XPK Start: Sat Apr 18 18:45:37 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 18:46:01.812180: 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 18:46:02.342470 139355902109504 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 18:46:11.384293 139355902109504 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 18:46:11.386642 139355902109504 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-false-kxha8-slice-job-0-0.mt-10-shardy-false-kxha8:8482
I0418 18:46:12.177243 139355902109504 max_utils.py:284] Jax distributed system initialized!
I0418 18:46:18.292302 139355902109504 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 18:46:18.292402 139355902109504 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 18:46:18.292442 139355902109504 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 18:46:18.292492 139355902109504 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 18:46:18.996400 139355902109504 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 18:46:18.996696 139355902109504 checkpointing.py:677] Setting up checkpoint logger...
I0418 18:46:18.996758 139355902109504 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0418 18:46:18.996803 139355902109504 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 18:46:18.997133 139355902109504 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 0x7ebdb7b16fc0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 18:46:22.649494 139355902109504 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 18:46:22.649749 139355902109504 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 0x7ebc8fcee6f0>}, handler_registry=None
I0418 18:46:22.650003 139355902109504 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ebc8fcee6f0>` 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 18:46:22.650065 139355902109504 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ea94c1768d0>` 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 18:46:22.650120 139355902109504 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 0x7ebc8fcee6f0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ebc8fcee6f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ea94c1768d0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ea94c1768d0>}).
I0418 18:46:22.650441 139355902109504 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 18:46:22.650527 139355902109504 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7ea85c403880> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 18:46:23.896248 139355902109504 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints
I0418 18:46:24.319441 139355902109504 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=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_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7ea94c172060>
I0418 18:46:24.319652 139355902109504 checkpointing.py:301] Checkpoint manager created!
I0418 18:46:25.233659 139355902109504 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 18:46:25.233771 139355902109504 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:46:25.617884 139355902109504 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 18:46:25.617974 139355902109504 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:46:25.634266 139355902109504 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 18:46:25.634326 139355902109504 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:46:25.657938 139355902109504 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 18:46:25.658007 139355902109504 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:46:25.679402 139355902109504 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 18:46:25.679508 139355902109504 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:46:25.695803 139355902109504 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 18:46:25.695863 139355902109504 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:46:25.721276 139355902109504 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 18:46:25.721347 139355902109504 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:46:25.742352 139355902109504 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 18:46:25.742417 139355902109504 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 18:46:25.957729 139355902109504 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 18:46:25.957834 139355902109504 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 18:46:27.341172 139355902109504 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0418 18:46:27.341293 139355902109504 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 18:46:27.341345 139355902109504 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 18:46:27.341400 139355902109504 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 18:46:27.341485 139355902109504 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 18:46:27.341555 139355902109504 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 18:46:27.341618 139355902109504 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 18:46:27.341670 139355902109504 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 18:46:27.341709 139355902109504 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 18:46:27.341745 139355902109504 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 18:46:27.341791 139355902109504 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0418 18:46:27.341839 139355902109504 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0418 18:46:27.832659 139355902109504 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 18:46:27.832752 139355902109504 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 18:46:27.847918 139355902109504 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 18:46:27.847978 139355902109504 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 18:46:38.751034 139355902109504 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 18:46:38.751928 139355902109504 metric_logger.py:301] number parameters: 1.104 billion
I0418 18:46:50.205392 139355902109504 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 18:46:50.372630 139355902109504 checkpointing.py:776] Waited 0.16721844673156738 seconds for step 0 to finish before starting checkpointing.
I0418 18:46:50.375202 139355902109504 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:46:50.377058 139355902109504 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0
I0418 18:46:50.378554 139355902109504 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints/0.
I0418 18:46:51.522650 139355902109504 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 18:46:51.523610 139355902109504 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:46:51.523671 139355902109504 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 18:46:51.794860 139355902109504 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.272285s
I0418 18:46:51.795035 139355902109504 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.553 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2778048515319824 s) (per-host)
I0418 18:46:51.795089 139355902109504 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.277869s (batch_requests_ready=0.002237s, total_serialization_initiated=0.275561s, others=0.000072s)
I0418 18:46:51.795179 139355902109504 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.281934s (all_items=0.000017s, per_item={'items': '0.00001669'}, temp_paths=0.281917)
I0418 18:46:51.795941 139355902109504 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.42 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints/0.
I0418 18:46:51.796278 139226800715520 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 19:06:51.796241
I0418 18:46:51.806780 139355902109504 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:46:51.807093 139226746173184 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:46:51.807246 139355902109504 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776538010.3751845, 'wait_for_prev_duration_secs': 6.246566772460938e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776538010.3770974, 'checkpointer_blocking_duration_secs': 1.4193315505981445, 'get_old_steps_start_time': 1776538011.7964513, 'get_old_steps_duration_secs': 3.814697265625e-05, 'checkpoint_manager_blocking_start_time': 1776538010.3731267, 'checkpoint_manager_blocking_duration_secs': 1.4340808391571045}
I0418 18:46:51.807355 139355902109504 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 18:46:51.807404 139355902109504 max_utils.py:750]
Memstats: After params initialized:
I0418 18:46:51.807464 139355902109504 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0))
I0418 18:46:51.807498 139355902109504 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0418 18:46:51.807527 139355902109504 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0418 18:46:51.807552 139355902109504 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0418 18:46:52.118390 139355902109504 metric_logger.py:196] completed step: 0, seconds: 11.453, TFLOP/s/device: 1.186, Tokens/s/device: 178.812, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 18:46:52.309910 139355902109504 metric_logger.py:196] completed step: 1, seconds: 1.911, TFLOP/s/device: 7.108, Tokens/s/device: 1071.432, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 18:46:52.721509 139355902109504 metric_logger.py:196] completed step: 2, seconds: 0.044, TFLOP/s/device: 307.979, Tokens/s/device: 46422.014, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0418 18:46:52.868733 139355902109504 metric_logger.py:196] completed step: 3, seconds: 0.412, TFLOP/s/device: 32.979, Tokens/s/device: 4970.982, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0418 18:46:53.163907 139355902109504 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.940, Tokens/s/device: 13405.949, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0418 18:46:53.169483 139355902109504 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.246, Tokens/s/device: 13904.353, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0418 18:46:55.968588 2809 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 18:46:58.472544 139226754565888 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_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints/0/items/array_metadatas/process_5
I0418 18:47:16.146224 139355902109504 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.976, Tokens/s/device: 6930.016, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0418 18:47:16.293702 139355902109504 metric_logger.py:196] completed step: 7, seconds: 22.830, TFLOP/s/device: 0.595, Tokens/s/device: 89.707, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0418 18:47:16.440944 139355902109504 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.235, Tokens/s/device: 13450.500, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0418 18:47:16.587806 139355902109504 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0418 18:47:16.588476 139355902109504 checkpointing.py:776] Waited 0.0006716251373291016 seconds for step 9 to finish before starting checkpointing.
I0418 18:47:16.590465 139355902109504 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 18:47:30.791839 139226800715520 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 40.219 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 39.274569511413574 s) (per-host)
I0418 18:47:30.791959 139226800715520 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 38.995572s.
I0418 18:47:39.321121 139226800715520 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 47.524718s.
I0418 18:47:39.321437 139226746173184 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:47:39.321567 139226746173184 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:47:39.321617 139226746173184 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:47:39.324641 139226746173184 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 18:47:39.324816 139355902109504 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 18:47:39.324952 139355902109504 checkpoint_manager.py:1452] Waiting for previous save to complete took 22.734497 seconds. If this number is high, consider checkpointing less frequently.
I0418 18:47:39.326681 139355902109504 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9
I0418 18:47:39.328622 139355902109504 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints/9.
I0418 18:47:40.039915 139355902109504 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:47:40.040009 139355902109504 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 18:47:40.074328 139355902109504 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.035544s
I0418 18:47:40.074491 139355902109504 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 39.529 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03902435302734375 s) (per-host)
I0418 18:47:40.074541 139355902109504 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.039084s (batch_requests_ready=0.001831s, total_serialization_initiated=0.037186s, others=0.000067s)
I0418 18:47:40.074626 139355902109504 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.043243s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.043227)
I0418 18:47:40.075281 139355902109504 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.75 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints/9.
I0418 18:47:40.075621 139226746173184 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 19:07:40.075583
I0418 18:47:40.077700 139355902109504 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:47:40.078047 139220445353728 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:47:40.078239 139355902109504 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776538036.590424, 'wait_for_prev_duration_secs': 22.73449683189392, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776538059.3267257, 'checkpointer_blocking_duration_secs': 0.7490432262420654, 'get_old_steps_start_time': 1776538060.0757914, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776538036.588701, 'checkpoint_manager_blocking_duration_secs': 23.489494800567627}
I0418 18:47:40.078377 139355902109504 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0418 18:47:40.078428 139355902109504 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 18:47:46.821598 139226754565888 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_180002/linen_xpk_main_20260418_180002_10_shardy_false/checkpoints/9/items/array_metadatas/process_5
I0418 18:48:22.178649 139226746173184 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.482 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.14315176010132 s) (per-host)
I0418 18:48:22.178758 139226746173184 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.103024s.
I0418 18:48:32.168947 139226746173184 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 52.093197s.
I0418 18:48:32.169241 139220445353728 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:48:32.169364 139220445353728 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:48:32.169418 139220445353728 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:48:32.171113 139220445353728 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0418 18:48:32.171308 139355902109504 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 18:48:32.171464 139355902109504 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:48:32.172433 139355902109504 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.236, Tokens/s/device: 13902.843, total_weights: 65536, loss: 8.179, lm_loss: 8.179, perplexity: 3564.635
Per train step:
Total TFLOPs: 13.59
split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 18 18:48:43 UTC 2026
EXIT_CODE=0