XPK Start: Sun Apr 19 01:33:32 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 01:33:56.761493: 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 01:33:56.939471 133495939995456 max_utils.py:273] Attempting to initialize the jax distributed system... I0419 01:34:05.980330 133495939995456 distributed.py:149] Starting JAX distributed service on [::]:8482 I0419 01:34:05.982553 133495939995456 distributed.py:172] Connecting to JAX distributed service on mt-05-fp8-9boj6-slice-job-0-0.mt-05-fp8-9boj6:8482 I0419 01:34:08.291041 133495939995456 max_utils.py:284] Jax distributed system initialized! I0419 01:34:14.268514 133495939995456 max_utils.py:800] System Information: Jax Version: 0.9.2 I0419 01:34:14.268618 133495939995456 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0419 01:34:14.268659 133495939995456 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 01:34:14.268694 133495939995456 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0419 01:34:15.319324 133495939995456 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0419 01:34:15.744943 133495939995456 checkpointing.py:688] Setting up checkpoint logger... I0419 01:34:15.745064 133495939995456 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0419 01:34:15.745109 133495939995456 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0419 01:34:15.745348 133495939995456 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 0x79695e11d010>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0419 01:34:18.653022 133495939995456 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0419 01:34:18.653272 133495939995456 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 0x7955200a1250>}, handler_registry=None I0419 01:34:18.653675 133495939995456 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7955200a1250>` 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 01:34:18.653807 133495939995456 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79544811e120>` 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 01:34:18.653847 133495939995456 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 0x7955200a1250>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7955200a1250>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79544811e120>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79544811e120>}). I0419 01:34:18.654229 133495939995456 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0419 01:34:18.654348 133495939995456 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x79542432f420> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0419 01:34:21.548367 133495939995456 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_05_fp8/checkpoints I0419 01:34:21.550620 133495939995456 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_05_fp8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7955200f5b20> I0419 01:34:21.550729 133495939995456 checkpointing.py:302] Checkpoint manager created! I0419 01:34:22.818072 133495939995456 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0419 01:34:22.818191 133495939995456 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0419 01:34:24.908015 133495939995456 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0419 01:34:24.908134 133495939995456 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0419 01:34:24.908186 133495939995456 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0419 01:34:24.908265 133495939995456 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0419 01:34:24.908309 133495939995456 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0419 01:34:24.908356 133495939995456 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0419 01:34:24.908416 133495939995456 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 01:34:24.908462 133495939995456 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0419 01:34:24.908499 133495939995456 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 01:34:24.908533 133495939995456 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 01:34:24.908566 133495939995456 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0419 01:34:24.908600 133495939995456 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0419 01:34:25.328445 133495939995456 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 01:34:25.328534 133495939995456 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 01:34:25.333770 133495939995456 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 01:34:25.333825 133495939995456 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 01:34:25.349959 133495939995456 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 01:34:25.350018 133495939995456 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 01:34:25.365574 133495939995456 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 01:34:25.365633 133495939995456 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 01:34:25.425463 133495939995456 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:34:25.425545 133495939995456 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 01:34:25.441226 133495939995456 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:34:25.441298 133495939995456 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 01:34:25.456930 133495939995456 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 01:34:25.456998 133495939995456 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 01:34:25.486773 133495939995456 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0419 01:34:25.486848 133495939995456 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 01:34:25.546509 133495939995456 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0419 01:34:25.546587 133495939995456 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0419 01:34:39.492716 133495939995456 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. I0419 01:34:39.496591 133495939995456 metric_logger.py:301] number parameters: 1.104 billion I0419 01:34:53.105510 133495939995456 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0419 01:34:53.267935 133495939995456 checkpointing.py:798] Waited 0.1624143123626709 seconds for step 0 to finish before starting checkpointing. I0419 01:34:53.270640 133495939995456 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 01:34:53.273049 133495939995456 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0 I0419 01:34:53.274396 133495939995456 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_05_fp8/checkpoints/0. I0419 01:34:54.438884 133495939995456 signaling_client.py:364] Using JaxDistributedSignalingClient I0419 01:34:54.439755 133495939995456 jax_array_handlers.py:360] Scheduling D2H of 153 prioritized jax.Array. I0419 01:34:54.439820 133495939995456 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 01:34:54.849565 133495939995456 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.412355s I0419 01:34:54.849743 133495939995456 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 3.588 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.4299943447113037 s) (per-host) I0419 01:34:54.849797 133495939995456 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.430058s (batch_requests_ready=0.005624s, total_serialization_initiated=0.424363s, others=0.000071s) I0419 01:34:54.849913 133495939995456 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.434215s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.434198) I0419 01:34:54.850771 133495939995456 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.58 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_05_fp8/checkpoints/0. I0419 01:34:54.851060 133367025481472 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 01:54:54.851029 I0419 01:34:54.865484 133495939995456 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0419 01:34:54.865810 133367008696064 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0419 01:34:54.865968 133495939995456 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_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776562493.2706223, 'wait_for_prev_duration_secs': 6.318092346191406e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776562493.2730904, 'checkpointer_blocking_duration_secs': 1.5781099796295166, 'get_old_steps_start_time': 1776562494.8512256, 'get_old_steps_duration_secs': 4.458427429199219e-05, 'checkpoint_manager_blocking_start_time': 1776562493.2684205, 'checkpoint_manager_blocking_duration_secs': 1.5975096225738525} I0419 01:34:54.866095 133495939995456 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0419 01:34:54.866173 133495939995456 max_utils.py:750] Memstats: After params initialized: I0419 01:34:54.866225 133495939995456 max_utils.py:756] Using (GB) 0.45 / 31.25 (1.440000%) on TPU_24(process=6,(0,6,0,0)) I0419 01:34:54.866271 133495939995456 max_utils.py:756] Using (GB) 0.45 / 31.25 (1.440000%) on TPU_25(process=6,(1,6,0,0)) I0419 01:34:54.866299 133495939995456 max_utils.py:756] Using (GB) 0.45 / 31.25 (1.440000%) on TPU_28(process=6,(0,7,0,0)) I0419 01:34:54.866323 133495939995456 max_utils.py:756] Using (GB) 0.45 / 31.25 (1.440000%) on TPU_29(process=6,(1,7,0,0)) I0419 01:34:55.184874 133495939995456 metric_logger.py:196] completed step: 0, seconds: 13.607, TFLOP/s/device: 0.999, Tokens/s/device: 150.513, total_weights: 65536, loss: 10.872, lm_loss: 10.872, perplexity: 52680.742 I0419 01:34:55.363262 133495939995456 metric_logger.py:196] completed step: 1, seconds: 2.077, TFLOP/s/device: 6.543, Tokens/s/device: 986.261, total_weights: 65536, loss: 10.872, lm_loss: 10.872, perplexity: 52680.742 I0419 01:34:55.804853 133495939995456 metric_logger.py:196] completed step: 2, seconds: 0.026, TFLOP/s/device: 519.604, Tokens/s/device: 78320.395, total_weights: 65536, loss: 10.856, lm_loss: 10.856, perplexity: 51864.762 I0419 01:34:55.961839 133495939995456 metric_logger.py:196] completed step: 3, seconds: 0.418, TFLOP/s/device: 32.541, Tokens/s/device: 4904.896, total_weights: 65536, loss: 10.824, lm_loss: 10.824, perplexity: 50225.512 I0419 01:34:56.277007 133495939995456 metric_logger.py:196] completed step: 4, seconds: 0.187, TFLOP/s/device: 72.662, Tokens/s/device: 10952.399, total_weights: 65536, loss: 10.793, lm_loss: 10.793, perplexity: 48689.156 I0419 01:34:56.286607 133495939995456 metric_logger.py:196] completed step: 5, seconds: 0.157, TFLOP/s/device: 86.608, Tokens/s/device: 13054.564, total_weights: 65536, loss: 10.763, lm_loss: 10.763, perplexity: 47229.012 I0419 01:34:57.950920 2859 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0419 01:35:02.657406 133371338782464 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 153 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_05_fp8/checkpoints/0/items/array_metadatas/process_6 I0419 01:35:13.201966 133367025481472 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 84.110 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 18.782172679901123 s) (per-host) I0419 01:35:13.202089 133367025481472 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 18.350923s. I0419 01:35:20.479300 133495939995456 metric_logger.py:196] completed step: 6, seconds: 0.315, TFLOP/s/device: 43.075, Tokens/s/device: 6492.724, total_weights: 65536, loss: 10.733, lm_loss: 10.733, perplexity: 45864.258 I0419 01:35:20.636373 133495939995456 metric_logger.py:196] completed step: 7, seconds: 24.039, TFLOP/s/device: 0.565, Tokens/s/device: 85.195, total_weights: 65536, loss: 10.706, lm_loss: 10.706, perplexity: 44620.242 I0419 01:35:20.793491 133495939995456 metric_logger.py:196] completed step: 8, seconds: 0.163, TFLOP/s/device: 83.255, Tokens/s/device: 12549.173, total_weights: 65536, loss: 10.680, lm_loss: 10.680, perplexity: 43477.055 I0419 01:35:20.801859 133495939995456 checkpointing.py:794] Waiting for step 10 to finish before checkpoint... I0419 01:35:21.107693 133495939995456 checkpointing.py:798] Waited 0.30580592155456543 seconds for step 10 to finish before starting checkpointing. I0419 01:35:21.110164 133495939995456 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 01:35:23.075028 133367025481472 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 28.223846s. I0419 01:35:23.075342 133367008696064 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 01:35:23.075495 133367008696064 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0419 01:35:23.075556 133367008696064 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0419 01:35:23.077495 133367008696064 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0419 01:35:23.077693 133495939995456 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 01:35:23.077825 133495939995456 checkpoint_manager.py:1452] Waiting for previous save to complete took 1.967663 seconds. If this number is high, consider checkpointing less frequently. I0419 01:35:23.079507 133495939995456 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 10 I0419 01:35:23.081508 133495939995456 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_05_fp8/checkpoints/10. I0419 01:35:23.809373 133495939995456 jax_array_handlers.py:360] Scheduling D2H of 153 prioritized jax.Array. I0419 01:35:23.809476 133495939995456 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 01:35:23.859408 133495939995456 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.052611s I0419 01:35:23.859583 133495939995456 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 22.956 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.06720304489135742 s) (per-host) I0419 01:35:23.859636 133495939995456 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.067272s (batch_requests_ready=0.005238s, total_serialization_initiated=0.061957s, others=0.000077s) I0419 01:35:23.859751 133495939995456 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.071432s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.071416) I0419 01:35:23.860471 133495939995456 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_05_fp8/checkpoints/10. I0419 01:35:23.860795 133365445424896 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 01:55:23.860757 I0419 01:35:23.862842 133495939995456 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize I0419 01:35:23.863200 133367008696064 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0419 01:35:23.863351 133495939995456 standard_logger.py:34] {'step': 10, '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_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776562521.1101344, 'wait_for_prev_duration_secs': 1.9676625728607178, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776562523.0795467, 'checkpointer_blocking_duration_secs': 0.7813925743103027, 'get_old_steps_start_time': 1776562523.8609614, 'get_old_steps_duration_secs': 3.075599670410156e-05, 'checkpoint_manager_blocking_start_time': 1776562521.108141, 'checkpoint_manager_blocking_duration_secs': 2.7551770210266113} I0419 01:35:23.863522 133495939995456 checkpointing.py:409] Started an asynchronous checkpoint save for step 10 I0419 01:35:23.864140 133495939995456 metric_logger.py:196] completed step: 9, seconds: 0.157, TFLOP/s/device: 86.543, Tokens/s/device: 13044.669, total_weights: 65536, loss: 10.656, lm_loss: 10.656, perplexity: 42467.320 I0419 01:35:23.875428 133495939995456 metric_logger.py:196] completed step: 10, seconds: 0.157, TFLOP/s/device: 86.449, Tokens/s/device: 13030.477, total_weights: 65536, loss: 10.636, lm_loss: 10.636, perplexity: 41601.941 I0419 01:35:24.028425 133495939995456 metric_logger.py:196] completed step: 11, seconds: 3.071, TFLOP/s/device: 4.425, Tokens/s/device: 666.975, total_weights: 65536, loss: 10.618, lm_loss: 10.618, perplexity: 40849.570 I0419 01:35:24.185398 133495939995456 metric_logger.py:196] completed step: 12, seconds: 0.010, TFLOP/s/device: 1327.646, Tokens/s/device: 200117.256, total_weights: 65536, loss: 10.602, lm_loss: 10.602, perplexity: 40203.926 I0419 01:35:24.342263 133495939995456 metric_logger.py:196] completed step: 13, seconds: 0.154, TFLOP/s/device: 88.206, Tokens/s/device: 13295.334, total_weights: 65536, loss: 10.588, lm_loss: 10.588, perplexity: 39652.145 I0419 01:35:24.499128 133495939995456 metric_logger.py:196] completed step: 14, seconds: 0.157, TFLOP/s/device: 86.572, Tokens/s/device: 13049.074, total_weights: 65536, loss: 10.577, lm_loss: 10.577, perplexity: 39212.879 I0419 01:35:25.376158 133495939995456 metric_logger.py:196] completed step: 15, seconds: 0.157, TFLOP/s/device: 86.656, Tokens/s/device: 13061.808, total_weights: 65536, loss: 10.568, lm_loss: 10.568, perplexity: 38879.223 I0419 01:35:25.532974 133495939995456 metric_logger.py:196] completed step: 16, seconds: 0.871, TFLOP/s/device: 15.594, Tokens/s/device: 2350.546, total_weights: 65536, loss: 10.562, lm_loss: 10.562, perplexity: 38619.105 I0419 01:35:25.690051 133495939995456 metric_logger.py:196] completed step: 17, seconds: 0.163, TFLOP/s/device: 83.593, Tokens/s/device: 12599.975, total_weights: 65536, loss: 10.556, lm_loss: 10.556, perplexity: 38395.816 I0419 01:35:25.846824 133495939995456 metric_logger.py:196] completed step: 18, seconds: 0.157, TFLOP/s/device: 86.569, Tokens/s/device: 13048.575, total_weights: 65536, loss: 10.552, lm_loss: 10.552, perplexity: 38236.652 I0419 01:35:26.005411 133495939995456 checkpointing.py:794] Waiting for step 19 to finish before checkpoint... I0419 01:35:26.006670 133495939995456 checkpointing.py:798] Waited 0.0012705326080322266 seconds for step 19 to finish before starting checkpointing. I0419 01:35:26.008919 133495939995456 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 01:35:31.072294 133365420246784 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 153 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_05_fp8/checkpoints/10/items/array_metadatas/process_6 I0419 01:35:45.608850 133365445424896 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 72.411 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 21.816452741622925 s) (per-host) I0419 01:35:45.608961 133365445424896 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 21.748055s. I0419 01:35:53.116534 133365445424896 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 29.255612s. I0419 01:35:53.116824 133367008696064 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 01:35:53.116940 133367008696064 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0419 01:35:53.116989 133367008696064 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts... I0419 01:35:53.118420 133367008696064 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts. I0419 01:35:53.118610 133495939995456 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10. W0419 01:35:53.118737 133495939995456 checkpoint_manager.py:1452] Waiting for previous save to complete took 27.109822 seconds. If this number is high, consider checkpointing less frequently. I0419 01:35:53.120651 133495939995456 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 19 I0419 01:35:53.122688 133495939995456 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_05_fp8/checkpoints/19. I0419 01:35:54.270573 133495939995456 jax_array_handlers.py:360] Scheduling D2H of 153 prioritized jax.Array. I0419 01:35:54.270667 133495939995456 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 01:35:54.323188 133495939995456 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.055091s I0419 01:35:54.323367 133495939995456 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 22.302 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.06917357444763184 s) (per-host) I0419 01:35:54.323418 133495939995456 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.069232s (batch_requests_ready=0.005121s, total_serialization_initiated=0.064048s, others=0.000063s) I0419 01:35:54.323527 133495939995456 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.073377s (all_items=0.000011s, per_item={'items': '0.00001121'}, temp_paths=0.073366) I0419 01:35:54.324319 133495939995456 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.20 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_05_fp8/checkpoints/19. I0419 01:35:54.324624 133371338782464 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 01:55:54.324588 I0419 01:35:54.326555 133495939995456 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize I0419 01:35:54.326858 133367008696064 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0419 01:35:54.326997 133495939995456 standard_logger.py:34] {'step': 19, '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_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776562526.00889, 'wait_for_prev_duration_secs': 27.109822273254395, 'time_between_consecutive_saves_sec': 2.9313483238220215, 'checkpointer_blocking_start_time': 1776562553.1206906, 'checkpointer_blocking_duration_secs': 1.2040789127349854, 'get_old_steps_start_time': 1776562554.3247898, 'get_old_steps_duration_secs': 2.6702880859375e-05, 'checkpoint_manager_blocking_start_time': 1776562526.0069816, 'checkpoint_manager_blocking_duration_secs': 28.319984436035156} I0419 01:35:54.327163 133495939995456 checkpointing.py:409] Started an asynchronous checkpoint save for step 19 I0419 01:35:54.327205 133495939995456 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 01:36:01.546571 133367542552320 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 153 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_05_fp8/checkpoints/19/items/array_metadatas/process_6 I0419 01:36:16.970084 133371338782464 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 69.544 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 22.715840578079224 s) (per-host) I0419 01:36:16.970204 133371338782464 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 22.645465s. I0419 01:36:25.035668 133371338782464 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 30.710912s. I0419 01:36:25.035962 133367008696064 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 01:36:25.036084 133367008696064 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0419 01:36:25.036125 133367008696064 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts... I0419 01:36:25.037761 133367008696064 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts. I0419 01:36:25.037943 133495939995456 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19. I0419 01:36:25.038118 133495939995456 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 01:36:25.040563 133495939995456 metric_logger.py:196] completed step: 19, seconds: 0.157, TFLOP/s/device: 86.544, Tokens/s/device: 13044.918, total_weights: 65536, loss: 10.549, lm_loss: 10.549, perplexity: 38125.074 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Sun Apr 19 01:36:37 UTC 2026 EXIT_CODE=0