XPK Start: Mon Apr 20 17:41:15 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 17:41:39.812939: 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 17:41:39.994723 138993608660800 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 17:41:49.037034 138993608660800 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 17:41:49.039343 138993608660800 distributed.py:172] Connecting to JAX distributed service on mt-04-int8-1q65q-slice-job-0-0.mt-04-int8-1q65q:8482 I0420 17:41:50.709883 138993608660800 max_utils.py:284] Jax distributed system initialized! I0420 17:41:57.000005 138993608660800 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 17:41:57.000105 138993608660800 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 17:41:57.000146 138993608660800 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 17:41:57.000180 138993608660800 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 17:41:57.694519 138993608660800 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 17:41:58.244336 138993608660800 checkpointing.py:688] Setting up checkpoint logger... I0420 17:41:58.244453 138993608660800 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 17:41:58.244498 138993608660800 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 17:41:58.244727 138993608660800 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 0x7e6940e50410>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 17:42:01.084997 138993608660800 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 17:42:01.085223 138993608660800 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 0x7e540c686000>}, handler_registry=None I0420 17:42:01.085459 138993608660800 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e540c686000>` 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 17:42:01.085508 138993608660800 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e540c6a9970>` 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 17:42:01.085543 138993608660800 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 0x7e540c686000>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e540c686000>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e540c6a9970>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e540c6a9970>}). I0420 17:42:01.085904 138993608660800 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 17:42:01.085976 138993608660800 async_checkpointer.py:192] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e540c1151c0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 17:42:02.267416 138993608660800 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_04_int8/checkpoints I0420 17:42:02.754380 138993608660800 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_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e540c69c2f0> I0420 17:42:02.754553 138993608660800 checkpointing.py:302] Checkpoint manager created! I0420 17:42:04.127649 138993608660800 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 17:42:04.127777 138993608660800 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 17:42:06.465894 138993608660800 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0420 17:42:06.466007 138993608660800 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 17:42:06.466058 138993608660800 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 17:42:06.466109 138993608660800 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0420 17:42:06.466148 138993608660800 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 17:42:06.466183 138993608660800 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 17:42:06.466219 138993608660800 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:42:06.466272 138993608660800 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0420 17:42:06.466322 138993608660800 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:42:06.466359 138993608660800 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:42:06.466392 138993608660800 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0420 17:42:06.466425 138993608660800 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0420 17:42:06.878256 138993608660800 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 17:42:06.878347 138993608660800 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:42:06.883439 138993608660800 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 17:42:06.883495 138993608660800 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:42:06.899819 138993608660800 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 17:42:06.899877 138993608660800 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:42:06.915447 138993608660800 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 17:42:06.915508 138993608660800 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:42:06.996439 138993608660800 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 17:42:06.996534 138993608660800 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:42:07.012346 138993608660800 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 17:42:07.012410 138993608660800 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:42:07.028081 138993608660800 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 17:42:07.028142 138993608660800 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:42:07.057914 138993608660800 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 17:42:07.057985 138993608660800 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:42:07.543812 138993608660800 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 17:42:07.543903 138993608660800 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 17:42:21.612354 138993608660800 max_utils.py:791] Total memory size: 1.8 GB, Output size: 0.4 GB, Temp size: 1.4 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0420 17:42:21.616015 138993608660800 metric_logger.py:301] number parameters: 1.104 billion I0420 17:42:36.341220 138993608660800 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 17:42:36.580647 138993608660800 checkpointing.py:798] Waited 0.2394113540649414 seconds for step 0 to finish before starting checkpointing. I0420 17:42:36.583701 138993608660800 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 17:42:36.585907 138993608660800 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 0 I0420 17:42:36.589258 138993608660800 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_04_int8/checkpoints/0. I0420 17:42:36.971962 138993608660800 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 17:42:36.972990 138993608660800 jax_array_handlers.py:360] Scheduling D2H of 111 prioritized jax.Array. I0420 17:42:36.973051 138993608660800 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 17:42:37.252180 138993608660800 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.281882s I0420 17:42:37.252354 138993608660800 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 5.202 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29651498794555664 s) (per-host) I0420 17:42:37.252408 138993608660800 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.296578s (batch_requests_ready=0.004608s, total_serialization_initiated=0.291900s, others=0.000070s) I0420 17:42:37.252524 138993608660800 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.300728s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.300710) I0420 17:42:37.253358 138993608660800 event_tracking.py:125] [process=1] [async] Finished blocking save in 0.67 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_04_int8/checkpoints/0. I0420 17:42:37.253646 138860957460224 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 18:02:37.253623 I0420 17:42:37.259906 138993608660800 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 17:42:37.260174 138860453426944 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0420 17:42:37.260297 138993608660800 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_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776706956.5836828, 'wait_for_prev_duration_secs': 5.9604644775390625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776706956.5859473, 'checkpointer_blocking_duration_secs': 0.6678225994110107, 'get_old_steps_start_time': 1776706957.2537959, 'get_old_steps_duration_secs': 2.9087066650390625e-05, 'checkpoint_manager_blocking_start_time': 1776706956.5811102, 'checkpoint_manager_blocking_duration_secs': 0.6791467666625977} I0420 17:42:37.260412 138993608660800 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 17:42:37.260493 138993608660800 max_utils.py:750] Memstats: After params initialized: I0420 17:42:37.260543 138993608660800 max_utils.py:756] Using (GB) 0.44 / 31.25 (1.408000%) on TPU_2(process=1,(2,0,0,0)) I0420 17:42:37.260577 138993608660800 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0420 17:42:37.260611 138993608660800 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0420 17:42:37.260637 138993608660800 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0420 17:42:37.591830 138993608660800 metric_logger.py:196] completed step: 0, seconds: 14.723, TFLOP/s/device: 0.923, Tokens/s/device: 139.099, total_weights: 65536, loss: 10.872, lm_loss: 10.872, perplexity: 52668.902 I0420 17:42:37.836906 138993608660800 metric_logger.py:196] completed step: 1, seconds: 1.248, TFLOP/s/device: 10.885, Tokens/s/device: 1640.721, total_weights: 65536, loss: 10.872, lm_loss: 10.872, perplexity: 52668.902 I0420 17:42:38.294351 138993608660800 metric_logger.py:196] completed step: 2, seconds: 0.019, TFLOP/s/device: 733.211, Tokens/s/device: 110517.511, total_weights: 65536, loss: 10.260, lm_loss: 10.260, perplexity: 28557.658 I0420 17:42:38.523890 138993608660800 metric_logger.py:196] completed step: 3, seconds: 0.437, TFLOP/s/device: 31.110, Tokens/s/device: 4689.246, total_weights: 65536, loss: 9.728, lm_loss: 9.728, perplexity: 16789.145 I0420 17:42:38.984357 138993608660800 metric_logger.py:196] completed step: 4, seconds: 0.257, TFLOP/s/device: 52.842, Tokens/s/device: 7964.905, total_weights: 65536, loss: 9.271, lm_loss: 9.271, perplexity: 10625.563 I0420 17:42:38.993219 138993608660800 metric_logger.py:196] completed step: 5, seconds: 0.229, TFLOP/s/device: 59.297, Tokens/s/device: 8937.845, total_weights: 65536, loss: 8.885, lm_loss: 8.885, perplexity: 7225.917 I0420 17:42:40.969293 2987 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 17:42:43.019068 138860935063296 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 111 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_04_int8/checkpoints/0/items/array_metadatas/process_1 I0420 17:43:07.332400 138993608660800 metric_logger.py:196] completed step: 6, seconds: 0.461, TFLOP/s/device: 29.484, Tokens/s/device: 4444.203, total_weights: 65536, loss: 8.586, lm_loss: 8.586, perplexity: 5354.806 I0420 17:43:07.562688 138993608660800 metric_logger.py:196] completed step: 7, seconds: 28.112, TFLOP/s/device: 0.483, Tokens/s/device: 72.851, total_weights: 65536, loss: 8.378, lm_loss: 8.378, perplexity: 4350.756 I0420 17:43:07.792060 138993608660800 metric_logger.py:196] completed step: 8, seconds: 0.236, TFLOP/s/device: 57.520, Tokens/s/device: 8669.994, total_weights: 65536, loss: 8.249, lm_loss: 8.249, perplexity: 3824.619 I0420 17:43:08.023131 138993608660800 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 17:43:08.024085 138993608660800 checkpointing.py:798] Waited 0.0009648799896240234 seconds for step 9 to finish before starting checkpointing. I0420 17:43:08.026078 138993608660800 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 17:43:11.064019 138860957460224 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 46.311 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 34.10814189910889 s) (per-host) I0420 17:43:11.064145 138860957460224 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 33.810406s. I0420 17:43:20.473430 138860957460224 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 43.219675s. I0420 17:43:20.473651 138860453426944 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 17:43:20.473733 138860453426944 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0420 17:43:20.473795 138860453426944 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 17:43:20.475547 138860453426944 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 17:43:20.475751 138993608660800 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 17:43:20.475894 138993608660800 checkpoint_manager.py:1452] Waiting for previous save to complete took 12.449813 seconds. If this number is high, consider checkpointing less frequently. I0420 17:43:20.477818 138993608660800 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 9 I0420 17:43:20.480010 138993608660800 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_04_int8/checkpoints/9. I0420 17:43:21.212307 138993608660800 jax_array_handlers.py:360] Scheduling D2H of 111 prioritized jax.Array. I0420 17:43:21.212409 138993608660800 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 17:43:21.245274 138993608660800 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.035482s I0420 17:43:21.245447 138993608660800 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 32.498 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04746723175048828 s) (per-host) I0420 17:43:21.245499 138993608660800 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.047529s (batch_requests_ready=0.004232s, total_serialization_initiated=0.043230s, others=0.000068s) I0420 17:43:21.245616 138993608660800 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.051926s (all_items=0.000014s, per_item={'items': '0.00001431'}, temp_paths=0.051912) I0420 17:43:21.246367 138993608660800 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_04_int8/checkpoints/9. I0420 17:43:21.246721 138860453426944 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 18:03:21.246684 I0420 17:43:21.250063 138993608660800 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 17:43:21.250320 138860935063296 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0420 17:43:21.250488 138993608660800 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_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776706988.02605, 'wait_for_prev_duration_secs': 12.44981336593628, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776707000.4778664, 'checkpointer_blocking_duration_secs': 0.7689986228942871, 'get_old_steps_start_time': 1776707001.2468905, 'get_old_steps_duration_secs': 3.218650817871094e-05, 'checkpoint_manager_blocking_start_time': 1776706988.0243587, 'checkpoint_manager_blocking_duration_secs': 13.226092338562012} I0420 17:43:21.250631 138993608660800 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 17:43:21.250706 138993608660800 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 17:43:27.311068 138837560878848 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 111 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_04_int8/checkpoints/9/items/array_metadatas/process_1 I0420 17:44:03.472497 138860453426944 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 37.365 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.27447271347046 s) (per-host) I0420 17:44:03.472624 138860453426944 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.225791s. I0420 17:44:12.763243 138860453426944 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 51.516395s. I0420 17:44:12.763518 138860935063296 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 17:44:12.763635 138860935063296 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0420 17:44:12.763705 138860935063296 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 17:44:12.765337 138860935063296 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 17:44:12.765533 138993608660800 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 17:44:12.765744 138993608660800 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 17:44:12.766853 138993608660800 metric_logger.py:196] completed step: 9, seconds: 0.230, TFLOP/s/device: 59.158, Tokens/s/device: 8916.870, total_weights: 65536, loss: 8.174, lm_loss: 8.174, perplexity: 3546.104 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Mon Apr 20 17:44:25 UTC 2026 EXIT_CODE=0