XPK Start: Fri Apr 24 16:26:33 UTC 2026 2026-04-24 16:26:37.530000: 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 00:00:1777047997.543114 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1777047997.546841 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1777047997.558503 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777047997.558523 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777047997.558526 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777047997.558528 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-24 16:26:56.761766: 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 16:26:57.291924 132043629082432 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-24 16:27:06,334:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0424 16:27:06.334558 132043629082432 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-24 16:27:06,340:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-false-rs-fno2p-slice-job-0-0.mt-16-zarr3-false-rs-fno2p:8482 I0424 16:27:06.340120 132043629082432 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-false-rs-fno2p-slice-job-0-0.mt-16-zarr3-false-rs-fno2p:8482 I0424 16:27:07.322661 132043629082432 max_utils.py:284] Jax distributed system initialized! I0424 16:27:14.430495 132043629082432 max_utils.py:800] System Information: Jax Version: 0.8.1 I0424 16:27:14.430600 132043629082432 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0424 16:27:14.430641 132043629082432 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 16:27:14.430675 132043629082432 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0424 16:27:15.051450 132043629082432 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0424 16:27:15.052041 132043629082432 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0424 16:27:15.052253 132043629082432 checkpointing.py:688] Setting up checkpoint logger... I0424 16:27:15.052306 132043629082432 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=False I0424 16:27:15.052349 132043629082432 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0424 16:27:15.052704 132043629082432 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=False, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x78174eb79580>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0424 16:27:16.328484 132043629082432 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0424 16:27:16.328727 132043629082432 checkpoint_manager.py:709] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78029c1a1f10>}, handler_registry=None I0424 16:27:16.328998 132043629082432 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78029c1a1f10>` 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 16:27:16.329066 132043629082432 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78029c309dc0>` 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 16:27:16.329126 132043629082432 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 0x78029c1a1f10>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78029c1a1f10>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78029c309dc0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78029c309dc0>}). I0424 16:27:16.329669 132043629082432 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0424 16:27:16.329750 132043629082432 async_checkpointer.py:177] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x78028439c180> timeout: 600 secs and primary_host=0 for async checkpoint writes I0424 16:27:18.184970 131922705495808 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1777047748963202567, 'commit_timestamp_nsecs': 1777047796298196305, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_16_zarr3_false/checkpoints/0/_CHECKPOINT_METADATA I0424 16:27:18.439201 131922697103104 checkpoint_manager.py:1877] Missing metrics for step 5 I0424 16:27:18.457726 132043629082432 checkpoint_manager.py:1818] Found 3 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_16_zarr3_false/checkpoints I0424 16:27:18.753084 132043629082432 checkpoint_manager.py:929] [process=6][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_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x78029c35d730> I0424 16:27:18.753298 132043629082432 checkpointing.py:302] Checkpoint manager created! I0424 16:27:19.650034 132043629082432 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0424 16:27:19.650151 132043629082432 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 16:27:20.024652 132043629082432 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0424 16:27:20.024745 132043629082432 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 16:27:20.040703 132043629082432 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0424 16:27:20.040763 132043629082432 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 16:27:20.063723 132043629082432 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 16:27:20.063791 132043629082432 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 16:27:20.079982 132043629082432 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 16:27:20.080047 132043629082432 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 16:27:20.095937 132043629082432 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 16:27:20.095999 132043629082432 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 16:27:20.120785 132043629082432 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0424 16:27:20.120855 132043629082432 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 16:27:20.140476 132043629082432 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0424 16:27:20.140542 132043629082432 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0424 16:27:20.330333 132043629082432 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0424 16:27:20.330445 132043629082432 checkpointing.py:582] restoring from this run's directory step 9 I0424 16:27:20.833318 132043629082432 checkpointer.py:304] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_16_zarr3_false/checkpoints/9. I0424 16:27:22.232784 1431 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0424 16:27:28.213722 132043629082432 jax_array_handlers.py:837] [process=6] /jax/orbax/read/worker/io/requested throughput: 263.987 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 5.986175298690796 s) (per-host) I0424 16:27:28.229941 132043629082432 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/read/gbytes_per_sec: 247.269 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 6.400290250778198 s) (per-host) I0424 16:27:28.560680 132043629082432 checkpointer.py:318] Finished restoring checkpoint in 7.97 seconds from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_16_zarr3_false/checkpoints/9. I0424 16:27:28.560850 132043629082432 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_16_zarr3_false/checkpoints', 'checkpointer_start_time': 1777048040.5861528, 'checkpointer_duration_secs': 7.974658727645874, 'checkpoint_manager_start_time': 1777048040.3306918, 'checkpoint_manager_duration_secs': 8.230122566223145} fsdp: 32 I0424 16:27:28.972890 132043629082432 maxtext_utils.py:1740] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0424 16:27:28.973019 132043629082432 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 16:27:28.973074 132043629082432 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 16:27:28.973166 132043629082432 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 16:27:28.973235 132043629082432 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 16:27:28.973278 132043629082432 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 16:27:28.973335 132043629082432 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 16:27:28.973390 132043629082432 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 16:27:28.973433 132043629082432 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 16:27:28.973474 132043629082432 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 16:27:28.973525 132043629082432 maxtext_utils.py:1740] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0424 16:27:28.973575 132043629082432 maxtext_utils.py:1740] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0424 16:27:29.473422 132043629082432 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0424 16:27:29.473517 132043629082432 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0424 16:27:29.488494 132043629082432 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0424 16:27:29.488559 132043629082432 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0424 16:27:40.466253 132043629082432 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. I0424 16:27:40.467076 132043629082432 metric_logger.py:289] number parameters: 1.104 billion I0424 16:27:51.793229 132043629082432 checkpointing.py:794] Waiting for step 10 to finish before checkpoint... I0424 16:27:51.946742 132043629082432 checkpointing.py:798] Waited 0.15349745750427246 seconds for step 10 to finish before starting checkpointing. I0424 16:27:51.949054 132043629082432 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0424 16:27:51.950992 132043629082432 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 10 I0424 16:27:51.953619 132043629082432 async_checkpointer.py:452] [process=6] 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_16_zarr3_false/checkpoints/10. I0424 16:27:52.534330 132043629082432 signaling_client.py:364] Using JaxDistributedSignalingClient I0424 16:27:52.536528 132043629082432 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0424 16:27:52.536588 132043629082432 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 16:27:52.790844 132043629082432 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.256611s I0424 16:27:52.791018 132043629082432 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.022 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5104806423187256 s) (per-host) I0424 16:27:52.791073 132043629082432 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.510545s (batch_requests_ready=0.251841s, total_serialization_initiated=0.258632s, others=0.000072s) I0424 16:27:52.791174 132043629082432 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.514854s (all_items=0.000019s, per_item={'items': '0.00001907'}, temp_paths=0.514835) I0424 16:27:52.792181 131922109908736 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started. I0424 16:27:52.792359 132043629082432 async_checkpointer.py:561] Finished blocking save. Time taken: 0.841294s. 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_16_zarr3_false/checkpoints/10. I0424 16:27:52.812215 132043629082432 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize I0424 16:27:52.812546 131917303248640 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0424 16:27:52.812707 132043629082432 standard_logger.py:34] {'step': 10, '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_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777048071.9490361, 'wait_for_prev_duration_secs': 8.440017700195312e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777048071.951032, 'checkpointer_blocking_duration_secs': 0.841437816619873, 'get_old_steps_start_time': 1777048072.7924895, 'get_old_steps_duration_secs': 3.4332275390625e-05, 'checkpoint_manager_blocking_start_time': 1777048071.9472282, 'checkpoint_manager_blocking_duration_secs': 0.8654425144195557} I0424 16:27:52.812814 132043629082432 checkpointing.py:409] Started an asynchronous checkpoint save for step 10 I0424 16:27:52.812868 132043629082432 max_utils.py:750] Memstats: After params initialized: I0424 16:27:52.812916 132043629082432 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0424 16:27:52.812948 132043629082432 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0424 16:27:52.812975 132043629082432 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0424 16:27:52.812999 132043629082432 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0424 16:27:53.080972 132043629082432 metric_logger.py:185] completed step: 10, seconds: 11.326, TFLOP/s/device: 1.200, Tokens/s/device: 180.823, total_weights: 65536, loss: 6.833 I0424 16:27:53.252820 132043629082432 metric_logger.py:185] completed step: 11, seconds: 1.286, TFLOP/s/device: 10.563, Tokens/s/device: 1592.125, total_weights: 65536, loss: 6.528 I0424 16:27:53.400733 132043629082432 metric_logger.py:185] completed step: 12, seconds: 0.025, TFLOP/s/device: 548.487, Tokens/s/device: 82673.987, total_weights: 65536, loss: 6.265 I0424 16:27:53.548124 132043629082432 metric_logger.py:185] completed step: 13, seconds: 0.153, TFLOP/s/device: 88.671, Tokens/s/device: 13365.529, total_weights: 65536, loss: 6.045 I0424 16:27:53.552753 132043629082432 checkpointing.py:794] Waiting for step 15 to finish before checkpoint... I0424 16:27:53.842568 132043629082432 checkpointing.py:798] Waited 0.2897803783416748 seconds for step 15 to finish before starting checkpointing. I0424 16:27:53.845473 132043629082432 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 16:27:57.471590 131918217594624 array_metadata_store.py:203] [process=6][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_16_zarr3_false/checkpoints/10/items/array_metadatas/process_6 I0424 16:28:33.724615 131922109908736 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 38.114 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.44404101371765 s) (per-host) I0424 16:28:33.724718 131922109908736 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.932422s. I0424 16:28:42.423590 131922109908736 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 49.631276s. I0424 16:28:42.423896 131917303248640 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 16:28:42.424017 131917303248640 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0424 16:28:42.424062 131917303248640 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts... I0424 16:28:42.426799 131917303248640 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts. I0424 16:28:42.426964 132043629082432 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10. W0424 16:28:42.427111 132043629082432 checkpoint_manager.py:1458] Waiting for previous save to complete took 48.581631 seconds. If this number is high, consider checkpointing less frequently. I0424 16:28:42.429064 132043629082432 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 15 I0424 16:28:42.433022 132043629082432 async_checkpointer.py:452] [process=6] 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_16_zarr3_false/checkpoints/15. I0424 16:28:42.993986 132043629082432 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0424 16:28:42.994089 132043629082432 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 16:28:43.036982 132043629082432 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044125s I0424 16:28:43.037163 132043629082432 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.078 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3038036823272705 s) (per-host) I0424 16:28:43.037216 132043629082432 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.303866s (batch_requests_ready=0.257672s, total_serialization_initiated=0.046123s, others=0.000071s) I0424 16:28:43.037309 132043629082432 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.308697s (all_items=0.000015s, per_item={'items': '0.00001454'}, temp_paths=0.308683) I0424 16:28:43.039885 131918335026944 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started. I0424 16:28:43.040047 132043629082432 async_checkpointer.py:561] Finished blocking save. Time taken: 0.610892s. 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_16_zarr3_false/checkpoints/15. I0424 16:28:43.050253 132043629082432 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize I0424 16:28:43.050513 131917303248640 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0424 16:28:43.050649 132043629082432 standard_logger.py:34] {'step': 15, '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_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777048073.8454413, 'wait_for_prev_duration_secs': 48.58163070678711, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777048122.429122, 'checkpointer_blocking_duration_secs': 0.6110496520996094, 'get_old_steps_start_time': 1777048123.0401907, 'get_old_steps_duration_secs': 2.8371810913085938e-05, 'checkpoint_manager_blocking_start_time': 1777048073.8432171, 'checkpoint_manager_blocking_duration_secs': 49.2073974609375} I0424 16:28:43.050757 132043629082432 checkpointing.py:409] Started an asynchronous checkpoint save for step 15 I0424 16:28:43.051332 132043629082432 metric_logger.py:185] completed step: 14, seconds: 0.148, TFLOP/s/device: 91.896, Tokens/s/device: 13851.596, total_weights: 65536, loss: 5.864 I0424 16:28:43.057382 132043629082432 metric_logger.py:185] completed step: 15, seconds: 0.147, TFLOP/s/device: 92.284, Tokens/s/device: 13910.020, total_weights: 65536, loss: 5.719 I0424 16:29:00.744416 132043629082432 metric_logger.py:185] completed step: 16, seconds: 49.503, TFLOP/s/device: 0.274, Tokens/s/device: 41.371, total_weights: 65536, loss: 5.605 I0424 16:29:00.891836 132043629082432 metric_logger.py:185] completed step: 17, seconds: 17.541, TFLOP/s/device: 0.775, Tokens/s/device: 116.755, total_weights: 65536, loss: 5.517 I0424 16:29:01.039148 132043629082432 metric_logger.py:185] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.268, Tokens/s/device: 13455.449, total_weights: 65536, loss: 5.448 I0424 16:29:01.186244 132043629082432 checkpointing.py:794] Waiting for step 19 to finish before checkpoint... I0424 16:29:01.186924 132043629082432 checkpointing.py:798] Waited 0.0007007122039794922 seconds for step 19 to finish before starting checkpointing. I0424 16:29:01.188911 132043629082432 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 16:29:05.218654 131918217594624 array_metadata_store.py:203] [process=6][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_16_zarr3_false/checkpoints/15/items/array_metadatas/process_6 I0424 16:29:42.412534 131918335026944 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 26.468 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 59.67913746833801 s) (per-host) I0424 16:29:42.412648 131918335026944 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 59.372651s. I0424 16:29:50.218060 131918335026944 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 67.178048s. I0424 16:29:50.218396 131917303248640 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 16:29:50.218531 131917303248640 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0424 16:29:50.218596 131917303248640 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts... I0424 16:29:50.220690 131917303248640 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts. I0424 16:29:50.220884 132043629082432 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15. W0424 16:29:50.221016 132043629082432 checkpoint_manager.py:1458] Waiting for previous save to complete took 49.032118 seconds. If this number is high, consider checkpointing less frequently. I0424 16:29:50.222630 132043629082432 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 19 I0424 16:29:50.225961 132043629082432 async_checkpointer.py:452] [process=6] 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_16_zarr3_false/checkpoints/19. I0424 16:29:51.179083 132043629082432 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0424 16:29:51.179193 132043629082432 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 16:29:51.223041 132043629082432 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.045012s I0424 16:29:51.223224 132043629082432 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.213 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29588985443115234 s) (per-host) I0424 16:29:51.223278 132043629082432 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.295953s (batch_requests_ready=0.248778s, total_serialization_initiated=0.047107s, others=0.000068s) I0424 16:29:51.223367 132043629082432 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.300003s (all_items=0.000010s, per_item={'items': '0.00001001'}, temp_paths=0.299993) I0424 16:29:51.224271 131922101516032 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started. I0424 16:29:51.224431 132043629082432 async_checkpointer.py:561] Finished blocking save. Time taken: 1.001732s. 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_16_zarr3_false/checkpoints/19. I0424 16:29:51.249436 132043629082432 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize I0424 16:29:51.249725 131917303248640 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0424 16:29:51.249882 132043629082432 standard_logger.py:34] {'step': 19, '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_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777048141.1888824, 'wait_for_prev_duration_secs': 49.03211784362793, 'time_between_consecutive_saves_sec': 18.76203966140747, 'checkpointer_blocking_start_time': 1777048190.2226677, 'checkpointer_blocking_duration_secs': 1.0018763542175293, 'get_old_steps_start_time': 1777048191.2245586, 'get_old_steps_duration_secs': 2.288818359375e-05, 'checkpoint_manager_blocking_start_time': 1777048141.1871622, 'checkpoint_manager_blocking_duration_secs': 50.062690019607544} I0424 16:29:51.249988 132043629082432 checkpointing.py:409] Started an asynchronous checkpoint save for step 19 I0424 16:29:51.250029 132043629082432 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 16:29:55.944678 131922109908736 array_metadata_store.py:203] [process=6][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_16_zarr3_false/checkpoints/19/items/array_metadatas/process_6 I0424 16:30:33.081395 131922101516032 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 37.472 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.154030084609985 s) (per-host) I0424 16:30:33.081499 131922101516032 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.857114s. I0424 16:30:40.974906 131922101516032 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 49.750505s. I0424 16:30:40.975216 131917303248640 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 16:30:40.975351 131917303248640 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0424 16:30:40.975393 131917303248640 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts... I0424 16:30:40.976872 131917303248640 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts. I0424 16:30:40.977030 132043629082432 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19. I0424 16:30:40.977197 132043629082432 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0424 16:30:40.977833 132043629082432 metric_logger.py:185] completed step: 19, seconds: 0.147, TFLOP/s/device: 92.216, Tokens/s/device: 13899.729, total_weights: 65536, loss: 5.391 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Fri Apr 24 16:30:59 UTC 2026 EXIT_CODE=0