XPK Start: Sun Apr 19 01:52:04 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-19 01:52:28.365521: 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) I0419 01:52:28.542414 133738433419072 max_utils.py:273] Attempting to initialize the jax distributed system... I0419 01:52:37.583353 133738433419072 distributed.py:149] Starting JAX distributed service on [::]:8482 I0419 01:52:37.585635 133738433419072 distributed.py:172] Connecting to JAX distributed service on mt-09-pdb-lt-1-bw9rg-slice-job-0-0.mt-09-pdb-lt-1-bw9rg:8482 I0419 01:52:39.649644 133738433419072 max_utils.py:284] Jax distributed system initialized! I0419 01:52:44.658998 133738433419072 max_utils.py:800] System Information: Jax Version: 0.9.2 I0419 01:52:44.659098 133738433419072 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0419 01:52:44.659136 133738433419072 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 I0419 01:52:44.659171 133738433419072 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0419 01:52:45.708799 133738433419072 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 8, 1, 1, 1, 1, 4, 1, 1, 1, 1) I0419 01:52:45.823044 133738433419072 checkpointing.py:688] Setting up checkpoint logger... I0419 01:52:45.823159 133738433419072 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0419 01:52:45.823204 133738433419072 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0419 01:52:45.823425 133738433419072 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 0x79a1d35180b0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0419 01:52:48.837872 133738433419072 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0419 01:52:48.838100 133738433419072 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 0x79a0a4550cb0>}, handler_registry=None I0419 01:52:48.838355 133738433419072 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79a0a4550cb0>` 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`. I0419 01:52:48.838405 133738433419072 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79a0a45affb0>` 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`. I0419 01:52:48.838442 133738433419072 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 0x79a0a4550cb0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79a0a4550cb0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79a0a45affb0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79a0a45affb0>}). I0419 01:52:48.838744 133738433419072 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0419 01:52:48.838813 133738433419072 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x798e083244a0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0419 01:52:51.378599 133738433419072 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints I0419 01:52:51.381258 133738433419072 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x79a0a4528bf0> I0419 01:52:51.381380 133738433419072 checkpointing.py:302] Checkpoint manager created! I0419 01:52:52.350507 133738433419072 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0419 01:52:52.350621 133738433419072 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 8 tensor: 4 I0419 01:52:53.720865 133738433419072 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: ('tensor',) I0419 01:52:53.720978 133738433419072 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, 'tensor') I0419 01:52:53.721030 133738433419072 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, 'tensor') I0419 01:52:53.721072 133738433419072 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: ('tensor', None, 'fsdp') I0419 01:52:53.721109 133738433419072 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: ('tensor', None) I0419 01:52:53.721143 133738433419072 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: ('tensor', None) I0419 01:52:53.721179 133738433419072 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, 'tensor', None) I0419 01:52:53.721214 133738433419072 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: ('tensor', None, None, 'fsdp') I0419 01:52:53.721261 133738433419072 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, 'tensor', None) I0419 01:52:53.721296 133738433419072 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, 'tensor', None) I0419 01:52:53.721330 133738433419072 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', 'tensor') I0419 01:52:53.721361 133738433419072 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: ('tensor', 'fsdp') I0419 01:52:54.123847 133738433419072 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 01:52:54.123942 133738433419072 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0419 01:52:54.129337 133738433419072 nnx_decoders.py:465] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 01:52:54.129393 133738433419072 nnx_decoders.py:465] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0419 01:52:54.145641 133738433419072 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 01:52:54.145700 133738433419072 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0419 01:52:54.161254 133738433419072 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 01:52:54.161315 133738433419072 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0419 01:52:54.185181 133738433419072 attentions.py:1154] attentions/query Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:52:54.185256 133738433419072 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0419 01:52:54.200871 133738433419072 attentions.py:1155] attentions/key Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:52:54.200932 133738433419072 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0419 01:52:54.216486 133738433419072 attentions.py:1156] attentions/value Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:52:54.216546 133738433419072 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0419 01:52:54.246773 133738433419072 attentions.py:1197] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0419 01:52:54.246843 133738433419072 attentions.py:1197] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0419 01:52:54.266523 133738433419072 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0419 01:52:54.266586 133738433419072 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, 'tensor'). I0419 01:53:09.675787 133738433419072 max_utils.py:791] Total memory size: 0.9 GB, Output size: 0.4 GB, Temp size: 0.5 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0419 01:53:09.678262 133738433419072 metric_logger.py:301] number parameters: 1.104 billion I0419 01:53:10.627571 133738433419072 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0419 01:53:24.806953 133738433419072 checkpointing.py:798] Waited 14.179366827011108 seconds for step 0 to finish before starting checkpointing. I0419 01:53:24.809344 133738433419072 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 01:53:24.811305 133738433419072 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0 I0419 01:53:24.812763 133738433419072 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints/0. I0419 01:53:25.995222 133738433419072 signaling_client.py:364] Using JaxDistributedSignalingClient I0419 01:53:25.996205 133738433419072 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0419 01:53:25.996284 133738433419072 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 I0419 01:53:26.260081 133738433419072 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.265620s I0419 01:53:26.260260 133738433419072 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.612 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.27489495277404785 s) (per-host) I0419 01:53:26.260315 133738433419072 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.274975s (batch_requests_ready=0.003213s, total_serialization_initiated=0.271674s, others=0.000088s) I0419 01:53:26.260411 133738433419072 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.278899s (all_items=0.000017s, per_item={'items': '0.00001740'}, temp_paths=0.278882) I0419 01:53:26.261246 133738433419072 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.45 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints/0. I0419 01:53:26.261556 133612668368640 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 02:13:26.261522 I0419 01:53:26.271032 133738433419072 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0419 01:53:26.271306 133612129216256 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0419 01:53:26.271441 133738433419072 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776563604.8093245, 'wait_for_prev_duration_secs': 6.031990051269531e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776563604.8113432, 'checkpointer_blocking_duration_secs': 1.4503729343414307, 'get_old_steps_start_time': 1776563606.2617414, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776563604.807371, 'checkpoint_manager_blocking_duration_secs': 1.4640271663665771} I0419 01:53:26.271560 133738433419072 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0419 01:53:26.271635 133738433419072 max_utils.py:750] Memstats: After params initialized: I0419 01:53:26.271688 133738433419072 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0419 01:53:26.271720 133738433419072 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0419 01:53:26.271748 133738433419072 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0419 01:53:26.271774 133738433419072 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0419 01:53:26.591969 133738433419072 metric_logger.py:196] completed step: 0, seconds: 0.948, TFLOP/s/device: 3.582, Tokens/s/device: 539.968, total_weights: 16384, loss: 10.864, lm_loss: 10.864, perplexity: 52258.910 I0419 01:53:26.668512 133738433419072 metric_logger.py:196] completed step: 1, seconds: 15.962, TFLOP/s/device: 0.213, Tokens/s/device: 32.075, total_weights: 16384, loss: 10.864, lm_loss: 10.864, perplexity: 52258.910 I0419 01:53:27.085657 133738433419072 metric_logger.py:196] completed step: 2, seconds: 0.019, TFLOP/s/device: 175.753, Tokens/s/device: 26491.437, total_weights: 16384, loss: 9.760, lm_loss: 9.760, perplexity: 17319.064 I0419 01:53:27.144222 133738433419072 metric_logger.py:196] completed step: 3, seconds: 0.407, TFLOP/s/device: 8.351, Tokens/s/device: 1258.777, total_weights: 16384, loss: 8.820, lm_loss: 8.820, perplexity: 6771.344 I0419 01:53:27.262028 133738433419072 metric_logger.py:196] completed step: 4, seconds: 0.076, TFLOP/s/device: 44.719, Tokens/s/device: 6740.478, total_weights: 16384, loss: 7.947, lm_loss: 7.947, perplexity: 2825.893 I0419 01:53:27.269960 133738433419072 metric_logger.py:196] completed step: 5, seconds: 0.058, TFLOP/s/device: 58.599, Tokens/s/device: 8832.612, total_weights: 16384, loss: 7.209, lm_loss: 7.209, perplexity: 1352.040 I0419 01:53:30.388509 2547 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0419 01:53:33.258678 133612137608960 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints/0/items/array_metadatas/process_6 I0419 01:53:42.115798 133738433419072 metric_logger.py:196] completed step: 6, seconds: 0.119, TFLOP/s/device: 28.607, Tokens/s/device: 4311.942, total_weights: 16384, loss: 6.651, lm_loss: 6.651, perplexity: 773.347 I0419 01:53:42.174375 133738433419072 metric_logger.py:196] completed step: 7, seconds: 14.788, TFLOP/s/device: 0.230, Tokens/s/device: 34.622, total_weights: 16384, loss: 6.267, lm_loss: 6.267, perplexity: 526.951 I0419 01:53:42.232779 133738433419072 metric_logger.py:196] completed step: 8, seconds: 0.065, TFLOP/s/device: 52.637, Tokens/s/device: 7934.048, total_weights: 16384, loss: 6.030, lm_loss: 6.030, perplexity: 415.600 I0419 01:53:42.291909 133738433419072 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0419 01:53:42.292583 133738433419072 checkpointing.py:798] Waited 0.0006811618804931641 seconds for step 9 to finish before starting checkpointing. I0419 01:53:42.294490 133738433419072 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 01:54:03.215548 133612668368640 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 42.428 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.230159521102905 s) (per-host) I0419 01:54:03.215661 133612668368640 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.953984s. I0419 01:54:13.069059 133612668368640 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 46.807365s. I0419 01:54:13.069381 133612129216256 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 01:54:13.069507 133612129216256 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0419 01:54:13.069560 133612129216256 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0419 01:54:13.071527 133612129216256 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0419 01:54:13.071689 133738433419072 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. W0419 01:54:13.071827 133738433419072 checkpoint_manager.py:1452] Waiting for previous save to complete took 30.777336 seconds. If this number is high, consider checkpointing less frequently. I0419 01:54:13.073590 133738433419072 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 9 I0419 01:54:13.075798 133738433419072 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints/9. I0419 01:54:13.791043 133738433419072 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0419 01:54:13.791134 133738433419072 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 I0419 01:54:13.816857 133738433419072 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027417s I0419 01:54:13.817022 133738433419072 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 44.561 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03461742401123047 s) (per-host) I0419 01:54:13.817071 133738433419072 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.034677s (batch_requests_ready=0.002872s, total_serialization_initiated=0.031738s, others=0.000067s) I0419 01:54:13.817180 133738433419072 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.038596s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.038581) I0419 01:54:13.817893 133738433419072 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.74 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints/9. I0419 01:54:13.818214 133611063867136 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 02:14:13.818173 I0419 01:54:13.823367 133738433419072 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0419 01:54:13.823636 133612129216256 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0419 01:54:13.823794 133738433419072 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776563622.294461, 'wait_for_prev_duration_secs': 30.77733564376831, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776563653.0736296, 'checkpointer_blocking_duration_secs': 0.7447483539581299, 'get_old_steps_start_time': 1776563653.8184, 'get_old_steps_duration_secs': 2.9087066650390625e-05, 'checkpoint_manager_blocking_start_time': 1776563622.2928174, 'checkpoint_manager_blocking_duration_secs': 31.53094244003296} I0419 01:54:13.823908 133738433419072 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0419 01:54:13.823954 133738433419072 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 01:54:22.177519 133611558143744 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_09_pdb_lt_1/checkpoints/9/items/array_metadatas/process_6 I0419 01:54:57.126802 133611063867136 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.443 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.344364166259766 s) (per-host) I0419 01:54:57.126912 133611063867136 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.308569s. I0419 01:55:07.115963 133611063867136 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 53.297604s. I0419 01:55:07.116269 133612129216256 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 01:55:07.116498 133612129216256 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0419 01:55:07.116547 133612129216256 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0419 01:55:07.118957 133612129216256 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0419 01:55:07.119146 133738433419072 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. I0419 01:55:07.119336 133738433419072 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 01:55:07.120269 133738433419072 metric_logger.py:196] completed step: 9, seconds: 0.059, TFLOP/s/device: 57.835, Tokens/s/device: 8717.565, total_weights: 16384, loss: 5.890, lm_loss: 5.890, perplexity: 361.390 Per train step: Total TFLOPs: 3.40 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Sun Apr 19 01:55:19 UTC 2026 EXIT_CODE=0