XPK Start: Tue Apr 21 02:12:04 UTC 2026 2026-04-21 02:12:08.298798: 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 00:00:1776737528.311445 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776737528.315257 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776737528.327202 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776737528.327237 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776737528.327240 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776737528.327242 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-21 02:12:27.448769: 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 02:12:27.972744 138857925683008 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-21 02:12:37,014:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0421 02:12:37.014064 138857925683008 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-21 02:12:37,016:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-true-sv-kqi7a-slice-job-0-0.mt-16-zarr3-true-sv-kqi7a:8482 I0421 02:12:37.016449 138857925683008 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-true-sv-kqi7a-slice-job-0-0.mt-16-zarr3-true-sv-kqi7a:8482 I0421 02:12:38.237684 138857925683008 max_utils.py:284] Jax distributed system initialized! I0421 02:12:45.090187 138857925683008 max_utils.py:800] System Information: Jax Version: 0.8.1 I0421 02:12:45.090294 138857925683008 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0421 02:12:45.090335 138857925683008 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 02:12:45.090372 138857925683008 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 02:12:45.707176 138857925683008 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 02:12:45.707476 138857925683008 checkpointing.py:677] Setting up checkpoint logger... I0421 02:12:45.707531 138857925683008 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 02:12:45.707576 138857925683008 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0421 02:12:45.707919 138857925683008 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 0x7e49e9f751c0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 02:12:49.457887 138857925683008 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0421 02:12:49.458542 138857925683008 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 0x7e369ba461e0>}, handler_registry=None I0421 02:12:49.458780 138857925683008 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e369ba461e0>` 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 02:12:49.458832 138857925683008 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e369ac07440>` 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 02:12:49.458872 138857925683008 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 0x7e369ba461e0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e369ba461e0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e369ac07440>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e369ac07440>}). I0421 02:12:49.459387 138857925683008 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0421 02:12:49.459479 138857925683008 async_checkpointer.py:177] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e3699680040> timeout: 600 secs and primary_host=0 for async checkpoint writes I0421 02:12:51.649004 138857925683008 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_16_zarr3_true/checkpoints I0421 02:12:52.541988 138857925683008 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=5), 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_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e369ba4fd70> I0421 02:12:52.542168 138857925683008 checkpointing.py:301] Checkpoint manager created! I0421 02:12:53.445910 138857925683008 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 02:12:53.446011 138857925683008 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 02:12:53.819252 138857925683008 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 02:12:53.819343 138857925683008 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 02:12:53.835340 138857925683008 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 02:12:53.835415 138857925683008 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 02:12:53.859084 138857925683008 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 02:12:53.859166 138857925683008 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 02:12:53.875096 138857925683008 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 02:12:53.875157 138857925683008 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 02:12:53.891196 138857925683008 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 02:12:53.891258 138857925683008 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 02:12:53.916119 138857925683008 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 02:12:53.916189 138857925683008 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 02:12:53.935993 138857925683008 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 02:12:53.936059 138857925683008 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 02:12:54.126351 138857925683008 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0421 02:12:54.126465 138857925683008 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 02:12:55.549311 138857925683008 maxtext_utils.py:1501] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0421 02:12:55.549468 138857925683008 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 02:12:55.549541 138857925683008 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 02:12:55.549616 138857925683008 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 02:12:55.549688 138857925683008 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 02:12:55.549740 138857925683008 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 02:12:55.549808 138857925683008 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 02:12:55.549883 138857925683008 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 02:12:55.549928 138857925683008 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 02:12:55.549965 138857925683008 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 02:12:55.550012 138857925683008 maxtext_utils.py:1501] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0421 02:12:55.550059 138857925683008 maxtext_utils.py:1501] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0421 02:12:56.048973 138857925683008 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 02:12:56.049069 138857925683008 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0421 02:12:56.064085 138857925683008 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 02:12:56.064157 138857925683008 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0421 02:13:06.771480 138857925683008 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 02:13:06.772313 138857925683008 metric_logger.py:289] number parameters: 1.104 billion I0421 02:13:17.850844 138857925683008 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0421 02:13:18.009126 138857925683008 checkpointing.py:776] Waited 0.15826678276062012 seconds for step 0 to finish before starting checkpointing. I0421 02:13:18.011683 138857925683008 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 02:13:18.013260 138857925683008 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 0 I0421 02:13:18.015994 138857925683008 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_16_zarr3_true/checkpoints/0. I0421 02:13:19.453377 138857925683008 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 02:13:19.454375 138857925683008 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 02:13:19.454447 138857925683008 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 02:13:19.697424 138857925683008 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.244116s I0421 02:13:19.697591 138857925683008 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.923 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5277433395385742 s) (per-host) I0421 02:13:19.697641 138857925683008 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.527803s (batch_requests_ready=0.280038s, total_serialization_initiated=0.247698s, others=0.000067s) I0421 02:13:19.697733 138857925683008 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.531742s (all_items=0.000020s, per_item={'items': '0.00002027'}, temp_paths=0.531722) I0421 02:13:19.698646 138732703295232 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0421 02:13:19.698817 138857925683008 async_checkpointer.py:561] Finished blocking save. Time taken: 1.685489s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_true/checkpoints/0. I0421 02:13:20.125872 138857925683008 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 02:13:20.126246 138731109467904 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0421 02:13:20.126421 138857925683008 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_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776737598.0116644, 'wait_for_prev_duration_secs': 6.532669067382812e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776737598.0132985, 'checkpointer_blocking_duration_secs': 1.6856269836425781, 'get_old_steps_start_time': 1776737599.6989458, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776737598.009679, 'checkpoint_manager_blocking_duration_secs': 2.1166865825653076} I0421 02:13:20.126529 138857925683008 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0421 02:13:20.126580 138857925683008 max_utils.py:750] Memstats: After params initialized: I0421 02:13:20.126636 138857925683008 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0421 02:13:20.126668 138857925683008 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0421 02:13:20.126694 138857925683008 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0421 02:13:20.126718 138857925683008 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0421 02:13:20.388100 138857925683008 metric_logger.py:185] completed step: 0, seconds: 11.078, TFLOP/s/device: 1.226, Tokens/s/device: 184.864, total_weights: 65536, loss: 10.874 I0421 02:13:20.563763 138857925683008 metric_logger.py:185] completed step: 1, seconds: 2.536, TFLOP/s/device: 5.358, Tokens/s/device: 807.553, total_weights: 65536, loss: 10.874 I0421 02:13:20.950820 138857925683008 metric_logger.py:185] completed step: 2, seconds: 0.028, TFLOP/s/device: 477.932, Tokens/s/device: 72039.115, total_weights: 65536, loss: 10.560 I0421 02:13:21.098240 138857925683008 metric_logger.py:185] completed step: 3, seconds: 0.388, TFLOP/s/device: 35.054, Tokens/s/device: 5283.757, total_weights: 65536, loss: 9.980 I0421 02:13:21.102716 138857925683008 checkpointing.py:772] Waiting for step 5 to finish before checkpoint... I0421 02:13:21.393232 138857925683008 checkpointing.py:776] Waited 0.2904798984527588 seconds for step 5 to finish before starting checkpointing. I0421 02:13:21.396072 138857925683008 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 02:13:25.721274 2618 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 02:13:28.508625 138734892742400 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_16_zarr3_true/checkpoints/0/items/array_metadatas/process_1 I0421 02:13:57.681611 138732703295232 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 41.016 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 38.51171040534973 s) (per-host) I0421 02:13:57.681715 138732703295232 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.982956s. I0421 02:14:09.433888 138732703295232 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 49.735113s. I0421 02:14:09.434140 138731109467904 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 02:14:09.434332 138731109467904 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0421 02:14:09.434441 138731109467904 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 02:14:09.436323 138731109467904 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 02:14:09.436555 138857925683008 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 02:14:09.436709 138857925683008 checkpoint_manager.py:1458] Waiting for previous save to complete took 48.040636 seconds. If this number is high, consider checkpointing less frequently. I0421 02:14:09.438732 138857925683008 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 5 I0421 02:14:09.442841 138857925683008 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_16_zarr3_true/checkpoints/5. I0421 02:14:11.270913 138857925683008 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 02:14:11.271010 138857925683008 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 02:14:11.312212 138857925683008 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042592s I0421 02:14:11.312380 138857925683008 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.127 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.7251160144805908 s) (per-host) I0421 02:14:11.312446 138857925683008 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.725191s (batch_requests_ready=0.680681s, total_serialization_initiated=0.044426s, others=0.000083s) I0421 02:14:11.312541 138857925683008 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.730135s (all_items=0.000016s, per_item={'items': '0.00001621'}, temp_paths=0.730119) I0421 02:14:11.313393 138731663124224 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0421 02:14:11.313564 138857925683008 async_checkpointer.py:561] Finished blocking save. Time taken: 1.874753s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_true/checkpoints/5. I0421 02:14:11.326425 138857925683008 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0421 02:14:11.326663 138731109467904 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0421 02:14:11.326796 138857925683008 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776737601.396045, 'wait_for_prev_duration_secs': 48.04063630104065, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776737649.4387765, 'checkpointer_blocking_duration_secs': 1.8748948574066162, 'get_old_steps_start_time': 1776737651.3136883, 'get_old_steps_duration_secs': 2.6941299438476562e-05, 'checkpoint_manager_blocking_start_time': 1776737601.3938806, 'checkpoint_manager_blocking_duration_secs': 49.93287897109985} I0421 02:14:11.326900 138857925683008 checkpointing.py:408] Started an asynchronous checkpoint save for step 5 I0421 02:14:11.327445 138857925683008 metric_logger.py:185] completed step: 4, seconds: 0.152, TFLOP/s/device: 89.194, Tokens/s/device: 13444.319, total_weights: 65536, loss: 9.460 I0421 02:14:11.333688 138857925683008 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.209, Tokens/s/device: 13898.692, total_weights: 65536, loss: 8.959 I0421 02:14:31.808733 138857925683008 metric_logger.py:185] completed step: 6, seconds: 50.230, TFLOP/s/device: 0.270, Tokens/s/device: 40.773, total_weights: 65536, loss: 8.469 I0421 02:14:31.956430 138857925683008 metric_logger.py:185] completed step: 7, seconds: 20.329, TFLOP/s/device: 0.668, Tokens/s/device: 100.742, total_weights: 65536, loss: 8.003 I0421 02:14:32.103763 138857925683008 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.454, Tokens/s/device: 13483.531, total_weights: 65536, loss: 7.572 I0421 02:14:32.250952 138857925683008 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0421 02:14:32.251615 138857925683008 checkpointing.py:776] Waited 0.0006823539733886719 seconds for step 9 to finish before starting checkpointing. I0421 02:14:32.253661 138857925683008 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 02:14:36.172410 138734892742400 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_16_zarr3_true/checkpoints/5/items/array_metadatas/process_1 I0421 02:15:11.369002 138731663124224 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 25.988 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 60.78169918060303 s) (per-host) I0421 02:15:11.369122 138731663124224 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 60.055605s. I0421 02:15:24.667781 138731663124224 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 73.354249s. I0421 02:15:24.668122 138731109467904 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 02:15:24.668248 138731109467904 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0421 02:15:24.668297 138731109467904 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0421 02:15:24.669686 138731109467904 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0421 02:15:24.669875 138857925683008 checkpoint_manager.py:2036] [process=1][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5. W0421 02:15:24.670005 138857925683008 checkpoint_manager.py:1458] Waiting for previous save to complete took 52.416357 seconds. If this number is high, consider checkpointing less frequently. I0421 02:15:24.671360 138857925683008 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 9 I0421 02:15:24.674966 138857925683008 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_16_zarr3_true/checkpoints/9. I0421 02:15:25.430010 138857925683008 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 02:15:25.430103 138857925683008 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 02:15:25.473904 138857925683008 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044757s I0421 02:15:25.474074 138857925683008 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.149 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29961252212524414 s) (per-host) I0421 02:15:25.474124 138857925683008 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.299673s (batch_requests_ready=0.252866s, total_serialization_initiated=0.046741s, others=0.000066s) I0421 02:15:25.474214 138857925683008 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.303653s (all_items=0.000012s, per_item={'items': '0.00001168'}, temp_paths=0.303642) I0421 02:15:25.475089 138732703295232 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started. I0421 02:15:25.475245 138857925683008 async_checkpointer.py:561] Finished blocking save. Time taken: 0.803807s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_16_zarr3_true/checkpoints/9. I0421 02:15:25.924216 138857925683008 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 02:15:25.924590 138731109467904 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0421 02:15:25.924738 138857925683008 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_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776737672.2536328, 'wait_for_prev_duration_secs': 52.416356801986694, 'time_between_consecutive_saves_sec': 22.817245721817017, 'checkpointer_blocking_start_time': 1776737724.6714098, 'checkpointer_blocking_duration_secs': 0.8039400577545166, 'get_old_steps_start_time': 1776737725.4753628, 'get_old_steps_duration_secs': 2.1219253540039062e-05, 'checkpoint_manager_blocking_start_time': 1776737672.2518346, 'checkpoint_manager_blocking_duration_secs': 53.67287063598633} I0421 02:15:25.924904 138857925683008 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0421 02:15:25.924949 138857925683008 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 02:15:31.652524 138734892742400 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_16_zarr3_true/checkpoints/9/items/array_metadatas/process_1 I0421 02:16:06.412280 138732703295232 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 38.305 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.237775802612305 s) (per-host) I0421 02:16:06.412409 138732703295232 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.937195s. I0421 02:16:15.144892 138732703295232 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 49.669676s. I0421 02:16:15.145165 138731109467904 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 02:16:15.145292 138731109467904 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0421 02:16:15.145333 138731109467904 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 02:16:15.146835 138731109467904 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 02:16:15.147018 138857925683008 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 02:16:15.147168 138857925683008 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 02:16:15.147833 138857925683008 metric_logger.py:185] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.034, Tokens/s/device: 13872.425, total_weights: 65536, loss: 7.181 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 02:16:25 UTC 2026 EXIT_CODE=0