XPK Start: Wed Apr 22 14:55:14 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-22 14:55:38.902153: 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) I0422 14:55:39.434788 133917151811392 max_utils.py:273] Attempting to initialize the jax distributed system... I0422 14:55:48.476286 133917151811392 distributed.py:149] Starting JAX distributed service on [::]:8482 I0422 14:55:48.478805 133917151811392 distributed.py:172] Connecting to JAX distributed service on mt-13-scan-layers-true-9dvuj-slice-job-0-0.mt-13-scan-layers-true-9dvuj:8482 I0422 14:55:49.828562 133917151811392 max_utils.py:284] Jax distributed system initialized! I0422 14:55:56.113447 133917151811392 max_utils.py:800] System Information: Jax Version: 0.9.2 I0422 14:55:56.113548 133917151811392 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0422 14:55:56.113593 133917151811392 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 I0422 14:55:56.113625 133917151811392 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0422 14:55:56.814498 133917151811392 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0422 14:55:56.929872 133917151811392 checkpointing.py:688] Setting up checkpoint logger... I0422 14:55:56.929988 133917151811392 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0422 14:55:56.930034 133917151811392 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0422 14:55:56.930268 133917151811392 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 0x79cb6fd1b7d0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0422 14:55:59.772729 133917151811392 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0422 14:55:59.772961 133917151811392 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 0x79ca40bc1af0>}, handler_registry=None I0422 14:55:59.773218 133917151811392 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79ca40bc1af0>` 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`. I0422 14:55:59.773267 133917151811392 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79b6b028e780>` 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`. I0422 14:55:59.773302 133917151811392 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 0x79ca40bc1af0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79ca40bc1af0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79b6b028e780>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79b6b028e780>}). I0422 14:55:59.773629 133917151811392 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0422 14:55:59.773697 133917151811392 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x79b6b05a19e0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0422 14:56:01.061362 133917151811392 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints I0422 14:56:01.081974 133917151811392 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/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x79b6b0782e40> I0422 14:56:01.082117 133917151811392 checkpointing.py:302] Checkpoint manager created! I0422 14:56:02.056081 133917151811392 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0422 14:56:02.056212 133917151811392 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0422 14:56:03.421508 133917151811392 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0422 14:56:03.421625 133917151811392 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0422 14:56:03.421677 133917151811392 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0422 14:56:03.421721 133917151811392 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0422 14:56:03.421759 133917151811392 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0422 14:56:03.421795 133917151811392 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0422 14:56:03.421830 133917151811392 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0422 14:56:03.421865 133917151811392 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0422 14:56:03.421899 133917151811392 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0422 14:56:03.421931 133917151811392 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0422 14:56:03.421963 133917151811392 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0422 14:56:03.421995 133917151811392 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0422 14:56:03.825175 133917151811392 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0422 14:56:03.825267 133917151811392 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0422 14:56:03.830755 133917151811392 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0422 14:56:03.830810 133917151811392 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0422 14:56:03.847384 133917151811392 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0422 14:56:03.847446 133917151811392 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0422 14:56:03.863311 133917151811392 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0422 14:56:03.863373 133917151811392 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0422 14:56:03.887450 133917151811392 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0422 14:56:03.887519 133917151811392 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0422 14:56:03.903582 133917151811392 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0422 14:56:03.903645 133917151811392 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0422 14:56:03.919539 133917151811392 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0422 14:56:03.919605 133917151811392 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0422 14:56:03.950345 133917151811392 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0422 14:56:03.950422 133917151811392 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0422 14:56:03.970715 133917151811392 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0422 14:56:03.970780 133917151811392 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0422 14:56:15.193404 133917151811392 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. I0422 14:56:15.195773 133917151811392 metric_logger.py:301] number parameters: 1.104 billion I0422 14:56:26.692065 133917151811392 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0422 14:56:26.844428 133917151811392 checkpointing.py:798] Waited 0.15234875679016113 seconds for step 0 to finish before starting checkpointing. I0422 14:56:26.846766 133917151811392 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0422 14:56:26.848480 133917151811392 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0 I0422 14:56:26.850371 133917151811392 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints/0. I0422 14:56:27.146421 133917151811392 signaling_client.py:364] Using JaxDistributedSignalingClient I0422 14:56:27.147434 133917151811392 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0422 14:56:27.147491 133917151811392 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 I0422 14:56:27.420163 133917151811392 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.274525s I0422 14:56:27.420345 133917151811392 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.440 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2835686206817627 s) (per-host) I0422 14:56:27.420405 133917151811392 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.283642s (batch_requests_ready=0.002965s, total_serialization_initiated=0.280596s, others=0.000080s) I0422 14:56:27.420525 133917151811392 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.287945s (all_items=0.000017s, per_item={'items': '0.00001740'}, temp_paths=0.287928) I0422 14:56:27.421332 133917151811392 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.57 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints/0. I0422 14:56:27.421667 133789030463232 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-22 15:16:27.421631 I0422 14:56:27.432142 133917151811392 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0422 14:56:27.432438 133787425961728 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0422 14:56:27.432596 133917151811392 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776869786.8467479, 'wait_for_prev_duration_secs': 6.532669067382812e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776869786.848568, 'checkpointer_blocking_duration_secs': 0.5731983184814453, 'get_old_steps_start_time': 1776869787.4217916, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776869786.844823, 'checkpoint_manager_blocking_duration_secs': 0.5877344608306885} I0422 14:56:27.432704 133917151811392 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0422 14:56:27.432774 133917151811392 max_utils.py:750] Memstats: After params initialized: I0422 14:56:27.432822 133917151811392 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0422 14:56:27.432853 133917151811392 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0422 14:56:27.432879 133917151811392 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0422 14:56:27.432903 133917151811392 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0422 14:56:27.752846 133917151811392 metric_logger.py:196] completed step: 0, seconds: 11.495, TFLOP/s/device: 1.182, Tokens/s/device: 178.161, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0422 14:56:27.920871 133917151811392 metric_logger.py:196] completed step: 1, seconds: 1.059, TFLOP/s/device: 12.834, Tokens/s/device: 1934.406, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0422 14:56:28.334947 133917151811392 metric_logger.py:196] completed step: 2, seconds: 0.022, TFLOP/s/device: 623.148, Tokens/s/device: 93927.720, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0422 14:56:28.482553 133917151811392 metric_logger.py:196] completed step: 3, seconds: 0.404, TFLOP/s/device: 33.624, Tokens/s/device: 5068.128, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0422 14:56:28.778638 133917151811392 metric_logger.py:196] completed step: 4, seconds: 0.164, TFLOP/s/device: 82.608, Tokens/s/device: 12451.513, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0422 14:56:28.786363 133917151811392 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.336, Tokens/s/device: 13917.960, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0422 14:56:30.512953 2796 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0422 14:56:32.983187 133787907831552 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints/0/items/array_metadatas/process_6 I0422 14:56:51.586281 133917151811392 metric_logger.py:196] completed step: 6, seconds: 0.297, TFLOP/s/device: 45.769, Tokens/s/device: 6898.735, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0422 14:56:51.733942 133917151811392 metric_logger.py:196] completed step: 7, seconds: 22.655, TFLOP/s/device: 0.600, Tokens/s/device: 90.399, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0422 14:56:51.881557 133917151811392 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.273, Tokens/s/device: 13456.156, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0422 14:56:52.029784 133917151811392 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0422 14:56:52.030467 133917151811392 checkpointing.py:798] Waited 0.0006959438323974609 seconds for step 9 to finish before starting checkpointing. I0422 14:56:52.032476 133917151811392 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0422 14:57:04.982787 133789030463232 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 41.737 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.84598755836487 s) (per-host) I0422 14:57:04.982891 133789030463232 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.560592s. I0422 14:57:13.388537 133789030463232 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 45.966220s. I0422 14:57:13.388828 133787425961728 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0422 14:57:13.388948 133787425961728 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0422 14:57:13.388997 133787425961728 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0422 14:57:13.390951 133787425961728 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0422 14:57:13.391151 133917151811392 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. W0422 14:57:13.391290 133917151811392 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.358808 seconds. If this number is high, consider checkpointing less frequently. I0422 14:57:13.393187 133917151811392 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 9 I0422 14:57:13.395278 133917151811392 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints/9. I0422 14:57:14.136230 133917151811392 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0422 14:57:14.136322 133917151811392 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 I0422 14:57:14.174308 133917151811392 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.039684s I0422 14:57:14.174490 133917151811392 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 32.943 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04682564735412598 s) (per-host) I0422 14:57:14.174545 133917151811392 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046897s (batch_requests_ready=0.002652s, total_serialization_initiated=0.044166s, others=0.000079s) I0422 14:57:14.174643 133917151811392 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.051153s (all_items=0.000024s, per_item={'items': '0.00002408'}, temp_paths=0.051129) I0422 14:57:14.175348 133917151811392 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.78 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints/9. I0422 14:57:14.175638 133766253098752 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-22 15:17:14.175605 I0422 14:57:14.177572 133917151811392 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0422 14:57:14.177823 133787425961728 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0422 14:57:14.177956 133917151811392 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776869812.0324445, 'wait_for_prev_duration_secs': 21.35880756378174, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776869833.393226, 'checkpointer_blocking_duration_secs': 0.7825522422790527, 'get_old_steps_start_time': 1776869834.1758025, 'get_old_steps_duration_secs': 2.9087066650390625e-05, 'checkpoint_manager_blocking_start_time': 1776869812.030709, 'checkpoint_manager_blocking_duration_secs': 22.147212266921997} I0422 14:57:14.178123 133917151811392 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0422 14:57:14.178171 133917151811392 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0422 14:57:19.298566 133787907831552 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260422_123906/nnx_xpk_feat_nnx_post_train_fixes_20260422_123906_13_scan_layers_true/checkpoints/9/items/array_metadatas/process_6 I0422 14:57:56.447240 133766253098752 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.325 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.319544315338135 s) (per-host) I0422 14:57:56.447373 133766253098752 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.271632s. I0422 14:58:03.976234 133766253098752 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 49.800477s. I0422 14:58:03.976635 133787425961728 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0422 14:58:03.976772 133787425961728 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0422 14:58:03.976826 133787425961728 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0422 14:58:03.978232 133787425961728 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0422 14:58:03.978404 133917151811392 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. I0422 14:58:03.978579 133917151811392 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0422 14:58:03.979536 133917151811392 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.809, Tokens/s/device: 13838.399, total_weights: 65536, loss: 8.175, lm_loss: 8.175, perplexity: 3551.438 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Wed Apr 22 14:58:15 UTC 2026 EXIT_CODE=0