XPK Start: Wed Apr 22 17:38:02 UTC 2026 2026-04-22 17:38:06.849813: 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 00:00:1776879486.862922 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776879486.866644 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776879486.878167 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776879486.878186 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776879486.878189 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776879486.878191 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-22 17:38:26.120261: 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) I0422 17:38:26.649775 135724468913984 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-22 17:38:35,691:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0422 17:38:35.691140 135724468913984 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-22 17:38:35,693:jax._src.distributed:157: Connecting to JAX distributed service on mt-04-int8-u9sv6-slice-job-0-0.mt-04-int8-u9sv6:8482 I0422 17:38:35.693504 135724468913984 distributed.py:157] Connecting to JAX distributed service on mt-04-int8-u9sv6-slice-job-0-0.mt-04-int8-u9sv6:8482 I0422 17:38:36.801652 135724468913984 max_utils.py:284] Jax distributed system initialized! I0422 17:38:43.753176 135724468913984 max_utils.py:800] System Information: Jax Version: 0.8.1 I0422 17:38:43.753286 135724468913984 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0422 17:38:43.753328 135724468913984 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 I0422 17:38:43.753363 135724468913984 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0422 17:38:44.380558 135724468913984 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0422 17:38:44.935522 135724468913984 checkpointing.py:688] Setting up checkpoint logger... I0422 17:38:44.935640 135724468913984 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0422 17:38:44.935684 135724468913984 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0422 17:38:44.935906 135724468913984 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 0x7b704ef754f0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0422 17:38:47.885860 135724468913984 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0422 17:38:47.886255 135724468913984 checkpoint_manager.py:709] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b5b3c25c110>}, handler_registry=None I0422 17:38:47.886499 135724468913984 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b5b3c25c110>` 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`. I0422 17:38:47.886550 135724468913984 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b5b3c30ef60>` 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`. I0422 17:38:47.886587 135724468913984 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 0x7b5b3c25c110>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b5b3c25c110>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b5b3c30ef60>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b5b3c30ef60>}). I0422 17:38:47.886957 135724468913984 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0422 17:38:47.887037 135724468913984 async_checkpointer.py:177] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b5b3c5a8cc0> timeout: 600 secs and primary_host=0 for async checkpoint writes I0422 17:38:48.986090 135724468913984 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints I0422 17:38:49.050729 135724468913984 checkpoint_manager.py:929] [process=4][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_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b5b3c30d6a0> I0422 17:38:49.050907 135724468913984 checkpointing.py:302] Checkpoint manager created! I0422 17:38:50.501189 135724468913984 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0422 17:38:50.501310 135724468913984 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0422 17:38:52.846992 135724468913984 maxtext_utils.py:1749] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0422 17:38:52.847115 135724468913984 maxtext_utils.py:1749] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0422 17:38:52.847170 135724468913984 maxtext_utils.py:1749] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0422 17:38:52.847215 135724468913984 maxtext_utils.py:1749] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0422 17:38:52.847254 135724468913984 maxtext_utils.py:1749] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0422 17:38:52.847291 135724468913984 maxtext_utils.py:1749] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0422 17:38:52.847327 135724468913984 maxtext_utils.py:1749] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0422 17:38:52.847364 135724468913984 maxtext_utils.py:1749] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0422 17:38:52.847400 135724468913984 maxtext_utils.py:1749] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0422 17:38:52.847434 135724468913984 maxtext_utils.py:1749] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0422 17:38:52.847468 135724468913984 maxtext_utils.py:1749] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0422 17:38:52.847501 135724468913984 maxtext_utils.py:1749] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0422 17:38:53.255295 135724468913984 nnx_decoders.py:616] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0422 17:38:53.255457 135724468913984 nnx_decoders.py:616] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0422 17:38:53.260882 135724468913984 nnx_decoders.py:616] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0422 17:38:53.260983 135724468913984 nnx_decoders.py:616] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0422 17:38:53.415255 135724468913984 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0422 17:38:53.415391 135724468913984 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0422 17:38:53.566019 135724468913984 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0422 17:38:53.566152 135724468913984 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0422 17:38:53.769001 135724468913984 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0422 17:38:53.769141 135724468913984 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0422 17:38:53.918844 135724468913984 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0422 17:38:53.918995 135724468913984 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0422 17:38:54.065807 135724468913984 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0422 17:38:54.065954 135724468913984 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0422 17:38:54.224891 135724468913984 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0422 17:38:54.225027 135724468913984 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0422 17:38:54.723176 135724468913984 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0422 17:38:54.723316 135724468913984 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0422 17:39:08.388777 135724468913984 max_utils.py:791] Total memory size: 1.8 GB, Output size: 0.4 GB, Temp size: 1.4 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0422 17:39:08.392517 135724468913984 metric_logger.py:289] number parameters: 1.104 billion I0422 17:39:22.689534 135724468913984 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0422 17:39:22.924227 135724468913984 checkpointing.py:798] Waited 0.2346811294555664 seconds for step 0 to finish before starting checkpointing. I0422 17:39:22.927255 135724468913984 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0422 17:39:22.929067 135724468913984 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 0 I0422 17:39:22.932014 135724468913984 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints/0. I0422 17:39:23.492037 135724468913984 signaling_client.py:364] Using JaxDistributedSignalingClient I0422 17:39:23.493014 135724468913984 jax_array_handlers.py:358] Scheduling D2H of 111 prioritized jax.Array. I0422 17:39:23.493073 135724468913984 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 I0422 17:39:23.739150 135724468913984 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.249534s I0422 17:39:23.739326 135724468913984 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.959 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5212509632110596 s) (per-host) I0422 17:39:23.739381 135724468913984 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.521316s (batch_requests_ready=0.261795s, total_serialization_initiated=0.259449s, others=0.000072s) I0422 17:39:23.739501 135724468913984 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.525522s (all_items=0.000019s, per_item={'items': '0.00001860'}, temp_paths=0.525503) I0422 17:39:23.740616 135594878048000 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0422 17:39:23.740789 135724468913984 async_checkpointer.py:561] Finished blocking save. Time taken: 0.811651s. Continuing background save to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints/0. I0422 17:39:23.875439 135724468913984 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0422 17:39:23.875824 135592234964736 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0422 17:39:23.876008 135724468913984 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776879562.9272377, 'wait_for_prev_duration_secs': 7.033348083496094e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776879562.9291058, 'checkpointer_blocking_duration_secs': 0.8118002414703369, 'get_old_steps_start_time': 1776879563.7409275, 'get_old_steps_duration_secs': 2.5987625122070312e-05, 'checkpoint_manager_blocking_start_time': 1776879562.924705, 'checkpoint_manager_blocking_duration_secs': 0.9512605667114258} I0422 17:39:23.876129 135724468913984 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0422 17:39:23.876212 135724468913984 max_utils.py:750] Memstats: After params initialized: I0422 17:39:23.876268 135724468913984 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0)) I0422 17:39:23.876302 135724468913984 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0)) I0422 17:39:23.876330 135724468913984 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0)) I0422 17:39:23.876353 135724468913984 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0)) I0422 17:39:24.145740 135724468913984 metric_logger.py:185] completed step: 0, seconds: 14.295, TFLOP/s/device: 0.950, Tokens/s/device: 143.265, total_weights: 65536, loss: 10.872 I0422 17:39:24.394409 135724468913984 metric_logger.py:185] completed step: 1, seconds: 1.454, TFLOP/s/device: 9.346, Tokens/s/device: 1408.748, total_weights: 65536, loss: 10.872 I0422 17:39:24.827509 135724468913984 metric_logger.py:185] completed step: 2, seconds: 0.023, TFLOP/s/device: 580.870, Tokens/s/device: 87555.043, total_weights: 65536, loss: 10.258 I0422 17:39:25.056607 135724468913984 metric_logger.py:185] completed step: 3, seconds: 0.415, TFLOP/s/device: 32.720, Tokens/s/device: 4931.862, total_weights: 65536, loss: 9.727 I0422 17:39:25.515567 135724468913984 metric_logger.py:185] completed step: 4, seconds: 0.252, TFLOP/s/device: 53.830, Tokens/s/device: 8113.815, total_weights: 65536, loss: 9.270 I0422 17:39:25.523537 135724468913984 metric_logger.py:185] completed step: 5, seconds: 0.229, TFLOP/s/device: 59.337, Tokens/s/device: 8943.856, total_weights: 65536, loss: 8.884 I0422 17:39:47.413901 135724468913984 metric_logger.py:185] completed step: 6, seconds: 0.459, TFLOP/s/device: 29.605, Tokens/s/device: 4462.457, total_weights: 65536, loss: 8.584 I0422 17:39:47.643062 135724468913984 metric_logger.py:185] completed step: 7, seconds: 21.664, TFLOP/s/device: 0.627, Tokens/s/device: 94.536, total_weights: 65536, loss: 8.376 I0422 17:39:47.872003 135724468913984 metric_logger.py:185] completed step: 8, seconds: 0.235, TFLOP/s/device: 57.870, Tokens/s/device: 8722.726, total_weights: 65536, loss: 8.247 I0422 17:39:48.102936 135724468913984 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0422 17:39:48.103793 135724468913984 checkpointing.py:798] Waited 0.0008695125579833984 seconds for step 9 to finish before starting checkpointing. I0422 17:39:48.105762 135724468913984 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0422 17:39:48.453179 2766 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0422 17:39:50.383551 135594930640640 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 111 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints/0/items/array_metadatas/process_4 I0422 17:40:19.056646 135594878048000 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 28.289 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 55.8385443687439 s) (per-host) I0422 17:40:19.056751 135594878048000 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 55.316024s. I0422 17:40:27.978802 135594878048000 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 64.238058s. I0422 17:40:27.979119 135592234964736 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0422 17:40:27.979251 135592234964736 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0422 17:40:27.979303 135592234964736 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0422 17:40:27.981751 135592234964736 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0422 17:40:27.981995 135724468913984 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0422 17:40:27.982134 135724468913984 checkpoint_manager.py:1458] Waiting for previous save to complete took 39.876374 seconds. If this number is high, consider checkpointing less frequently. I0422 17:40:27.984071 135724468913984 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 9 I0422 17:40:27.987481 135724468913984 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints/9. I0422 17:40:28.974462 135724468913984 jax_array_handlers.py:358] Scheduling D2H of 111 prioritized jax.Array. I0422 17:40:28.974569 135724468913984 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 I0422 17:40:29.016161 135724468913984 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044921s I0422 17:40:29.016332 135724468913984 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.815 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.32033681869506836 s) (per-host) I0422 17:40:29.016386 135724468913984 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.320400s (batch_requests_ready=0.267361s, total_serialization_initiated=0.052969s, others=0.000070s) I0422 17:40:29.016505 135724468913984 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.324466s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.324449) I0422 17:40:29.017311 135594399233792 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0422 17:40:29.017416 135724468913984 async_checkpointer.py:561] Finished blocking save. Time taken: 1.033275s. Continuing background save to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints/9. I0422 17:40:29.035661 135724468913984 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0422 17:40:29.035981 135592234964736 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0422 17:40:29.036146 135724468913984 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776879588.1057348, 'wait_for_prev_duration_secs': 39.87637376785278, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776879627.9841099, 'checkpointer_blocking_duration_secs': 1.033423662185669, 'get_old_steps_start_time': 1776879629.0175529, 'get_old_steps_duration_secs': 2.6464462280273438e-05, 'checkpoint_manager_blocking_start_time': 1776879588.1040812, 'checkpoint_manager_blocking_duration_secs': 40.932029247283936} I0422 17:40:29.036265 135724468913984 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0422 17:40:29.036312 135724468913984 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0422 17:40:33.787706 135594930640640 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 111 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/nnx_xpk_feat_nnx_set_defaults_true_20260422_154647_04_int8/checkpoints/9/items/array_metadatas/process_4 I0422 17:41:10.369290 135594399233792 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 37.904 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.67324471473694 s) (per-host) I0422 17:41:10.369409 135594399233792 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.352037s. I0422 17:41:18.587292 135594399233792 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 49.569904s. I0422 17:41:18.587594 135592234964736 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0422 17:41:18.587778 135592234964736 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0422 17:41:18.587838 135592234964736 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0422 17:41:18.589195 135592234964736 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0422 17:41:18.589385 135724468913984 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0422 17:41:18.589558 135724468913984 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0422 17:41:18.590250 135724468913984 metric_logger.py:185] completed step: 9, seconds: 0.229, TFLOP/s/device: 59.306, Tokens/s/device: 8939.250, total_weights: 65536, loss: 8.171 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Wed Apr 22 17:41:28 UTC 2026 EXIT_CODE=0