XPK Start: Mon Apr 20 14:07:56 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 14:08:20.891408: 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 14:08:21.069354 138117372331840 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 14:08:30.110406 138117372331840 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 14:08:30.112668 138117372331840 distributed.py:172] Connecting to JAX distributed service on mt-07-eval-mi6g8-slice-job-0-0.mt-07-eval-mi6g8:8482 I0420 14:08:31.700856 138117372331840 max_utils.py:284] Jax distributed system initialized! I0420 14:08:37.734250 138117372331840 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 14:08:37.734351 138117372331840 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 14:08:37.734390 138117372331840 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 14:08:37.734424 138117372331840 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 14:08:38.776978 138117372331840 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 14:08:38.890109 138117372331840 checkpointing.py:688] Setting up checkpoint logger... I0420 14:08:38.890217 138117372331840 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 14:08:38.890261 138117372331840 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 14:08:38.890459 138117372331840 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 0x7d9d5b7177a0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 14:08:41.588484 138117372331840 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 14:08:41.588753 138117372331840 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 0x7d8974284d70>}, handler_registry=None I0420 14:08:41.588996 138117372331840 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d8974284d70>` 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 14:08:41.589043 138117372331840 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d89742fc8f0>` 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 14:08:41.589076 138117372331840 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 0x7d8974284d70>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d8974284d70>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d89742fc8f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d89742fc8f0>}). I0420 14:08:41.589403 138117372331840 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 14:08:41.589473 138117372331840 async_checkpointer.py:192] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d89741645e0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 14:08:42.759695 138117372331840 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints I0420 14:08:43.090648 138117372331840 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_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d9c30f70e00> I0420 14:08:43.090819 138117372331840 checkpointing.py:302] Checkpoint manager created! I0420 14:08:44.041787 138117372331840 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 14:08:44.041904 138117372331840 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 14:08:45.404610 138117372331840 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0420 14:08:45.404722 138117372331840 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 14:08:45.404774 138117372331840 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 14:08:45.404817 138117372331840 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0420 14:08:45.404861 138117372331840 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 14:08:45.404897 138117372331840 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 14:08:45.404933 138117372331840 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 14:08:45.404968 138117372331840 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0420 14:08:45.405003 138117372331840 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 14:08:45.405035 138117372331840 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 14:08:45.405067 138117372331840 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0420 14:08:45.405112 138117372331840 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0420 14:08:45.807192 138117372331840 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 14:08:45.807282 138117372331840 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 14:08:45.813609 138117372331840 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 14:08:45.813668 138117372331840 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 14:08:45.829922 138117372331840 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 14:08:45.829984 138117372331840 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 14:08:45.845724 138117372331840 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 14:08:45.845780 138117372331840 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 14:08:45.874760 138117372331840 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 14:08:45.874855 138117372331840 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 14:08:45.890472 138117372331840 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 14:08:45.890532 138117372331840 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 14:08:45.906167 138117372331840 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 14:08:45.906226 138117372331840 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 14:08:45.935870 138117372331840 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 14:08:45.935942 138117372331840 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 14:08:45.956423 138117372331840 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 14:08:45.956488 138117372331840 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 14:08:57.320969 138117372331840 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 14:08:57.330459 138117372331840 metric_logger.py:301] number parameters: 1.104 billion I0420 14:09:08.807531 138117372331840 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 14:09:08.959690 138117372331840 checkpointing.py:798] Waited 0.1521446704864502 seconds for step 0 to finish before starting checkpointing. I0420 14:09:08.962117 138117372331840 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 14:09:08.963810 138117372331840 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 0 I0420 14:09:08.965796 138117372331840 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0. I0420 14:09:09.725207 138117372331840 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 14:09:09.744930 138117372331840 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 14:09:09.745001 138117372331840 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 14:09:09.985714 137989581698816 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0 I0420 14:09:10.017148 138117372331840 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.273618s I0420 14:09:10.017977 138117372331840 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 5.418 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2847111225128174 s) (per-host) I0420 14:09:10.018035 138117372331840 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.284787s (batch_requests_ready=0.003156s, total_serialization_initiated=0.280888s, others=0.000743s) I0420 14:09:10.018118 138117372331840 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.288790s (all_items=0.000017s, per_item={'items': '0.00001740'}, temp_paths=0.288772) I0420 14:09:10.018894 138117372331840 event_tracking.py:125] [process=0] [async] Finished blocking save in 1.05 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0. I0420 14:09:10.019243 137990065293056 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 14:29:10.019207 I0420 14:09:10.031397 138117372331840 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 14:09:10.031692 137986360473344 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 14:09:10.031850 138117372331840 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776694148.962097, 'wait_for_prev_duration_secs': 6.508827209472656e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776694148.963851, 'checkpointer_blocking_duration_secs': 1.0555446147918701, 'get_old_steps_start_time': 1776694150.0194206, 'get_old_steps_duration_secs': 2.9325485229492188e-05, 'checkpoint_manager_blocking_start_time': 1776694148.9601076, 'checkpoint_manager_blocking_duration_secs': 1.071704626083374} I0420 14:09:10.031965 138117372331840 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 14:09:10.032033 138117372331840 max_utils.py:750] Memstats: After params initialized: I0420 14:09:10.032099 138117372331840 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_0(process=0,(0,0,0,0)) I0420 14:09:10.032135 138117372331840 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_1(process=0,(1,0,0,0)) I0420 14:09:10.032166 138117372331840 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_4(process=0,(0,1,0,0)) I0420 14:09:10.032189 138117372331840 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_5(process=0,(1,1,0,0)) I0420 14:09:10.378633 138117372331840 metric_logger.py:196] completed step: 0, seconds: 11.141, TFLOP/s/device: 1.220, Tokens/s/device: 183.826, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 14:09:10.381893 138117372331840 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/tensorboard/' I0420 14:09:10.811493 138117372331840 metric_logger.py:196] completed step: 1, seconds: 1.567, TFLOP/s/device: 8.669, Tokens/s/device: 1306.645, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0420 14:09:10.953404 138117372331840 metric_logger.py:196] completed step: 2, seconds: 0.434, TFLOP/s/device: 31.321, Tokens/s/device: 4721.004, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28632.133 I0420 14:09:11.101215 138117372331840 metric_logger.py:196] completed step: 3, seconds: 0.013, TFLOP/s/device: 1036.948, Tokens/s/device: 156300.084, total_weights: 65536, loss: 9.732, lm_loss: 9.732, perplexity: 16855.789 I0420 14:09:11.872271 137989564913408 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0/items I0420 14:09:12.060894 137986305472256 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776694151599475395, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776694151599475395, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0420 14:09:13.037270 2824 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 14:09:14.858706 137987971086080 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_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0/items/array_metadatas/process_0 I0420 14:09:33.223071 138117372331840 metric_logger.py:196] completed step: 4, seconds: 0.143, TFLOP/s/device: 95.057, Tokens/s/device: 14327.991, total_weights: 65536, loss: 9.274, lm_loss: 9.274, perplexity: 10661.594 I0420 14:09:33.234678 138117372331840 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.246, Tokens/s/device: 13904.259, total_weights: 65536, loss: 8.888, lm_loss: 8.888, perplexity: 7245.978 I0420 14:09:33.379045 138117372331840 metric_logger.py:196] completed step: 6, seconds: 22.121, TFLOP/s/device: 0.614, Tokens/s/device: 92.581, total_weights: 65536, loss: 8.589, lm_loss: 8.589, perplexity: 5371.156 I0420 14:09:33.526582 138117372331840 metric_logger.py:196] completed step: 7, seconds: 0.009, TFLOP/s/device: 1527.845, Tokens/s/device: 230293.489, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4360.465 I0420 14:09:33.674416 138117372331840 metric_logger.py:196] completed step: 8, seconds: 0.146, TFLOP/s/device: 93.277, Tokens/s/device: 14059.657, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.256 I0420 14:09:33.822534 138117372331840 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 14:09:33.823239 138117372331840 checkpointing.py:798] Waited 0.0007183551788330078 seconds for step 9 to finish before starting checkpointing. I0420 14:09:33.825283 138117372331840 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 14:09:50.588393 137987962693376 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 37.558626s (commit=35.858503s, array_metadata_write=1.700123s) I0420 14:09:50.589588 137990065293056 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 38.662 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.856266498565674 s) (per-host) I0420 14:09:50.589720 137990065293056 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.570363s. I0420 14:09:51.365251 137990065293056 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776694151599475395, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0420 14:09:52.124168 137990065293056 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000476s. I0420 14:09:52.203286 137986305472256 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776694151599475395, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0/_CHECKPOINT_METADATA I0420 14:09:52.371683 137990065293056 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0420 14:09:53.471510 137990065293056 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.983618s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0/items I0420 14:09:53.473284 137990065293056 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0/items I0420 14:09:53.999690 137990065293056 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0 I0420 14:09:55.827925 137990065293056 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_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0`. I0420 14:09:55.830353 137990065293056 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 46.87 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/0 I0420 14:09:55.831933 137990065293056 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 45.812572s. I0420 14:09:55.832170 137986360473344 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 14:09:55.832288 137986360473344 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 14:09:55.832356 137986360473344 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 14:09:55.834676 137986360473344 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 14:09:55.834817 138117372331840 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. W0420 14:09:55.834907 138117372331840 checkpoint_manager.py:1452] Waiting for previous save to complete took 22.009625 seconds. If this number is high, consider checkpointing less frequently. I0420 14:09:55.836961 138117372331840 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 9 I0420 14:09:55.839113 138117372331840 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9. I0420 14:09:56.574142 138117372331840 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0420 14:09:56.574235 138117372331840 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 14:09:56.601720 138117372331840 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.029102s I0420 14:09:56.602499 138117372331840 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 40.804 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03780484199523926 s) (per-host) I0420 14:09:56.602560 138117372331840 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.037882s (batch_requests_ready=0.002673s, total_serialization_initiated=0.034524s, others=0.000685s) I0420 14:09:56.602640 138117372331840 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.041965s (all_items=0.000016s, per_item={'items': '0.00001645'}, temp_paths=0.041949) I0420 14:09:56.603389 138117372331840 event_tracking.py:125] [process=0] [async] Finished blocking save in 0.77 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9. I0420 14:09:56.603729 137986360473344 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 14:29:56.603692 I0420 14:09:56.616013 138117372331840 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 14:09:56.616295 137987962693376 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 14:09:56.616460 138117372331840 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776694173.8252516, 'wait_for_prev_duration_secs': 22.00962471961975, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776694195.8370004, 'checkpointer_blocking_duration_secs': 0.7668752670288086, 'get_old_steps_start_time': 1776694196.603898, 'get_old_steps_duration_secs': 3.266334533691406e-05, 'checkpoint_manager_blocking_start_time': 1776694173.8234663, 'checkpoint_manager_blocking_duration_secs': 22.792959213256836} I0420 14:09:56.616584 138117372331840 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 14:09:56.616628 138117372331840 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 14:09:56.809171 137990065293056 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9 I0420 14:09:58.610315 137989036435200 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9/items I0420 14:10:02.491509 137988464744192 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_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9/items/array_metadatas/process_0 I0420 14:10:43.139585 137987971086080 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 43.332650s (commit=42.097875s, array_metadata_write=1.234775s) I0420 14:10:43.140938 137986360473344 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 33.914 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 46.5761992931366 s) (per-host) I0420 14:10:43.141061 137986360473344 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 46.537218s. I0420 14:10:44.671906 137986360473344 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000410s. I0420 14:10:44.834333 137986360473344 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0420 14:10:45.802123 137986360473344 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.840846s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9/items I0420 14:10:45.806766 137986360473344 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9/items I0420 14:10:46.363859 137986360473344 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9 I0420 14:10:47.810135 137986360473344 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_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9`. I0420 14:10:47.810985 137986360473344 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 51.97 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_07_eval/checkpoints/9 I0420 14:10:47.812570 137986360473344 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 51.208725s. I0420 14:10:47.812734 137987962693376 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 14:10:47.812830 137987962693376 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 14:10:47.812924 137987962693376 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 14:10:47.814533 137987962693376 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 14:10:47.814680 138117372331840 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. I0420 14:10:47.814790 138117372331840 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 14:10:47.815704 138117372331840 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.344, Tokens/s/device: 13919.095, 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 14:10:57 UTC 2026 EXIT_CODE=0