XPK Start: Tue Apr 21 01:30:15 UTC 2026 2026-04-21 01:30:19.933747: 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 00:00:1776735019.946479 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776735019.950231 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776735019.961551 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776735019.961571 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776735019.961574 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776735019.961575 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-21 01:30:39.032752: 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) I0421 01:30:39.548457 140639728219968 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-21 01:30:48,590:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0421 01:30:48.590326 140639728219968 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-21 01:30:48,592:jax._src.distributed:157: Connecting to JAX distributed service on mt-11-optimizer-offload-2k6el-slice-job-0-0.mt-11-optimizer-offload-2k6el:8482 I0421 01:30:48.592599 140639728219968 distributed.py:157] Connecting to JAX distributed service on mt-11-optimizer-offload-2k6el-slice-job-0-0.mt-11-optimizer-offload-2k6el:8482 I0421 01:30:49.875068 140639728219968 max_utils.py:284] Jax distributed system initialized! I0421 01:30:56.646463 140639728219968 max_utils.py:800] System Information: Jax Version: 0.8.1 I0421 01:30:56.646570 140639728219968 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0421 01:30:56.646610 140639728219968 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 I0421 01:30:56.646644 140639728219968 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 01:30:57.263751 140639728219968 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 01:30:57.264034 140639728219968 checkpointing.py:677] Setting up checkpoint logger... I0421 01:30:57.264088 140639728219968 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 01:30:57.264132 140639728219968 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0421 01:30:57.264487 140639728219968 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 0x7fe8c8353770>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 01:31:00.138077 140639728219968 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0421 01:31:00.138321 140639728219968 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 0x7fe777b85d60>}, handler_registry=None I0421 01:31:00.138557 140639728219968 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fe777b85d60>` 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`. I0421 01:31:00.138607 140639728219968 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fd57f2defc0>` 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`. I0421 01:31:00.138642 140639728219968 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 0x7fe777b85d60>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fe777b85d60>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fd57f2defc0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fd57f2defc0>}). I0421 01:31:00.139155 140639728219968 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0421 01:31:00.139234 140639728219968 async_checkpointer.py:177] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7fd57dc14040> timeout: 600 secs and primary_host=0 for async checkpoint writes I0421 01:31:02.092967 140639728219968 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints I0421 01:31:02.526802 140639728219968 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/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7fd64cf36d50> I0421 01:31:02.526978 140639728219968 checkpointing.py:301] Checkpoint manager created! I0421 01:31:03.437876 140639728219968 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 01:31:03.437983 140639728219968 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:31:03.811774 140639728219968 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 01:31:03.811869 140639728219968 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:31:03.827532 140639728219968 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 01:31:03.827594 140639728219968 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:31:03.850120 140639728219968 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:31:03.850191 140639728219968 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:31:03.866073 140639728219968 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:31:03.866134 140639728219968 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:31:03.881821 140639728219968 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:31:03.881881 140639728219968 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:31:03.906228 140639728219968 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 01:31:03.906302 140639728219968 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:31:03.925443 140639728219968 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 01:31:03.925509 140639728219968 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 01:31:04.114471 140639728219968 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0421 01:31:04.114583 140639728219968 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 01:31:05.538030 140639728219968 maxtext_utils.py:1501] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0421 01:31:05.538164 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 01:31:05.538219 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 01:31:05.538277 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0421 01:31:05.538328 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0421 01:31:05.538366 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0421 01:31:05.538419 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/self_attention/key/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0421 01:31:05.538471 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/self_attention/out/kernel Shape: float32[16,16,128,2048] Logical: PartitionSpec('heads', 'layers', 'kv', 'embed') Physical: (None, None, None, 'fsdp') I0421 01:31:05.538511 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/self_attention/query/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'q_heads', 'kv') Physical: ('fsdp', None, None, None) I0421 01:31:05.538546 140639728219968 maxtext_utils.py:1501] params/params/decoder/layers/self_attention/value/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0421 01:31:05.538592 140639728219968 maxtext_utils.py:1501] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0421 01:31:05.538638 140639728219968 maxtext_utils.py:1501] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0421 01:31:06.035491 140639728219968 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 01:31:06.035592 140639728219968 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0421 01:31:06.050321 140639728219968 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 01:31:06.050383 140639728219968 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0421 01:31:16.619591 140639728219968 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. I0421 01:31:16.620453 140639728219968 metric_logger.py:289] number parameters: 1.104 billion I0421 01:31:27.621938 140639728219968 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0421 01:31:28.177966 140639728219968 checkpointing.py:776] Waited 0.5560004711151123 seconds for step 0 to finish before starting checkpointing. I0421 01:31:28.180666 140639728219968 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:31:28.182323 140639728219968 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 0 I0421 01:31:28.185128 140639728219968 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints/0. I0421 01:31:29.195653 140639728219968 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 01:31:29.196664 140639728219968 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:31:29.196736 140639728219968 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 I0421 01:31:29.444915 140639728219968 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.249337s I0421 01:31:29.445086 140639728219968 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.883 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.535020112991333 s) (per-host) I0421 01:31:29.445150 140639728219968 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.535090s (batch_requests_ready=0.282158s, total_serialization_initiated=0.252854s, others=0.000078s) I0421 01:31:29.445269 140639728219968 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.539049s (all_items=0.000019s, per_item={'items': '0.00001931'}, temp_paths=0.539029) I0421 01:31:29.446227 140516414969600 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0421 01:31:29.446354 140639728219968 async_checkpointer.py:561] Finished blocking save. Time taken: 1.263962s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints/0. I0421 01:31:29.869461 140639728219968 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 01:31:29.869868 140512631695104 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 01:31:29.870032 140639728219968 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776735088.1806474, 'wait_for_prev_duration_secs': 7.557868957519531e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776735088.1823618, 'checkpointer_blocking_duration_secs': 1.2641680240631104, 'get_old_steps_start_time': 1776735089.4465506, 'get_old_steps_duration_secs': 2.47955322265625e-05, 'checkpoint_manager_blocking_start_time': 1776735088.178744, 'checkpoint_manager_blocking_duration_secs': 1.6912455558776855} I0421 01:31:29.870137 140639728219968 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0421 01:31:29.870191 140639728219968 max_utils.py:750] Memstats: After params initialized: I0421 01:31:29.870247 140639728219968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0)) I0421 01:31:29.870281 140639728219968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0)) I0421 01:31:29.870311 140639728219968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0)) I0421 01:31:29.870336 140639728219968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0)) I0421 01:31:30.134211 140639728219968 metric_logger.py:185] completed step: 0, seconds: 11.001, TFLOP/s/device: 1.235, Tokens/s/device: 186.159, total_weights: 65536, loss: 10.874 I0421 01:31:30.321234 140639728219968 metric_logger.py:185] completed step: 1, seconds: 2.511, TFLOP/s/device: 5.411, Tokens/s/device: 815.621, total_weights: 65536, loss: 10.874 I0421 01:31:30.727269 140639728219968 metric_logger.py:185] completed step: 2, seconds: 0.040, TFLOP/s/device: 340.965, Tokens/s/device: 51394.012, total_weights: 65536, loss: 10.263 I0421 01:31:30.874572 140639728219968 metric_logger.py:185] completed step: 3, seconds: 0.406, TFLOP/s/device: 33.453, Tokens/s/device: 5042.348, total_weights: 65536, loss: 9.734 I0421 01:31:31.170095 140639728219968 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.990, Tokens/s/device: 13413.588, total_weights: 65536, loss: 9.278 I0421 01:31:31.175415 140639728219968 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.309, Tokens/s/device: 13913.800, total_weights: 65536, loss: 8.892 I0421 01:31:49.566962 140639728219968 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.920, Tokens/s/device: 6921.608, total_weights: 65536, loss: 8.592 I0421 01:31:49.714329 140639728219968 metric_logger.py:185] completed step: 7, seconds: 18.245, TFLOP/s/device: 0.745, Tokens/s/device: 112.252, total_weights: 65536, loss: 8.384 I0421 01:31:49.861818 140639728219968 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.457, Tokens/s/device: 13483.975, total_weights: 65536, loss: 8.255 I0421 01:31:50.008938 140639728219968 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0421 01:31:50.009529 140639728219968 checkpointing.py:776] Waited 0.0006124973297119141 seconds for step 9 to finish before starting checkpointing. I0421 01:31:50.011650 140639728219968 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 01:31:50.681198 2617 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 01:31:52.512411 140516423362304 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints/0/items/array_metadatas/process_4 I0421 01:32:24.919062 140516414969600 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 28.203 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 56.00895428657532 s) (per-host) I0421 01:32:24.919191 140516414969600 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 55.472755s. I0421 01:32:32.970677 140516414969600 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 63.524227s. I0421 01:32:32.971019 140512631695104 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 01:32:32.971158 140512631695104 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 01:32:32.971210 140512631695104 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:32:32.972662 140512631695104 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 01:32:32.972853 140639728219968 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. W0421 01:32:32.972984 140639728219968 checkpoint_manager.py:1458] Waiting for previous save to complete took 42.961339 seconds. If this number is high, consider checkpointing less frequently. I0421 01:32:32.974761 140639728219968 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 9 I0421 01:32:32.978130 140639728219968 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints/9. I0421 01:32:33.939047 140639728219968 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:32:33.939144 140639728219968 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 I0421 01:32:33.983287 140639728219968 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.045453s I0421 01:32:33.983451 140639728219968 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.000 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3085052967071533 s) (per-host) I0421 01:32:33.983500 140639728219968 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.308562s (batch_requests_ready=0.261194s, total_serialization_initiated=0.047304s, others=0.000065s) I0421 01:32:33.983587 140639728219968 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.313077s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.313062) I0421 01:32:33.984412 140513713829632 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0421 01:32:33.984587 140639728219968 async_checkpointer.py:561] Finished blocking save. Time taken: 1.009756s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints/9. I0421 01:32:34.410004 140639728219968 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 01:32:34.410363 140512631695104 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 01:32:34.410537 140639728219968 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776735110.011622, 'wait_for_prev_duration_secs': 42.96133875846863, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776735152.9748023, 'checkpointer_blocking_duration_secs': 1.0099077224731445, 'get_old_steps_start_time': 1776735153.9847324, 'get_old_steps_duration_secs': 2.7179718017578125e-05, 'checkpoint_manager_blocking_start_time': 1776735110.0097752, 'checkpoint_manager_blocking_duration_secs': 44.40072321891785} I0421 01:32:34.410642 140639728219968 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0421 01:32:34.410686 140639728219968 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 01:32:39.044104 140516423362304 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_11_optimizer_offload_false/checkpoints/9/items/array_metadatas/process_4 I0421 01:33:16.439636 140513713829632 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 36.937 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.76464557647705 s) (per-host) I0421 01:33:16.439773 140513713829632 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.455238s. I0421 01:33:22.491970 140513713829632 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 48.507421s. I0421 01:33:22.492248 140512631695104 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 01:33:22.492368 140512631695104 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 01:33:22.492431 140512631695104 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:33:22.493878 140512631695104 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 01:33:22.494045 140639728219968 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. I0421 01:33:22.494184 140639728219968 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:33:22.494789 140639728219968 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.287, Tokens/s/device: 13910.492, total_weights: 65536, loss: 8.179 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 01:33:31 UTC 2026 EXIT_CODE=0