XPK Start: Tue Apr 21 02:04:28 UTC 2026
2026-04-21 02:04:32.423870: 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 00:00:1776737072.436337 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776737072.439974 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776737072.451219 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776737072.451237 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776737072.451239 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776737072.451241 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-21 02:04:51.514026: 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 02:04:52.030032 139048710747968 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-21 02:05:01,069:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0421 02:05:01.069647 139048710747968 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-21 02:05:01,071:jax._src.distributed:157: Connecting to JAX distributed service on mt-15-ocdbt-false-sv-1zbqz-slice-job-0-0.mt-15-ocdbt-false-sv-1zbqz:8482
I0421 02:05:01.071994 139048710747968 distributed.py:157] Connecting to JAX distributed service on mt-15-ocdbt-false-sv-1zbqz-slice-job-0-0.mt-15-ocdbt-false-sv-1zbqz:8482
I0421 02:05:02.338691 139048710747968 max_utils.py:284] Jax distributed system initialized!
I0421 02:05:08.353029 139048710747968 max_utils.py:800] System Information: Jax Version: 0.8.1
I0421 02:05:08.353136 139048710747968 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0421 02:05:08.353176 139048710747968 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 02:05:08.353213 139048710747968 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0421 02:05:08.971621 139048710747968 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 02:05:08.971917 139048710747968 checkpointing.py:677] Setting up checkpoint logger...
I0421 02:05:08.971979 139048710747968 checkpointing.py:233] Creating checkpoint manager with ocdbt=False and zarr3=True
I0421 02:05:08.972024 139048710747968 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0421 02:05:08.972386 139048710747968 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=False, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7e7652b750a0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 02:05:11.792641 139048710747968 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0421 02:05:11.792980 139048710747968 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 0x7e62a4343830>}, handler_registry=None
I0421 02:05:11.793278 139048710747968 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e62a4343830>` 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 02:05:11.793331 139048710747968 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e62a43472f0>` 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 02:05:11.793369 139048710747968 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 0x7e62a4343830>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e62a4343830>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e62a43472f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e62a43472f0>}).
I0421 02:05:11.795993 139048710747968 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0421 02:05:11.796077 139048710747968 async_checkpointer.py:177] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e763e7fb2e0> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0421 02:05:13.397153 139048710747968 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_15_ocdbt_false/checkpoints
I0421 02:05:14.262711 139048710747968 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_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e7507bfc470>
I0421 02:05:14.262894 139048710747968 checkpointing.py:301] Checkpoint manager created!
I0421 02:05:15.147032 139048710747968 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 02:05:15.147137 139048710747968 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 02:05:15.519801 139048710747968 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 02:05:15.519898 139048710747968 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 02:05:15.536171 139048710747968 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 02:05:15.536229 139048710747968 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 02:05:15.560208 139048710747968 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 02:05:15.560280 139048710747968 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 02:05:15.576932 139048710747968 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 02:05:15.576995 139048710747968 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 02:05:15.593512 139048710747968 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 02:05:15.593576 139048710747968 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 02:05:15.618126 139048710747968 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 02:05:15.618195 139048710747968 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 02:05:15.638035 139048710747968 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 02:05:15.638101 139048710747968 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0421 02:05:15.832490 139048710747968 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 02:05:15.832601 139048710747968 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0421 02:05:17.256992 139048710747968 maxtext_utils.py:1501] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: PartitionSpec('norm',)
Physical: (None,)
I0421 02:05:17.257121 139048710747968 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 02:05:17.257177 139048710747968 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 02:05:17.257236 139048710747968 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 02:05:17.257290 139048710747968 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 02:05:17.257330 139048710747968 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 02:05:17.257383 139048710747968 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 02:05:17.257465 139048710747968 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 02:05:17.257513 139048710747968 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 02:05:17.257553 139048710747968 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 02:05:17.257602 139048710747968 maxtext_utils.py:1501] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: PartitionSpec('embed', 'vocab')
Physical: ('fsdp', None)
I0421 02:05:17.257650 139048710747968 maxtext_utils.py:1501] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: PartitionSpec('vocab', 'embed')
Physical: (None, 'fsdp')
I0421 02:05:17.762639 139048710747968 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 02:05:17.762738 139048710747968 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 02:05:17.778377 139048710747968 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 02:05:17.778446 139048710747968 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 02:05:28.548164 139048710747968 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 02:05:28.549043 139048710747968 metric_logger.py:289] number parameters: 1.104 billion
I0421 02:05:39.539216 139048710747968 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0421 02:05:39.726089 139048710747968 checkpointing.py:776] Waited 0.1868586540222168 seconds for step 0 to finish before starting checkpointing.
I0421 02:05:39.728491 139048710747968 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 02:05:39.730134 139048710747968 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 0
I0421 02:05:39.732883 139048710747968 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_15_ocdbt_false/checkpoints/0.
I0421 02:05:41.176511 139048710747968 signaling_client.py:364] Using JaxDistributedSignalingClient
I0421 02:05:41.177627 139048710747968 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0421 02:05:41.177688 139048710747968 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 02:05:41.422541 139048710747968 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.246110s
I0421 02:05:41.422713 139048710747968 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 1.634 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.9442665576934814 s) (per-host)
I0421 02:05:41.422765 139048710747968 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.944328s (batch_requests_ready=0.694525s, total_serialization_initiated=0.249734s, others=0.000069s)
I0421 02:05:41.422854 139048710747968 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.948404s (all_items=0.000018s, per_item={'items': '0.00001836'}, temp_paths=0.948385)
I0421 02:05:41.423823 138929038685952 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started.
I0421 02:05:41.423999 139048710747968 async_checkpointer.py:561] Finished blocking save. Time taken: 1.693793s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_false/checkpoints/0.
I0421 02:05:41.468306 139048710747968 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 02:05:41.468647 138924156491520 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save.
I0421 02:05:41.468810 139048710747968 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_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776737139.7284737, 'wait_for_prev_duration_secs': 6.103515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776737139.7301714, 'checkpointer_blocking_duration_secs': 1.6939330101013184, 'get_old_steps_start_time': 1776737141.4241252, 'get_old_steps_duration_secs': 2.4557113647460938e-05, 'checkpoint_manager_blocking_start_time': 1776737139.7266493, 'checkpoint_manager_blocking_duration_secs': 1.742119312286377}
I0421 02:05:41.468920 139048710747968 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0421 02:05:41.468974 139048710747968 max_utils.py:750]
Memstats: After params initialized:
I0421 02:05:41.469029 139048710747968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0))
I0421 02:05:41.469064 139048710747968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0))
I0421 02:05:41.469092 139048710747968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0))
I0421 02:05:41.469117 139048710747968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0))
I0421 02:05:41.739508 139048710747968 metric_logger.py:185] completed step: 0, seconds: 10.990, TFLOP/s/device: 1.236, Tokens/s/device: 186.350, total_weights: 65536, loss: 10.874
I0421 02:05:42.004063 139048710747968 metric_logger.py:185] completed step: 1, seconds: 2.199, TFLOP/s/device: 6.179, Tokens/s/device: 931.329, total_weights: 65536, loss: 10.874
I0421 02:05:42.392045 139048710747968 metric_logger.py:185] completed step: 2, seconds: 0.117, TFLOP/s/device: 115.716, Tokens/s/device: 17441.959, total_weights: 65536, loss: 10.560
I0421 02:05:42.539522 139048710747968 metric_logger.py:185] completed step: 3, seconds: 0.388, TFLOP/s/device: 35.001, Tokens/s/device: 5275.699, total_weights: 65536, loss: 9.980
I0421 02:05:42.544036 139048710747968 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0421 02:05:42.834191 139048710747968 checkpointing.py:776] Waited 0.29012465476989746 seconds for step 5 to finish before starting checkpointing.
I0421 02:05:42.837051 139048710747968 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 02:05:46.177861 2575 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0421 02:05:48.933891 138929525200640 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_15_ocdbt_false/checkpoints/0/items/array_metadatas/process_1
I0421 02:05:53.435247 138929038685952 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 121.913 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 12.956774950027466 s) (per-host)
I0421 02:05:53.435350 138929038685952 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 12.011415s.
I0421 02:06:01.037184 138929038685952 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 19.613204s.
I0421 02:06:01.037490 138924156491520 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 02:06:01.037615 138924156491520 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save.
I0421 02:06:01.037667 138924156491520 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 02:06:01.039325 138924156491520 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 02:06:01.039496 139048710747968 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 02:06:01.039626 139048710747968 checkpoint_manager.py:1458] Waiting for previous save to complete took 18.202577 seconds. If this number is high, consider checkpointing less frequently.
I0421 02:06:01.041540 139048710747968 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 5
I0421 02:06:01.045610 139048710747968 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_15_ocdbt_false/checkpoints/5.
I0421 02:06:02.428689 139048710747968 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0421 02:06:02.428791 139048710747968 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 02:06:02.471958 139048710747968 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044704s
I0421 02:06:02.472133 139048710747968 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.129 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.7244434356689453 s) (per-host)
I0421 02:06:02.472187 139048710747968 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.724507s (batch_requests_ready=0.677865s, total_serialization_initiated=0.046570s, others=0.000072s)
I0421 02:06:02.472280 139048710747968 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.729401s (all_items=0.000016s, per_item={'items': '0.00001597'}, temp_paths=0.729385)
I0421 02:06:02.473185 138919878309632 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started.
I0421 02:06:02.473345 139048710747968 async_checkpointer.py:561] Finished blocking save. Time taken: 1.431733s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_false/checkpoints/5.
I0421 02:06:02.475294 139048710747968 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 02:06:02.475552 138924156491520 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save.
I0421 02:06:02.475706 139048710747968 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_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776737142.8370233, 'wait_for_prev_duration_secs': 18.202577352523804, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776737161.041578, 'checkpointer_blocking_duration_secs': 1.4318897724151611, 'get_old_steps_start_time': 1776737162.4734874, 'get_old_steps_duration_secs': 2.5510787963867188e-05, 'checkpoint_manager_blocking_start_time': 1776737142.8348656, 'checkpoint_manager_blocking_duration_secs': 19.640804290771484}
I0421 02:06:02.475816 139048710747968 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0421 02:06:02.476361 139048710747968 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.988, Tokens/s/device: 13413.236, total_weights: 65536, loss: 9.460
I0421 02:06:02.482158 139048710747968 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.172, Tokens/s/device: 13893.223, total_weights: 65536, loss: 8.959
I0421 02:06:23.222640 139048710747968 metric_logger.py:185] completed step: 6, seconds: 19.937, TFLOP/s/device: 0.682, Tokens/s/device: 102.724, total_weights: 65536, loss: 8.469
I0421 02:06:23.370087 139048710747968 metric_logger.py:185] completed step: 7, seconds: 20.594, TFLOP/s/device: 0.660, Tokens/s/device: 99.445, total_weights: 65536, loss: 8.003
I0421 02:06:23.517455 139048710747968 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.392, Tokens/s/device: 13474.127, total_weights: 65536, loss: 7.572
I0421 02:06:23.664628 139048710747968 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0421 02:06:23.665265 139048710747968 checkpointing.py:776] Waited 0.0006556510925292969 seconds for step 9 to finish before starting checkpointing.
I0421 02:06:23.667324 139048710747968 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 02:06:27.789781 138929525200640 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_15_ocdbt_false/checkpoints/5/items/array_metadatas/process_1
I0421 02:06:33.167992 138919878309632 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 50.273 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 31.420263528823853 s) (per-host)
I0421 02:06:33.168112 138919878309632 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 30.694816s.
I0421 02:06:39.884043 138919878309632 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 37.410732s.
I0421 02:06:39.884345 138924156491520 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 02:06:39.884473 138924156491520 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save.
I0421 02:06:39.884521 138924156491520 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0421 02:06:39.885986 138924156491520 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0421 02:06:39.886166 139048710747968 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 02:06:39.886292 139048710747968 checkpoint_manager.py:1458] Waiting for previous save to complete took 16.218981 seconds. If this number is high, consider checkpointing less frequently.
I0421 02:06:39.887763 139048710747968 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 9
I0421 02:06:39.891278 139048710747968 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_15_ocdbt_false/checkpoints/9.
I0421 02:06:40.846013 139048710747968 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0421 02:06:40.846112 139048710747968 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 02:06:40.888926 139048710747968 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043923s
I0421 02:06:40.889096 139048710747968 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.169 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2984433174133301 s) (per-host)
I0421 02:06:40.889146 139048710747968 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.298503s (batch_requests_ready=0.252505s, total_serialization_initiated=0.045933s, others=0.000065s)
I0421 02:06:40.889230 139048710747968 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.302653s (all_items=0.000011s, per_item={'items': '0.00001097'}, temp_paths=0.302642)
I0421 02:06:40.890117 138929525200640 async_checkpointer.py:79] [process=1][thread=async_save] Background save thread started.
I0421 02:06:40.890280 139048710747968 async_checkpointer.py:561] Finished blocking save. Time taken: 1.002445s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_15_ocdbt_false/checkpoints/9.
I0421 02:06:41.758175 139048710747968 checkpoint_manager.py:1566] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 02:06:41.758546 138924156491520 async_checkpointer.py:265] [process=1][thread=save_finalize] Waiting for background save thread=async_save.
I0421 02:06:41.758714 139048710747968 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_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776737183.6672952, 'wait_for_prev_duration_secs': 16.21898078918457, 'time_between_consecutive_saves_sec': 22.627933025360107, 'checkpointer_blocking_start_time': 1776737199.8878028, 'checkpointer_blocking_duration_secs': 1.00258469581604, 'get_old_steps_start_time': 1776737200.890419, 'get_old_steps_duration_secs': 2.0503997802734375e-05, 'checkpoint_manager_blocking_start_time': 1776737183.665513, 'checkpoint_manager_blocking_duration_secs': 18.093167066574097}
I0421 02:06:41.758823 139048710747968 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0421 02:06:41.758866 139048710747968 checkpoint_manager.py:2024] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 02:06:45.575954 138918787782400 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_15_ocdbt_false/checkpoints/9/items/array_metadatas/process_1
I0421 02:06:51.281549 138929525200640 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 147.752 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.690846681594849 s) (per-host)
I0421 02:06:51.281668 138929525200640 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.391436s.
I0421 02:06:57.935292 138929525200640 async_checkpointer.py:144] [process=1][thread=async_save] Background save thread done. Time taken: 17.045043s.
I0421 02:06:57.935606 138924156491520 async_checkpointer.py:273] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 02:06:57.935733 138924156491520 async_checkpointer.py:283] [process=1][thread=save_finalize] No errors found in background save thread=async_save.
I0421 02:06:57.935775 138924156491520 checkpoint_manager.py:2133] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0421 02:06:57.937348 138924156491520 checkpoint_manager.py:2142] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0421 02:06:57.937527 139048710747968 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 02:06:57.937686 139048710747968 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 02:06:57.938327 139048710747968 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.152, Tokens/s/device: 13890.208, 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 02:07:09 UTC 2026
EXIT_CODE=0