XPK Start: Sun Apr 19 04:59:14 UTC 2026 2026-04-19 04:59:18.285046: E external/local_xla/xla/stream_executor/cuda/cuda_fft.cc:467] Unable to register cuFFT factory: Attempting to register factory for plugin cuFFT when one has already been registered WARNING: All log messages before absl::InitializeLog() is called are written to STDERR E0000 00:00:1776574758.297419 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776574758.301203 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776574758.312343 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776574758.312363 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776574758.312365 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776574758.312367 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-19 04:59:37.458749: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0419 04:59:37.990556 132540212778816 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-19 04:59:47,030:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0419 04:59:47.030530 132540212778816 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-19 04:59:47,032:jax._src.distributed:157: Connecting to JAX distributed service on mt-02-synthetic-tj2y8-slice-job-0-0.mt-02-synthetic-tj2y8:8482 I0419 04:59:47.032905 132540212778816 distributed.py:157] Connecting to JAX distributed service on mt-02-synthetic-tj2y8-slice-job-0-0.mt-02-synthetic-tj2y8:8482 I0419 04:59:48.914491 132540212778816 max_utils.py:284] Jax distributed system initialized! I0419 04:59:55.747631 132540212778816 max_utils.py:800] System Information: Jax Version: 0.8.1 I0419 04:59:55.747739 132540212778816 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0419 04:59:55.747780 132540212778816 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709 I0419 04:59:55.747815 132540212778816 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0419 04:59:56.364531 132540212778816 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0419 04:59:56.479824 132540212778816 checkpointing.py:688] Setting up checkpoint logger... I0419 04:59:56.479951 132540212778816 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0419 04:59:56.479997 132540212778816 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0419 04:59:56.480203 132540212778816 base_pytree_checkpoint_handler.py:415] 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 0x788ae5755e50>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0419 05:00:00.733654 132540212778816 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0419 05:00:00.734008 132540212778816 checkpoint_manager.py:709] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7877d32d4fe0>}, handler_registry=None I0419 05:00:00.734264 132540212778816 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7877d32d4fe0>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0419 05:00:00.734314 132540212778816 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7877d32d4da0>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0419 05:00:00.734351 132540212778816 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 0x7877d32d4fe0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7877d32d4fe0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7877d32d4da0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7877d32d4da0>}). I0419 05:00:00.734678 132540212778816 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0419 05:00:00.734754 132540212778816 async_checkpointer.py:177] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7877d0ad0f40> timeout: 600 secs and primary_host=0 for async checkpoint writes I0419 05:00:03.421878 132540212778816 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints I0419 05:00:03.890930 132540212778816 checkpoint_manager.py:929] [process=3][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_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7877d13c8d70> I0419 05:00:03.891110 132540212778816 checkpointing.py:302] Checkpoint manager created! I0419 05:00:04.820084 132540212778816 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0419 05:00:04.820207 132540212778816 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0419 05:00:06.220580 132540212778816 maxtext_utils.py:1749] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0419 05:00:06.220711 132540212778816 maxtext_utils.py:1749] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0419 05:00:06.220767 132540212778816 maxtext_utils.py:1749] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0419 05:00:06.220812 132540212778816 maxtext_utils.py:1749] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0419 05:00:06.220851 132540212778816 maxtext_utils.py:1749] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0419 05:00:06.220886 132540212778816 maxtext_utils.py:1749] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0419 05:00:06.220924 132540212778816 maxtext_utils.py:1749] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 05:00:06.220962 132540212778816 maxtext_utils.py:1749] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0419 05:00:06.220999 132540212778816 maxtext_utils.py:1749] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 05:00:06.221034 132540212778816 maxtext_utils.py:1749] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0419 05:00:06.221068 132540212778816 maxtext_utils.py:1749] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0419 05:00:06.221101 132540212778816 maxtext_utils.py:1749] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0419 05:00:06.621770 132540212778816 nnx_decoders.py:616] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 05:00:06.621936 132540212778816 nnx_decoders.py:616] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 05:00:06.627362 132540212778816 nnx_decoders.py:616] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 05:00:06.627463 132540212778816 nnx_decoders.py:616] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 05:00:06.783345 132540212778816 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 05:00:06.783480 132540212778816 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 05:00:06.943272 132540212778816 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 05:00:06.943409 132540212778816 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 05:00:07.113028 132540212778816 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 05:00:07.113176 132540212778816 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 05:00:07.269972 132540212778816 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 05:00:07.270116 132540212778816 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 05:00:07.427519 132540212778816 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 05:00:07.427660 132540212778816 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 05:00:07.594815 132540212778816 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0419 05:00:07.594962 132540212778816 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 05:00:07.617806 132540212778816 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0419 05:00:07.617906 132540212778816 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0419 05:00:18.729788 132540212778816 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0419 05:00:18.732134 132540212778816 metric_logger.py:289] number parameters: 1.104 billion I0419 05:00:29.858728 132540212778816 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0419 05:00:30.009023 132540212778816 checkpointing.py:798] Waited 0.1502833366394043 seconds for step 0 to finish before starting checkpointing. I0419 05:00:30.011529 132540212778816 checkpoint_manager.py:2013] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 05:00:30.013437 132540212778816 checkpoint_manager.py:1518] [process=3] Saving checkpoint at step 0 I0419 05:00:30.016403 132540212778816 async_checkpointer.py:452] [process=3] Started async saving checkpoint to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints/0. I0419 05:00:31.447193 132540212778816 signaling_client.py:364] Using JaxDistributedSignalingClient I0419 05:00:31.448273 132540212778816 jax_array_handlers.py:358] Scheduling D2H of 69 prioritized jax.Array. I0419 05:00:31.448330 132540212778816 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0419 05:00:31.694811 132540212778816 base_pytree_checkpoint_handler.py:153] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.248749s I0419 05:00:31.694990 132540212778816 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.057 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.504608154296875 s) (per-host) I0419 05:00:31.695043 132540212778816 base_pytree_checkpoint_handler.py:737] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.504671s (batch_requests_ready=0.249282s, total_serialization_initiated=0.255317s, others=0.000072s) I0419 05:00:31.695144 132540212778816 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.508784s (all_items=0.000020s, per_item={'items': '0.00001955'}, temp_paths=0.508765) I0419 05:00:31.696137 132418287671040 async_checkpointer.py:79] [process=3][thread=async_save] Background save thread started. I0419 05:00:31.696261 132540212778816 async_checkpointer.py:561] Finished blocking save. Time taken: 1.682739s. Continuing background save to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints/0. I0419 05:00:32.140397 132540212778816 checkpoint_manager.py:1566] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0419 05:00:32.140789 132414579930880 async_checkpointer.py:265] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0419 05:00:32.140951 132540212778816 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776574830.011497, 'wait_for_prev_duration_secs': 0.00012731552124023438, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776574830.0134766, 'checkpointer_blocking_duration_secs': 1.6828949451446533, 'get_old_steps_start_time': 1776574831.6963937, 'get_old_steps_duration_secs': 2.6702880859375e-05, 'checkpoint_manager_blocking_start_time': 1776574830.009518, 'checkpoint_manager_blocking_duration_secs': 2.1313905715942383} I0419 05:00:32.141062 132540212778816 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0419 05:00:32.141135 132540212778816 max_utils.py:750] Memstats: After params initialized: I0419 05:00:32.141192 132540212778816 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0)) I0419 05:00:32.141225 132540212778816 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0)) I0419 05:00:32.141266 132540212778816 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0)) I0419 05:00:32.141292 132540212778816 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0)) I0419 05:00:32.405157 132540212778816 metric_logger.py:185] completed step: 0, seconds: 11.126, TFLOP/s/device: 1.221, Tokens/s/device: 184.081, total_weights: 65536, loss: 10.874 I0419 05:00:32.580580 132540212778816 metric_logger.py:185] completed step: 1, seconds: 2.545, TFLOP/s/device: 5.339, Tokens/s/device: 804.815, total_weights: 65536, loss: 10.874 I0419 05:00:32.990377 132540212778816 metric_logger.py:185] completed step: 2, seconds: 0.029, TFLOP/s/device: 461.269, Tokens/s/device: 69527.431, total_weights: 65536, loss: 10.262 I0419 05:00:33.137994 132540212778816 metric_logger.py:185] completed step: 3, seconds: 0.401, TFLOP/s/device: 33.906, Tokens/s/device: 5110.660, total_weights: 65536, loss: 9.732 I0419 05:00:33.433907 132540212778816 metric_logger.py:185] completed step: 4, seconds: 0.163, TFLOP/s/device: 83.338, Tokens/s/device: 12561.566, total_weights: 65536, loss: 9.274 I0419 05:00:33.441374 132540212778816 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.157, Tokens/s/device: 13890.961, total_weights: 65536, loss: 8.888 I0419 05:00:53.011213 132540212778816 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.857, Tokens/s/device: 6912.054, total_weights: 65536, loss: 8.589 I0419 05:00:53.158769 132540212778816 metric_logger.py:185] completed step: 7, seconds: 19.424, TFLOP/s/device: 0.700, Tokens/s/device: 105.439, total_weights: 65536, loss: 8.380 I0419 05:00:53.306481 132540212778816 metric_logger.py:185] completed step: 8, seconds: 0.154, TFLOP/s/device: 88.480, Tokens/s/device: 13336.633, total_weights: 65536, loss: 8.251 I0419 05:00:53.455291 132540212778816 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0419 05:00:53.455911 132540212778816 checkpointing.py:798] Waited 0.00063323974609375 seconds for step 9 to finish before starting checkpointing. I0419 05:00:53.457828 132540212778816 checkpoint_manager.py:2024] [process=3][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 05:00:55.330015 2756 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0419 05:00:58.954433 132418296063744 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints/0/items/array_metadatas/process_3 I0419 05:01:29.145472 132418287671040 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/gbytes_per_sec: 27.256 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 57.955047607421875 s) (per-host) I0419 05:01:29.145594 132418287671040 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 57.449394s. I0419 05:01:40.318725 132418287671040 async_checkpointer.py:144] [process=3][thread=async_save] Background save thread done. Time taken: 68.622511s. I0419 05:01:40.319049 132414579930880 async_checkpointer.py:273] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 05:01:40.319167 132414579930880 async_checkpointer.py:283] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0419 05:01:40.319218 132414579930880 checkpoint_manager.py:2133] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0419 05:01:40.333133 132414579930880 checkpoint_manager.py:2142] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0419 05:01:40.333343 132540212778816 checkpoint_manager.py:2036] [process=3][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0419 05:01:40.333492 132540212778816 checkpoint_manager.py:1458] Waiting for previous save to complete took 46.875668 seconds. If this number is high, consider checkpointing less frequently. I0419 05:01:40.335438 132540212778816 checkpoint_manager.py:1518] [process=3] Saving checkpoint at step 9 I0419 05:01:40.338804 132540212778816 async_checkpointer.py:452] [process=3] Started async saving checkpoint to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints/9. I0419 05:01:41.355080 132540212778816 jax_array_handlers.py:358] Scheduling D2H of 69 prioritized jax.Array. I0419 05:01:41.355253 132540212778816 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0419 05:01:41.401386 132540212778816 base_pytree_checkpoint_handler.py:153] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.048377s I0419 05:01:41.401558 132540212778816 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.786 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3222792148590088 s) (per-host) I0419 05:01:41.401611 132540212778816 base_pytree_checkpoint_handler.py:737] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.322340s (batch_requests_ready=0.269252s, total_serialization_initiated=0.053019s, others=0.000069s) I0419 05:01:41.401704 132540212778816 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.326463s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.326447) I0419 05:01:41.402558 132414535137024 async_checkpointer.py:79] [process=3][thread=async_save] Background save thread started. I0419 05:01:41.402720 132540212778816 async_checkpointer.py:561] Finished blocking save. Time taken: 1.067211s. Continuing background save to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints/9. I0419 05:01:41.826541 132540212778816 checkpoint_manager.py:1566] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0419 05:01:41.826913 132414579930880 async_checkpointer.py:265] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0419 05:01:41.827081 132540212778816 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776574853.4577987, 'wait_for_prev_duration_secs': 46.87566781044006, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776574900.335476, 'checkpointer_blocking_duration_secs': 1.067354440689087, 'get_old_steps_start_time': 1776574901.4028492, 'get_old_steps_duration_secs': 2.6226043701171875e-05, 'checkpoint_manager_blocking_start_time': 1776574853.4561303, 'checkpoint_manager_blocking_duration_secs': 48.37091279029846} I0419 05:01:41.827204 132540212778816 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0419 05:01:41.827265 132540212778816 checkpoint_manager.py:2024] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 05:01:50.056725 132418296063744 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260419_025828/nnx_xpk_feat_nnx_set_defaults_true_20260419_025828_02_synthetic/checkpoints/9/items/array_metadatas/process_3 I0419 05:02:25.406258 132414535137024 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/gbytes_per_sec: 35.635 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 44.32692503929138 s) (per-host) I0419 05:02:25.406377 132414535137024 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 44.003706s. I0419 05:02:34.761058 132414535137024 async_checkpointer.py:144] [process=3][thread=async_save] Background save thread done. Time taken: 53.358371s. I0419 05:02:34.761273 132414579930880 async_checkpointer.py:273] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 05:02:34.761336 132414579930880 async_checkpointer.py:283] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0419 05:02:34.761381 132414579930880 checkpoint_manager.py:2133] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0419 05:02:34.763900 132414579930880 checkpoint_manager.py:2142] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0419 05:02:34.764060 132540212778816 checkpoint_manager.py:2036] [process=3][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0419 05:02:34.764257 132540212778816 checkpoint_manager.py:2013] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 05:02:34.764930 132540212778816 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.318, Tokens/s/device: 13915.218, total_weights: 65536, loss: 8.175 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Sun Apr 19 05:02:44 UTC 2026 EXIT_CODE=0