XPK Start: Mon Apr 20 18:13:10 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 18:13:35.045051: 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 18:13:35.224523 134785500489536 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 18:13:44.266530 134785500489536 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 18:13:44.268842 134785500489536 distributed.py:172] Connecting to JAX distributed service on mt-13-scan-layers-true-cxzct-slice-job-0-0.mt-13-scan-layers-true-cxzct:8482 I0420 18:13:45.538642 134785500489536 max_utils.py:284] Jax distributed system initialized! I0420 18:13:50.791070 134785500489536 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 18:13:50.791169 134785500489536 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 18:13:50.791209 134785500489536 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 18:13:50.791243 134785500489536 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 18:13:51.848188 134785500489536 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 18:13:51.960766 134785500489536 checkpointing.py:688] Setting up checkpoint logger... I0420 18:13:51.960879 134785500489536 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 18:13:51.960925 134785500489536 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 18:13:51.961123 134785500489536 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 0x7a957aa0a6c0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 18:13:54.530790 134785500489536 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 18:13:54.531022 134785500489536 checkpoint_manager.py:708] [process=1][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a947073d8e0>}, handler_registry=None I0420 18:13:54.531257 134785500489536 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a947073d8e0>` 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 18:13:54.531306 134785500489536 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a946e755ca0>` 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 18:13:54.531342 134785500489536 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 0x7a947073d8e0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a947073d8e0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a946e755ca0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a946e755ca0>}). I0420 18:13:54.531676 134785500489536 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 18:13:54.531755 134785500489536 async_checkpointer.py:192] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7a81e03a84a0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 18:13:55.721207 134785500489536 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints I0420 18:13:55.723477 134785500489536 checkpoint_manager.py:929] [process=1][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_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7a946e753860> I0420 18:13:55.723593 134785500489536 checkpointing.py:302] Checkpoint manager created! I0420 18:13:56.683618 134785500489536 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 18:13:56.683744 134785500489536 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 18:13:58.066210 134785500489536 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0420 18:13:58.066324 134785500489536 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 18:13:58.066375 134785500489536 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 18:13:58.066417 134785500489536 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0420 18:13:58.066456 134785500489536 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 18:13:58.066490 134785500489536 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 18:13:58.066525 134785500489536 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 18:13:58.066564 134785500489536 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0420 18:13:58.066599 134785500489536 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 18:13:58.066632 134785500489536 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 18:13:58.066674 134785500489536 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0420 18:13:58.066708 134785500489536 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0420 18:13:58.466603 134785500489536 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 18:13:58.466700 134785500489536 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 18:13:58.472677 134785500489536 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 18:13:58.472731 134785500489536 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 18:13:58.489124 134785500489536 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 18:13:58.489187 134785500489536 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 18:13:58.504556 134785500489536 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 18:13:58.504617 134785500489536 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 18:13:58.528107 134785500489536 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 18:13:58.528186 134785500489536 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 18:13:58.543775 134785500489536 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 18:13:58.543834 134785500489536 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 18:13:58.559256 134785500489536 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 18:13:58.559315 134785500489536 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 18:13:58.588776 134785500489536 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 18:13:58.588849 134785500489536 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 18:13:58.608546 134785500489536 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 18:13:58.608611 134785500489536 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 18:14:09.802672 134785500489536 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 18:14:09.804921 134785500489536 metric_logger.py:301] number parameters: 1.104 billion I0420 18:14:21.084470 134785500489536 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 18:14:21.236510 134785500489536 checkpointing.py:798] Waited 0.1520249843597412 seconds for step 0 to finish before starting checkpointing. I0420 18:14:21.238742 134785500489536 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 18:14:21.240430 134785500489536 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 0 I0420 18:14:21.241887 134785500489536 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints/0. I0420 18:14:21.544367 134785500489536 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 18:14:21.545321 134785500489536 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 18:14:21.545377 134785500489536 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 18:14:21.820289 134785500489536 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.276694s I0420 18:14:21.820458 134785500489536 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 5.395 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2859053611755371 s) (per-host) I0420 18:14:21.820511 134785500489536 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.285968s (batch_requests_ready=0.003207s, total_serialization_initiated=0.282690s, others=0.000071s) I0420 18:14:21.820611 134785500489536 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.290147s (all_items=0.000018s, per_item={'items': '0.00001812'}, temp_paths=0.290129) I0420 18:14:21.821446 134785500489536 event_tracking.py:125] [process=1] [async] Finished blocking save in 0.58 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints/0. I0420 18:14:21.821793 134659639867136 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 18:34:21.821756 I0420 18:14:21.835939 134785500489536 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 18:14:21.836217 134657974712064 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0420 18:14:21.836375 134785500489536 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776708861.2387226, 'wait_for_prev_duration_secs': 5.984306335449219e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776708861.240468, 'checkpointer_blocking_duration_secs': 0.5814821720123291, 'get_old_steps_start_time': 1776708861.821977, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776708861.2369215, 'checkpoint_manager_blocking_duration_secs': 0.5994153022766113} I0420 18:14:21.836481 134785500489536 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 18:14:21.836555 134785500489536 max_utils.py:750] Memstats: After params initialized: I0420 18:14:21.836605 134785500489536 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0420 18:14:21.836637 134785500489536 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0420 18:14:21.836680 134785500489536 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0420 18:14:21.836707 134785500489536 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0420 18:14:22.151036 134785500489536 metric_logger.py:196] completed step: 0, seconds: 11.278, TFLOP/s/device: 1.205, Tokens/s/device: 181.585, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 18:14:22.334081 134785500489536 metric_logger.py:196] completed step: 1, seconds: 1.065, TFLOP/s/device: 12.762, Tokens/s/device: 1923.700, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 18:14:22.768148 134785500489536 metric_logger.py:196] completed step: 2, seconds: 0.037, TFLOP/s/device: 369.336, Tokens/s/device: 55670.327, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0420 18:14:22.915775 134785500489536 metric_logger.py:196] completed step: 3, seconds: 0.424, TFLOP/s/device: 32.056, Tokens/s/device: 4831.784, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0420 18:14:23.211793 134785500489536 metric_logger.py:196] completed step: 4, seconds: 0.165, TFLOP/s/device: 82.552, Tokens/s/device: 12443.191, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0420 18:14:23.219612 134785500489536 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.252, Tokens/s/device: 13905.297, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0420 18:14:24.996233 2743 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 18:14:27.176429 134658023642880 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints/0/items/array_metadatas/process_1 I0420 18:14:45.309789 134785500489536 metric_logger.py:196] completed step: 6, seconds: 0.297, TFLOP/s/device: 45.768, Tokens/s/device: 6898.596, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0420 18:14:45.457198 134785500489536 metric_logger.py:196] completed step: 7, seconds: 21.944, TFLOP/s/device: 0.619, Tokens/s/device: 93.329, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0420 18:14:45.604869 134785500489536 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.608, Tokens/s/device: 13355.941, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0420 18:14:45.753132 134785500489536 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 18:14:45.753802 134785500489536 checkpointing.py:798] Waited 0.0006814002990722656 seconds for step 9 to finish before starting checkpointing. I0420 18:14:45.755909 134785500489536 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 18:14:58.945167 134659639867136 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 42.223 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.410579681396484 s) (per-host) I0420 18:14:58.945271 134659639867136 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.123361s. I0420 18:15:06.611228 134659639867136 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 44.789301s. I0420 18:15:06.611529 134657974712064 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 18:15:06.611645 134657974712064 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0420 18:15:06.611716 134657974712064 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 18:15:06.613131 134657974712064 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 18:15:06.613321 134785500489536 checkpoint_manager.py:2032] [process=1][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0420 18:15:06.613459 134785500489536 checkpoint_manager.py:1452] Waiting for previous save to complete took 20.857547 seconds. If this number is high, consider checkpointing less frequently. I0420 18:15:06.615165 134785500489536 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 9 I0420 18:15:06.617330 134785500489536 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints/9. I0420 18:15:07.346182 134785500489536 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 18:15:07.346276 134785500489536 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 18:15:07.382972 134785500489536 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.038348s I0420 18:15:07.383142 134785500489536 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 33.821 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04560971260070801 s) (per-host) I0420 18:15:07.383194 134785500489536 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045670s (batch_requests_ready=0.002902s, total_serialization_initiated=0.042699s, others=0.000068s) I0420 18:15:07.383289 134785500489536 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.049879s (all_items=0.000016s, per_item={'items': '0.00001645'}, temp_paths=0.049862) I0420 18:15:07.383954 134785500489536 event_tracking.py:125] [process=1] [async] Finished blocking save in 0.77 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints/9. I0420 18:15:07.384285 134657974712064 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 18:35:07.384248 I0420 18:15:07.386271 134785500489536 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 18:15:07.386482 134655830599424 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0420 18:15:07.386598 134785500489536 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776708885.7558804, 'wait_for_prev_duration_secs': 20.857547283172607, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776708906.6152053, 'checkpointer_blocking_duration_secs': 0.7692258358001709, 'get_old_steps_start_time': 1776708907.3844554, 'get_old_steps_duration_secs': 2.8848648071289062e-05, 'checkpoint_manager_blocking_start_time': 1776708885.7540357, 'checkpoint_manager_blocking_duration_secs': 21.632529735565186} I0420 18:15:07.386730 134785500489536 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 18:15:07.386779 134785500489536 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 18:15:12.647737 134658023642880 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_13_scan_layers_true/checkpoints/9/items/array_metadatas/process_1 I0420 18:15:49.841753 134657974712064 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 37.163 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.50418186187744 s) (per-host) I0420 18:15:49.841876 134657974712064 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.457480s. I0420 18:15:58.375293 134657974712064 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 50.990882s. I0420 18:15:58.375559 134655830599424 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 18:15:58.375614 134655830599424 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0420 18:15:58.375666 134655830599424 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 18:15:58.377549 134655830599424 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 18:15:58.377725 134785500489536 checkpoint_manager.py:2032] [process=1][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 18:15:58.377901 134785500489536 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 18:15:58.379005 134785500489536 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.007, Tokens/s/device: 13868.292, 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: Mon Apr 20 18:16:07 UTC 2026 EXIT_CODE=0