XPK Start: Tue Apr 21 01:42:20 UTC 2026 2026-04-21 01:42:24.865026: 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 00:00:1776735744.877727 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776735744.881455 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776735744.893016 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776735744.893036 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776735744.893038 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776735744.893040 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-21 01:42:44.083719: 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 01:42:44.602407 133277396772672 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-21 01:42:53,642:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0421 01:42:53.642054 133277396772672 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-21 01:42:53,644:jax._src.distributed:157: Connecting to JAX distributed service on mt-14-async-ckpt-false--zw7b5-slice-job-0-0.mt-14-async-ckpt-false--zw7b5:8482 I0421 01:42:53.644428 133277396772672 distributed.py:157] Connecting to JAX distributed service on mt-14-async-ckpt-false--zw7b5-slice-job-0-0.mt-14-async-ckpt-false--zw7b5:8482 I0421 01:42:55.079003 133277396772672 max_utils.py:284] Jax distributed system initialized! I0421 01:43:01.850480 133277396772672 max_utils.py:800] System Information: Jax Version: 0.8.1 I0421 01:43:01.850586 133277396772672 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0421 01:43:01.850626 133277396772672 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 01:43:01.850660 133277396772672 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 01:43:02.479205 133277396772672 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 01:43:02.479508 133277396772672 checkpointing.py:677] Setting up checkpoint logger... I0421 01:43:02.479566 133277396772672 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 01:43:02.479609 133277396772672 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0421 01:43:02.479962 133277396772672 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 0x793684170f80>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 01:43:05.370064 133277396772672 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0421 01:43:05.370417 133277396772672 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 0x79243a14e9f0>}, handler_registry=None I0421 01:43:05.370652 133277396772672 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79243a14e9f0>` 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 01:43:05.370702 133277396772672 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79243a154650>` 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 01:43:05.370741 133277396772672 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 0x79243a14e9f0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79243a14e9f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79243a154650>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79243a154650>}). I0421 01:43:05.373463 133277396772672 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0421 01:43:07.590574 133277396772672 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_14_async_ckpt_false/checkpoints I0421 01:43:07.706018 133277396772672 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=False, 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_14_async_ckpt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x79243a667d70> I0421 01:43:07.706192 133277396772672 checkpointing.py:301] Checkpoint manager created! I0421 01:43:08.617448 133277396772672 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 01:43:08.617551 133277396772672 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:43:08.989677 133277396772672 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 01:43:08.989768 133277396772672 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:43:09.005992 133277396772672 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 01:43:09.006055 133277396772672 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 01:43:09.029492 133277396772672 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:43:09.029564 133277396772672 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:43:09.045469 133277396772672 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:43:09.045529 133277396772672 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:43:09.067195 133277396772672 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 01:43:09.067296 133277396772672 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:43:09.091744 133277396772672 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 01:43:09.091816 133277396772672 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 01:43:09.111857 133277396772672 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 01:43:09.111924 133277396772672 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 01:43:09.301909 133277396772672 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0421 01:43:09.302021 133277396772672 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 01:43:10.740620 133277396772672 maxtext_utils.py:1501] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0421 01:43:10.740788 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 01:43:10.740864 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 01:43:10.740964 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0421 01:43:10.741049 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0421 01:43:10.741118 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0421 01:43:10.741208 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/self_attention/key/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0421 01:43:10.741291 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/self_attention/out/kernel Shape: float32[16,16,128,2048] Logical: PartitionSpec('heads', 'layers', 'kv', 'embed') Physical: (None, None, None, 'fsdp') I0421 01:43:10.741356 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/self_attention/query/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'q_heads', 'kv') Physical: ('fsdp', None, None, None) I0421 01:43:10.741434 133277396772672 maxtext_utils.py:1501] params/params/decoder/layers/self_attention/value/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0421 01:43:10.741496 133277396772672 maxtext_utils.py:1501] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0421 01:43:10.741546 133277396772672 maxtext_utils.py:1501] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0421 01:43:11.249463 133277396772672 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 01:43:11.249560 133277396772672 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0421 01:43:11.264567 133277396772672 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 01:43:11.264627 133277396772672 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0421 01:43:21.666035 133277396772672 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0421 01:43:21.666957 133277396772672 metric_logger.py:289] number parameters: 1.104 billion I0421 01:43:32.700840 133277396772672 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0421 01:43:33.025503 133277396772672 checkpointing.py:776] Waited 0.3246445655822754 seconds for step 0 to finish before starting checkpointing. I0421 01:43:33.028079 133277396772672 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:43:33.029840 133277396772672 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 0 I0421 01:43:33.031278 133277396772672 checkpointer.py:241] [process=1] Started saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_14_async_ckpt_false/checkpoints/0. I0421 01:43:37.239872 133277396772672 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 01:43:37.242498 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=1] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:43:38.926128 133277396772672 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:43:38.926231 133277396772672 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 01:43:39.181013 133277396772672 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.255938s I0421 01:43:39.181198 133277396772672 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.911 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5298542976379395 s) (per-host) I0421 01:43:39.181258 133277396772672 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.529924s (batch_requests_ready=0.270333s, total_serialization_initiated=0.259514s, others=0.000077s) I0421 01:43:39.181359 133277396772672 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 1.941581s (all_items=0.000034s, per_item={'items': '0.00003433'}, temp_paths=1.941547) I0421 01:43:39.181418 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=1] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:43:39.181461 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=1] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:43:39.192282 2532 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 01:43:41.982983 133157877708544 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_14_async_ckpt_false/checkpoints/0/items/array_metadatas/process_1 I0421 01:44:12.652012 133277396772672 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 46.458 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 34.000633001327515 s) (per-host) I0421 01:44:22.013616 133277396772672 checkpointer.py:290] Finished synchronous save in 48.98 seconds to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_14_async_ckpt_false/checkpoints/0 I0421 01:44:22.015853 133277396772672 checkpoint_manager.py:2133] [process=1][thread=MainThread][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:44:22.017764 133277396772672 checkpoint_manager.py:2142] [process=1][thread=MainThread][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 01:44:22.017813 133277396772672 checkpoint_manager.py:1587] [process=1][thread=MainThread][step=0] Finished synchronous save. I0421 01:44:22.017868 133277396772672 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_14_async_ckpt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': True, 'wait_for_prev_start_time': 1776735813.0280595, 'wait_for_prev_duration_secs': 6.341934204101562e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776735813.029881, 'checkpointer_blocking_duration_secs': 48.98385548591614, 'get_old_steps_start_time': 1776735862.013757, 'get_old_steps_duration_secs': 2.6226043701171875e-05, 'checkpoint_manager_blocking_start_time': 1776735813.0261364, 'checkpoint_manager_blocking_duration_secs': 48.991700887680054} I0421 01:44:22.017955 133277396772672 checkpointing.py:410] Saved a checkpoint at step 0. I0421 01:44:22.017998 133277396772672 max_utils.py:750] Memstats: After params initialized: I0421 01:44:22.018043 133277396772672 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0421 01:44:22.018073 133277396772672 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0421 01:44:22.018099 133277396772672 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0421 01:44:22.018122 133277396772672 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0421 01:44:22.299838 133277396772672 metric_logger.py:185] completed step: 0, seconds: 11.034, TFLOP/s/device: 1.231, Tokens/s/device: 185.612, total_weights: 65536, loss: 10.874 I0421 01:44:22.442628 133277396772672 metric_logger.py:185] completed step: 1, seconds: 49.580, TFLOP/s/device: 0.274, Tokens/s/device: 41.307, total_weights: 65536, loss: 10.874 I0421 01:44:22.856592 133277396772672 metric_logger.py:185] completed step: 2, seconds: 0.023, TFLOP/s/device: 594.467, Tokens/s/device: 89604.480, total_weights: 65536, loss: 10.560 I0421 01:44:23.004301 133277396772672 metric_logger.py:185] completed step: 3, seconds: 0.405, TFLOP/s/device: 33.580, Tokens/s/device: 5061.502, total_weights: 65536, loss: 9.980 I0421 01:44:23.009030 133277396772672 checkpointing.py:772] Waiting for step 5 to finish before checkpoint... I0421 01:44:23.298954 133277396772672 checkpointing.py:776] Waited 0.2898852825164795 seconds for step 5 to finish before starting checkpointing. I0421 01:44:23.301712 133277396772672 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:44:23.303358 133277396772672 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 5 I0421 01:44:23.305212 133277396772672 checkpointer.py:241] [process=1] Started saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_14_async_ckpt_false/checkpoints/5. I0421 01:44:26.562627 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=2] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:44:30.366517 133277396772672 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:44:30.366620 133277396772672 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 01:44:30.408514 133277396772672 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043056s I0421 01:44:30.408697 133277396772672 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 1.998 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.7719123363494873 s) (per-host) I0421 01:44:30.408760 133277396772672 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.771982s (batch_requests_ready=0.726916s, total_serialization_initiated=0.044987s, others=0.000079s) I0421 01:44:30.408893 133277396772672 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 3.847409s (all_items=0.000027s, per_item={'items': '0.00002742'}, temp_paths=3.847382) I0421 01:44:30.408961 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=2] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:44:30.409012 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=2] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:44:32.672739 133157877708544 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_14_async_ckpt_false/checkpoints/5/items/array_metadatas/process_1 I0421 01:45:07.858314 133277396772672 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 41.327 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 38.22149157524109 s) (per-host) I0421 01:45:17.618687 133277396772672 checkpointer.py:290] Finished synchronous save in 54.32 seconds to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_14_async_ckpt_false/checkpoints/5 I0421 01:45:17.620602 133277396772672 checkpoint_manager.py:2133] [process=1][thread=MainThread][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:45:17.622301 133277396772672 checkpoint_manager.py:2142] [process=1][thread=MainThread][step=5] CheckpointManager Save Finalize is done on all hosts. I0421 01:45:17.622424 133277396772672 checkpoint_manager.py:1587] [process=1][thread=MainThread][step=5] Finished synchronous save. I0421 01:45:17.622493 133277396772672 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_14_async_ckpt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': True, 'wait_for_prev_start_time': 1776735863.3016908, 'wait_for_prev_duration_secs': 6.508827209472656e-05, 'time_between_consecutive_saves_sec': 1.283888816833496, 'checkpointer_blocking_start_time': 1776735863.303409, 'checkpointer_blocking_duration_secs': 54.315391540527344, 'get_old_steps_start_time': 1776735917.6188195, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776735863.2996666, 'checkpoint_manager_blocking_duration_secs': 54.32279086112976} I0421 01:45:17.622588 133277396772672 checkpointing.py:410] Saved a checkpoint at step 5. I0421 01:45:17.623194 133277396772672 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.875, Tokens/s/device: 13396.215, total_weights: 65536, loss: 9.460 I0421 01:45:17.646185 133277396772672 metric_logger.py:185] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.039, Tokens/s/device: 13873.177, total_weights: 65536, loss: 8.959 I0421 01:45:37.548118 133277396772672 metric_logger.py:185] completed step: 6, seconds: 54.619, TFLOP/s/device: 0.249, Tokens/s/device: 37.496, total_weights: 65536, loss: 8.469 I0421 01:45:37.695732 133277396772672 metric_logger.py:185] completed step: 7, seconds: 19.773, TFLOP/s/device: 0.687, Tokens/s/device: 103.576, total_weights: 65536, loss: 8.003 I0421 01:45:37.843257 133277396772672 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.218, Tokens/s/device: 13447.938, total_weights: 65536, loss: 7.572 I0421 01:45:37.990510 133277396772672 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0421 01:45:37.991171 133277396772672 checkpointing.py:776] Waited 0.0006823539733886719 seconds for step 9 to finish before starting checkpointing. I0421 01:45:37.993233 133277396772672 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:45:37.995104 133277396772672 checkpoint_manager.py:1518] [process=1] Saving checkpoint at step 9 I0421 01:45:37.996462 133277396772672 checkpointer.py:241] [process=1] Started saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_14_async_ckpt_false/checkpoints/9. I0421 01:45:40.870243 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=3] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:45:42.986926 133277396772672 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0421 01:45:42.987034 133277396772672 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 01:45:43.031455 133277396772672 base_pytree_checkpoint_handler.py:153] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.045573s I0421 01:45:43.031633 133277396772672 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.881 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.31604576110839844 s) (per-host) I0421 01:45:43.031687 133277396772672 base_pytree_checkpoint_handler.py:737] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.316109s (batch_requests_ready=0.268248s, total_serialization_initiated=0.047792s, others=0.000069s) I0421 01:45:43.031785 133277396772672 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 2.162885s (all_items=0.000023s, per_item={'items': '0.00002337'}, temp_paths=2.162862) I0421 01:45:43.031824 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=3] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:45:43.031865 133277396772672 future.py:363] [process=1][thread=MainThread][operation_id=3] _SignalingThread.join() waiting for signals ([]) blocking the main thread will slow down blocking save times. This is likely due to main thread calling result() on a CommitFuture. I0421 01:45:46.241380 133154111219456 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_14_async_ckpt_false/checkpoints/9/items/array_metadatas/process_1 I0421 01:46:22.082546 133277396772672 base_pytree_checkpoint_handler.py:129] [process=1] /jax/checkpoint/write/gbytes_per_sec: 40.125 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 39.36692023277283 s) (per-host) I0421 01:46:32.414276 133277396772672 checkpointer.py:290] Finished synchronous save in 54.42 seconds to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_14_async_ckpt_false/checkpoints/9 I0421 01:46:32.416388 133277396772672 checkpoint_manager.py:2133] [process=1][thread=MainThread][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 01:46:32.418011 133277396772672 checkpoint_manager.py:2142] [process=1][thread=MainThread][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 01:46:32.418060 133277396772672 checkpoint_manager.py:1587] [process=1][thread=MainThread][step=9] Finished synchronous save. I0421 01:46:32.418115 133277396772672 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_14_async_ckpt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': True, 'wait_for_prev_start_time': 1776735937.9932163, 'wait_for_prev_duration_secs': 5.9604644775390625e-05, 'time_between_consecutive_saves_sec': 20.37080454826355, 'checkpointer_blocking_start_time': 1776735937.9951458, 'checkpointer_blocking_duration_secs': 54.41924500465393, 'get_old_steps_start_time': 1776735992.414427, 'get_old_steps_duration_secs': 2.0265579223632812e-05, 'checkpoint_manager_blocking_start_time': 1776735937.9913895, 'checkpoint_manager_blocking_duration_secs': 54.42669653892517} I0421 01:46:32.418198 133277396772672 checkpointing.py:410] Saved a checkpoint at step 9. I0421 01:46:32.418230 133277396772672 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:46:32.418259 133277396772672 checkpoint_manager.py:2013] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 01:46:32.418674 133277396772672 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.172, Tokens/s/device: 13893.129, 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 01:46:41 UTC 2026 EXIT_CODE=0