XPK Start: Mon Apr 20 17:36:52 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-20 17:37:31.416577: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0420 17:37:31.595714 137679678887744 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 17:37:40.635774 137679678887744 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 17:37:40.638062 137679678887744 distributed.py:172] Connecting to JAX distributed service on mt-02-synthetic-qw6t5-slice-job-0-0.mt-02-synthetic-qw6t5:8482 I0420 17:37:42.503784 137679678887744 max_utils.py:284] Jax distributed system initialized! I0420 17:37:48.956257 137679678887744 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 17:37:48.956358 137679678887744 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 17:37:48.956397 137679678887744 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365 I0420 17:37:48.956431 137679678887744 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 17:37:49.647768 137679678887744 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 17:37:49.759949 137679678887744 checkpointing.py:688] Setting up checkpoint logger... I0420 17:37:49.760062 137679678887744 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 17:37:49.760108 137679678887744 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 17:37:49.760299 137679678887744 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 0x7d375494c560>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 17:37:53.072271 137679678887744 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 17:37:53.072500 137679678887744 checkpoint_manager.py:708] [process=1][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d230c46d940>}, handler_registry=None I0420 17:37:53.072757 137679678887744 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d230c46d940>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0420 17:37:53.072810 137679678887744 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d230c13ddc0>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0420 17:37:53.072846 137679678887744 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 0x7d230c46d940>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d230c46d940>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d230c13ddc0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d230c13ddc0>}). I0420 17:37:53.073164 137679678887744 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 17:37:53.073235 137679678887744 async_checkpointer.py:192] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d230c1d8fe0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 17:37:53.860889 137679678887744 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints I0420 17:37:54.315461 137679678887744 checkpoint_manager.py:929] [process=1][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d230c727980> I0420 17:37:54.315641 137679678887744 checkpointing.py:302] Checkpoint manager created! I0420 17:37:55.286300 137679678887744 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 17:37:55.286418 137679678887744 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 17:37:56.675576 137679678887744 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0420 17:37:56.675701 137679678887744 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 17:37:56.675755 137679678887744 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 17:37:56.675798 137679678887744 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0420 17:37:56.675835 137679678887744 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 17:37:56.675875 137679678887744 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 17:37:56.675911 137679678887744 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:37:56.675948 137679678887744 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0420 17:37:56.675983 137679678887744 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:37:56.676016 137679678887744 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 17:37:56.676049 137679678887744 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0420 17:37:56.676080 137679678887744 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0420 17:37:57.076543 137679678887744 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 17:37:57.076648 137679678887744 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:37:57.081985 137679678887744 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 17:37:57.082042 137679678887744 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:37:57.098121 137679678887744 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 17:37:57.098182 137679678887744 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:37:57.113780 137679678887744 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 17:37:57.113851 137679678887744 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 17:37:57.138555 137679678887744 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 17:37:57.138628 137679678887744 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:37:57.154267 137679678887744 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 17:37:57.154327 137679678887744 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:37:57.169749 137679678887744 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 17:37:57.169810 137679678887744 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:37:57.199874 137679678887744 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 17:37:57.199948 137679678887744 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 17:37:57.219552 137679678887744 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 17:37:57.219626 137679678887744 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 17:38:08.620042 137679678887744 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. I0420 17:38:08.622422 137679678887744 metric_logger.py:301] number parameters: 1.104 billion I0420 17:38:19.778101 137679678887744 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 17:38:19.931385 137679678887744 checkpointing.py:798] Waited 0.15326905250549316 seconds for step 0 to finish before starting checkpointing. I0420 17:38:19.933832 137679678887744 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 17:38:19.935671 137679678887744 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 0 I0420 17:38:19.937063 137679678887744 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints/0. I0420 17:38:20.645012 137679678887744 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 17:38:20.646038 137679678887744 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 17:38:20.646096 137679678887744 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0420 17:38:20.930843 137679678887744 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.286612s I0420 17:38:20.931015 137679678887744 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 5.217 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29567956924438477 s) (per-host) I0420 17:38:20.931070 137679678887744 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.295745s (batch_requests_ready=0.003033s, total_serialization_initiated=0.292638s, others=0.000074s) I0420 17:38:20.931169 137679678887744 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.299920s (all_items=0.000019s, per_item={'items': '0.00001860'}, temp_paths=0.299901) I0420 17:38:20.931987 137679678887744 event_tracking.py:125] [process=1] [async] Finished blocking save in 1.00 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints/0. I0420 17:38:20.932340 137550622619392 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 17:58:20.932302 I0420 17:38:20.934381 137679678887744 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 17:38:20.934632 137550085748480 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0420 17:38:20.934800 137679678887744 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776706699.9338133, 'wait_for_prev_duration_secs': 6.580352783203125e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776706699.93571, 'checkpointer_blocking_duration_secs': 0.9967379570007324, 'get_old_steps_start_time': 1776706700.9324741, 'get_old_steps_duration_secs': 2.86102294921875e-05, 'checkpoint_manager_blocking_start_time': 1776706699.9317844, 'checkpoint_manager_blocking_duration_secs': 1.002978801727295} I0420 17:38:20.934912 137679678887744 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 17:38:20.934977 137679678887744 max_utils.py:750] Memstats: After params initialized: I0420 17:38:20.935026 137679678887744 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0420 17:38:20.935060 137679678887744 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0420 17:38:20.935088 137679678887744 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0420 17:38:20.935113 137679678887744 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0420 17:38:21.252880 137679678887744 metric_logger.py:196] completed step: 0, seconds: 11.155, TFLOP/s/device: 1.218, Tokens/s/device: 183.601, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 17:38:21.423143 137679678887744 metric_logger.py:196] completed step: 1, seconds: 1.473, TFLOP/s/device: 9.225, Tokens/s/device: 1390.560, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 17:38:21.819572 137679678887744 metric_logger.py:196] completed step: 2, seconds: 0.024, TFLOP/s/device: 562.684, Tokens/s/device: 84813.849, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0420 17:38:21.967241 137679678887744 metric_logger.py:196] completed step: 3, seconds: 0.387, TFLOP/s/device: 35.150, Tokens/s/device: 5298.191, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0420 17:38:22.263450 137679678887744 metric_logger.py:196] completed step: 4, seconds: 0.164, TFLOP/s/device: 82.699, Tokens/s/device: 12465.307, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0420 17:38:22.271437 137679678887744 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.320, Tokens/s/device: 13915.501, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0420 17:38:24.464921 2826 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 17:38:26.938127 137550568613632 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints/0/items/array_metadatas/process_1 I0420 17:38:44.737954 137679678887744 metric_logger.py:196] completed step: 6, seconds: 0.297, TFLOP/s/device: 45.719, Tokens/s/device: 6891.238, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0420 17:38:44.885646 137679678887744 metric_logger.py:196] completed step: 7, seconds: 22.320, TFLOP/s/device: 0.609, Tokens/s/device: 91.755, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0420 17:38:45.033461 137679678887744 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.657, Tokens/s/device: 13363.349, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0420 17:38:45.181485 137679678887744 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 17:38:45.182179 137679678887744 checkpointing.py:798] Waited 0.0007033348083496094 seconds for step 9 to finish before starting checkpointing. I0420 17:38:45.184169 137679678887744 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 17:38:57.995611 137550622619392 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 42.280 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.360238790512085 s) (per-host) I0420 17:38:57.995729 137550622619392 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.062747s. I0420 17:39:07.455445 137550622619392 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 46.522447s. I0420 17:39:07.455760 137550085748480 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 17:39:07.455923 137550085748480 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0420 17:39:07.455975 137550085748480 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 17:39:07.458691 137550085748480 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 17:39:07.458861 137679678887744 checkpoint_manager.py:2032] [process=1][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0420 17:39:07.458989 137679678887744 checkpoint_manager.py:1452] Waiting for previous save to complete took 22.274822 seconds. If this number is high, consider checkpointing less frequently. I0420 17:39:07.460899 137679678887744 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 9 I0420 17:39:07.463046 137679678887744 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints/9. I0420 17:39:08.183176 137679678887744 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 17:39:08.183271 137679678887744 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0420 17:39:08.218147 137679678887744 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036627s I0420 17:39:08.218302 137679678887744 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 35.453 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04351019859313965 s) (per-host) I0420 17:39:08.218350 137679678887744 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.043567s (batch_requests_ready=0.002595s, total_serialization_initiated=0.040909s, others=0.000064s) I0420 17:39:08.218438 137679678887744 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.047717s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.047702) I0420 17:39:08.219154 137679678887744 event_tracking.py:125] [process=1] [async] Finished blocking save in 0.76 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints/9. I0420 17:39:08.219504 137550085748480 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 17:59:08.219470 I0420 17:39:08.221512 137679678887744 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 17:39:08.221751 137550614226688 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0420 17:39:08.221873 137679678887744 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776706725.1841395, 'wait_for_prev_duration_secs': 22.274821758270264, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776706747.4609382, 'checkpointer_blocking_duration_secs': 0.7587125301361084, 'get_old_steps_start_time': 1776706748.2196848, 'get_old_steps_duration_secs': 3.0994415283203125e-05, 'checkpoint_manager_blocking_start_time': 1776706725.1824303, 'checkpoint_manager_blocking_duration_secs': 23.03940987586975} I0420 17:39:08.221983 137679678887744 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 17:39:08.222029 137679678887744 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 17:39:13.715210 137550568613632 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/nnx_xpk_feat_nnx_post_train_fixes_20260420_153543_02_synthetic/checkpoints/9/items/array_metadatas/process_1 I0420 17:39:50.394508 137550085748480 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 37.414 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.21967625617981 s) (per-host) I0420 17:39:50.394631 137550085748480 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.175015s. I0420 17:40:01.003180 137550085748480 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 52.783549s. I0420 17:40:01.003391 137550614226688 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 17:40:01.003448 137550614226688 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0420 17:40:01.003499 137550614226688 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 17:40:01.005271 137550614226688 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 17:40:01.005458 137679678887744 checkpoint_manager.py:2032] [process=1][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 17:40:01.005628 137679678887744 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 17:40:01.006548 137679678887744 metric_logger.py:196] completed step: 9, seconds: 0.149, TFLOP/s/device: 91.488, Tokens/s/device: 13790.039, total_weights: 65536, loss: 8.175, lm_loss: 8.175, perplexity: 3551.438 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Mon Apr 20 17:40:13 UTC 2026 EXIT_CODE=0