XPK Start: Sat Apr 25 16:19:45 UTC 2026 2026-04-25 16:19:49.375014: 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 00:00:1777133989.387815 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1777133989.391533 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1777133989.403020 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777133989.403040 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777133989.403042 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777133989.403044 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-25 16:20:08.551112: 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) I0425 16:20:09.082034 132860367845184 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-25 16:20:18,122:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0425 16:20:18.122858 132860367845184 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-25 16:20:18,125:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-true-rs-1bwv1-slice-job-0-0.mt-16-zarr3-true-rs-1bwv1:8482 I0425 16:20:18.125195 132860367845184 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-true-rs-1bwv1-slice-job-0-0.mt-16-zarr3-true-rs-1bwv1:8482 I0425 16:20:19.229493 132860367845184 max_utils.py:284] Jax distributed system initialized! I0425 16:20:25.902996 132860367845184 max_utils.py:800] System Information: Jax Version: 0.8.1 I0425 16:20:25.903101 132860367845184 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0425 16:20:25.903141 132860367845184 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 I0425 16:20:25.903176 132860367845184 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0425 16:20:26.539967 132860367845184 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0425 16:20:26.540574 132860367845184 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0425 16:20:26.540756 132860367845184 checkpointing.py:688] Setting up checkpoint logger... I0425 16:20:26.540808 132860367845184 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0425 16:20:26.540852 132860367845184 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0425 16:20:26.541257 132860367845184 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 0x78d58c1b0e00>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0425 16:20:27.853000 132860367845184 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0425 16:20:27.853362 132860367845184 checkpoint_manager.py:709] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78c399b91eb0>}, handler_registry=None I0425 16:20:27.853610 132860367845184 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78c399b91eb0>` 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`. I0425 16:20:27.853662 132860367845184 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78c399b96060>` 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`. I0425 16:20:27.853697 132860367845184 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 0x78c399b91eb0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78c399b91eb0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78c399b96060>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78c399b96060>}). I0425 16:20:27.854223 132860367845184 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0425 16:20:27.854304 132860367845184 async_checkpointer.py:177] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x78c2a36a8180> timeout: 600 secs and primary_host=0 for async checkpoint writes I0425 16:20:29.971604 132744134776576 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1777133812385284716, 'commit_timestamp_nsecs': 1777133858837150802, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/5/_CHECKPOINT_METADATA I0425 16:20:30.216129 132744134776576 checkpoint_manager.py:1877] Missing metrics for step 5 I0425 16:20:30.437340 132860367845184 checkpoint_manager.py:1818] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints I0425 16:20:30.439768 132860367845184 checkpoint_manager.py:929] [process=3][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_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x78c399b91820> I0425 16:20:30.439884 132860367845184 checkpointing.py:302] Checkpoint manager created! I0425 16:20:31.335180 132860367845184 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0425 16:20:31.335289 132860367845184 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0425 16:20:31.709408 132860367845184 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0425 16:20:31.709503 132860367845184 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0425 16:20:31.725409 132860367845184 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0425 16:20:31.725470 132860367845184 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0425 16:20:31.748299 132860367845184 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0425 16:20:31.748373 132860367845184 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0425 16:20:31.764291 132860367845184 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0425 16:20:31.764353 132860367845184 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0425 16:20:31.780195 132860367845184 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0425 16:20:31.780256 132860367845184 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0425 16:20:31.805422 132860367845184 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0425 16:20:31.805499 132860367845184 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0425 16:20:31.825052 132860367845184 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0425 16:20:31.825119 132860367845184 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0425 16:20:32.015770 132860367845184 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0425 16:20:32.015882 132860367845184 checkpointing.py:582] restoring from this run's directory step 9 I0425 16:20:32.503964 132860367845184 checkpointer.py:304] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/9. I0425 16:20:33.945486 1375 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0425 16:20:39.364862 132860367845184 jax_array_handlers.py:837] [process=3] /jax/orbax/read/worker/io/requested throughput: 291.322 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 5.424484491348267 s) (per-host) I0425 16:20:39.380159 132860367845184 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/read/gbytes_per_sec: 268.947 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 5.88440728187561 s) (per-host) I0425 16:20:40.747984 132860367845184 checkpointer.py:318] Finished restoring checkpoint in 8.48 seconds from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/9. I0425 16:20:40.748143 132860367845184 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints', 'checkpointer_start_time': 1777134032.2652192, 'checkpointer_duration_secs': 8.48289155960083, 'checkpoint_manager_start_time': 1777134032.0161495, 'checkpoint_manager_duration_secs': 8.731963396072388} fsdp: 32 I0425 16:20:41.153750 132860367845184 maxtext_utils.py:1740] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0425 16:20:41.153883 132860367845184 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) I0425 16:20:41.153960 132860367845184 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) I0425 16:20:41.154036 132860367845184 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') I0425 16:20:41.154093 132860367845184 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) I0425 16:20:41.154136 132860367845184 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) I0425 16:20:41.154192 132860367845184 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) I0425 16:20:41.154249 132860367845184 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') I0425 16:20:41.154290 132860367845184 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) I0425 16:20:41.154330 132860367845184 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) I0425 16:20:41.154378 132860367845184 maxtext_utils.py:1740] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0425 16:20:41.154429 132860367845184 maxtext_utils.py:1740] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0425 16:20:41.653068 132860367845184 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0425 16:20:41.653164 132860367845184 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0425 16:20:41.668302 132860367845184 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0425 16:20:41.668366 132860367845184 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0425 16:20:52.596914 132860367845184 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. I0425 16:20:52.597812 132860367845184 metric_logger.py:289] number parameters: 1.104 billion I0425 16:21:04.056746 132860367845184 checkpointing.py:794] Waiting for step 10 to finish before checkpoint... I0425 16:21:04.210584 132860367845184 checkpointing.py:798] Waited 0.1538245677947998 seconds for step 10 to finish before starting checkpointing. I0425 16:21:04.213235 132860367845184 checkpoint_manager.py:2013] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0425 16:21:04.215449 132860367845184 checkpoint_manager.py:1518] [process=3] Saving checkpoint at step 10 I0425 16:21:04.218086 132860367845184 async_checkpointer.py:452] [process=3] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/10. I0425 16:21:04.810092 132860367845184 signaling_client.py:364] Using JaxDistributedSignalingClient I0425 16:21:04.811074 132860367845184 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0425 16:21:04.811137 132860367845184 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 I0425 16:21:05.056739 132860367845184 base_pytree_checkpoint_handler.py:153] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.246742s I0425 16:21:05.056912 132860367845184 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.041 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5072276592254639 s) (per-host) I0425 16:21:05.056991 132860367845184 base_pytree_checkpoint_handler.py:737] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.507314s (batch_requests_ready=0.258446s, total_serialization_initiated=0.248774s, others=0.000094s) I0425 16:21:05.057114 132860367845184 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.511485s (all_items=0.000019s, per_item={'items': '0.00001860'}, temp_paths=0.511467) I0425 16:21:05.058134 132744109598464 async_checkpointer.py:79] [process=3][thread=async_save] Background save thread started. I0425 16:21:05.058317 132860367845184 async_checkpointer.py:561] Finished blocking save. Time taken: 0.842794s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/10. I0425 16:21:05.098836 132860367845184 checkpoint_manager.py:1566] [process=3][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize I0425 16:21:05.099168 132736530503424 async_checkpointer.py:265] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0425 16:21:05.099328 132860367845184 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777134064.2132168, 'wait_for_prev_duration_secs': 7.414817810058594e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777134064.2154872, 'checkpointer_blocking_duration_secs': 0.8429470062255859, 'get_old_steps_start_time': 1777134065.058454, 'get_old_steps_duration_secs': 3.409385681152344e-05, 'checkpoint_manager_blocking_start_time': 1777134064.2110884, 'checkpoint_manager_blocking_duration_secs': 0.8882043361663818} I0425 16:21:05.099448 132860367845184 checkpointing.py:409] Started an asynchronous checkpoint save for step 10 I0425 16:21:05.099508 132860367845184 max_utils.py:750] Memstats: After params initialized: I0425 16:21:05.099575 132860367845184 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0)) I0425 16:21:05.099619 132860367845184 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0)) I0425 16:21:05.099655 132860367845184 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0)) I0425 16:21:05.099692 132860367845184 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0)) I0425 16:21:05.363865 132860367845184 metric_logger.py:185] completed step: 10, seconds: 11.459, TFLOP/s/device: 1.186, Tokens/s/device: 178.727, total_weights: 65536, loss: 6.833 I0425 16:21:05.538920 132860367845184 metric_logger.py:185] completed step: 11, seconds: 1.306, TFLOP/s/device: 10.406, Tokens/s/device: 1568.459, total_weights: 65536, loss: 6.528 I0425 16:21:05.686717 132860367845184 metric_logger.py:185] completed step: 12, seconds: 0.028, TFLOP/s/device: 482.429, Tokens/s/device: 72716.944, total_weights: 65536, loss: 6.265 I0425 16:21:05.834284 132860367845184 metric_logger.py:185] completed step: 13, seconds: 0.153, TFLOP/s/device: 88.868, Tokens/s/device: 13395.164, total_weights: 65536, loss: 6.045 I0425 16:21:05.838962 132860367845184 checkpointing.py:794] Waiting for step 15 to finish before checkpoint... I0425 16:21:06.129120 132860367845184 checkpointing.py:798] Waited 0.29012131690979004 seconds for step 15 to finish before starting checkpointing. I0425 16:21:06.132089 132860367845184 checkpoint_manager.py:2024] [process=3][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0425 16:21:09.528487 132738120816384 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/10/items/array_metadatas/process_3 I0425 16:21:46.010972 132744109598464 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/gbytes_per_sec: 38.098 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.461238384246826 s) (per-host) I0425 16:21:46.011091 132744109598464 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.952843s. I0425 16:21:53.862899 132744109598464 async_checkpointer.py:144] [process=3][thread=async_save] Background save thread done. Time taken: 48.804634s. I0425 16:21:53.863208 132736530503424 async_checkpointer.py:273] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0425 16:21:53.863337 132736530503424 async_checkpointer.py:283] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0425 16:21:53.863385 132736530503424 checkpoint_manager.py:2133] [process=3][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts... I0425 16:21:53.864835 132736530503424 checkpoint_manager.py:2142] [process=3][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts. I0425 16:21:53.865029 132860367845184 checkpoint_manager.py:2036] [process=3][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10. W0425 16:21:53.865164 132860367845184 checkpoint_manager.py:1458] Waiting for previous save to complete took 47.733080 seconds. If this number is high, consider checkpointing less frequently. I0425 16:21:53.867191 132860367845184 checkpoint_manager.py:1518] [process=3] Saving checkpoint at step 15 I0425 16:21:53.871588 132860367845184 async_checkpointer.py:452] [process=3] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/15. I0425 16:21:54.840453 132860367845184 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0425 16:21:54.840559 132860367845184 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 I0425 16:21:54.885076 132860367845184 base_pytree_checkpoint_handler.py:153] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.045888s I0425 16:21:54.885249 132860367845184 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.843 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3185079097747803 s) (per-host) I0425 16:21:54.885303 132860367845184 base_pytree_checkpoint_handler.py:737] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.318572s (batch_requests_ready=0.270766s, total_serialization_initiated=0.047735s, others=0.000072s) I0425 16:21:54.885395 132860367845184 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.323301s (all_items=0.000017s, per_item={'items': '0.00001717'}, temp_paths=0.323284) I0425 16:21:54.886366 132737088345856 async_checkpointer.py:79] [process=3][thread=async_save] Background save thread started. I0425 16:21:54.886533 132860367845184 async_checkpointer.py:561] Finished blocking save. Time taken: 1.019268s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/15. I0425 16:21:55.322154 132860367845184 checkpoint_manager.py:1566] [process=3][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize I0425 16:21:55.322533 132736530503424 async_checkpointer.py:265] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0425 16:21:55.322722 132860367845184 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777134066.1320596, 'wait_for_prev_duration_secs': 47.73307967185974, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777134113.8672318, 'checkpointer_blocking_duration_secs': 1.0194125175476074, 'get_old_steps_start_time': 1777134114.886665, 'get_old_steps_duration_secs': 2.6464462280273438e-05, 'checkpoint_manager_blocking_start_time': 1777134066.129761, 'checkpoint_manager_blocking_duration_secs': 49.19292402267456} I0425 16:21:55.322848 132860367845184 checkpointing.py:409] Started an asynchronous checkpoint save for step 15 I0425 16:21:55.323519 132860367845184 metric_logger.py:185] completed step: 14, seconds: 0.148, TFLOP/s/device: 91.990, Tokens/s/device: 13865.663, total_weights: 65536, loss: 5.864 I0425 16:21:55.329247 132860367845184 metric_logger.py:185] completed step: 15, seconds: 0.148, TFLOP/s/device: 92.056, Tokens/s/device: 13875.715, total_weights: 65536, loss: 5.719 I0425 16:22:13.262196 132860367845184 metric_logger.py:185] completed step: 16, seconds: 49.489, TFLOP/s/device: 0.275, Tokens/s/device: 41.383, total_weights: 65536, loss: 5.605 I0425 16:22:13.409675 132860367845184 metric_logger.py:185] completed step: 17, seconds: 17.787, TFLOP/s/device: 0.764, Tokens/s/device: 115.141, total_weights: 65536, loss: 5.517 I0425 16:22:13.557179 132860367845184 metric_logger.py:185] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.435, Tokens/s/device: 13480.602, total_weights: 65536, loss: 5.448 I0425 16:22:13.704332 132860367845184 checkpointing.py:794] Waiting for step 19 to finish before checkpoint... I0425 16:22:13.705017 132860367845184 checkpointing.py:798] Waited 0.0007050037384033203 seconds for step 19 to finish before starting checkpointing. I0425 16:22:13.707112 132860367845184 checkpoint_manager.py:2024] [process=3][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0425 16:22:16.643142 132738120816384 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/15/items/array_metadatas/process_3 I0425 16:22:52.340522 132737088345856 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/gbytes_per_sec: 27.341 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 57.77374029159546 s) (per-host) I0425 16:22:52.340647 132737088345856 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 57.454169s. I0425 16:23:00.784475 132737088345856 async_checkpointer.py:144] [process=3][thread=async_save] Background save thread done. Time taken: 65.897982s. I0425 16:23:00.784765 132736530503424 async_checkpointer.py:273] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0425 16:23:00.784885 132736530503424 async_checkpointer.py:283] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0425 16:23:00.784987 132736530503424 checkpoint_manager.py:2133] [process=3][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts... I0425 16:23:00.786478 132736530503424 checkpoint_manager.py:2142] [process=3][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts. I0425 16:23:00.786671 132860367845184 checkpoint_manager.py:2036] [process=3][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15. W0425 16:23:00.786824 132860367845184 checkpoint_manager.py:1458] Waiting for previous save to complete took 47.079722 seconds. If this number is high, consider checkpointing less frequently. I0425 16:23:00.791576 132860367845184 checkpoint_manager.py:1518] [process=3] Saving checkpoint at step 19 I0425 16:23:00.794995 132860367845184 async_checkpointer.py:452] [process=3] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/19. I0425 16:23:01.326882 132860367845184 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0425 16:23:01.326991 132860367845184 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 I0425 16:23:01.369647 132860367845184 base_pytree_checkpoint_handler.py:153] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043793s I0425 16:23:01.369817 132860367845184 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.302 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29091477394104004 s) (per-host) I0425 16:23:01.369866 132860367845184 base_pytree_checkpoint_handler.py:737] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.290973s (batch_requests_ready=0.245097s, total_serialization_initiated=0.045813s, others=0.000063s) I0425 16:23:01.369969 132860367845184 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.295053s (all_items=0.000011s, per_item={'items': '0.00001073'}, temp_paths=0.295043) I0425 16:23:01.370818 132744101205760 async_checkpointer.py:79] [process=3][thread=async_save] Background save thread started. I0425 16:23:01.370988 132860367845184 async_checkpointer.py:561] Finished blocking save. Time taken: 0.579340s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/19. I0425 16:23:01.411150 132860367845184 checkpoint_manager.py:1566] [process=3][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize I0425 16:23:01.411484 132736530503424 async_checkpointer.py:265] [process=3][thread=save_finalize] Waiting for background save thread=async_save. I0425 16:23:01.411648 132860367845184 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777134133.707085, 'wait_for_prev_duration_secs': 47.07972192764282, 'time_between_consecutive_saves_sec': 19.842210054397583, 'checkpointer_blocking_start_time': 1777134180.791617, 'checkpointer_blocking_duration_secs': 0.5794825553894043, 'get_old_steps_start_time': 1777134181.3711143, 'get_old_steps_duration_secs': 2.2172927856445312e-05, 'checkpoint_manager_blocking_start_time': 1777134133.7052407, 'checkpoint_manager_blocking_duration_secs': 47.706374645233154} I0425 16:23:01.411759 132860367845184 checkpointing.py:409] Started an asynchronous checkpoint save for step 19 I0425 16:23:01.411803 132860367845184 checkpoint_manager.py:2024] [process=3][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0425 16:23:06.086716 132744109598464 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_16_zarr3_true/checkpoints/19/items/array_metadatas/process_3 I0425 16:23:41.885864 132744101205760 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/gbytes_per_sec: 38.709 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.80693864822388 s) (per-host) I0425 16:23:41.885982 132744101205760 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.515052s. I0425 16:23:50.568149 132744101205760 async_checkpointer.py:144] [process=3][thread=async_save] Background save thread done. Time taken: 49.197205s. I0425 16:23:50.568417 132736530503424 async_checkpointer.py:273] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save. I0425 16:23:50.568542 132736530503424 async_checkpointer.py:283] [process=3][thread=save_finalize] No errors found in background save thread=async_save. I0425 16:23:50.568583 132736530503424 checkpoint_manager.py:2133] [process=3][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts... I0425 16:23:50.570051 132736530503424 checkpoint_manager.py:2142] [process=3][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts. I0425 16:23:50.570250 132860367845184 checkpoint_manager.py:2036] [process=3][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19. I0425 16:23:50.570406 132860367845184 checkpoint_manager.py:2013] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0425 16:23:50.571081 132860367845184 metric_logger.py:185] completed step: 19, seconds: 0.147, TFLOP/s/device: 92.191, Tokens/s/device: 13895.957, 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: Sat Apr 25 16:24:00 UTC 2026 EXIT_CODE=0