XPK Start: Sun Apr 19 02:42:50 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 02:43:14.397389: 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 02:43:14.578259 137962049734464 max_utils.py:273] Attempting to initialize the jax distributed system... I0419 02:43:23.619070 137962049734464 distributed.py:149] Starting JAX distributed service on [::]:8482 I0419 02:43:23.621506 137962049734464 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-true-rs-wxdqi-slice-job-0-0.mt-16-zarr3-true-rs-wxdqi:8482 I0419 02:43:24.961052 137962049734464 max_utils.py:284] Jax distributed system initialized! I0419 02:43:30.912825 137962049734464 max_utils.py:800] System Information: Jax Version: 0.9.2 I0419 02:43:30.912928 137962049734464 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0419 02:43:30.912969 137962049734464 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 02:43:30.913002 137962049734464 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0419 02:43:31.604576 137962049734464 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0419 02:43:31.718853 137962049734464 checkpointing.py:688] Setting up checkpoint logger... I0419 02:43:31.718969 137962049734464 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0419 02:43:31.719015 137962049734464 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0419 02:43:31.719210 137962049734464 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 0x7d792d118f50>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0419 02:43:33.014983 137962049734464 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0419 02:43:33.015287 137962049734464 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 0x7d65606fa930>}, handler_registry=None I0419 02:43:33.015602 137962049734464 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d65606fa930>` 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 02:43:33.015665 137962049734464 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d65606fa3c0>` 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 02:43:33.015713 137962049734464 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 0x7d65606fa930>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d65606fa930>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d65606fa3c0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d65606fa3c0>}). I0419 02:43:33.016129 137962049734464 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0419 02:43:33.016223 137962049734464 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d656078cfe0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0419 02:43:36.500536 137844458764032 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776566351696178052, 'commit_timestamp_nsecs': 1776566395008464974, 'custom_metadata': {}} from gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_16_zarr3_true/checkpoints/0/_CHECKPOINT_METADATA I0419 02:43:36.748399 137844441978624 checkpoint_manager.py:1871] Missing metrics for step 9 I0419 02:43:37.177193 137962049734464 checkpoint_manager.py:1812] Found 3 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_16_zarr3_true/checkpoints I0419 02:43:37.633346 137962049734464 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_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d658017f2c0> I0419 02:43:37.633527 137962049734464 checkpointing.py:302] Checkpoint manager created! I0419 02:43:38.596679 137962049734464 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0419 02:43:38.596800 137962049734464 checkpointing.py:582] restoring from this run's directory step 9 I0419 02:43:39.280156 137962049734464 event_tracking.py:70] [process=6] [sync] Started load checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_16_zarr3_true/checkpoints/9. I0419 02:43:39.524655 137962049734464 checkpointer.py:307] Restoring checkpoint from gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_16_zarr3_true/checkpoints/9. I0419 02:43:39.525055 137962049734464 event_tracking.py:125] [process=6] [sync] Finished blocking load in 0.24 seconds. Continuing load @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_16_zarr3_true/checkpoints/9. I0419 02:43:40.915742 1415 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0419 02:43:49.168654 137962049734464 jax_array_handlers.py:843] [process=6] /jax/orbax/read/worker/io/requested throughput: 191.330 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 8.259408712387085 s) (per-host) I0419 02:43:49.177517 137962049734464 base_pytree_checkpoint_handler.py:130] [process=6] /jax/checkpoint/read/gbytes_per_sec: 182.369 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 8.678030729293823 s) (per-host) I0419 02:43:49.179875 137962049734464 event_tracking.py:138] [process=6] [sync] Finished load in 9.90 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_16_zarr3_true/checkpoints/9 I0419 02:43:49.179970 137962049734464 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/nnx_xpk_feat_nnx_post_train_fixes_20260418_235007_16_zarr3_true/checkpoints', 'checkpointer_start_time': 1776566619.280058, 'checkpointer_duration_secs': 9.899884462356567, 'checkpoint_manager_start_time': 1776566618.5974677, 'checkpoint_manager_duration_secs': 10.58247685432434} fsdp: 32 I0419 02:43:49.257591 137962049734464 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0419 02:43:49.257703 137962049734464 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0419 02:43:49.257753 137962049734464 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0419 02:43:49.257795 137962049734464 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0419 02:43:49.257833 137962049734464 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0419 02:43:49.257867 137962049734464 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0419 02:43:49.257903 137962049734464 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 02:43:49.257938 137962049734464 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0419 02:43:49.257972 137962049734464 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 02:43:49.258004 137962049734464 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 02:43:49.258038 137962049734464 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0419 02:43:49.258072 137962049734464 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0419 02:43:49.666826 137962049734464 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 02:43:49.666922 137962049734464 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 02:43:49.672487 137962049734464 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 02:43:49.672545 137962049734464 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 02:43:49.688924 137962049734464 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 02:43:49.688984 137962049734464 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 02:43:49.704705 137962049734464 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 02:43:49.704762 137962049734464 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 02:43:49.728811 137962049734464 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 02:43:49.728880 137962049734464 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 02:43:49.744738 137962049734464 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 02:43:49.744798 137962049734464 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 02:43:49.760603 137962049734464 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 02:43:49.760664 137962049734464 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 02:43:49.792023 137962049734464 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0419 02:43:49.792094 137962049734464 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 02:43:49.812160 137962049734464 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0419 02:43:49.812228 137962049734464 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0419 02:44:01.352366 137962049734464 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 02:44:01.354808 137962049734464 metric_logger.py:301] number parameters: 1.104 billion I0419 02:44:12.986598 137962049734464 checkpointing.py:794] Waiting for step 10 to finish before checkpoint... I0419 02:44:13.139098 137962049734464 checkpointing.py:798] Waited 0.15248537063598633 seconds for step 10 to finish before starting checkpointing. I0419 02:44:13.141639 137962049734464 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 02:44:13.143753 137962049734464 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 10 I0419 02:44:13.145117 137962049734464 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_16_zarr3_true/checkpoints/10. I0419 02:44:13.886331 137962049734464 signaling_client.py:364] Using JaxDistributedSignalingClient I0419 02:44:13.887525 137962049734464 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0419 02:44:13.887585 137962049734464 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 02:44:14.164685 137962049734464 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.279185s I0419 02:44:14.164858 137962049734464 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.385 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2864680290222168 s) (per-host) I0419 02:44:14.164911 137962049734464 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.286532s (batch_requests_ready=0.002981s, total_serialization_initiated=0.283478s, others=0.000072s) I0419 02:44:14.165005 137962049734464 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.290676s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.290659) I0419 02:44:14.165656 137962049734464 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.02 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_16_zarr3_true/checkpoints/10. I0419 02:44:14.165997 137843837998848 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 03:04:14.165960 I0419 02:44:14.172484 137962049734464 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize I0419 02:44:14.172800 137840082917120 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0419 02:44:14.172960 137962049734464 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_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776566653.14162, 'wait_for_prev_duration_secs': 6.318092346191406e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776566653.1437914, 'checkpointer_blocking_duration_secs': 1.0223560333251953, 'get_old_steps_start_time': 1776566654.16617, 'get_old_steps_duration_secs': 3.24249267578125e-05, 'checkpoint_manager_blocking_start_time': 1776566653.1395314, 'checkpoint_manager_blocking_duration_secs': 1.0333905220031738} I0419 02:44:14.173072 137962049734464 checkpointing.py:409] Started an asynchronous checkpoint save for step 10 I0419 02:44:14.173141 137962049734464 max_utils.py:750] Memstats: After params initialized: I0419 02:44:14.173192 137962049734464 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0419 02:44:14.173223 137962049734464 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0419 02:44:14.173276 137962049734464 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0419 02:44:14.173312 137962049734464 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0419 02:44:14.493069 137962049734464 metric_logger.py:196] completed step: 10, seconds: 11.631, TFLOP/s/device: 1.168, Tokens/s/device: 176.086, total_weights: 65536, loss: 6.827, lm_loss: 6.827, perplexity: 922.537 I0419 02:44:14.670828 137962049734464 metric_logger.py:196] completed step: 11, seconds: 1.505, TFLOP/s/device: 9.030, Tokens/s/device: 1361.113, total_weights: 65536, loss: 6.522, lm_loss: 6.522, perplexity: 679.821 I0419 02:44:14.818864 137962049734464 metric_logger.py:196] completed step: 12, seconds: 0.021, TFLOP/s/device: 657.909, Tokens/s/device: 99167.151, total_weights: 65536, loss: 6.260, lm_loss: 6.260, perplexity: 523.013 I0419 02:44:14.966356 137962049734464 metric_logger.py:196] completed step: 13, seconds: 0.165, TFLOP/s/device: 82.180, Tokens/s/device: 12387.122, total_weights: 65536, loss: 6.039, lm_loss: 6.039, perplexity: 419.520 I0419 02:44:14.973605 137962049734464 checkpointing.py:794] Waiting for step 15 to finish before checkpoint... I0419 02:44:15.261400 137962049734464 checkpointing.py:798] Waited 0.2877647876739502 seconds for step 15 to finish before starting checkpointing. I0419 02:44:15.264165 137962049734464 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 02:44:19.059441 137840091309824 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_16_zarr3_true/checkpoints/10/items/array_metadatas/process_6 I0419 02:44:56.118447 137843837998848 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.396 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.24001979827881 s) (per-host) I0419 02:44:56.118580 137843837998848 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.952471s. I0419 02:45:03.471527 137843837998848 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 49.305395s. I0419 02:45:03.471801 137840082917120 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 02:45:03.471920 137840082917120 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0419 02:45:03.471969 137840082917120 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts... I0419 02:45:03.473743 137840082917120 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts. I0419 02:45:03.473907 137962049734464 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 02:45:03.474041 137962049734464 checkpoint_manager.py:1452] Waiting for previous save to complete took 48.209877 seconds. If this number is high, consider checkpointing less frequently. I0419 02:45:03.476126 137962049734464 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 15 I0419 02:45:03.478833 137962049734464 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_16_zarr3_true/checkpoints/15. I0419 02:45:04.201371 137962049734464 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0419 02:45:04.201466 137962049734464 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 02:45:04.227617 137962049734464 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027870s I0419 02:45:04.227798 137962049734464 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 44.082 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03499317169189453 s) (per-host) I0419 02:45:04.227850 137962049734464 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.035056s (batch_requests_ready=0.002738s, total_serialization_initiated=0.032246s, others=0.000072s) I0419 02:45:04.227954 137962049734464 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.040334s (all_items=0.000013s, per_item={'items': '0.00001287'}, temp_paths=0.040321) I0419 02:45:04.228712 137962049734464 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.75 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_16_zarr3_true/checkpoints/15. I0419 02:45:04.228991 137840082917120 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 03:05:04.228962 I0419 02:45:04.252126 137962049734464 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize I0419 02:45:04.252426 137840091309824 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0419 02:45:04.252594 137962049734464 standard_logger.py:34] {'step': 15, '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_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776566655.264135, 'wait_for_prev_duration_secs': 48.209877014160156, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776566703.476165, 'checkpointer_blocking_duration_secs': 0.752943754196167, 'get_old_steps_start_time': 1776566704.2291327, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776566655.2617645, 'checkpoint_manager_blocking_duration_secs': 48.990792751312256} I0419 02:45:04.252711 137962049734464 checkpointing.py:409] Started an asynchronous checkpoint save for step 15 I0419 02:45:04.253814 137962049734464 metric_logger.py:196] completed step: 14, seconds: 0.147, TFLOP/s/device: 92.221, Tokens/s/device: 13900.484, total_weights: 65536, loss: 5.858, lm_loss: 5.858, perplexity: 350.067 I0419 02:45:04.262210 137962049734464 metric_logger.py:196] completed step: 15, seconds: 0.149, TFLOP/s/device: 91.333, Tokens/s/device: 13766.772, total_weights: 65536, loss: 5.713, lm_loss: 5.713, perplexity: 302.780 I0419 02:45:10.788653 137837949204224 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_16_zarr3_true/checkpoints/15/items/array_metadatas/process_6 I0419 02:45:26.812947 137962049734464 metric_logger.py:196] completed step: 16, seconds: 49.287, TFLOP/s/device: 0.276, Tokens/s/device: 41.553, total_weights: 65536, loss: 5.599, lm_loss: 5.599, perplexity: 270.201 I0419 02:45:26.960826 137962049734464 metric_logger.py:196] completed step: 17, seconds: 22.406, TFLOP/s/device: 0.606, Tokens/s/device: 91.406, total_weights: 65536, loss: 5.511, lm_loss: 5.511, perplexity: 247.443 I0419 02:45:27.108297 137962049734464 metric_logger.py:196] completed step: 18, seconds: 0.153, TFLOP/s/device: 88.586, Tokens/s/device: 13352.632, total_weights: 65536, loss: 5.442, lm_loss: 5.442, perplexity: 230.909 I0419 02:45:27.256620 137962049734464 checkpointing.py:794] Waiting for step 19 to finish before checkpoint... I0419 02:45:27.257349 137962049734464 checkpointing.py:798] Waited 0.0007405281066894531 seconds for step 19 to finish before starting checkpointing. I0419 02:45:27.259403 137962049734464 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 02:45:48.038957 137840082917120 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.026 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.84611392021179 s) (per-host) I0419 02:45:48.039083 137840082917120 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.810000s. I0419 02:45:56.299085 137840082917120 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 52.069984s. I0419 02:45:56.299367 137840091309824 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 02:45:56.299496 137840091309824 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0419 02:45:56.299545 137840091309824 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts... I0419 02:45:56.300951 137840091309824 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts. I0419 02:45:56.301115 137962049734464 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15. W0419 02:45:56.301258 137962049734464 checkpoint_manager.py:1452] Waiting for previous save to complete took 29.041843 seconds. If this number is high, consider checkpointing less frequently. I0419 02:45:56.302830 137962049734464 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 19 I0419 02:45:56.305116 137962049734464 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_16_zarr3_true/checkpoints/19. I0419 02:45:57.062876 137962049734464 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0419 02:45:57.062971 137962049734464 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 02:45:57.087938 137962049734464 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.026672s I0419 02:45:57.088062 137962049734464 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 45.557 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.033859968185424805 s) (per-host) I0419 02:45:57.088107 137962049734464 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.033914s (batch_requests_ready=0.002892s, total_serialization_initiated=0.030964s, others=0.000058s) I0419 02:45:57.088183 137962049734464 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.038555s (all_items=0.000011s, per_item={'items': '0.00001073'}, temp_paths=0.038545) I0419 02:45:57.088819 137962049734464 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.79 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_16_zarr3_true/checkpoints/19. I0419 02:45:57.089186 137840091309824 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 03:05:57.089149 I0419 02:45:57.093526 137962049734464 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize I0419 02:45:57.093768 137837445904128 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0419 02:45:57.093898 137962049734464 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_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776566727.259375, 'wait_for_prev_duration_secs': 29.04184317588806, 'time_between_consecutive_saves_sec': 23.78559136390686, 'checkpointer_blocking_start_time': 1776566756.3028696, 'checkpointer_blocking_duration_secs': 0.7864820957183838, 'get_old_steps_start_time': 1776566757.0893717, 'get_old_steps_duration_secs': 2.6226043701171875e-05, 'checkpoint_manager_blocking_start_time': 1776566727.2575984, 'checkpoint_manager_blocking_duration_secs': 29.836267471313477} I0419 02:45:57.094022 137962049734464 checkpointing.py:409] Started an asynchronous checkpoint save for step 19 I0419 02:45:57.094064 137962049734464 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 02:46:02.933476 137837949204224 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_16_zarr3_true/checkpoints/19/items/array_metadatas/process_6 I0419 02:46:39.947099 137840091309824 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.827 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.892858266830444 s) (per-host) I0419 02:46:39.947221 137840091309824 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.857901s. I0419 02:46:48.475742 137840091309824 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 51.386401s. I0419 02:46:48.476034 137837445904128 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 02:46:48.476158 137837445904128 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0419 02:46:48.476198 137837445904128 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts... I0419 02:46:48.477938 137837445904128 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts. I0419 02:46:48.478122 137962049734464 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 02:46:48.478305 137962049734464 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 02:46:48.479285 137962049734464 metric_logger.py:196] completed step: 19, seconds: 0.148, TFLOP/s/device: 91.797, Tokens/s/device: 13836.622, total_weights: 65536, loss: 5.385, lm_loss: 5.385, perplexity: 218.045 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Sun Apr 19 02:47:00 UTC 2026 EXIT_CODE=0