XPK Start: Sun Apr 19 18:48:54 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 18:49:18.215890: 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 18:49:18.750710 139370440296256 max_utils.py:273] Attempting to initialize the jax distributed system...
I0419 18:49:27.791500 139370440296256 distributed.py:149] Starting JAX distributed service on [::]:8482
I0419 18:49:27.793843 139370440296256 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-false-uroyj-slice-job-0-0.mt-10-shardy-false-uroyj:8482
I0419 18:49:29.990704 139370440296256 max_utils.py:284] Jax distributed system initialized!
I0419 18:49:35.016906 139370440296256 max_utils.py:800] System Information: Jax Version: 0.9.2
I0419 18:49:35.017010 139370440296256 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0419 18:49:35.017051 139370440296256 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 18:49:35.017087 139370440296256 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0419 18:49:35.707580 139370440296256 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0419 18:49:35.707849 139370440296256 checkpointing.py:677] Setting up checkpoint logger...
I0419 18:49:35.707902 139370440296256 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0419 18:49:35.707948 139370440296256 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0419 18:49:35.708276 139370440296256 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 0x7ec119918830>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0419 18:49:38.645201 139370440296256 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0419 18:49:38.645459 139370440296256 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 0x7ead582b6570>}, handler_registry=None
I0419 18:49:38.645699 139370440296256 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ead582b6570>` 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 18:49:38.645747 139370440296256 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ead58160530>` 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 18:49:38.645782 139370440296256 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 0x7ead582b6570>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ead582b6570>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ead58160530>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ead58160530>}).
I0419 18:49:38.646090 139370440296256 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0419 18:49:38.646160 139370440296256 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7eac5048f880> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0419 18:49:39.758282 139370440296256 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_10_shardy_false/checkpoints
I0419 18:49:40.021321 139370440296256 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_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7ead5815e240>
I0419 18:49:40.021526 139370440296256 checkpointing.py:301] Checkpoint manager created!
I0419 18:49:40.950120 139370440296256 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0419 18:49:40.950237 139370440296256 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:49:41.325118 139370440296256 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 18:49:41.325210 139370440296256 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:49:41.341340 139370440296256 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 18:49:41.341399 139370440296256 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:49:41.364856 139370440296256 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 18:49:41.364925 139370440296256 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:49:41.381129 139370440296256 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 18:49:41.381193 139370440296256 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:49:41.397361 139370440296256 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 18:49:41.397433 139370440296256 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:49:41.422721 139370440296256 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0419 18:49:41.422790 139370440296256 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:49:41.443537 139370440296256 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0419 18:49:41.443598 139370440296256 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0419 18:49:41.660679 139370440296256 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0419 18:49:41.660788 139370440296256 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0419 18:49:43.051841 139370440296256 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0419 18:49:43.051971 139370440296256 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 18:49:43.052031 139370440296256 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 18:49:43.052087 139370440296256 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 18:49:43.052142 139370440296256 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 18:49:43.052188 139370440296256 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 18:49:43.052243 139370440296256 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 18:49:43.052295 139370440296256 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 18:49:43.052335 139370440296256 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 18:49:43.052372 139370440296256 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 18:49:43.052431 139370440296256 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0419 18:49:43.052482 139370440296256 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0419 18:49:43.537107 139370440296256 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 18:49:43.537198 139370440296256 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 18:49:43.552385 139370440296256 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 18:49:43.552464 139370440296256 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 18:49:54.431418 139370440296256 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.
I0419 18:49:54.432259 139370440296256 metric_logger.py:301] number parameters: 1.104 billion
I0419 18:50:05.554975 139370440296256 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0419 18:50:05.710281 139370440296256 checkpointing.py:776] Waited 0.15528273582458496 seconds for step 0 to finish before starting checkpointing.
I0419 18:50:05.712654 139370440296256 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 18:50:05.714309 139370440296256 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0
I0419 18:50:05.715744 139370440296256 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_10_shardy_false/checkpoints/0.
I0419 18:50:06.001980 139370440296256 signaling_client.py:364] Using JaxDistributedSignalingClient
I0419 18:50:06.002989 139370440296256 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 18:50:06.003048 139370440296256 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 18:50:06.275325 139370440296256 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.273417s
I0419 18:50:06.275527 139370440296256 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.533 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.27881622314453125 s) (per-host)
I0419 18:50:06.275584 139370440296256 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.278885s (batch_requests_ready=0.002182s, total_serialization_initiated=0.276625s, others=0.000077s)
I0419 18:50:06.275678 139370440296256 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.283058s (all_items=0.000018s, per_item={'items': '0.00001836'}, temp_paths=0.283040)
I0419 18:50:06.276511 139370440296256 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.56 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_10_shardy_false/checkpoints/0.
I0419 18:50:06.276804 139245402777344 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 19:10:06.276771
I0419 18:50:06.285540 139370440296256 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 18:50:06.285830 139243263661824 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0419 18:50:06.285982 139370440296256 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776624605.7126358, 'wait_for_prev_duration_secs': 6.270408630371094e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776624605.714349, 'checkpointer_blocking_duration_secs': 0.5626034736633301, 'get_old_steps_start_time': 1776624606.2769763, 'get_old_steps_duration_secs': 2.8371810913085938e-05, 'checkpoint_manager_blocking_start_time': 1776624605.7108393, 'checkpoint_manager_blocking_duration_secs': 0.5751051902770996}
I0419 18:50:06.286085 139370440296256 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0419 18:50:06.286132 139370440296256 max_utils.py:750]
Memstats: After params initialized:
I0419 18:50:06.286182 139370440296256 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0))
I0419 18:50:06.286215 139370440296256 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0419 18:50:06.286240 139370440296256 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0419 18:50:06.286263 139370440296256 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0419 18:50:06.598587 139370440296256 metric_logger.py:196] completed step: 0, seconds: 11.123, TFLOP/s/device: 1.222, Tokens/s/device: 184.129, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0419 18:50:06.783921 139370440296256 metric_logger.py:196] completed step: 1, seconds: 1.042, TFLOP/s/device: 13.039, Tokens/s/device: 1965.406, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0419 18:50:07.194275 139370440296256 metric_logger.py:196] completed step: 2, seconds: 0.038, TFLOP/s/device: 356.001, Tokens/s/device: 53660.326, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0419 18:50:07.341402 139370440296256 metric_logger.py:196] completed step: 3, seconds: 0.411, TFLOP/s/device: 33.087, Tokens/s/device: 4987.215, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0419 18:50:07.636510 139370440296256 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.818, Tokens/s/device: 13387.633, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0419 18:50:07.642017 139370440296256 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.209, Tokens/s/device: 13898.692, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0419 18:50:09.521028 2792 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0419 18:50:12.974119 139243304949504 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_10_shardy_false/checkpoints/0/items/array_metadatas/process_6
I0419 18:50:30.585962 139370440296256 metric_logger.py:196] completed step: 6, seconds: 0.295, TFLOP/s/device: 46.081, Tokens/s/device: 6945.858, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0419 18:50:30.733285 139370440296256 metric_logger.py:196] completed step: 7, seconds: 22.797, TFLOP/s/device: 0.596, Tokens/s/device: 89.835, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0419 18:50:30.880660 139370440296256 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.378, Tokens/s/device: 13472.000, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0419 18:50:31.027337 139370440296256 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0419 18:50:31.027937 139370440296256 checkpointing.py:776] Waited 0.0006220340728759766 seconds for step 9 to finish before starting checkpointing.
I0419 18:50:31.030077 139370440296256 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 18:50:43.640349 139245402777344 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 41.962 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.64360237121582 s) (per-host)
I0419 18:50:43.640485 139245402777344 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.363573s.
I0419 18:50:51.682629 139245402777344 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 45.405700s.
I0419 18:50:51.682898 139243263661824 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 18:50:51.683017 139243263661824 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0419 18:50:51.683069 139243263661824 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0419 18:50:51.685047 139243263661824 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0419 18:50:51.685238 139370440296256 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 18:50:51.685383 139370440296256 checkpoint_manager.py:1452] Waiting for previous save to complete took 20.655297 seconds. If this number is high, consider checkpointing less frequently.
I0419 18:50:51.687208 139370440296256 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 9
I0419 18:50:51.689282 139370440296256 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_10_shardy_false/checkpoints/9.
I0419 18:50:52.411989 139370440296256 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 18:50:52.412086 139370440296256 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 18:50:52.445891 139370440296256 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.035157s
I0419 18:50:52.446059 139370440296256 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 39.977 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03858613967895508 s) (per-host)
I0419 18:50:52.446124 139370440296256 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038647s (batch_requests_ready=0.001782s, total_serialization_initiated=0.036796s, others=0.000069s)
I0419 18:50:52.446217 139370440296256 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.042769s (all_items=0.000016s, per_item={'items': '0.00001574'}, temp_paths=0.042753)
I0419 18:50:52.446850 139370440296256 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.76 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_10_shardy_false/checkpoints/9.
I0419 18:50:52.447172 139243263661824 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 19:10:52.447135
I0419 18:50:52.450470 139370440296256 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 18:50:52.450766 139243304949504 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0419 18:50:52.450948 139370440296256 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776624631.0300474, 'wait_for_prev_duration_secs': 20.65529704093933, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776624651.6872466, 'checkpointer_blocking_duration_secs': 0.760077953338623, 'get_old_steps_start_time': 1776624652.4473422, 'get_old_steps_duration_secs': 2.6464462280273438e-05, 'checkpoint_manager_blocking_start_time': 1776624631.028163, 'checkpoint_manager_blocking_duration_secs': 21.42274785041809}
I0419 18:50:52.451062 139370440296256 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0419 18:50:52.451112 139370440296256 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 18:50:58.502850 139217195755264 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_10_shardy_false/checkpoints/9/items/array_metadatas/process_6
I0419 18:51:34.286544 139243263661824 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.718 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.87903428077698 s) (per-host)
I0419 18:51:34.286653 139243263661824 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.839360s.
I0419 18:51:42.873805 139243263661824 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 50.426496s.
I0419 18:51:42.874104 139243304949504 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 18:51:42.874225 139243304949504 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0419 18:51:42.874274 139243304949504 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0419 18:51:42.876017 139243304949504 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0419 18:51:42.876205 139370440296256 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 18:51:42.876346 139370440296256 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 18:51:42.877379 139370440296256 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.230, Tokens/s/device: 13901.899, 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: Sun Apr 19 18:51:54 UTC 2026
EXIT_CODE=0