XPK Start: Fri Apr 24 15:07:13 UTC 2026 2026-04-24 15:07:17.583913: 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 00:00:1777043237.596396 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1777043237.600123 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1777043237.611348 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777043237.611365 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777043237.611367 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777043237.611370 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-24 15:07:36.731900: 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) I0424 15:07:37.259340 138441071458112 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-24 15:07:46,301:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0424 15:07:46.301152 138441071458112 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-24 15:07:46,303:jax._src.distributed:157: Connecting to JAX distributed service on mt-04-int8-za2tg-slice-job-0-0.mt-04-int8-za2tg:8482 I0424 15:07:46.303409 138441071458112 distributed.py:157] Connecting to JAX distributed service on mt-04-int8-za2tg-slice-job-0-0.mt-04-int8-za2tg:8482 I0424 15:07:47.684708 138441071458112 max_utils.py:284] Jax distributed system initialized! I0424 15:07:54.671586 138441071458112 max_utils.py:800] System Information: Jax Version: 0.8.1 I0424 15:07:54.671711 138441071458112 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0424 15:07:54.671753 138441071458112 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 I0424 15:07:54.671789 138441071458112 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0424 15:07:55.294133 138441071458112 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0424 15:07:55.294749 138441071458112 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0424 15:07:55.295052 138441071458112 checkpointing.py:688] Setting up checkpoint logger... I0424 15:07:55.295107 138441071458112 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0424 15:07:55.295149 138441071458112 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0424 15:07:55.295488 138441071458112 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 0x7de8d3975070>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0424 15:07:58.225603 138441071458112 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0424 15:07:58.225978 138441071458112 checkpoint_manager.py:709] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7dd5fcb09d00>}, handler_registry=None I0424 15:07:58.226216 138441071458112 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7dd5fcb09d00>` 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`. I0424 15:07:58.226265 138441071458112 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dd5fcb0eb10>` 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`. I0424 15:07:58.226300 138441071458112 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 0x7dd5fcb09d00>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7dd5fcb09d00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dd5fcb0eb10>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dd5fcb0eb10>}). I0424 15:07:58.226826 138441071458112 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0424 15:07:58.226905 138441071458112 async_checkpointer.py:177] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7dd5fc0d8180> timeout: 600 secs and primary_host=0 for async checkpoint writes I0424 15:07:59.200645 138441071458112 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints I0424 15:07:59.478252 138441071458112 checkpoint_manager.py:929] [process=5][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7dd5fcb0a240> I0424 15:07:59.478425 138441071458112 checkpointing.py:302] Checkpoint manager created! I0424 15:08:00.662442 138441071458112 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0424 15:08:00.662550 138441071458112 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 15:08:01.037354 138441071458112 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0424 15:08:01.037444 138441071458112 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 15:08:01.053305 138441071458112 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0424 15:08:01.053363 138441071458112 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 15:08:01.131710 138441071458112 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 15:08:01.131801 138441071458112 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 15:08:01.147800 138441071458112 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 15:08:01.147863 138441071458112 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 15:08:01.163642 138441071458112 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 15:08:01.163713 138441071458112 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 15:08:01.188093 138441071458112 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0424 15:08:01.188163 138441071458112 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 15:08:01.269166 138441071458112 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0424 15:08:01.269258 138441071458112 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0424 15:08:01.879811 138441071458112 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0424 15:08:01.879922 138441071458112 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0424 15:08:04.552958 138441071458112 maxtext_utils.py:1740] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0424 15:08:04.553099 138441071458112 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0424 15:08:04.553156 138441071458112 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0424 15:08:04.553215 138441071458112 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0424 15:08:04.553271 138441071458112 maxtext_utils.py:1740] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0424 15:08:04.553312 138441071458112 maxtext_utils.py:1740] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0424 15:08:04.553366 138441071458112 maxtext_utils.py:1740] 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) I0424 15:08:04.553420 138441071458112 maxtext_utils.py:1740] 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') I0424 15:08:04.553460 138441071458112 maxtext_utils.py:1740] 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) I0424 15:08:04.553497 138441071458112 maxtext_utils.py:1740] 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) I0424 15:08:04.553546 138441071458112 maxtext_utils.py:1740] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0424 15:08:04.553594 138441071458112 maxtext_utils.py:1740] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0424 15:08:06.269335 138441071458112 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0424 15:08:06.269433 138441071458112 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0424 15:08:06.284370 138441071458112 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0424 15:08:06.284432 138441071458112 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0424 15:08:20.324487 138441071458112 max_utils.py:791] Total memory size: 1.8 GB, Output size: 0.4 GB, Temp size: 1.4 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0424 15:08:20.325640 138441071458112 metric_logger.py:289] number parameters: 1.104 billion I0424 15:08:35.277450 138441071458112 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0424 15:08:35.518733 138441071458112 checkpointing.py:798] Waited 0.24126195907592773 seconds for step 0 to finish before starting checkpointing. I0424 15:08:35.521353 138441071458112 checkpoint_manager.py:2013] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0424 15:08:35.523319 138441071458112 checkpoint_manager.py:1518] [process=5] Saving checkpoint at step 0 I0424 15:08:35.526092 138441071458112 async_checkpointer.py:452] [process=5] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints/0. I0424 15:08:36.120328 138441071458112 signaling_client.py:364] Using JaxDistributedSignalingClient I0424 15:08:36.121314 138441071458112 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0424 15:08:36.121373 138441071458112 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 I0424 15:08:36.372306 138441071458112 base_pytree_checkpoint_handler.py:153] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.252059s I0424 15:08:36.372472 138441071458112 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.008 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5127687454223633 s) (per-host) I0424 15:08:36.372526 138441071458112 base_pytree_checkpoint_handler.py:737] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.512833s (batch_requests_ready=0.257065s, total_serialization_initiated=0.255697s, others=0.000071s) I0424 15:08:36.372616 138441071458112 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.517352s (all_items=0.000020s, per_item={'items': '0.00002003'}, temp_paths=0.517332) I0424 15:08:36.373535 138309087000320 async_checkpointer.py:79] [process=5][thread=async_save] Background save thread started. I0424 15:08:36.373710 138441071458112 async_checkpointer.py:561] Finished blocking save. Time taken: 0.850318s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints/0. I0424 15:08:36.408573 138441071458112 checkpoint_manager.py:1566] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0424 15:08:36.408899 138308499773184 async_checkpointer.py:265] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0424 15:08:36.409047 138441071458112 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777043315.5213363, 'wait_for_prev_duration_secs': 6.389617919921875e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777043315.523358, 'checkpointer_blocking_duration_secs': 0.8504576683044434, 'get_old_steps_start_time': 1777043316.3738356, 'get_old_steps_duration_secs': 2.5510787963867188e-05, 'checkpoint_manager_blocking_start_time': 1777043315.5193837, 'checkpoint_manager_blocking_duration_secs': 0.8896214962005615} I0424 15:08:36.409155 138441071458112 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0424 15:08:36.409207 138441071458112 max_utils.py:750] Memstats: After params initialized: I0424 15:08:36.409268 138441071458112 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0)) I0424 15:08:36.409304 138441071458112 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0)) I0424 15:08:36.409332 138441071458112 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0)) I0424 15:08:36.409357 138441071458112 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0)) I0424 15:08:36.684440 138441071458112 metric_logger.py:185] completed step: 0, seconds: 14.952, TFLOP/s/device: 0.909, Tokens/s/device: 136.975, total_weights: 65536, loss: 10.874 I0424 15:08:36.940637 138441071458112 metric_logger.py:185] completed step: 1, seconds: 1.406, TFLOP/s/device: 9.666, Tokens/s/device: 1456.975, total_weights: 65536, loss: 10.874 I0424 15:08:37.367620 138441071458112 metric_logger.py:185] completed step: 2, seconds: 0.027, TFLOP/s/device: 499.766, Tokens/s/device: 75330.121, total_weights: 65536, loss: 10.262 I0424 15:08:37.597437 138441071458112 metric_logger.py:185] completed step: 3, seconds: 0.428, TFLOP/s/device: 31.767, Tokens/s/device: 4788.336, total_weights: 65536, loss: 9.731 I0424 15:08:38.057865 138441071458112 metric_logger.py:185] completed step: 4, seconds: 0.234, TFLOP/s/device: 57.998, Tokens/s/device: 8742.162, total_weights: 65536, loss: 9.272 I0424 15:08:38.063567 138441071458112 metric_logger.py:185] completed step: 5, seconds: 0.230, TFLOP/s/device: 59.132, Tokens/s/device: 8913.067, total_weights: 65536, loss: 8.887 I0424 15:09:00.199893 138441071458112 metric_logger.py:185] completed step: 6, seconds: 0.461, TFLOP/s/device: 29.488, Tokens/s/device: 4444.811, total_weights: 65536, loss: 8.588 I0424 15:09:00.429645 138441071458112 metric_logger.py:185] completed step: 7, seconds: 21.908, TFLOP/s/device: 0.620, Tokens/s/device: 93.481, total_weights: 65536, loss: 8.380 I0424 15:09:00.660099 138441071458112 metric_logger.py:185] completed step: 8, seconds: 0.234, TFLOP/s/device: 58.156, Tokens/s/device: 8765.922, total_weights: 65536, loss: 8.251 I0424 15:09:00.890448 138441071458112 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0424 15:09:00.891226 138441071458112 checkpointing.py:798] Waited 0.0007948875427246094 seconds for step 9 to finish before starting checkpointing. I0424 15:09:00.893185 138441071458112 checkpoint_manager.py:2024] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 15:09:00.974881 2789 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0424 15:09:02.904927 138310641940224 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints/0/items/array_metadatas/process_5 I0424 15:09:31.754297 138309087000320 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/gbytes_per_sec: 28.260 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 55.894556522369385 s) (per-host) I0424 15:09:31.754400 138309087000320 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 55.380758s. I0424 15:09:39.900014 138309087000320 async_checkpointer.py:144] [process=5][thread=async_save] Background save thread done. Time taken: 63.526357s. I0424 15:09:39.900264 138308499773184 async_checkpointer.py:273] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 15:09:39.900330 138308499773184 async_checkpointer.py:283] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0424 15:09:39.900377 138308499773184 checkpoint_manager.py:2133] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0424 15:09:39.902172 138308499773184 checkpoint_manager.py:2142] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0424 15:09:39.902390 138441071458112 checkpoint_manager.py:2036] [process=5][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0424 15:09:39.902538 138441071458112 checkpoint_manager.py:1458] Waiting for previous save to complete took 39.009356 seconds. If this number is high, consider checkpointing less frequently. I0424 15:09:39.904324 138441071458112 checkpoint_manager.py:1518] [process=5] Saving checkpoint at step 9 I0424 15:09:39.907697 138441071458112 async_checkpointer.py:452] [process=5] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints/9. I0424 15:09:40.827411 138441071458112 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0424 15:09:40.827513 138441071458112 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 I0424 15:09:40.873517 138441071458112 base_pytree_checkpoint_handler.py:153] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.047208s I0424 15:09:40.873693 138441071458112 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.928 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.31302690505981445 s) (per-host) I0424 15:09:40.873743 138441071458112 base_pytree_checkpoint_handler.py:737] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.313086s (batch_requests_ready=0.263946s, total_serialization_initiated=0.049075s, others=0.000065s) I0424 15:09:40.873831 138441071458112 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.317068s (all_items=0.000014s, per_item={'items': '0.00001431'}, temp_paths=0.317054) I0424 15:09:40.874644 138311754569472 async_checkpointer.py:79] [process=5][thread=async_save] Background save thread started. I0424 15:09:40.874822 138441071458112 async_checkpointer.py:561] Finished blocking save. Time taken: 0.970422s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints/9. I0424 15:09:40.876674 138441071458112 checkpoint_manager.py:1566] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0424 15:09:40.876961 138308499773184 async_checkpointer.py:265] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0424 15:09:40.877104 138441071458112 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777043340.893156, 'wait_for_prev_duration_secs': 39.0093560218811, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777043379.9043646, 'checkpointer_blocking_duration_secs': 0.9705696105957031, 'get_old_steps_start_time': 1777043380.8749518, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1777043340.8914957, 'checkpoint_manager_blocking_duration_secs': 39.98557114601135} I0424 15:09:40.877275 138441071458112 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0424 15:09:40.877330 138441071458112 checkpoint_manager.py:2024] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 15:09:45.959035 138311762962176 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_04_int8/checkpoints/9/items/array_metadatas/process_5 I0424 15:10:22.741797 138311754569472 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/gbytes_per_sec: 37.448 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.18108677864075 s) (per-host) I0424 15:10:22.741913 138311754569472 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.867144s. I0424 15:10:30.683640 138311754569472 async_checkpointer.py:144] [process=5][thread=async_save] Background save thread done. Time taken: 49.808854s. I0424 15:10:30.683939 138308499773184 async_checkpointer.py:273] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 15:10:30.684066 138308499773184 async_checkpointer.py:283] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0424 15:10:30.684114 138308499773184 checkpoint_manager.py:2133] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0424 15:10:30.685683 138308499773184 checkpoint_manager.py:2142] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0424 15:10:30.685877 138441071458112 checkpoint_manager.py:2036] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0424 15:10:30.686019 138441071458112 checkpoint_manager.py:2013] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0424 15:10:30.686745 138441071458112 metric_logger.py:185] completed step: 9, seconds: 0.230, TFLOP/s/device: 59.170, Tokens/s/device: 8918.734, total_weights: 65536, loss: 8.175 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Fri Apr 24 15:10:44 UTC 2026 EXIT_CODE=0