XPK Start: Fri Apr 17 23:59:58 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 00:00:36.589165: 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 00:00:36.768195 133091100694336 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 00:00:45.810735 133091100694336 distributed.py:172] Connecting to JAX distributed service on mt-01-base-la5vx-slice-job-0-0.mt-01-base-la5vx:8482
I0418 00:00:49.457620 133091100694336 max_utils.py:284] Jax distributed system initialized!
I0418 00:00:56.683860 133091100694336 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 00:00:56.683964 133091100694336 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 00:00:56.684063 133091100694336 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 00:00:56.684101 133091100694336 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 00:00:57.376799 133091100694336 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 00:00:57.377077 133091100694336 checkpointing.py:677] Setting up checkpoint logger...
I0418 00:00:57.377131 133091100694336 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0418 00:00:57.377174 133091100694336 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 00:00:57.377511 133091100694336 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 0x790af8150410>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 00:01:02.068987 133091100694336 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 00:01:02.069225 133091100694336 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 0x78f88c18a480>}, handler_registry=None
I0418 00:01:02.069492 133091100694336 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78f88c18a480>` 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 00:01:02.069544 133091100694336 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78f88c191d00>` 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 00:01:02.069587 133091100694336 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 0x78f88c18a480>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78f88c18a480>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78f88c191d00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78f88c191d00>}).
I0418 00:01:02.069957 133091100694336 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 00:01:02.070050 133091100694336 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x78f84c1740e0> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 00:01:04.556593 133091100694336 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints
I0418 00:01:05.442514 133091100694336 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_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x78f88c18b560>
I0418 00:01:05.442707 133091100694336 checkpointing.py:301] Checkpoint manager created!
I0418 00:01:06.385191 133091100694336 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 00:01:06.385309 133091100694336 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 00:01:06.765636 133091100694336 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 00:01:06.765735 133091100694336 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 00:01:06.781952 133091100694336 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 00:01:06.782019 133091100694336 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 00:01:06.805713 133091100694336 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 00:01:06.805780 133091100694336 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 00:01:06.822173 133091100694336 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 00:01:06.822235 133091100694336 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 00:01:06.844274 133091100694336 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 00:01:06.844371 133091100694336 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 00:01:06.869152 133091100694336 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 00:01:06.869222 133091100694336 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 00:01:06.891302 133091100694336 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 00:01:06.891370 133091100694336 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 00:01:07.110131 133091100694336 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 00:01:07.110246 133091100694336 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 00:01:08.526611 133091100694336 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0418 00:01:08.526755 133091100694336 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 00:01:08.526811 133091100694336 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 00:01:08.526871 133091100694336 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 00:01:08.526922 133091100694336 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 00:01:08.526962 133091100694336 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 00:01:08.527014 133091100694336 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 00:01:08.527070 133091100694336 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 00:01:08.527110 133091100694336 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 00:01:08.527146 133091100694336 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 00:01:08.527192 133091100694336 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0418 00:01:08.527237 133091100694336 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0418 00:01:09.018528 133091100694336 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 00:01:09.018625 133091100694336 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 00:01:09.033999 133091100694336 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 00:01:09.034059 133091100694336 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 00:01:19.454291 133091100694336 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 00:01:19.455075 133091100694336 metric_logger.py:301] number parameters: 1.104 billion
I0418 00:01:30.584674 133091100694336 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 00:01:31.448715 133091100694336 checkpointing.py:776] Waited 0.8639957904815674 seconds for step 0 to finish before starting checkpointing.
I0418 00:01:31.451213 133091100694336 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 00:01:31.453983 133091100694336 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0
I0418 00:01:31.455681 133091100694336 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints/0.
I0418 00:01:32.655796 133091100694336 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 00:01:32.656967 133091100694336 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 00:01:32.657028 133091100694336 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 00:01:32.935832 133091100694336 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.280108s
I0418 00:01:32.936007 133091100694336 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.403 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2854945659637451 s) (per-host)
I0418 00:01:32.936064 133091100694336 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.285563s (batch_requests_ready=0.002191s, total_serialization_initiated=0.283295s, others=0.000077s)
I0418 00:01:32.936156 133091100694336 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.289815s (all_items=0.000016s, per_item={'items': '0.00001597'}, temp_paths=0.289799)
I0418 00:01:32.937000 133091100694336 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.48 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints/0.
I0418 00:01:32.937314 132954351728384 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 00:21:32.937274
I0418 00:01:32.940331 133091100694336 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 00:01:32.940560 132951273846528 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 00:01:32.940682 133091100694336 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776470491.4511955, 'wait_for_prev_duration_secs': 6.0558319091796875e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776470491.4540257, 'checkpointer_blocking_duration_secs': 1.4834420680999756, 'get_old_steps_start_time': 1776470492.9374945, 'get_old_steps_duration_secs': 3.0040740966796875e-05, 'checkpoint_manager_blocking_start_time': 1776470491.4492147, 'checkpoint_manager_blocking_duration_secs': 1.4914283752441406}
I0418 00:01:32.940806 133091100694336 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 00:01:32.940858 133091100694336 max_utils.py:750]
Memstats: After params initialized:
I0418 00:01:32.940908 133091100694336 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0))
I0418 00:01:32.940951 133091100694336 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0418 00:01:32.940981 133091100694336 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0418 00:01:32.941005 133091100694336 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0418 00:01:33.260881 133091100694336 metric_logger.py:196] completed step: 0, seconds: 11.129, TFLOP/s/device: 1.221, Tokens/s/device: 184.016, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 00:01:33.446249 133091100694336 metric_logger.py:196] completed step: 1, seconds: 2.675, TFLOP/s/device: 5.080, Tokens/s/device: 765.708, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 00:01:33.874614 133091100694336 metric_logger.py:196] completed step: 2, seconds: 0.038, TFLOP/s/device: 357.547, Tokens/s/device: 53893.319, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0418 00:01:34.021960 133091100694336 metric_logger.py:196] completed step: 3, seconds: 0.428, TFLOP/s/device: 31.714, Tokens/s/device: 4780.278, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0418 00:01:34.317055 133091100694336 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.726, Tokens/s/device: 13373.820, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0418 00:01:34.322843 133091100694336 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.279, Tokens/s/device: 13909.264, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0418 00:01:38.465698 2555 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 00:01:43.283022 132951314380544 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints/0/items/array_metadatas/process_5
I0418 00:01:58.759164 133091100694336 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.952, Tokens/s/device: 6926.407, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0418 00:01:58.906520 133091100694336 metric_logger.py:196] completed step: 7, seconds: 24.289, TFLOP/s/device: 0.559, Tokens/s/device: 84.317, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0418 00:01:59.053896 133091100694336 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.124, Tokens/s/device: 13433.737, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0418 00:01:59.200628 133091100694336 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0418 00:01:59.201395 133091100694336 checkpointing.py:776] Waited 0.0007848739624023438 seconds for step 9 to finish before starting checkpointing.
I0418 00:01:59.203710 133091100694336 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 00:02:11.923563 132954351728384 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 40.221 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 39.2730348110199 s) (per-host)
I0418 00:02:11.923665 132954351728384 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 38.986241s.
I0418 00:02:28.073307 132954351728384 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 55.135866s.
I0418 00:02:28.073520 132951273846528 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 00:02:28.073575 132951273846528 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 00:02:28.073624 132951273846528 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 00:02:28.075295 132951273846528 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 00:02:28.075476 133091100694336 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 00:02:28.075618 133091100694336 checkpoint_manager.py:1452] Waiting for previous save to complete took 28.871927 seconds. If this number is high, consider checkpointing less frequently.
I0418 00:02:28.077353 133091100694336 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9
I0418 00:02:28.079436 133091100694336 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints/9.
I0418 00:02:29.209677 133091100694336 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 00:02:29.209787 133091100694336 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 00:02:29.242708 133091100694336 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034252s
I0418 00:02:29.242854 133091100694336 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 40.920 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.037697553634643555 s) (per-host)
I0418 00:02:29.242904 133091100694336 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.037756s (batch_requests_ready=0.001795s, total_serialization_initiated=0.035897s, others=0.000065s)
I0418 00:02:29.242986 133091100694336 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.041855s (all_items=0.000014s, per_item={'items': '0.00001383'}, temp_paths=0.041841)
I0418 00:02:29.243719 133091100694336 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.17 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints/9.
I0418 00:02:29.244065 132951273846528 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 00:22:29.244028
I0418 00:02:29.248216 133091100694336 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 00:02:29.248525 132936930150144 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 00:02:29.248706 133091100694336 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776470519.2036605, 'wait_for_prev_duration_secs': 28.8719265460968, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776470548.0773907, 'checkpointer_blocking_duration_secs': 1.1668164730072021, 'get_old_steps_start_time': 1776470549.2442322, 'get_old_steps_duration_secs': 3.1948089599609375e-05, 'checkpoint_manager_blocking_start_time': 1776470519.2016418, 'checkpoint_manager_blocking_duration_secs': 30.047013759613037}
I0418 00:02:29.248832 133091100694336 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0418 00:02:29.248880 133091100694336 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 00:02:39.408370 132951314380544 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_01_base/checkpoints/9/items/array_metadatas/process_5
I0418 00:03:15.271303 132951273846528 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 34.290 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 46.06611132621765 s) (per-host)
I0418 00:03:15.271412 132951273846528 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 46.027234s.
I0418 00:03:27.286582 132951273846528 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 58.042389s.
I0418 00:03:27.286887 132936930150144 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 00:03:27.287009 132936930150144 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 00:03:27.287056 132936930150144 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0418 00:03:27.288384 132936930150144 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0418 00:03:27.288558 133091100694336 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 00:03:27.288715 133091100694336 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 00:03:27.289704 133091100694336 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.352, Tokens/s/device: 13920.325, 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 00:03:38 UTC 2026
EXIT_CODE=0