XPK Start: Tue Apr 21 01:24:44 UTC 2026 2026-04-21 01:24:48.605916: 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 00:00:1776734688.618916 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776734688.622614 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776734688.633953 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776734688.633971 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776734688.633974 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776734688.633976 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-21 01:25:07.803623: 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 01:25:08.315373 138795075704640 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-21 01:25:17,357:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0421 01:25:17.357925 138795075704640 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-21 01:25:17,360:jax._src.distributed:157: Connecting to JAX distributed service on mt-09-pdb-lt-1-c1dr4-slice-job-0-0.mt-09-pdb-lt-1-c1dr4:8482 I0421 01:25:17.360253 138795075704640 distributed.py:157] Connecting to JAX distributed service on mt-09-pdb-lt-1-c1dr4-slice-job-0-0.mt-09-pdb-lt-1-c1dr4:8482 I0421 01:25:18.320336 138795075704640 max_utils.py:284] Jax distributed system initialized! I0421 01:25:25.080946 138795075704640 max_utils.py:800] System Information: Jax Version: 0.8.1 I0421 01:25:25.081052 138795075704640 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0421 01:25:25.081093 138795075704640 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 01:25:25.081130 138795075704640 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 01:25:25.697260 138795075704640 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 8, 1, 1, 1, 1, 4, 1, 1, 1, 1) I0421 01:25:25.697557 138795075704640 checkpointing.py:677] Setting up checkpoint logger... I0421 01:25:25.697614 138795075704640 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 01:25:25.697659 138795075704640 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0421 01:25:25.698004 138795075704640 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 0x7e3b4fbb3740>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 01:25:29.016196 138795075704640 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0421 01:25:29.016456 138795075704640 checkpoint_manager.py:709] [process=1][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e39f9e661b0>}, handler_registry=None I0421 01:25:29.016865 138795075704640 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e39f9e661b0>` 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 01:25:29.017013 138795075704640 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e2797bc35c0>` 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 01:25:29.017055 138795075704640 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 0x7e39f9e661b0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e39f9e661b0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e2797bc35c0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e2797bc35c0>}). I0421 01:25:29.017587 138795075704640 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0421 01:25:29.017682 138795075704640 async_checkpointer.py:177] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e26b4040040> timeout: 600 secs and primary_host=0 for async checkpoint writes I0421 01:25:30.132915 138795075704640 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_09_pdb_lt_1/checkpoints I0421 01:25:30.590529 138795075704640 checkpoint_manager.py:929] [process=1][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_09_pdb_lt_1/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e2797bbcda0> I0421 01:25:30.590702 138795075704640 checkpointing.py:301] Checkpoint manager created! I0421 01:25:31.489848 138795075704640 nnx_wrappers.py:453] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 01:25:31.489959 138795075704640 nnx_wrappers.py:453] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0421 01:25:31.862391 138795075704640 attentions.py:1084] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 01:25:31.862494 138795075704640 attentions.py:1084] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0421 01:25:31.878864 138795075704640 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 01:25:31.878931 138795075704640 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0421 01:25:31.907438 138795075704640 attentions.py:1150] attentions/query Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:25:31.907544 138795075704640 attentions.py:1150] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0421 01:25:31.924492 138795075704640 attentions.py:1151] attentions/key Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:25:31.924555 138795075704640 attentions.py:1151] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0421 01:25:31.941072 138795075704640 attentions.py:1152] attentions/value Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:25:31.941140 138795075704640 attentions.py:1152] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0421 01:25:31.966799 138795075704640 attentions.py:1193] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 01:25:31.966871 138795075704640 attentions.py:1193] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0421 01:25:31.986941 138795075704640 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 01:25:31.987006 138795075704640 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, 'tensor'). I0421 01:25:32.181922 138795075704640 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0421 01:25:32.182028 138795075704640 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 8 tensor: 4 I0421 01:25:33.611262 138795075704640 maxtext_utils.py:1501] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: ('tensor',) I0421 01:25:33.611393 138795075704640 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, 'tensor') I0421 01:25:33.611467 138795075704640 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, 'tensor') I0421 01:25:33.611528 138795075704640 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: ('tensor', None, 'fsdp') I0421 01:25:33.611582 138795075704640 maxtext_utils.py:1501] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: ('tensor', None) I0421 01:25:33.611622 138795075704640 maxtext_utils.py:1501] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: ('tensor', None) I0421 01:25:33.611675 138795075704640 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, 'tensor', None) I0421 01:25:33.611726 138795075704640 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: ('tensor', None, None, 'fsdp') I0421 01:25:33.611767 138795075704640 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, 'tensor', None) I0421 01:25:33.611804 138795075704640 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, 'tensor', None) I0421 01:25:33.611856 138795075704640 maxtext_utils.py:1501] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', 'tensor') I0421 01:25:33.611904 138795075704640 maxtext_utils.py:1501] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: ('tensor', 'fsdp') I0421 01:25:34.117737 138795075704640 train.py:156] train/xent Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0421 01:25:34.117835 138795075704640 train.py:156] train/xent Physical: float32[8,2048]............................................. ('fsdp', None). I0421 01:25:34.133501 138795075704640 train.py:163] train/z_loss Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0421 01:25:34.133561 138795075704640 train.py:163] train/z_loss Physical: float32[8,2048]............................................. ('fsdp', None). I0421 01:25:43.920309 138795075704640 max_utils.py:791] Total memory size: 0.9 GB, Output size: 0.4 GB, Temp size: 0.5 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0421 01:25:43.921199 138795075704640 metric_logger.py:289] number parameters: 1.104 billion I0421 01:25:45.457610 138795075704640 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0421 01:25:54.259028 138795075704640 checkpointing.py:776] Waited 8.801398038864136 seconds for step 0 to finish before starting checkpointing. I0421 01:25:54.261614 138795075704640 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:25:54.263329 138795075704640 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 0 I0421 01:25:54.266079 138795075704640 async_checkpointer.py:452] [process=1] 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_09_pdb_lt_1/checkpoints/0. I0421 01:25:56.073190 138795075704640 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 01:25:56.074290 138795075704640 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:25:56.074347 138795075704640 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 01:25:56.295672 138795075704640 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.222560s I0421 01:25:56.295842 138795075704640 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 1.710 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.9022216796875 s) (per-host) I0421 01:25:56.295895 138795075704640 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.902287s (batch_requests_ready=0.676064s, total_serialization_initiated=0.226150s, others=0.000073s) I0421 01:25:56.296011 138795075704640 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.906289s (all_items=0.000020s, per_item={'items': '0.00001955'}, temp_paths=0.906269) I0421 01:25:56.296993 138672229816064 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0421 01:25:56.297177 138795075704640 async_checkpointer.py:561] Finished blocking save. Time taken: 2.033767s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_09_pdb_lt_1/checkpoints/0. I0421 01:25:56.328059 138795075704640 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 01:25:56.328390 138669545461504 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0421 01:25:56.328569 138795075704640 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_09_pdb_lt_1/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776734754.2615962, 'wait_for_prev_duration_secs': 6.175041198730469e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776734754.2633712, 'checkpointer_blocking_duration_secs': 2.0339102745056152, 'get_old_steps_start_time': 1776734756.2973008, 'get_old_steps_duration_secs': 2.5272369384765625e-05, 'checkpoint_manager_blocking_start_time': 1776734754.2595732, 'checkpoint_manager_blocking_duration_secs': 2.068955898284912} I0421 01:25:56.328674 138795075704640 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0421 01:25:56.328726 138795075704640 max_utils.py:750] Memstats: After params initialized: I0421 01:25:56.328782 138795075704640 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0421 01:25:56.328813 138795075704640 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0421 01:25:56.328841 138795075704640 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0421 01:25:56.328866 138795075704640 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0421 01:25:56.589340 138795075704640 metric_logger.py:185] completed step: 0, seconds: 1.536, TFLOP/s/device: 2.211, Tokens/s/device: 333.268, total_weights: 16384, loss: 10.862 I0421 01:25:56.674119 138795075704640 metric_logger.py:185] completed step: 1, seconds: 11.131, TFLOP/s/device: 0.305, Tokens/s/device: 46.000, total_weights: 16384, loss: 10.862 I0421 01:25:57.102787 138795075704640 metric_logger.py:185] completed step: 2, seconds: 0.027, TFLOP/s/device: 127.747, Tokens/s/device: 19255.359, total_weights: 16384, loss: 9.763 I0421 01:25:57.161453 138795075704640 metric_logger.py:185] completed step: 3, seconds: 0.429, TFLOP/s/device: 7.920, Tokens/s/device: 1193.815, total_weights: 16384, loss: 8.823 I0421 01:25:57.279020 138795075704640 metric_logger.py:185] completed step: 4, seconds: 0.064, TFLOP/s/device: 53.429, Tokens/s/device: 8053.353, total_weights: 16384, loss: 7.947 I0421 01:25:57.284608 138795075704640 metric_logger.py:185] completed step: 5, seconds: 0.059, TFLOP/s/device: 58.006, Tokens/s/device: 8743.319, total_weights: 16384, loss: 7.212 I0421 01:26:10.765708 138795075704640 metric_logger.py:185] completed step: 6, seconds: 0.118, TFLOP/s/device: 28.759, Tokens/s/device: 4334.942, total_weights: 16384, loss: 6.652 I0421 01:26:10.824429 138795075704640 metric_logger.py:185] completed step: 7, seconds: 13.423, TFLOP/s/device: 0.253, Tokens/s/device: 38.143, total_weights: 16384, loss: 6.269 I0421 01:26:10.882898 138795075704640 metric_logger.py:185] completed step: 8, seconds: 0.063, TFLOP/s/device: 53.799, Tokens/s/device: 8109.221, total_weights: 16384, loss: 6.031 I0421 01:26:10.941192 138795075704640 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0421 01:26:10.941832 138795075704640 checkpointing.py:776] Waited 0.0006511211395263672 seconds for step 9 to finish before starting checkpointing. I0421 01:26:10.943798 138795075704640 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 01:26:12.388076 2396 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 01:26:14.787727 138672238208768 array_metadata_store.py:203] [process=1][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_09_pdb_lt_1/checkpoints/0/items/array_metadatas/process_1 I0421 01:26:44.955770 138672229816064 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 31.871 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 49.56211185455322 s) (per-host) I0421 01:26:44.955897 138672229816064 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 48.658788s. I0421 01:26:55.520773 138672229816064 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 59.223644s. I0421 01:26:55.521076 138669545461504 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 01:26:55.521208 138669545461504 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0421 01:26:55.521258 138669545461504 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:26:55.523086 138669545461504 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 01:26:55.523259 138795075704640 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0421 01:26:55.523387 138795075704640 checkpoint_manager.py:1458] Waiting for previous save to complete took 44.579591 seconds. If this number is high, consider checkpointing less frequently. I0421 01:26:55.525360 138795075704640 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 9 I0421 01:26:55.528682 138795075704640 async_checkpointer.py:452] [process=1] 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_09_pdb_lt_1/checkpoints/9. I0421 01:26:56.503277 138795075704640 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:26:56.503376 138795075704640 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 01:26:56.546857 138795075704640 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044706s I0421 01:26:56.547014 138795075704640 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.061 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.30478358268737793 s) (per-host) I0421 01:26:56.547066 138795075704640 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.304843s (batch_requests_ready=0.258305s, total_serialization_initiated=0.046471s, others=0.000066s) I0421 01:26:56.547158 138795075704640 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.308995s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.308980) I0421 01:26:56.548016 138669058946816 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0421 01:26:56.548177 138795075704640 async_checkpointer.py:561] Finished blocking save. Time taken: 1.022733s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_09_pdb_lt_1/checkpoints/9. I0421 01:26:56.995819 138795075704640 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 01:26:56.996213 138669545461504 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0421 01:26:56.996382 138795075704640 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_09_pdb_lt_1/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776734770.9437714, 'wait_for_prev_duration_secs': 44.579590797424316, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776734815.5254114, 'checkpointer_blocking_duration_secs': 1.0228681564331055, 'get_old_steps_start_time': 1776734816.548297, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776734770.9420605, 'checkpoint_manager_blocking_duration_secs': 46.054285526275635} I0421 01:26:56.996504 138795075704640 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0421 01:26:56.996550 138795075704640 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 01:27:03.916422 138672238208768 array_metadata_store.py:203] [process=1][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_09_pdb_lt_1/checkpoints/9/items/array_metadatas/process_1 I0421 01:27:40.178784 138669058946816 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 35.952 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.936511516571045 s) (per-host) I0421 01:27:40.178911 138669058946816 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.630780s. I0421 01:27:47.696953 138669058946816 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 51.148806s. I0421 01:27:47.697203 138669545461504 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 01:27:47.697261 138669545461504 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0421 01:27:47.697313 138669545461504 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:27:47.698914 138669545461504 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 01:27:47.699073 138795075704640 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0421 01:27:47.699218 138795075704640 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:27:47.699845 138795075704640 metric_logger.py:185] completed step: 9, seconds: 0.059, TFLOP/s/device: 58.053, Tokens/s/device: 8750.342, total_weights: 16384, loss: 5.892 Per train step: Total TFLOPs: 3.40 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 01:28:00 UTC 2026 EXIT_CODE=0