XPK Start: Fri Apr 17 06:28:01 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-17 06:28:25.574679: 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) I0417 06:28:25.752333 140318360377152 max_utils.py:273] Attempting to initialize the jax distributed system... I0417 06:28:34.794018 140318360377152 distributed.py:149] Starting JAX distributed service on [::]:8482 I0417 06:28:34.796305 140318360377152 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-false-sv-h7yoa-slice-job-0-0.mt-16-zarr3-false-sv-h7yoa:8482 I0417 06:28:35.933259 140318360377152 max_utils.py:284] Jax distributed system initialized! I0417 06:28:41.993494 140318360377152 max_utils.py:800] System Information: Jax Version: 0.9.2 I0417 06:28:41.993597 140318360377152 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0417 06:28:41.993638 140318360377152 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 I0417 06:28:41.993672 140318360377152 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0417 06:28:42.678022 140318360377152 maxtext_utils.py:1687] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0417 06:28:42.789613 140318360377152 checkpointing.py:688] Setting up checkpoint logger... I0417 06:28:42.789728 140318360377152 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=False I0417 06:28:42.789774 140318360377152 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0417 06:28:42.789983 140318360377152 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=False, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7f9db264f590>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0417 06:28:45.702986 140318360377152 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0417 06:28:45.703219 140318360377152 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 0x7f898c724fe0>}, handler_registry=None I0417 06:28:45.703460 140318360377152 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f898c724fe0>` 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`. I0417 06:28:45.703512 140318360377152 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f898c40fcb0>` 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`. I0417 06:28:45.703549 140318360377152 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 0x7f898c724fe0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f898c724fe0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f898c40fcb0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f898c40fcb0>}). I0417 06:28:45.703921 140318360377152 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0417 06:28:45.704008 140318360377152 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7f898c482020> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0417 06:28:47.268320 140318360377152 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints I0417 06:28:47.865753 140318360377152 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=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/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f898c401d00> I0417 06:28:47.865974 140318360377152 checkpointing.py:302] Checkpoint manager created! I0417 06:28:48.831269 140318360377152 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0417 06:28:48.831395 140318360377152 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0417 06:28:50.230554 140318360377152 maxtext_utils.py:1805] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0417 06:28:50.230673 140318360377152 maxtext_utils.py:1805] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0417 06:28:50.230727 140318360377152 maxtext_utils.py:1805] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0417 06:28:50.230769 140318360377152 maxtext_utils.py:1805] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0417 06:28:50.230806 140318360377152 maxtext_utils.py:1805] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0417 06:28:50.230852 140318360377152 maxtext_utils.py:1805] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0417 06:28:50.230889 140318360377152 maxtext_utils.py:1805] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0417 06:28:50.230925 140318360377152 maxtext_utils.py:1805] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0417 06:28:50.230958 140318360377152 maxtext_utils.py:1805] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0417 06:28:50.230989 140318360377152 maxtext_utils.py:1805] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0417 06:28:50.231020 140318360377152 maxtext_utils.py:1805] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0417 06:28:50.231050 140318360377152 maxtext_utils.py:1805] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0417 06:28:50.633688 140318360377152 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0417 06:28:50.633776 140318360377152 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 06:28:50.639209 140318360377152 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0417 06:28:50.639266 140318360377152 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 06:28:50.655723 140318360377152 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 06:28:50.655781 140318360377152 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 06:28:50.671662 140318360377152 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 06:28:50.671720 140318360377152 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 06:28:50.695723 140318360377152 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 06:28:50.695791 140318360377152 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 06:28:50.711931 140318360377152 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 06:28:50.712000 140318360377152 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 06:28:50.727763 140318360377152 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 06:28:50.727838 140318360377152 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 06:28:50.757674 140318360377152 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0417 06:28:50.757742 140318360377152 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 06:28:50.777623 140318360377152 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0417 06:28:50.777692 140318360377152 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0417 06:29:01.418055 140318360377152 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. I0417 06:29:01.420423 140318360377152 metric_logger.py:289] number parameters: 1.104 billion I0417 06:29:12.561446 140318360377152 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0417 06:29:12.717893 140318360377152 checkpointing.py:798] Waited 0.15642213821411133 seconds for step 0 to finish before starting checkpointing. I0417 06:29:12.720700 140318360377152 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 06:29:12.723505 140318360377152 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0 I0417 06:29:12.725181 140318360377152 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/0. I0417 06:29:13.447679 140318360377152 signaling_client.py:364] Using JaxDistributedSignalingClient I0417 06:29:13.448760 140318360377152 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0417 06:29:13.448839 140318360377152 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 I0417 06:29:13.725510 140318360377152 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.278589s I0417 06:29:13.725698 140318360377152 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.362 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28766345977783203 s) (per-host) I0417 06:29:13.725756 140318360377152 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.287732s (batch_requests_ready=0.002975s, total_serialization_initiated=0.284681s, others=0.000075s) I0417 06:29:13.725871 140318360377152 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.291891s (all_items=0.000019s, per_item={'items': '0.00001907'}, temp_paths=0.291872) I0417 06:29:13.726714 140318360377152 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.00 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/0. I0417 06:29:13.727026 140190703073024 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 06:49:13.726992 I0417 06:29:13.735206 140318360377152 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0417 06:29:13.735480 140187531212544 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0417 06:29:13.735620 140318360377152 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776407352.7206812, 'wait_for_prev_duration_secs': 6.079673767089844e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776407352.7235446, 'checkpointer_blocking_duration_secs': 1.0036406517028809, 'get_old_steps_start_time': 1776407353.7272115, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776407352.7182827, 'checkpoint_manager_blocking_duration_secs': 1.0172955989837646} I0417 06:29:13.735732 140318360377152 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0417 06:29:13.735801 140318360377152 max_utils.py:750] Memstats: After params initialized: I0417 06:29:13.735868 140318360377152 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0417 06:29:13.735901 140318360377152 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0417 06:29:13.735928 140318360377152 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0417 06:29:13.735952 140318360377152 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0417 06:29:14.049388 140318360377152 metric_logger.py:185] completed step: 0, seconds: 11.140, TFLOP/s/device: 1.220, Tokens/s/device: 183.842, total_weights: 65536, loss: 10.874 I0417 06:29:14.221969 140318360377152 metric_logger.py:185] completed step: 1, seconds: 1.486, TFLOP/s/device: 9.142, Tokens/s/device: 1377.965, total_weights: 65536, loss: 10.874 I0417 06:29:14.656865 140318360377152 metric_logger.py:185] completed step: 2, seconds: 0.026, TFLOP/s/device: 517.053, Tokens/s/device: 77935.916, total_weights: 65536, loss: 10.560 I0417 06:29:14.804456 140318360377152 metric_logger.py:185] completed step: 3, seconds: 0.425, TFLOP/s/device: 31.998, Tokens/s/device: 4823.147, total_weights: 65536, loss: 9.979 I0417 06:29:14.810219 140318360377152 checkpointing.py:794] Waiting for step 5 to finish before checkpoint... I0417 06:29:15.099653 140318360377152 checkpointing.py:798] Waited 0.28940510749816895 seconds for step 5 to finish before starting checkpointing. I0417 06:29:15.102503 140318360377152 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 06:29:17.416410 2782 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0417 06:29:19.425412 140189083768576 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_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/0/items/array_metadatas/process_6 I0417 06:29:55.195607 140190703073024 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.828 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.75754451751709 s) (per-host) I0417 06:29:55.195723 140190703073024 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.468582s. I0417 06:30:03.472015 140190703073024 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 49.744858s. I0417 06:30:03.472235 140187531212544 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 06:30:03.472311 140187531212544 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0417 06:30:03.472363 140187531212544 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0417 06:30:03.474020 140187531212544 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0417 06:30:03.474173 140318360377152 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. W0417 06:30:03.474308 140318360377152 checkpoint_manager.py:1452] Waiting for previous save to complete took 48.371802 seconds. If this number is high, consider checkpointing less frequently. I0417 06:30:03.476375 140318360377152 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 5 I0417 06:30:03.478722 140318360377152 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/5. I0417 06:30:03.779811 140318360377152 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0417 06:30:03.779923 140318360377152 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 I0417 06:30:03.823339 140318360377152 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.045239s I0417 06:30:03.823504 140318360377152 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 29.587 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.052137136459350586 s) (per-host) I0417 06:30:03.823559 140318360377152 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.052201s (batch_requests_ready=0.002551s, total_serialization_initiated=0.049578s, others=0.000071s) I0417 06:30:03.823648 140318360377152 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.057258s (all_items=0.000017s, per_item={'items': '0.00001669'}, temp_paths=0.057241) I0417 06:30:03.824337 140318360377152 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.35 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/5. I0417 06:30:03.824679 140187531212544 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 06:50:03.824642 I0417 06:30:03.834431 140318360377152 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0417 06:30:03.834698 140189083768576 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0417 06:30:03.834851 140318360377152 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776407355.1024754, 'wait_for_prev_duration_secs': 48.37180185317993, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776407403.4764144, 'checkpointer_blocking_duration_secs': 0.3484220504760742, 'get_old_steps_start_time': 1776407403.824866, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776407355.1000106, 'checkpoint_manager_blocking_duration_secs': 48.734790086746216} I0417 06:30:03.834969 140318360377152 checkpointing.py:409] Started an asynchronous checkpoint save for step 5 I0417 06:30:03.835775 140318360377152 metric_logger.py:185] completed step: 4, seconds: 0.164, TFLOP/s/device: 82.621, Tokens/s/device: 12453.482, total_weights: 65536, loss: 9.457 I0417 06:30:03.843390 140318360377152 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.366, Tokens/s/device: 13922.407, total_weights: 65536, loss: 8.955 I0417 06:30:10.803565 140165137811200 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_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/5/items/array_metadatas/process_6 I0417 06:30:27.507494 140318360377152 metric_logger.py:185] completed step: 6, seconds: 49.031, TFLOP/s/device: 0.277, Tokens/s/device: 41.769, total_weights: 65536, loss: 8.465 I0417 06:30:27.655261 140318360377152 metric_logger.py:185] completed step: 7, seconds: 23.519, TFLOP/s/device: 0.578, Tokens/s/device: 87.079, total_weights: 65536, loss: 7.998 I0417 06:30:27.803209 140318360377152 metric_logger.py:185] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.542, Tokens/s/device: 13346.019, total_weights: 65536, loss: 7.567 I0417 06:30:27.951684 140318360377152 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0417 06:30:27.952381 140318360377152 checkpointing.py:798] Waited 0.0007112026214599609 seconds for step 9 to finish before starting checkpointing. I0417 06:30:27.954498 140318360377152 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 06:30:45.671663 140187531212544 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.699 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.900251388549805 s) (per-host) I0417 06:30:45.671789 140187531212544 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.846997s. I0417 06:30:53.513281 140187531212544 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 49.688474s. I0417 06:30:53.513565 140189083768576 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 06:30:53.513688 140189083768576 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0417 06:30:53.513737 140189083768576 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0417 06:30:53.515408 140189083768576 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0417 06:30:53.515581 140318360377152 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5. W0417 06:30:53.515714 140318360377152 checkpoint_manager.py:1452] Waiting for previous save to complete took 25.561223 seconds. If this number is high, consider checkpointing less frequently. I0417 06:30:53.517471 140318360377152 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 9 I0417 06:30:53.519447 140318360377152 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/9. I0417 06:30:54.249040 140318360377152 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0417 06:30:54.249169 140318360377152 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 I0417 06:30:54.293687 140318360377152 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046279s I0417 06:30:54.293859 140318360377152 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 28.966 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.05325484275817871 s) (per-host) I0417 06:30:54.293910 140318360377152 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.053318s (batch_requests_ready=0.002635s, total_serialization_initiated=0.050615s, others=0.000068s) I0417 06:30:54.294004 140318360377152 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.057591s (all_items=0.000012s, per_item={'items': '0.00001192'}, temp_paths=0.057580) I0417 06:30:54.294741 140318360377152 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_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/9. I0417 06:30:54.295041 140189083768576 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 06:50:54.295018 I0417 06:30:54.297013 140318360377152 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0417 06:30:54.297256 140165137811200 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0417 06:30:54.297411 140318360377152 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776407427.954468, 'wait_for_prev_duration_secs': 25.56122326850891, 'time_between_consecutive_saves_sec': 24.48040795326233, 'checkpointer_blocking_start_time': 1776407453.5175116, 'checkpointer_blocking_duration_secs': 0.7776296138763428, 'get_old_steps_start_time': 1776407454.2951598, 'get_old_steps_duration_secs': 2.4557113647460938e-05, 'checkpoint_manager_blocking_start_time': 1776407427.9526095, 'checkpoint_manager_blocking_duration_secs': 26.34477162361145} I0417 06:30:54.297528 140318360377152 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0417 06:30:54.297571 140318360377152 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 06:31:00.637295 140186943985408 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_20260417_023710/nnx_xpk_feat_nnx_post_train_fixes_20260417_023710_16_zarr3_false/checkpoints/9/items/array_metadatas/process_6 I0417 06:31:36.907245 140189083768576 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.022 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.66660213470459 s) (per-host) I0417 06:31:36.907371 140189083768576 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.612252s. I0417 06:31:47.400615 140189083768576 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 53.105478s. I0417 06:31:47.400912 140165137811200 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 06:31:47.401033 140165137811200 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0417 06:31:47.401075 140165137811200 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0417 06:31:47.404460 140165137811200 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0417 06:31:47.404619 140318360377152 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. I0417 06:31:47.404799 140318360377152 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 06:31:47.405439 140318360377152 metric_logger.py:185] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.914, Tokens/s/device: 13854.313, total_weights: 65536, loss: 7.176 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Fri Apr 17 06:31:57 UTC 2026 EXIT_CODE=0