XPK Start: Sat Apr 18 13:33:12 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-18 13:33:36.526907: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303)
I0418 13:33:36.705480 132411919058752 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 13:33:45.747109 132411919058752 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 13:33:45.749516 132411919058752 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-true-7oltz-slice-job-0-0.mt-10-shardy-true-7oltz:8482
I0418 13:33:47.932870 132411919058752 max_utils.py:284] Jax distributed system initialized!
I0418 13:33:53.953920 132411919058752 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 13:33:53.954021 132411919058752 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 13:33:53.954060 132411919058752 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365
I0418 13:33:53.954094 132411919058752 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 13:33:54.648600 132411919058752 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 13:33:54.648901 132411919058752 checkpointing.py:677] Setting up checkpoint logger...
I0418 13:33:54.648954 132411919058752 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0418 13:33:54.648998 132411919058752 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 13:33:54.649330 132411919058752 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 0x786cf1914f50>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 13:33:57.687715 132411919058752 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 13:33:57.687957 132411919058752 checkpoint_manager.py:708] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786bc9e6f980>}, handler_registry=None
I0418 13:33:57.688194 132411919058752 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786bc9e6f980>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`.
I0418 13:33:57.688241 132411919058752 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x785880421550>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`.
I0418 13:33:57.688276 132411919058752 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 0x786bc9e6f980>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786bc9e6f980>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x785880421550>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x785880421550>}).
I0418 13:33:57.688580 132411919058752 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 13:33:57.688659 132411919058752 async_checkpointer.py:192] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7858803b0180> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 13:33:59.698498 132411919058752 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints
I0418 13:34:00.577339 132411919058752 checkpoint_manager.py:929] [process=3][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x785880631280>
I0418 13:34:00.577512 132411919058752 checkpointing.py:301] Checkpoint manager created!
I0418 13:34:01.510540 132411919058752 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 13:34:01.510677 132411919058752 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 13:34:01.889106 132411919058752 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 13:34:01.889197 132411919058752 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 13:34:01.905504 132411919058752 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 13:34:01.905564 132411919058752 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 13:34:01.929007 132411919058752 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 13:34:01.929073 132411919058752 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 13:34:01.945299 132411919058752 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 13:34:01.945362 132411919058752 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 13:34:01.961565 132411919058752 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 13:34:01.961634 132411919058752 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 13:34:01.986079 132411919058752 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 13:34:01.986148 132411919058752 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 13:34:02.008003 132411919058752 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 13:34:02.008067 132411919058752 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 13:34:02.223590 132411919058752 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 13:34:02.223705 132411919058752 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 13:34:03.651479 132411919058752 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0418 13:34:03.651609 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wi_0/kernel
Shape: float32[2048,16,7168]
Logical: P('embed', 'layers', 'mlp')
Physical: ('fsdp', None, None)
I0418 13:34:03.651676 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wi_1/kernel
Shape: float32[2048,16,7168]
Logical: P('embed', 'layers', 'mlp')
Physical: ('fsdp', None, None)
I0418 13:34:03.651736 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wo/kernel
Shape: float32[7168,16,2048]
Logical: P('mlp', 'layers', 'embed')
Physical: (None, None, 'fsdp')
I0418 13:34:03.651790 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/post_self_attention_layer_norm/scale
Shape: float32[2048,16]
Logical: P('norm', 'layers')
Physical: (None, None)
I0418 13:34:03.651829 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/pre_self_attention_layer_norm/scale
Shape: float32[2048,16]
Logical: P('norm', 'layers')
Physical: (None, None)
I0418 13:34:03.651882 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/self_attention/key/kernel
Shape: float32[2048,16,16,128]
Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim')
Physical: ('fsdp', None, None, None)
I0418 13:34:03.651933 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/self_attention/out/kernel
Shape: float32[16,16,128,2048]
Logical: P('heads', 'layers', 'kv', 'embed')
Physical: (None, None, None, 'fsdp')
I0418 13:34:03.651972 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/self_attention/query/kernel
Shape: float32[2048,16,16,128]
Logical: P('embed', 'layers', 'q_heads', 'kv')
Physical: ('fsdp', None, None, None)
I0418 13:34:03.652009 132411919058752 maxtext_utils.py:1654] params/params/decoder/layers/self_attention/value/kernel
Shape: float32[2048,16,16,128]
Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim')
Physical: ('fsdp', None, None, None)
I0418 13:34:03.652058 132411919058752 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0418 13:34:03.652104 132411919058752 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0418 13:34:04.143970 132411919058752 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 13:34:04.144074 132411919058752 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 13:34:04.159417 132411919058752 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 13:34:04.159483 132411919058752 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 13:34:15.096169 132411919058752 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 13:34:15.096998 132411919058752 metric_logger.py:301] number parameters: 1.104 billion
I0418 13:34:26.209679 132411919058752 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 13:34:26.368608 132411919058752 checkpointing.py:776] Waited 0.15890908241271973 seconds for step 0 to finish before starting checkpointing.
I0418 13:34:26.371255 132411919058752 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 13:34:26.372909 132411919058752 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 0
I0418 13:34:26.374438 132411919058752 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints/0.
I0418 13:34:27.135838 132411919058752 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 13:34:27.136999 132411919058752 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 13:34:27.137056 132411919058752 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0418 13:34:27.419094 132411919058752 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.283329s
I0418 13:34:27.419261 132411919058752 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 5.345 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2886066436767578 s) (per-host)
I0418 13:34:27.419314 132411919058752 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.288669s (batch_requests_ready=0.002144s, total_serialization_initiated=0.286454s, others=0.000071s)
I0418 13:34:27.419400 132411919058752 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.292824s (all_items=0.000017s, per_item={'items': '0.00001740'}, temp_paths=0.292806)
I0418 13:34:27.420143 132411919058752 event_tracking.py:125] [process=3] [async] Finished blocking save in 1.05 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints/0.
I0418 13:34:27.420488 132283440817920 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 13:54:27.420450
I0418 13:34:27.428303 132411919058752 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 13:34:27.428543 132281798874880 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0418 13:34:27.428677 132411919058752 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776519266.3712366, 'wait_for_prev_duration_secs': 6.151199340820312e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776519266.3729467, 'checkpointer_blocking_duration_secs': 1.0477111339569092, 'get_old_steps_start_time': 1776519267.420684, 'get_old_steps_duration_secs': 3.218650817871094e-05, 'checkpoint_manager_blocking_start_time': 1776519266.369149, 'checkpoint_manager_blocking_duration_secs': 1.0594890117645264}
I0418 13:34:27.428779 132411919058752 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 13:34:27.428837 132411919058752 max_utils.py:750]
Memstats: After params initialized:
I0418 13:34:27.428886 132411919058752 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0))
I0418 13:34:27.428918 132411919058752 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0))
I0418 13:34:27.428944 132411919058752 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0))
I0418 13:34:27.428973 132411919058752 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0))
I0418 13:34:27.748465 132411919058752 metric_logger.py:196] completed step: 0, seconds: 11.113, TFLOP/s/device: 1.223, Tokens/s/device: 184.296, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 13:34:27.918541 132411919058752 metric_logger.py:196] completed step: 1, seconds: 1.537, TFLOP/s/device: 8.839, Tokens/s/device: 1332.270, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 13:34:28.306814 132411919058752 metric_logger.py:196] completed step: 2, seconds: 0.023, TFLOP/s/device: 593.610, Tokens/s/device: 89475.294, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0418 13:34:28.454288 132411919058752 metric_logger.py:196] completed step: 3, seconds: 0.389, TFLOP/s/device: 34.970, Tokens/s/device: 5271.055, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0418 13:34:28.749647 132411919058752 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.759, Tokens/s/device: 13378.713, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0418 13:34:28.755663 132411919058752 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.196, Tokens/s/device: 13896.711, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0418 13:34:31.565166 2812 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 13:34:34.969381 132281838597888 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints/0/items/array_metadatas/process_3
I0418 13:34:54.487817 132411919058752 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.931, Tokens/s/device: 6923.176, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0418 13:34:54.635340 132411919058752 metric_logger.py:196] completed step: 7, seconds: 25.586, TFLOP/s/device: 0.531, Tokens/s/device: 80.045, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0418 13:34:54.782596 132411919058752 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.309, Tokens/s/device: 13461.640, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0418 13:34:54.929354 132411919058752 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0418 13:34:54.930046 132411919058752 checkpointing.py:776] Waited 0.0007126331329345703 seconds for step 9 to finish before starting checkpointing.
I0418 13:34:54.932116 132411919058752 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 13:35:03.350160 132283440817920 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 43.612 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.21946358680725 s) (per-host)
I0418 13:35:03.350286 132283440817920 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 35.929683s.
I0418 13:35:15.121863 132283440817920 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 47.701245s.
I0418 13:35:15.122167 132281798874880 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 13:35:15.122293 132281798874880 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0418 13:35:15.122344 132281798874880 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 13:35:15.123969 132281798874880 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 13:35:15.124144 132411919058752 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0418 13:35:15.124280 132411919058752 checkpoint_manager.py:1452] Waiting for previous save to complete took 20.192162 seconds. If this number is high, consider checkpointing less frequently.
I0418 13:35:15.126150 132411919058752 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 9
I0418 13:35:15.128173 132411919058752 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints/9.
I0418 13:35:15.846003 132411919058752 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 13:35:15.846096 132411919058752 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0418 13:35:15.881837 132411919058752 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036938s
I0418 13:35:15.881974 132411919058752 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 38.313 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.040262699127197266 s) (per-host)
I0418 13:35:15.882022 132411919058752 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.040320s (batch_requests_ready=0.001719s, total_serialization_initiated=0.038538s, others=0.000063s)
I0418 13:35:15.882104 132411919058752 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.044564s (all_items=0.000033s, per_item={'items': '0.00003266'}, temp_paths=0.044531)
I0418 13:35:15.882816 132411919058752 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.76 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints/9.
I0418 13:35:15.883096 132281798874880 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 13:55:15.883073
I0418 13:35:15.885083 132411919058752 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 13:35:15.885300 132261261256448 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0418 13:35:15.885420 132411919058752 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776519294.9320872, 'wait_for_prev_duration_secs': 20.192161560058594, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776519315.1261885, 'checkpointer_blocking_duration_secs': 0.7570140361785889, 'get_old_steps_start_time': 1776519315.883226, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776519294.930275, 'checkpoint_manager_blocking_duration_secs': 20.955111503601074}
I0418 13:35:15.885527 132411919058752 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0418 13:35:15.885568 132411919058752 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 13:35:23.579685 132281838597888 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_125719/linen_xpk_main_20260418_125719_10_shardy_true/checkpoints/9/items/array_metadatas/process_3
I0418 13:35:58.573229 132281798874880 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 36.966 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.731486320495605 s) (per-host)
I0418 13:35:58.573336 132281798874880 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.690158s.
I0418 13:36:09.425092 132281798874880 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 53.541899s.
I0418 13:36:09.425414 132261261256448 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 13:36:09.425484 132261261256448 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0418 13:36:09.425530 132261261256448 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0418 13:36:09.427272 132261261256448 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0418 13:36:09.427452 132411919058752 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0418 13:36:09.427599 132411919058752 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 13:36:09.428658 132411919058752 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.266, Tokens/s/device: 13907.375, 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 13:36:17 UTC 2026
EXIT_CODE=0