 14:36:52.000092 138548147648320 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 14:36:52.000149 138548147648320 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 14:36:52.016109 138548147648320 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 14:36:52.016165 138548147648320 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 14:36:52.040296 138548147648320 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 14:36:52.040364 138548147648320 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 14:36:52.061307 138548147648320 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 14:36:52.061370 138548147648320 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 14:36:52.274660 138548147648320 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 14:36:52.274763 138548147648320 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 14:36:53.692093 138548147648320 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0418 14:36:53.692228 138548147648320 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 14:36:53.692281 138548147648320 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 14:36:53.692338 138548147648320 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 14:36:53.692388 138548147648320 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 14:36:53.692425 138548147648320 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 14:36:53.692490 138548147648320 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 14:36:53.692543 138548147648320 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 14:36:53.692583 138548147648320 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 14:36:53.692620 138548147648320 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 14:36:53.692667 138548147648320 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0418 14:36:53.692719 138548147648320 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0418 14:36:54.194104 138548147648320 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 14:36:54.194197 138548147648320 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 14:36:54.209436 138548147648320 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 14:36:54.209508 138548147648320 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 14:37:05.211437 138548147648320 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0418 14:37:05.212216 138548147648320 metric_logger.py:301] number parameters: 1.104 billion
I0418 14:37:16.243835 138548147648320 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 14:37:16.446070 138548147648320 checkpointing.py:776] Waited 0.20221352577209473 seconds for step 0 to finish before starting checkpointing.
I0418 14:37:16.448371 138548147648320 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 14:37:16.450275 138548147648320 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0
I0418 14:37:16.452103 138548147648320 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/0.
I0418 14:37:17.638072 138548147648320 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 14:37:17.639175 138548147648320 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 14:37:17.639232 138548147648320 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 14:37:17.915747 138548147648320 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.277743s
I0418 14:37:17.915926 138548147648320 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.447 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28319239616394043 s) (per-host)
I0418 14:37:17.915991 138548147648320 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.283263s (batch_requests_ready=0.002309s, total_serialization_initiated=0.280874s, others=0.000080s)
I0418 14:37:17.916116 138548147648320 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.287428s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.287410)
I0418 14:37:17.916953 138548147648320 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.47 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/0.
I0418 14:37:17.917288 138422418593536 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 14:57:17.917249
I0418 14:37:17.925413 138548147648320 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 14:37:17.925705 138421330765568 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 14:37:17.925868 138548147648320 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776523036.448347, 'wait_for_prev_duration_secs': 8.702278137207031e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776523036.4503622, 'checkpointer_blocking_duration_secs': 1.4670777320861816, 'get_old_steps_start_time': 1776523037.9174726, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776523036.4465861, 'checkpoint_manager_blocking_duration_secs': 1.4792437553405762}
I0418 14:37:17.925971 138548147648320 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 14:37:17.926020 138548147648320 max_utils.py:750]
Memstats: After params initialized:
I0418 14:37:17.926069 138548147648320 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0))
I0418 14:37:17.926102 138548147648320 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0418 14:37:17.926129 138548147648320 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0418 14:37:17.926156 138548147648320 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0418 14:37:18.239987 138548147648320 metric_logger.py:196] completed step: 0, seconds: 11.032, TFLOP/s/device: 1.232, Tokens/s/device: 185.650, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 14:37:18.414425 138548147648320 metric_logger.py:196] completed step: 1, seconds: 1.995, TFLOP/s/device: 6.812, Tokens/s/device: 1026.742, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 14:37:18.833136 138548147648320 metric_logger.py:196] completed step: 2, seconds: 0.027, TFLOP/s/device: 499.435, Tokens/s/device: 75280.279, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38547.719
I0418 14:37:18.980730 138548147648320 metric_logger.py:196] completed step: 3, seconds: 0.419, TFLOP/s/device: 32.435, Tokens/s/device: 4888.995, total_weights: 65536, loss: 9.980, lm_loss: 9.980, perplexity: 21590.506
I0418 14:37:18.985244 138548147648320 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0418 14:37:19.275087 138548147648320 checkpointing.py:776] Waited 0.2898077964782715 seconds for step 5 to finish before starting checkpointing.
I0418 14:37:19.278150 138548147648320 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 14:37:21.680159 2757 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 14:37:24.506113 138422377318144 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/0/items/array_metadatas/process_5
I0418 14:37:59.254408 138422418593536 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.951 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.62164783477783 s) (per-host)
I0418 14:37:59.254523 138422418593536 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.337126s.
I0418 14:38:09.756718 138422418593536 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 51.839305s.
I0418 14:38:09.757029 138421330765568 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 14:38:09.757156 138421330765568 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 14:38:09.757213 138421330765568 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 14:38:09.758778 138421330765568 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 14:38:09.758941 138548147648320 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0418 14:38:09.759073 138548147648320 checkpoint_manager.py:1452] Waiting for previous save to complete took 50.480930 seconds. If this number is high, consider checkpointing less frequently.
I0418 14:38:09.762696 138548147648320 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 5
I0418 14:38:09.765113 138548147648320 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/5.
I0418 14:38:10.917186 138548147648320 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 14:38:10.917281 138548147648320 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 14:38:10.952497 138548147648320 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036352s
I0418 14:38:10.952665 138548147648320 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 38.694 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03986549377441406 s) (per-host)
I0418 14:38:10.952714 138548147648320 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.039925s (batch_requests_ready=0.001886s, total_serialization_initiated=0.037971s, others=0.000067s)
I0418 14:38:10.952810 138548147648320 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.044994s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.044979)
I0418 14:38:10.953548 138548147648320 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.19 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/5.
I0418 14:38:10.953836 138421330765568 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 14:58:10.953813
I0418 14:38:10.962554 138548147648320 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 14:38:10.962807 138422377318144 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 14:38:10.962940 138548147648320 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776523039.2781131, 'wait_for_prev_duration_secs': 50.48093008995056, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776523089.762735, 'checkpointer_blocking_duration_secs': 1.1912035942077637, 'get_old_steps_start_time': 1776523090.9539638, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776523039.275696, 'checkpoint_manager_blocking_duration_secs': 51.6872022151947}
I0418 14:38:10.963055 138548147648320 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0418 14:38:10.963865 138548147648320 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.743, Tokens/s/device: 13376.354, total_weights: 65536, loss: 9.460, lm_loss: 9.460, perplexity: 12840.355
I0418 14:38:10.969916 138548147648320 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.154, Tokens/s/device: 13890.490, total_weights: 65536, loss: 8.959, lm_loss: 8.959, perplexity: 7776.467
I0418 14:38:16.974886 138394319431424 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/5/items/array_metadatas/process_5
I0418 14:38:35.705868 138548147648320 metric_logger.py:196] completed step: 6, seconds: 51.983, TFLOP/s/device: 0.261, Tokens/s/device: 39.397, total_weights: 65536, loss: 8.469, lm_loss: 8.469, perplexity: 4762.740
I0418 14:38:35.853213 138548147648320 metric_logger.py:196] completed step: 7, seconds: 24.590, TFLOP/s/device: 0.553, Tokens/s/device: 83.287, total_weights: 65536, loss: 8.003, lm_loss: 8.003, perplexity: 2989.151
I0418 14:38:36.000576 138548147648320 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.113, Tokens/s/device: 13432.062, total_weights: 65536, loss: 7.572, lm_loss: 7.572, perplexity: 1943.098
I0418 14:38:36.147336 138548147648320 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0418 14:38:36.147976 138548147648320 checkpointing.py:776] Waited 0.0006582736968994141 seconds for step 9 to finish before starting checkpointing.
I0418 14:38:36.150162 138548147648320 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 14:38:53.428058 138421330765568 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.154 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.515219926834106 s) (per-host)
I0418 14:38:53.428178 138421330765568 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.474264s.
I0418 14:39:01.519884 138421330765568 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 50.565953s.
I0418 14:39:01.520090 138422377318144 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 14:39:01.520158 138422377318144 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 14:39:01.520211 138422377318144 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0418 14:39:01.522152 138422377318144 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0418 14:39:01.522316 138548147648320 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5.
W0418 14:39:01.522445 138548147648320 checkpoint_manager.py:1452] Waiting for previous save to complete took 25.372290 seconds. If this number is high, consider checkpointing less frequently.
I0418 14:39:01.523936 138548147648320 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9
I0418 14:39:01.525999 138548147648320 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/9.
I0418 14:39:02.232501 138548147648320 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 14:39:02.232591 138548147648320 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 14:39:02.267671 138548147648320 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036153s
I0418 14:39:02.267843 138548147648320 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 38.871 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.039684295654296875 s) (per-host)
I0418 14:39:02.267894 138548147648320 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.039746s (batch_requests_ready=0.001756s, total_serialization_initiated=0.037923s, others=0.000066s)
I0418 14:39:02.267983 138548147648320 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.043985s (all_items=0.000011s, per_item={'items': '0.00001097'}, temp_paths=0.043974)
I0418 14:39:02.268692 138548147648320 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.74 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/9.
I0418 14:39:02.269033 138422377318144 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 14:59:02.268995
I0418 14:39:02.270959 138548147648320 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 14:39:02.271206 138419175245568 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 14:39:02.271362 138548147648320 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776523116.150131, 'wait_for_prev_duration_secs': 25.372289896011353, 'time_between_consecutive_saves_sec': 26.391313552856445, 'checkpointer_blocking_start_time': 1776523141.5239732, 'checkpointer_blocking_duration_secs': 0.7452020645141602, 'get_old_steps_start_time': 1776523142.2691925, 'get_old_steps_duration_secs': 2.4557113647460938e-05, 'checkpoint_manager_blocking_start_time': 1776523116.1482096, 'checkpoint_manager_blocking_duration_secs': 26.12311887741089}
I0418 14:39:02.271490 138548147648320 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0418 14:39:02.271533 138548147648320 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 14:39:09.063063 138394319431424 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_16_zarr3_false/checkpoints/9/items/array_metadatas/process_5
I0418 14:39:44.976220 138422377318144 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 36.951 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.74802780151367 s) (per-host)
I0418 14:39:44.976328 138422377318144 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.707181s.
I0418 14:39:53.969852 138422377318144 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 51.700689s.
I0418 14:39:53.970129 138419175245568 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 14:39:53.970245 138419175245568 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 14:39:53.970286 138419175245568 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0418 14:39:53.971977 138419175245568 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0418 14:39:53.972141 138548147648320 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0418 14:39:53.972283 138548147648320 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 14:39:53.973183 138548147648320 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.385, Tokens/s/device: 13925.247, total_weights: 65536, loss: 7.181, lm_loss: 7.181, perplexity: 1314.495
Per train step:
Total TFLOPs: 13.59
split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 18 14:40:04 UTC 2026
EXIT_CODE=0