XPK Start: Sun Apr 19 10:14:50 UTC 2026 2026-04-19 10:14:54.600487: 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 00:00:1776593694.613974 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776593694.617788 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776593694.629329 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776593694.629347 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776593694.629350 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776593694.629352 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-19 10:15:13.753128: 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) I0419 10:15:14.260787 138212160636736 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-19 10:15:23,299:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0419 10:15:23.299080 138212160636736 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-19 10:15:23,301:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-true-sv-65oc3-slice-job-0-0.mt-16-zarr3-true-sv-65oc3:8482 I0419 10:15:23.301260 138212160636736 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-true-sv-65oc3-slice-job-0-0.mt-16-zarr3-true-sv-65oc3:8482 I0419 10:15:24.561661 138212160636736 max_utils.py:284] Jax distributed system initialized! I0419 10:15:31.564163 138212160636736 max_utils.py:800] System Information: Jax Version: 0.8.1 I0419 10:15:31.564270 138212160636736 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0419 10:15:31.564310 138212160636736 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 I0419 10:15:31.564344 138212160636736 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0419 10:15:32.183103 138212160636736 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0419 10:15:32.183393 138212160636736 checkpointing.py:677] Setting up checkpoint logger... I0419 10:15:32.183449 138212160636736 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0419 10:15:32.183493 138212160636736 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0419 10:15:32.183838 138212160636736 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 0x7db3f1f1d0d0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0419 10:15:35.548065 138212160636736 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0419 10:15:35.548306 138212160636736 checkpoint_manager.py:709] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7db24178b860>}, handler_registry=None I0419 10:15:35.548542 138212160636736 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7db24178b860>` 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`. I0419 10:15:35.548590 138212160636736 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d9ec4713440>` 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`. I0419 10:15:35.548626 138212160636736 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 0x7db24178b860>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7db24178b860>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d9ec4713440>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d9ec4713440>}). I0419 10:15:35.549141 138212160636736 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0419 10:15:35.549219 138212160636736 async_checkpointer.py:177] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d9ec4648040> timeout: 600 secs and primary_host=0 for async checkpoint writes I0419 10:15:36.996400 138212160636736 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints I0419 10:15:37.409735 138212160636736 checkpoint_manager.py:929] [process=4][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=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_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d9ec470ebd0> I0419 10:15:37.409911 138212160636736 checkpointing.py:301] Checkpoint manager created! I0419 10:15:38.297093 138212160636736 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0419 10:15:38.297193 138212160636736 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 10:15:38.668184 138212160636736 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 10:15:38.668282 138212160636736 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 10:15:38.683887 138212160636736 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0419 10:15:38.683961 138212160636736 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0419 10:15:38.706621 138212160636736 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 10:15:38.706687 138212160636736 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 10:15:38.722431 138212160636736 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 10:15:38.722491 138212160636736 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 10:15:38.738113 138212160636736 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0419 10:15:38.738169 138212160636736 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 10:15:38.762740 138212160636736 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0419 10:15:38.762813 138212160636736 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0419 10:15:38.782224 138212160636736 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0419 10:15:38.782289 138212160636736 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0419 10:15:38.975492 138212160636736 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0419 10:15:38.975605 138212160636736 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0419 10:15:40.395979 138212160636736 maxtext_utils.py:1501] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0419 10:15:40.396116 138212160636736 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) I0419 10:15:40.396169 138212160636736 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) I0419 10:15:40.396227 138212160636736 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') I0419 10:15:40.396279 138212160636736 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) I0419 10:15:40.396316 138212160636736 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) I0419 10:15:40.396366 138212160636736 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) I0419 10:15:40.396415 138212160636736 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') I0419 10:15:40.396453 138212160636736 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) I0419 10:15:40.396488 138212160636736 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) I0419 10:15:40.396533 138212160636736 maxtext_utils.py:1501] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0419 10:15:40.396577 138212160636736 maxtext_utils.py:1501] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0419 10:15:40.892634 138212160636736 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0419 10:15:40.892730 138212160636736 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0419 10:15:40.907415 138212160636736 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0419 10:15:40.907472 138212160636736 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0419 10:15:51.423222 138212160636736 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. I0419 10:15:51.424158 138212160636736 metric_logger.py:289] number parameters: 1.104 billion I0419 10:16:02.440343 138212160636736 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0419 10:16:03.023106 138212160636736 checkpointing.py:776] Waited 0.5827450752258301 seconds for step 0 to finish before starting checkpointing. I0419 10:16:03.025616 138212160636736 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 10:16:03.027303 138212160636736 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 0 I0419 10:16:03.030282 138212160636736 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/0. I0419 10:16:03.617230 138212160636736 signaling_client.py:364] Using JaxDistributedSignalingClient I0419 10:16:03.618307 138212160636736 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0419 10:16:03.618365 138212160636736 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 I0419 10:16:03.865608 138212160636736 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.248456s I0419 10:16:03.865785 138212160636736 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.061 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5040171146392822 s) (per-host) I0419 10:16:03.865838 138212160636736 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.504080s (batch_requests_ready=0.251952s, total_serialization_initiated=0.252057s, others=0.000071s) I0419 10:16:03.865934 138212160636736 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.508129s (all_items=0.000019s, per_item={'items': '0.00001907'}, temp_paths=0.508110) I0419 10:16:03.866961 138089003464448 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0419 10:16:03.867129 138212160636736 async_checkpointer.py:561] Finished blocking save. Time taken: 0.839752s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/0. I0419 10:16:03.916375 138212160636736 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0419 10:16:03.916681 138083626362624 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0419 10:16:03.916851 138212160636736 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776593763.0255978, 'wait_for_prev_duration_secs': 6.198883056640625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776593763.027344, 'checkpointer_blocking_duration_secs': 0.839893102645874, 'get_old_steps_start_time': 1776593763.8672574, 'get_old_steps_duration_secs': 2.6941299438476562e-05, 'checkpoint_manager_blocking_start_time': 1776593763.0235903, 'checkpoint_manager_blocking_duration_secs': 0.8932209014892578} I0419 10:16:03.916971 138212160636736 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0419 10:16:03.917023 138212160636736 max_utils.py:750] Memstats: After params initialized: I0419 10:16:03.917078 138212160636736 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0)) I0419 10:16:03.917113 138212160636736 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0)) I0419 10:16:03.917141 138212160636736 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0)) I0419 10:16:03.917167 138212160636736 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0)) I0419 10:16:04.185523 138212160636736 metric_logger.py:185] completed step: 0, seconds: 11.016, TFLOP/s/device: 1.233, Tokens/s/device: 185.910, total_weights: 65536, loss: 10.874 I0419 10:16:04.360480 138212160636736 metric_logger.py:185] completed step: 1, seconds: 1.744, TFLOP/s/device: 7.791, Tokens/s/device: 1174.401, total_weights: 65536, loss: 10.874 I0419 10:16:04.744139 138212160636736 metric_logger.py:185] completed step: 2, seconds: 0.028, TFLOP/s/device: 487.238, Tokens/s/device: 73441.870, total_weights: 65536, loss: 10.560 I0419 10:16:04.891696 138212160636736 metric_logger.py:185] completed step: 3, seconds: 0.384, TFLOP/s/device: 35.372, Tokens/s/device: 5331.667, total_weights: 65536, loss: 9.980 I0419 10:16:04.896237 138212160636736 checkpointing.py:772] Waiting for step 5 to finish before checkpoint... I0419 10:16:05.186708 138212160636736 checkpointing.py:776] Waited 0.2904329299926758 seconds for step 5 to finish before starting checkpointing. I0419 10:16:05.189475 138212160636736 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 10:16:07.274496 2605 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0419 10:16:09.527500 138089011857152 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/0/items/array_metadatas/process_4 I0419 10:16:40.494261 138089003464448 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 42.540 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.13245487213135 s) (per-host) I0419 10:16:40.494367 138089003464448 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.627295s. I0419 10:16:49.621518 138089003464448 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 45.754430s. I0419 10:16:49.621800 138083626362624 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 10:16:49.621923 138083626362624 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0419 10:16:49.622007 138083626362624 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0419 10:16:49.623445 138083626362624 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0419 10:16:49.623620 138212160636736 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0419 10:16:49.623754 138212160636736 checkpoint_manager.py:1458] Waiting for previous save to complete took 44.434283 seconds. If this number is high, consider checkpointing less frequently. I0419 10:16:49.625753 138212160636736 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 5 I0419 10:16:49.629813 138212160636736 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/5. I0419 10:16:51.030445 138212160636736 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0419 10:16:51.030542 138212160636736 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 I0419 10:16:51.073964 138212160636736 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044705s I0419 10:16:51.074136 138212160636736 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.086 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.7394659519195557 s) (per-host) I0419 10:16:51.074190 138212160636736 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.739530s (batch_requests_ready=0.692917s, total_serialization_initiated=0.046541s, others=0.000073s) I0419 10:16:51.074283 138212160636736 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.744416s (all_items=0.000016s, per_item={'items': '0.00001597'}, temp_paths=0.744400) I0419 10:16:51.075233 138084154595072 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0419 10:16:51.075395 138212160636736 async_checkpointer.py:561] Finished blocking save. Time taken: 1.449566s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/5. I0419 10:16:51.077454 138212160636736 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0419 10:16:51.077721 138083626362624 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0419 10:16:51.077888 138212160636736 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776593765.189448, 'wait_for_prev_duration_secs': 44.4342827796936, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776593809.6257899, 'checkpointer_blocking_duration_secs': 1.4497137069702148, 'get_old_steps_start_time': 1776593811.0755212, 'get_old_steps_duration_secs': 2.574920654296875e-05, 'checkpoint_manager_blocking_start_time': 1776593765.1874523, 'checkpoint_manager_blocking_duration_secs': 45.890401124954224} I0419 10:16:51.078015 138212160636736 checkpointing.py:408] Started an asynchronous checkpoint save for step 5 I0419 10:16:51.078519 138212160636736 metric_logger.py:185] completed step: 4, seconds: 0.152, TFLOP/s/device: 89.170, Tokens/s/device: 13440.613, total_weights: 65536, loss: 9.460 I0419 10:16:51.084363 138212160636736 metric_logger.py:185] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.088, Tokens/s/device: 13880.511, total_weights: 65536, loss: 8.959 I0419 10:17:10.195544 138212160636736 metric_logger.py:185] completed step: 6, seconds: 46.187, TFLOP/s/device: 0.294, Tokens/s/device: 44.342, total_weights: 65536, loss: 8.469 I0419 10:17:10.342905 138212160636736 metric_logger.py:185] completed step: 7, seconds: 18.965, TFLOP/s/device: 0.716, Tokens/s/device: 107.986, total_weights: 65536, loss: 8.003 I0419 10:17:10.490425 138212160636736 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.503, Tokens/s/device: 13490.814, total_weights: 65536, loss: 7.572 I0419 10:17:10.637498 138212160636736 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0419 10:17:10.638162 138212160636736 checkpointing.py:776] Waited 0.0006837844848632812 seconds for step 9 to finish before starting checkpointing. I0419 10:17:10.640079 138212160636736 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 10:17:13.579541 138082552620800 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/5/items/array_metadatas/process_4 I0419 10:17:51.599569 138084154595072 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 25.783 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 61.26486039161682 s) (per-host) I0419 10:17:51.599699 138084154595072 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 60.524352s. I0419 10:17:58.213190 138084154595072 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 67.137827s. I0419 10:17:58.213481 138083626362624 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 10:17:58.213622 138083626362624 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0419 10:17:58.213669 138083626362624 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0419 10:17:58.214975 138083626362624 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0419 10:17:58.215148 138212160636736 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5. W0419 10:17:58.215282 138212160636736 checkpoint_manager.py:1458] Waiting for previous save to complete took 47.575215 seconds. If this number is high, consider checkpointing less frequently. I0419 10:17:58.216885 138212160636736 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 9 I0419 10:17:58.220332 138212160636736 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/9. I0419 10:17:59.166818 138212160636736 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0419 10:17:59.166909 138212160636736 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 I0419 10:17:59.210359 138212160636736 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044488s I0419 10:17:59.210521 138212160636736 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.261 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29320383071899414 s) (per-host) I0419 10:17:59.210571 138212160636736 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.293262s (batch_requests_ready=0.246754s, total_serialization_initiated=0.046445s, others=0.000063s) I0419 10:17:59.210668 138212160636736 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.297191s (all_items=0.000010s, per_item={'items': '0.00001001'}, temp_paths=0.297181) I0419 10:17:59.211491 138083662386944 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0419 10:17:59.211591 138212160636736 async_checkpointer.py:561] Finished blocking save. Time taken: 0.994640s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/9. I0419 10:17:59.231434 138212160636736 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0419 10:17:59.231734 138083626362624 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0419 10:17:59.231903 138212160636736 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776593830.64005, 'wait_for_prev_duration_secs': 47.575215101242065, 'time_between_consecutive_saves_sec': 21.016566276550293, 'checkpointer_blocking_start_time': 1776593878.2169232, 'checkpointer_blocking_duration_secs': 0.994774580001831, 'get_old_steps_start_time': 1776593879.2117105, 'get_old_steps_duration_secs': 1.9311904907226562e-05, 'checkpoint_manager_blocking_start_time': 1776593830.638386, 'checkpoint_manager_blocking_duration_secs': 48.59348464012146} I0419 10:17:59.232032 138212160636736 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0419 10:17:59.232074 138212160636736 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0419 10:18:04.412932 138089004001024 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_16_zarr3_true/checkpoints/9/items/array_metadatas/process_4 I0419 10:18:40.684441 138083662386944 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 37.819 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.76708149909973 s) (per-host) I0419 10:18:40.684557 138083662386944 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.473008s. I0419 10:18:49.069505 138083662386944 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 49.857941s. I0419 10:18:49.069800 138083626362624 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0419 10:18:49.069922 138083626362624 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0419 10:18:49.069980 138083626362624 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0419 10:18:49.071374 138083626362624 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0419 10:18:49.071536 138212160636736 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0419 10:18:49.071681 138212160636736 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0419 10:18:49.072325 138212160636736 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.223, Tokens/s/device: 13900.861, 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: Sun Apr 19 10:19:00 UTC 2026 EXIT_CODE=0