XPK Start: Sun Apr 19 18:17:28 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-19 18:17:52.753285: 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)
I0419 18:17:53.293206 135611359127360 max_utils.py:273] Attempting to initialize the jax distributed system...
I0419 18:18:02.335359 135611359127360 distributed.py:149] Starting JAX distributed service on [::]:8482
I0419 18:18:02.337694 135611359127360 distributed.py:172] Connecting to JAX distributed service on mt-04-int8-f32cx-slice-job-0-0.mt-04-int8-f32cx:8482
I0419 18:18:04.213380 135611359127360 max_utils.py:284] Jax distributed system initialized!
I0419 18:18:10.285667 135611359127360 max_utils.py:800] System Information: Jax Version: 0.9.2
I0419 18:18:10.285769 135611359127360 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0419 18:18:10.285807 135611359127360 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
I0419 18:18:10.285841 135611359127360 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0419 18:18:11.022398 135611359127360 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0419 18:18:11.022812 135611359127360 checkpointing.py:677] Setting up checkpoint logger...
I0419 18:18:11.022868 135611359127360 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0419 18:18:11.022912 135611359127360 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0419 18:18:11.023247 135611359127360 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 0x7b55d9f14230>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0419 18:18:14.063397 135611359127360 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0419 18:18:14.063781 135611359127360 checkpoint_manager.py:708] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b417c463b00>}, handler_registry=None
I0419 18:18:14.064023 135611359127360 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b417c463b00>` 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`.
I0419 18:18:14.064071 135611359127360 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b417c3c61b0>` 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`.
I0419 18:18:14.064105 135611359127360 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 0x7b417c463b00>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b417c463b00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b417c3c61b0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b417c3c61b0>}).
I0419 18:18:14.064431 135611359127360 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0419 18:18:14.064506 135611359127360 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b40a47f77e0> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0419 18:18:15.121534 135611359127360 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints
I0419 18:18:15.585783 135611359127360 checkpoint_manager.py:929] [process=6][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_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b417c3c4440>
I0419 18:18:15.585953 135611359127360 checkpointing.py:301] Checkpoint manager created!
I0419 18:18:16.722642 135611359127360 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0419 18:18:16.722757 135611359127360 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:18:17.106274 135611359127360 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 18:18:17.106366 135611359127360 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:18:17.122425 135611359127360 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 18:18:17.122498 135611359127360 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:18:17.189075 135611359127360 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 18:18:17.189163 135611359127360 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:18:17.205303 135611359127360 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 18:18:17.205366 135611359127360 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:18:17.221619 135611359127360 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 18:18:17.221678 135611359127360 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:18:17.246205 135611359127360 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0419 18:18:17.246274 135611359127360 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:18:17.314240 135611359127360 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0419 18:18:17.314324 135611359127360 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0419 18:18:17.834338 135611359127360 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0419 18:18:17.834459 135611359127360 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0419 18:18:19.873654 135611359127360 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0419 18:18:19.873779 135611359127360 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)
I0419 18:18:19.873832 135611359127360 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)
I0419 18:18:19.873890 135611359127360 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')
I0419 18:18:19.873946 135611359127360 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)
I0419 18:18:19.873986 135611359127360 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)
I0419 18:18:19.874041 135611359127360 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)
I0419 18:18:19.874095 135611359127360 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')
I0419 18:18:19.874136 135611359127360 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)
I0419 18:18:19.874174 135611359127360 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)
I0419 18:18:19.874221 135611359127360 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0419 18:18:19.874267 135611359127360 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0419 18:18:21.717385 135611359127360 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 18:18:21.717495 135611359127360 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 18:18:21.733727 135611359127360 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 18:18:21.733790 135611359127360 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 18:18:35.245478 135611359127360 max_utils.py:791] Total memory size: 1.8 GB, Output size: 0.4 GB, Temp size: 1.4 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0419 18:18:35.246288 135611359127360 metric_logger.py:301] number parameters: 1.104 billion
I0419 18:18:50.460363 135611359127360 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0419 18:18:50.699476 135611359127360 checkpointing.py:776] Waited 0.23905563354492188 seconds for step 0 to finish before starting checkpointing.
I0419 18:18:50.706314 135611359127360 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 18:18:50.707862 135611359127360 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0
I0419 18:18:50.709259 135611359127360 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints/0.
I0419 18:18:51.477919 135611359127360 signaling_client.py:364] Using JaxDistributedSignalingClient
I0419 18:18:51.478909 135611359127360 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 18:18:51.478966 135611359127360 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
I0419 18:18:51.769770 135611359127360 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.291924s
I0419 18:18:51.769945 135611359127360 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.184 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2975654602050781 s) (per-host)
I0419 18:18:51.769996 135611359127360 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.297627s (batch_requests_ready=0.002389s, total_serialization_initiated=0.295169s, others=0.000069s)
I0419 18:18:51.770086 135611359127360 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.301710s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.301692)
I0419 18:18:51.770845 135611359127360 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.06 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints/0.
I0419 18:18:51.771110 135479590754048 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 18:38:51.771088
I0419 18:18:51.773141 135611359127360 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 18:18:51.773371 135478514792192 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0419 18:18:51.773487 135611359127360 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776622730.7062948, 'wait_for_prev_duration_secs': 6.532669067382812e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776622730.7079, 'checkpointer_blocking_duration_secs': 1.063309669494629, 'get_old_steps_start_time': 1776622731.7712355, 'get_old_steps_duration_secs': 3.0994415283203125e-05, 'checkpoint_manager_blocking_start_time': 1776622730.7000296, 'checkpoint_manager_blocking_duration_secs': 1.073418140411377}
I0419 18:18:51.773643 135611359127360 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0419 18:18:51.773694 135611359127360 max_utils.py:750]
Memstats: After params initialized:
I0419 18:18:51.773743 135611359127360 max_utils.py:756] Using (GB) 0.44 / 31.25 (1.408000%) on TPU_24(process=6,(0,6,0,0))
I0419 18:18:51.773774 135611359127360 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0419 18:18:51.773799 135611359127360 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0419 18:18:51.773823 135611359127360 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0419 18:18:52.102863 135611359127360 metric_logger.py:196] completed step: 0, seconds: 15.214, TFLOP/s/device: 0.893, Tokens/s/device: 134.613, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52796.277
I0419 18:18:52.346772 135611359127360 metric_logger.py:196] completed step: 1, seconds: 1.641, TFLOP/s/device: 8.281, Tokens/s/device: 1248.128, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52796.277
I0419 18:18:52.787103 135611359127360 metric_logger.py:196] completed step: 2, seconds: 0.015, TFLOP/s/device: 913.912, Tokens/s/device: 137754.759, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28634.820
I0419 18:18:53.016533 135611359127360 metric_logger.py:196] completed step: 3, seconds: 0.441, TFLOP/s/device: 30.815, Tokens/s/device: 4644.770, total_weights: 65536, loss: 9.731, lm_loss: 9.731, perplexity: 16827.199
I0419 18:18:53.476527 135611359127360 metric_logger.py:196] completed step: 4, seconds: 0.235, TFLOP/s/device: 57.861, Tokens/s/device: 8721.463, total_weights: 65536, loss: 9.272, lm_loss: 9.272, perplexity: 10638.531
I0419 18:18:53.482656 135611359127360 metric_logger.py:196] completed step: 5, seconds: 0.230, TFLOP/s/device: 59.203, Tokens/s/device: 8923.747, total_weights: 65536, loss: 8.887, lm_loss: 8.887, perplexity: 7233.941
I0419 18:18:54.992011 2957 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0419 18:18:57.531855 135478523184896 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints/0/items/array_metadatas/process_6
I0419 18:19:23.349889 135611359127360 metric_logger.py:196] completed step: 6, seconds: 0.460, TFLOP/s/device: 29.518, Tokens/s/device: 4449.311, total_weights: 65536, loss: 8.588, lm_loss: 8.588, perplexity: 5365.468
I0419 18:19:23.579161 135611359127360 metric_logger.py:196] completed step: 7, seconds: 29.639, TFLOP/s/device: 0.458, Tokens/s/device: 69.098, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4358.779
I0419 18:19:23.808754 135611359127360 metric_logger.py:196] completed step: 8, seconds: 0.234, TFLOP/s/device: 58.062, Tokens/s/device: 8751.725, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.453
I0419 18:19:24.037546 135611359127360 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0419 18:19:24.038269 135611359127360 checkpointing.py:776] Waited 0.0007441043853759766 seconds for step 9 to finish before starting checkpointing.
I0419 18:19:24.040277 135611359127360 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 18:19:25.643794 135479590754048 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 46.226 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 34.17137694358826 s) (per-host)
I0419 18:19:25.643918 135479590754048 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 33.872740s.
I0419 18:19:34.606903 135479590754048 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 42.835710s.
I0419 18:19:34.607111 135478514792192 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 18:19:34.607185 135478514792192 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0419 18:19:34.607234 135478514792192 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0419 18:19:34.609359 135478514792192 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0419 18:19:34.609536 135611359127360 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0419 18:19:34.609669 135611359127360 checkpoint_manager.py:1452] Waiting for previous save to complete took 10.569393 seconds. If this number is high, consider checkpointing less frequently.
I0419 18:19:34.611444 135611359127360 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 9
I0419 18:19:34.613358 135611359127360 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints/9.
I0419 18:19:34.893423 135611359127360 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 18:19:34.893514 135611359127360 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
I0419 18:19:34.926793 135611359127360 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.035225s
I0419 18:19:34.926958 135611359127360 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 39.690 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03886580467224121 s) (per-host)
I0419 18:19:34.927009 135611359127360 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038926s (batch_requests_ready=0.001967s, total_serialization_initiated=0.036893s, others=0.000066s)
I0419 18:19:34.927104 135611359127360 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.042995s (all_items=0.000015s, per_item={'items': '0.00001478'}, temp_paths=0.042980)
I0419 18:19:34.927831 135611359127360 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.32 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints/9.
I0419 18:19:34.928137 135478514792192 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 18:39:34.928105
I0419 18:19:34.930103 135611359127360 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 18:19:34.930387 135478523184896 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0419 18:19:34.930567 135611359127360 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776622764.0402467, 'wait_for_prev_duration_secs': 10.569392919540405, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776622774.6114824, 'checkpointer_blocking_duration_secs': 0.3168060779571533, 'get_old_steps_start_time': 1776622774.9283116, 'get_old_steps_duration_secs': 3.218650817871094e-05, 'checkpoint_manager_blocking_start_time': 1776622764.0385182, 'checkpoint_manager_blocking_duration_secs': 10.892014503479004}
I0419 18:19:34.930671 135611359127360 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0419 18:19:34.930714 135611359127360 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 18:19:40.546004 135455181879040 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_04_int8/checkpoints/9/items/array_metadatas/process_6
I0419 18:20:14.655169 135478514792192 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 39.721 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 39.76702833175659 s) (per-host)
I0419 18:20:14.655297 135478514792192 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 39.727041s.
I0419 18:20:26.440520 135478514792192 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 51.512249s.
I0419 18:20:26.440808 135478523184896 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 18:20:26.440961 135478523184896 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0419 18:20:26.441008 135478523184896 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0419 18:20:26.443790 135478523184896 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0419 18:20:26.443972 135611359127360 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0419 18:20:26.444140 135611359127360 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 18:20:26.445184 135611359127360 metric_logger.py:196] completed step: 9, seconds: 0.229, TFLOP/s/device: 59.284, Tokens/s/device: 8935.895, total_weights: 65536, loss: 8.175, lm_loss: 8.175, perplexity: 3552.333
Per train step:
Total TFLOPs: 13.59
split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sun Apr 19 18:20:38 UTC 2026
EXIT_CODE=0