XPK Start: Mon Apr 20 06:48:30 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-20 06:48:54.541051: 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) I0420 06:48:54.721792 133206972139328 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 06:49:03.763269 133206972139328 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 06:49:03.765604 133206972139328 distributed.py:172] Connecting to JAX distributed service on mt-14-async-ckpt-false--mz7z3-slice-job-0-0.mt-14-async-ckpt-false--mz7z3:8482 I0420 06:49:05.079426 133206972139328 max_utils.py:284] Jax distributed system initialized! I0420 06:49:10.259860 133206972139328 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 06:49:10.259960 133206972139328 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 06:49:10.260000 133206972139328 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 I0420 06:49:10.260035 133206972139328 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 06:49:10.954085 133206972139328 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 06:49:10.954354 133206972139328 checkpointing.py:677] Setting up checkpoint logger... I0420 06:49:10.954406 133206972139328 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 06:49:10.954451 133206972139328 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 06:49:10.954809 133206972139328 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 0x79260efeb5f0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 06:49:13.780032 133206972139328 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0420 06:49:13.780274 133206972139328 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 0x7924e69ec3b0>}, handler_registry=None I0420 06:49:13.780553 133206972139328 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7924e69ec3b0>` 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`. I0420 06:49:13.780623 133206972139328 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79125c7996a0>` 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`. I0420 06:49:13.780662 133206972139328 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 0x7924e69ec3b0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7924e69ec3b0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79125c7996a0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79125c7996a0>}). I0420 06:49:13.780968 133206972139328 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 06:49:14.998345 133206972139328 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints I0420 06:49:15.000633 133206972139328 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=False, 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=5), 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_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x79125c791df0> I0420 06:49:15.000743 133206972139328 checkpointing.py:301] Checkpoint manager created! I0420 06:49:15.929686 133206972139328 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 06:49:15.929807 133206972139328 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 06:49:16.306579 133206972139328 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 06:49:16.306681 133206972139328 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 06:49:16.322935 133206972139328 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 06:49:16.322991 133206972139328 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 06:49:16.346446 133206972139328 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 06:49:16.346513 133206972139328 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 06:49:16.362831 133206972139328 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 06:49:16.362890 133206972139328 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 06:49:16.379451 133206972139328 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 06:49:16.379514 133206972139328 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 06:49:16.404177 133206972139328 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 06:49:16.404245 133206972139328 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 06:49:16.426131 133206972139328 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 06:49:16.426193 133206972139328 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 06:49:16.641286 133206972139328 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0420 06:49:16.641393 133206972139328 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 06:49:18.067085 133206972139328 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0420 06:49:18.067207 133206972139328 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) I0420 06:49:18.067259 133206972139328 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) I0420 06:49:18.067315 133206972139328 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') I0420 06:49:18.067366 133206972139328 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) I0420 06:49:18.067404 133206972139328 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) I0420 06:49:18.067455 133206972139328 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) I0420 06:49:18.067505 133206972139328 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') I0420 06:49:18.067543 133206972139328 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) I0420 06:49:18.067577 133206972139328 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) I0420 06:49:18.067638 133206972139328 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0420 06:49:18.067685 133206972139328 maxtext_utils.py:1654] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0420 06:49:18.554743 133206972139328 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0420 06:49:18.554836 133206972139328 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0420 06:49:18.570202 133206972139328 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0420 06:49:18.570263 133206972139328 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0420 06:49:29.023233 133206972139328 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. I0420 06:49:29.025690 133206972139328 metric_logger.py:301] number parameters: 1.104 billion I0420 06:49:40.571104 133206972139328 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0420 06:49:40.747013 133206972139328 checkpointing.py:776] Waited 0.175886869430542 seconds for step 0 to finish before starting checkpointing. I0420 06:49:40.749494 133206972139328 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 06:49:40.752399 133206972139328 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0 I0420 06:49:40.754156 133206972139328 event_tracking.py:70] [process=5] [sync] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/0. I0420 06:49:43.302519 133206972139328 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 06:49:43.303811 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=1] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:49:44.982809 133206972139328 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0420 06:49:44.982912 133206972139328 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 I0420 06:49:45.263215 133206972139328 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.281741s I0420 06:49:45.263407 133206972139328 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.367 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28740930557250977 s) (per-host) I0420 06:49:45.263467 133206972139328 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.287479s (batch_requests_ready=0.002344s, total_serialization_initiated=0.285057s, others=0.000078s) I0420 06:49:45.263569 133206972139328 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 1.961135s (all_items=0.000043s, per_item={'items': '0.00004268'}, temp_paths=1.961093) I0420 06:49:45.263635 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=1] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:49:45.263674 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=1] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:49:45.275321 2709 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 06:49:47.286065 133078756357888 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/0/items/array_metadatas/process_5 I0420 06:50:19.022637 133206972139328 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 46.395 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 34.046576499938965 s) (per-host) I0420 06:50:24.653694 133206972139328 event_tracking.py:125] [process=5] [sync] Finished blocking save in 43.90 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/0. I0420 06:50:28.773694 133206972139328 event_tracking.py:138] [process=5] [sync] Finished save in 48.02 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/0 I0420 06:50:28.775712 133206972139328 checkpoint_manager.py:2137] [process=5][thread=MainThread][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 06:50:28.777537 133206972139328 checkpoint_manager.py:2146] [process=5][thread=MainThread][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 06:50:28.777598 133206972139328 checkpoint_manager.py:1581] [process=5][thread=MainThread][step=0] Finished synchronous save. I0420 06:50:28.777655 133206972139328 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': True, 'wait_for_prev_start_time': 1776667780.749476, 'wait_for_prev_duration_secs': 5.9604644775390625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776667780.7524378, 'checkpointer_blocking_duration_secs': 48.021374225616455, 'get_old_steps_start_time': 1776667828.7738516, 'get_old_steps_duration_secs': 2.5272369384765625e-05, 'checkpoint_manager_blocking_start_time': 1776667780.747525, 'checkpoint_manager_blocking_duration_secs': 48.03010034561157} I0420 06:50:28.777749 133206972139328 checkpointing.py:410] Saved a checkpoint at step 0. I0420 06:50:28.777792 133206972139328 max_utils.py:750] Memstats: After params initialized: I0420 06:50:28.777843 133206972139328 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0)) I0420 06:50:28.777875 133206972139328 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0)) I0420 06:50:28.777900 133206972139328 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0)) I0420 06:50:28.777924 133206972139328 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0)) I0420 06:50:29.092358 133206972139328 metric_logger.py:196] completed step: 0, seconds: 11.545, TFLOP/s/device: 1.177, Tokens/s/device: 177.388, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0420 06:50:29.267427 133206972139328 metric_logger.py:196] completed step: 1, seconds: 48.514, TFLOP/s/device: 0.280, Tokens/s/device: 42.214, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0420 06:50:29.693425 133206972139328 metric_logger.py:196] completed step: 2, seconds: 0.033, TFLOP/s/device: 408.463, Tokens/s/device: 61568.062, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38547.719 I0420 06:50:29.841014 133206972139328 metric_logger.py:196] completed step: 3, seconds: 0.426, TFLOP/s/device: 31.868, Tokens/s/device: 4803.464, total_weights: 65536, loss: 9.980, lm_loss: 9.980, perplexity: 21590.506 I0420 06:50:29.845397 133206972139328 checkpointing.py:772] Waiting for step 5 to finish before checkpoint... I0420 06:50:30.135139 133206972139328 checkpointing.py:776] Waited 0.2897059917449951 seconds for step 5 to finish before starting checkpointing. I0420 06:50:30.138012 133206972139328 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 06:50:30.139545 133206972139328 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 5 I0420 06:50:30.141375 133206972139328 event_tracking.py:70] [process=5] [sync] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/5. I0420 06:50:33.002961 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=2] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:50:34.528264 133206972139328 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0420 06:50:34.528359 133206972139328 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 I0420 06:50:34.573146 133206972139328 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046007s I0420 06:50:34.573334 133206972139328 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 30.997 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04976511001586914 s) (per-host) I0420 06:50:34.573389 133206972139328 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.049827s (batch_requests_ready=0.001782s, total_serialization_initiated=0.047976s, others=0.000068s) I0420 06:50:34.573488 133206972139328 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 1.571779s (all_items=0.000028s, per_item={'items': '0.00002837'}, temp_paths=1.571751) I0420 06:50:34.573530 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=2] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:50:34.573567 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=2] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:50:36.590185 133058749523712 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/5/items/array_metadatas/process_5 I0420 06:51:13.292059 133206972139328 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 40.744 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 38.76844930648804 s) (per-host) I0420 06:51:17.097206 133206972139328 event_tracking.py:125] [process=5] [sync] Finished blocking save in 46.96 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/5. I0420 06:51:21.689442 133206972139328 event_tracking.py:138] [process=5] [sync] Finished save in 51.55 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/5 I0420 06:51:21.691924 133206972139328 checkpoint_manager.py:2137] [process=5][thread=MainThread][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0420 06:51:21.693710 133206972139328 checkpoint_manager.py:2146] [process=5][thread=MainThread][step=5] CheckpointManager Save Finalize is done on all hosts. I0420 06:51:21.693762 133206972139328 checkpoint_manager.py:1581] [process=5][thread=MainThread][step=5] Finished synchronous save. I0420 06:51:21.693813 133206972139328 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': True, 'wait_for_prev_start_time': 1776667830.1379924, 'wait_for_prev_duration_secs': 6.127357482910156e-05, 'time_between_consecutive_saves_sec': 1.3604156970977783, 'checkpointer_blocking_start_time': 1776667830.1395833, 'checkpointer_blocking_duration_secs': 51.54997944831848, 'get_old_steps_start_time': 1776667881.6895814, 'get_old_steps_duration_secs': 5.459785461425781e-05, 'checkpoint_manager_blocking_start_time': 1776667830.135771, 'checkpoint_manager_blocking_duration_secs': 51.55801582336426} I0420 06:51:21.693910 133206972139328 checkpointing.py:410] Saved a checkpoint at step 5. I0420 06:51:21.694750 133206972139328 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.767, Tokens/s/device: 13379.937, total_weights: 65536, loss: 9.460, lm_loss: 9.460, perplexity: 12840.355 I0420 06:51:21.711521 133206972139328 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.227, Tokens/s/device: 13901.427, total_weights: 65536, loss: 8.959, lm_loss: 8.959, perplexity: 7776.467 I0420 06:51:44.519961 133206972139328 metric_logger.py:196] completed step: 6, seconds: 51.854, TFLOP/s/device: 0.262, Tokens/s/device: 39.496, total_weights: 65536, loss: 8.469, lm_loss: 8.469, perplexity: 4762.740 I0420 06:51:44.667389 133206972139328 metric_logger.py:196] completed step: 7, seconds: 22.673, TFLOP/s/device: 0.599, Tokens/s/device: 90.327, total_weights: 65536, loss: 8.003, lm_loss: 8.003, perplexity: 2989.151 I0420 06:51:44.814874 133206972139328 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.108, Tokens/s/device: 13431.270, total_weights: 65536, loss: 7.572, lm_loss: 7.572, perplexity: 1943.098 I0420 06:51:44.961549 133206972139328 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0420 06:51:44.962268 133206972139328 checkpointing.py:776] Waited 0.0007410049438476562 seconds for step 9 to finish before starting checkpointing. I0420 06:51:44.964262 133206972139328 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 06:51:44.966038 133206972139328 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9 I0420 06:51:44.967432 133206972139328 event_tracking.py:70] [process=5] [sync] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/9. I0420 06:51:47.655526 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=3] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:51:49.043843 133206972139328 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0420 06:51:49.043952 133206972139328 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 I0420 06:51:49.083939 133206972139328 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.041346s I0420 06:51:49.084118 133206972139328 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 34.287 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.044989824295043945 s) (per-host) I0420 06:51:49.084171 133206972139328 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045053s (batch_requests_ready=0.001770s, total_serialization_initiated=0.043215s, others=0.000069s) I0420 06:51:49.084281 133206972139328 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 1.430054s (all_items=0.000026s, per_item={'items': '0.00002599'}, temp_paths=1.430028) I0420 06:51:49.084326 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=3] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:51:49.084365 133206972139328 future.py:372] [process=5][thread=MainThread][operation_id=3] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0420 06:51:51.142156 133079807653632 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/9/items/array_metadatas/process_5 I0420 06:52:27.424084 133206972139328 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 41.151 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 38.38491678237915 s) (per-host) I0420 06:52:31.820281 133206972139328 event_tracking.py:125] [process=5] [sync] Finished blocking save in 46.85 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/9. I0420 06:52:35.824350 133206972139328 event_tracking.py:138] [process=5] [sync] Finished save in 50.86 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints/9 I0420 06:52:35.826992 133206972139328 checkpoint_manager.py:2137] [process=5][thread=MainThread][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 06:52:35.828614 133206972139328 checkpoint_manager.py:2146] [process=5][thread=MainThread][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 06:52:35.828664 133206972139328 checkpoint_manager.py:1581] [process=5][thread=MainThread][step=9] Finished synchronous save. I0420 06:52:35.828714 133206972139328 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_14_async_ckpt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': True, 'wait_for_prev_start_time': 1776667904.964246, 'wait_for_prev_duration_secs': 5.5789947509765625e-05, 'time_between_consecutive_saves_sec': 23.270496129989624, 'checkpointer_blocking_start_time': 1776667904.9660754, 'checkpointer_blocking_duration_secs': 50.85839653015137, 'get_old_steps_start_time': 1776667955.8244877, 'get_old_steps_duration_secs': 1.9311904907226562e-05, 'checkpoint_manager_blocking_start_time': 1776667904.962492, 'checkpoint_manager_blocking_duration_secs': 50.86619758605957} I0420 06:52:35.828803 133206972139328 checkpointing.py:410] Saved a checkpoint at step 9. I0420 06:52:35.828834 133206972139328 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 06:52:35.828863 133206972139328 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 06:52:35.829562 133206972139328 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.226, Tokens/s/device: 13901.239, total_weights: 65536, loss: 7.181, lm_loss: 7.181, perplexity: 1314.495 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Mon Apr 20 06:52:46 UTC 2026 EXIT_CODE=0