XPK Start: Sat Apr 18 22:29:51 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-18 22:30:15.371172: 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) I0418 22:30:15.548250 137114082010944 max_utils.py:273] Attempting to initialize the jax distributed system... I0418 22:30:24.589332 137114082010944 distributed.py:149] Starting JAX distributed service on [::]:8482 I0418 22:30:24.591795 137114082010944 distributed.py:172] Connecting to JAX distributed service on mt-07-eval-4gu0v-slice-job-0-0.mt-07-eval-4gu0v:8482 I0418 22:30:26.423936 137114082010944 max_utils.py:284] Jax distributed system initialized! I0418 22:30:32.545820 137114082010944 max_utils.py:800] System Information: Jax Version: 0.9.2 I0418 22:30:32.545923 137114082010944 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0418 22:30:32.545963 137114082010944 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 I0418 22:30:32.545998 137114082010944 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0418 22:30:33.602274 137114082010944 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0418 22:30:33.715119 137114082010944 checkpointing.py:688] Setting up checkpoint logger... I0418 22:30:33.715228 137114082010944 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0418 22:30:33.715271 137114082010944 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0418 22:30:33.715476 137114082010944 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 0x7cb3cffee6c0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0418 22:30:36.513622 137114082010944 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0418 22:30:36.513818 137114082010944 checkpoint_manager.py:708] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cb298395fd0>}, handler_registry=None I0418 22:30:36.514049 137114082010944 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cb298395fd0>` 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`. I0418 22:30:36.514097 137114082010944 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c9f2848a060>` 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`. I0418 22:30:36.514133 137114082010944 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 0x7cb298395fd0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cb298395fd0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c9f2848a060>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c9f2848a060>}). I0418 22:30:36.514452 137114082010944 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0418 22:30:36.514522 137114082010944 async_checkpointer.py:192] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7c9f481905e0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0418 22:30:38.457654 137114082010944 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints I0418 22:30:38.460747 137114082010944 checkpoint_manager.py:929] [process=0][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_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7cb298519ca0> I0418 22:30:38.460872 137114082010944 checkpointing.py:302] Checkpoint manager created! I0418 22:30:39.422922 137114082010944 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0418 22:30:39.423039 137114082010944 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0418 22:30:40.792016 137114082010944 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0418 22:30:40.792131 137114082010944 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0418 22:30:40.792180 137114082010944 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0418 22:30:40.792221 137114082010944 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0418 22:30:40.792256 137114082010944 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0418 22:30:40.792289 137114082010944 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0418 22:30:40.792322 137114082010944 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0418 22:30:40.792354 137114082010944 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0418 22:30:40.792389 137114082010944 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0418 22:30:40.792422 137114082010944 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0418 22:30:40.792453 137114082010944 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0418 22:30:40.792482 137114082010944 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0418 22:30:41.187764 137114082010944 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0418 22:30:41.187871 137114082010944 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 22:30:41.194245 137114082010944 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0418 22:30:41.194304 137114082010944 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 22:30:41.211012 137114082010944 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0418 22:30:41.211073 137114082010944 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 22:30:41.227222 137114082010944 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0418 22:30:41.227278 137114082010944 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 22:30:41.251617 137114082010944 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 22:30:41.251690 137114082010944 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 22:30:41.268181 137114082010944 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 22:30:41.268240 137114082010944 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 22:30:41.284435 137114082010944 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 22:30:41.284492 137114082010944 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 22:30:41.315073 137114082010944 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0418 22:30:41.315143 137114082010944 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 22:30:41.335403 137114082010944 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0418 22:30:41.335466 137114082010944 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0418 22:30:52.683147 137114082010944 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. I0418 22:30:52.692483 137114082010944 metric_logger.py:301] number parameters: 1.104 billion I0418 22:31:04.101028 137114082010944 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0418 22:31:04.253213 137114082010944 checkpointing.py:798] Waited 0.15216398239135742 seconds for step 0 to finish before starting checkpointing. I0418 22:31:04.256038 137114082010944 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0418 22:31:04.257654 137114082010944 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 0 I0418 22:31:04.259078 137114082010944 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0. I0418 22:31:05.003106 137114082010944 signaling_client.py:364] Using JaxDistributedSignalingClient I0418 22:31:05.022267 137114082010944 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0418 22:31:05.022336 137114082010944 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 I0418 22:31:05.289161 136984945219328 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0 I0418 22:31:05.298130 137114082010944 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.277234s I0418 22:31:05.298847 137114082010944 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 5.357 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28794074058532715 s) (per-host) I0418 22:31:05.298907 137114082010944 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.288033s (batch_requests_ready=0.003052s, total_serialization_initiated=0.284364s, others=0.000618s) I0418 22:31:05.298985 137114082010944 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.292011s (all_items=0.000017s, per_item={'items': '0.00001717'}, temp_paths=0.291993) I0418 22:31:05.299773 137114082010944 event_tracking.py:125] [process=0] [async] Finished blocking save in 1.04 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0. I0418 22:31:05.300047 136984953612032 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 22:51:05.300020 I0418 22:31:05.308793 137114082010944 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0418 22:31:05.309083 136982902589184 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0418 22:31:05.309240 137114082010944 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776551464.256019, 'wait_for_prev_duration_secs': 6.175041198730469e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776551464.2576942, 'checkpointer_blocking_duration_secs': 1.0424721240997314, 'get_old_steps_start_time': 1776551465.300192, 'get_old_steps_duration_secs': 2.7179718017578125e-05, 'checkpoint_manager_blocking_start_time': 1776551464.253603, 'checkpoint_manager_blocking_duration_secs': 1.0555987358093262} I0418 22:31:05.309359 137114082010944 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0418 22:31:05.309430 137114082010944 max_utils.py:750] Memstats: After params initialized: I0418 22:31:05.309481 137114082010944 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_0(process=0,(0,0,0,0)) I0418 22:31:05.309515 137114082010944 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_1(process=0,(1,0,0,0)) I0418 22:31:05.309542 137114082010944 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_4(process=0,(0,1,0,0)) I0418 22:31:05.309569 137114082010944 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_5(process=0,(1,1,0,0)) I0418 22:31:05.663582 137114082010944 metric_logger.py:196] completed step: 0, seconds: 11.091, TFLOP/s/device: 1.225, Tokens/s/device: 184.652, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0418 22:31:05.666706 137114082010944 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/tensorboard/' I0418 22:31:06.076966 137114082010944 metric_logger.py:196] completed step: 1, seconds: 1.559, TFLOP/s/device: 8.716, Tokens/s/device: 1313.817, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0418 22:31:06.218843 137114082010944 metric_logger.py:196] completed step: 2, seconds: 0.414, TFLOP/s/device: 32.789, Tokens/s/device: 4942.264, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0418 22:31:06.366801 137114082010944 metric_logger.py:196] completed step: 3, seconds: 0.013, TFLOP/s/device: 1076.208, Tokens/s/device: 162217.822, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0418 22:31:07.288643 136984928433920 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0/items I0418 22:31:07.323310 136980771890944 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776551466882450158, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776551466882450158, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0418 22:31:08.410595 2841 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0418 22:31:10.345023 136983429244672 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0/items/array_metadatas/process_0 I0418 22:31:28.739762 137114082010944 metric_logger.py:196] completed step: 4, seconds: 0.143, TFLOP/s/device: 94.840, Tokens/s/device: 14295.387, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0418 22:31:28.750136 137114082010944 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.199, Tokens/s/device: 13897.183, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0418 22:31:28.894906 137114082010944 metric_logger.py:196] completed step: 6, seconds: 22.371, TFLOP/s/device: 0.607, Tokens/s/device: 91.546, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0418 22:31:29.042590 137114082010944 metric_logger.py:196] completed step: 7, seconds: 0.008, TFLOP/s/device: 1717.281, Tokens/s/device: 258847.321, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0418 22:31:29.190198 137114082010944 metric_logger.py:196] completed step: 8, seconds: 0.146, TFLOP/s/device: 92.877, Tokens/s/device: 13999.494, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0418 22:31:29.338339 137114082010944 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0418 22:31:29.339035 137114082010944 checkpointing.py:798] Waited 0.0007109642028808594 seconds for step 9 to finish before starting checkpointing. I0418 22:31:29.341040 137114082010944 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0418 22:31:45.477255 136982948738816 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 37.081674s (commit=35.870882s, array_metadata_write=1.210792s) I0418 22:31:45.478280 136984953612032 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 39.034 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.46735644340515 s) (per-host) I0418 22:31:45.478404 136984953612032 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.178265s. I0418 22:31:46.662263 136984953612032 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776551466882450158, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0418 22:31:47.420718 136980771890944 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776551466882450158, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0418 22:31:47.798937 136984953612032 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000488s. I0418 22:31:48.064674 136984953612032 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0418 22:31:48.976744 136984953612032 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 2.190557s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0/items I0418 22:31:48.978500 136984953612032 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0/items I0418 22:31:49.930315 136984953612032 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0 I0418 22:31:51.762228 136984953612032 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0`. I0418 22:31:51.763064 136984953612032 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 47.51 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/0 I0418 22:31:51.764791 136984953612032 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 46.464649s. I0418 22:31:51.765021 136982902589184 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0418 22:31:51.765139 136982902589184 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0418 22:31:51.765213 136982902589184 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0418 22:31:51.767950 136982902589184 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0418 22:31:51.768132 137114082010944 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0418 22:31:51.768271 137114082010944 checkpoint_manager.py:1452] Waiting for previous save to complete took 22.427229 seconds. If this number is high, consider checkpointing less frequently. I0418 22:31:51.770448 137114082010944 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 9 I0418 22:31:51.772398 137114082010944 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9. I0418 22:31:52.482465 137114082010944 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0418 22:31:52.482560 137114082010944 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 I0418 22:31:52.510595 137114082010944 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.029517s I0418 22:31:52.511480 137114082010944 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 40.313 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03826546669006348 s) (per-host) I0418 22:31:52.511563 137114082010944 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038368s (batch_requests_ready=0.002635s, total_serialization_initiated=0.034924s, others=0.000809s) I0418 22:31:52.511656 137114082010944 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.042293s (all_items=0.000023s, per_item={'items': '0.00002289'}, temp_paths=0.042270) I0418 22:31:52.512404 137114082010944 event_tracking.py:125] [process=0] [async] Finished blocking save in 0.74 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9. I0418 22:31:52.512680 136982902589184 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 22:51:52.512648 I0418 22:31:52.517978 137114082010944 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0418 22:31:52.518244 136983429244672 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0418 22:31:52.518381 137114082010944 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776551489.3410087, 'wait_for_prev_duration_secs': 22.427229166030884, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776551511.7704866, 'checkpointer_blocking_duration_secs': 0.7423386573791504, 'get_old_steps_start_time': 1776551512.512851, 'get_old_steps_duration_secs': 2.9325485229492188e-05, 'checkpoint_manager_blocking_start_time': 1776551489.3392553, 'checkpoint_manager_blocking_duration_secs': 23.179091453552246} I0418 22:31:52.518515 137114082010944 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0418 22:31:52.518563 137114082010944 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0418 22:31:52.723770 136984953612032 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9 I0418 22:31:54.892628 136979152885504 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9/items I0418 22:31:58.639660 136984007890688 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9/items/array_metadatas/process_0 I0418 22:32:38.949049 136983447435008 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 42.516305s (commit=40.887919s, array_metadata_write=1.628386s) I0418 22:32:38.950225 136982902589184 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 33.987 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 46.47698378562927 s) (per-host) I0418 22:32:38.950356 136982902589184 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 46.437567s. I0418 22:32:40.586976 136982902589184 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0418 22:32:40.755834 136982902589184 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000412s. I0418 22:32:41.624247 136982902589184 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.895305s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9/items I0418 22:32:41.626001 136982902589184 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9/items I0418 22:32:42.152403 136982902589184 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9 I0418 22:32:43.558916 136982902589184 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9`. I0418 22:32:43.559760 136982902589184 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 51.79 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260418_204152_07_eval/checkpoints/9 I0418 22:32:43.561239 136982902589184 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 51.048446s. I0418 22:32:43.561371 136983429244672 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0418 22:32:43.561433 136983429244672 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0418 22:32:43.561498 136983429244672 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0418 22:32:43.563776 136983429244672 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0418 22:32:43.563911 137114082010944 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0418 22:32:43.564023 137114082010944 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0418 22:32:43.564937 137114082010944 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.098, Tokens/s/device: 13882.016, 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: Sat Apr 18 22:32:52 UTC 2026 EXIT_CODE=0