XPK Start: Thu Apr 23 17:23:18 UTC 2026 2026-04-23 17:23:22.608963: 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 00:00:1776965002.622725 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1776965002.626497 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1776965002.638230 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776965002.638251 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776965002.638254 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1776965002.638256 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-23 17:23:41.937250: 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) I0423 17:23:42.473367 135903782836032 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-23 17:23:51,514:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0423 17:23:51.514538 135903782836032 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-23 17:23:51,516:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-false-sv-pec8o-slice-job-0-0.mt-16-zarr3-false-sv-pec8o:8482 I0423 17:23:51.516915 135903782836032 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-false-sv-pec8o-slice-job-0-0.mt-16-zarr3-false-sv-pec8o:8482 I0423 17:23:52.427517 135903782836032 max_utils.py:284] Jax distributed system initialized! I0423 17:23:59.305235 135903782836032 max_utils.py:800] System Information: Jax Version: 0.8.1 I0423 17:23:59.305341 135903782836032 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0423 17:23:59.305382 135903782836032 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 I0423 17:23:59.305422 135903782836032 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0423 17:23:59.930938 135903782836032 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0423 17:23:59.931543 135903782836032 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0423 17:23:59.931727 135903782836032 checkpointing.py:688] Setting up checkpoint logger... I0423 17:23:59.931777 135903782836032 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=False I0423 17:23:59.931821 135903782836032 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0423 17:23:59.932218 135903782836032 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 0x7b9a07579370>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0423 17:24:02.870247 135903782836032 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0423 17:24:02.870656 135903782836032 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 0x7b86e1c39c10>}, handler_registry=None I0423 17:24:02.870892 135903782836032 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b86e1c39c10>` 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`. I0423 17:24:02.870941 135903782836032 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b86e1c3e5a0>` 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`. I0423 17:24:02.870979 135903782836032 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 0x7b86e1c39c10>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b86e1c39c10>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b86e1c3e5a0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b86e1c3e5a0>}). I0423 17:24:02.871506 135903782836032 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0423 17:24:02.871585 135903782836032 async_checkpointer.py:177] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b84fc1d4180> timeout: 600 secs and primary_host=0 for async checkpoint writes I0423 17:24:03.654278 135903782836032 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints I0423 17:24:03.675367 135903782836032 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_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b86e3285d30> I0423 17:24:03.675499 135903782836032 checkpointing.py:302] Checkpoint manager created! I0423 17:24:04.568737 135903782836032 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0423 17:24:04.568842 135903782836032 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 17:24:04.941385 135903782836032 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 17:24:04.941478 135903782836032 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 17:24:04.957360 135903782836032 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 17:24:04.957420 135903782836032 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 17:24:04.980246 135903782836032 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 17:24:04.980317 135903782836032 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 17:24:04.996287 135903782836032 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 17:24:04.996348 135903782836032 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 17:24:05.012160 135903782836032 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 17:24:05.012218 135903782836032 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 17:24:05.036962 135903782836032 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0423 17:24:05.037031 135903782836032 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 17:24:05.056656 135903782836032 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0423 17:24:05.056722 135903782836032 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0423 17:24:05.247620 135903782836032 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0423 17:24:05.247732 135903782836032 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0423 17:24:06.685956 135903782836032 maxtext_utils.py:1740] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0423 17:24:06.686089 135903782836032 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) I0423 17:24:06.686176 135903782836032 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) I0423 17:24:06.686239 135903782836032 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') I0423 17:24:06.686297 135903782836032 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) I0423 17:24:06.686337 135903782836032 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) I0423 17:24:06.686391 135903782836032 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) I0423 17:24:06.686444 135903782836032 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') I0423 17:24:06.686488 135903782836032 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) I0423 17:24:06.686531 135903782836032 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) I0423 17:24:06.686582 135903782836032 maxtext_utils.py:1740] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0423 17:24:06.686632 135903782836032 maxtext_utils.py:1740] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0423 17:24:07.191301 135903782836032 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0423 17:24:07.191393 135903782836032 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0423 17:24:07.206334 135903782836032 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0423 17:24:07.206393 135903782836032 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0423 17:24:17.989147 135903782836032 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. I0423 17:24:17.990058 135903782836032 metric_logger.py:289] number parameters: 1.104 billion I0423 17:24:29.027245 135903782836032 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0423 17:24:29.434490 135903782836032 checkpointing.py:798] Waited 0.407228946685791 seconds for step 0 to finish before starting checkpointing. I0423 17:24:29.436936 135903782836032 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 17:24:29.438476 135903782836032 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 0 I0423 17:24:29.441673 135903782836032 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/0. I0423 17:24:30.454159 135903782836032 signaling_client.py:364] Using JaxDistributedSignalingClient I0423 17:24:30.455238 135903782836032 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0423 17:24:30.455293 135903782836032 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 I0423 17:24:30.705618 135903782836032 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.251554s I0423 17:24:30.705791 135903782836032 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.800 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5508744716644287 s) (per-host) I0423 17:24:30.705844 135903782836032 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.550938s (batch_requests_ready=0.295748s, total_serialization_initiated=0.255119s, others=0.000071s) I0423 17:24:30.705936 135903782836032 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.555085s (all_items=0.000020s, per_item={'items': '0.00001955'}, temp_paths=0.555066) I0423 17:24:30.706960 135780693440256 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started. I0423 17:24:30.707145 135903782836032 async_checkpointer.py:561] Finished blocking save. Time taken: 1.268599s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/0. I0423 17:24:30.969920 135903782836032 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0423 17:24:30.970321 135776381687552 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0423 17:24:30.970488 135903782836032 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776965069.4369178, 'wait_for_prev_duration_secs': 6.365776062011719e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776965069.4385142, 'checkpointer_blocking_duration_secs': 1.268744707107544, 'get_old_steps_start_time': 1776965070.7072792, 'get_old_steps_duration_secs': 2.6226043701171875e-05, 'checkpoint_manager_blocking_start_time': 1776965069.4350767, 'checkpoint_manager_blocking_duration_secs': 1.5353686809539795} I0423 17:24:30.970595 135903782836032 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0423 17:24:30.970649 135903782836032 max_utils.py:750] Memstats: After params initialized: I0423 17:24:30.970705 135903782836032 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0423 17:24:30.970740 135903782836032 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0423 17:24:30.970767 135903782836032 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0423 17:24:30.970793 135903782836032 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0423 17:24:31.238031 135903782836032 metric_logger.py:185] completed step: 0, seconds: 11.037, TFLOP/s/device: 1.231, Tokens/s/device: 185.557, total_weights: 65536, loss: 10.874 I0423 17:24:31.411494 135903782836032 metric_logger.py:185] completed step: 1, seconds: 2.209, TFLOP/s/device: 6.149, Tokens/s/device: 926.913, total_weights: 65536, loss: 10.874 I0423 17:24:31.840288 135903782836032 metric_logger.py:185] completed step: 2, seconds: 0.026, TFLOP/s/device: 518.969, Tokens/s/device: 78224.667, total_weights: 65536, loss: 10.560 I0423 17:24:31.988013 135903782836032 metric_logger.py:185] completed step: 3, seconds: 0.429, TFLOP/s/device: 31.690, Tokens/s/device: 4776.643, total_weights: 65536, loss: 9.980 I0423 17:24:31.992528 135903782836032 checkpointing.py:794] Waiting for step 5 to finish before checkpoint... I0423 17:24:32.282673 135903782836032 checkpointing.py:798] Waited 0.29010891914367676 seconds for step 5 to finish before starting checkpointing. I0423 17:24:32.285548 135903782836032 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 17:24:33.417217 2592 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0423 17:24:35.338863 135781179954944 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_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/0/items/array_metadatas/process_6 I0423 17:25:10.987269 135780693440256 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 38.685 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.83229851722717 s) (per-host) I0423 17:25:10.987399 135780693440256 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.280326s. I0423 17:25:19.287501 135780693440256 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 48.580412s. I0423 17:25:19.287801 135776381687552 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 17:25:19.287955 135776381687552 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0423 17:25:19.288008 135776381687552 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0423 17:25:19.289408 135776381687552 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0423 17:25:19.289588 135903782836032 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0423 17:25:19.289717 135903782836032 checkpoint_manager.py:1458] Waiting for previous save to complete took 47.004173 seconds. If this number is high, consider checkpointing less frequently. I0423 17:25:19.291711 135903782836032 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 5 I0423 17:25:19.296254 135903782836032 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/5. I0423 17:25:19.842308 135903782836032 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0423 17:25:19.842404 135903782836032 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 I0423 17:25:19.887681 135903782836032 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046765s I0423 17:25:19.887857 135903782836032 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.205 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29639196395874023 s) (per-host) I0423 17:25:19.887911 135903782836032 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.296457s (batch_requests_ready=0.247808s, total_serialization_initiated=0.048577s, others=0.000072s) I0423 17:25:19.888005 135903782836032 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.301162s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.301147) I0423 17:25:19.889025 135781179954944 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started. I0423 17:25:19.889176 135903782836032 async_checkpointer.py:561] Finished blocking save. Time taken: 0.597389s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/5. I0423 17:25:19.908040 135903782836032 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0423 17:25:19.908322 135776381687552 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0423 17:25:19.908459 135903782836032 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776965072.2855191, 'wait_for_prev_duration_secs': 47.004173040390015, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776965119.291751, 'checkpointer_blocking_duration_secs': 0.5976104736328125, 'get_old_steps_start_time': 1776965119.8893826, 'get_old_steps_duration_secs': 2.7894973754882812e-05, 'checkpoint_manager_blocking_start_time': 1776965072.2833865, 'checkpoint_manager_blocking_duration_secs': 47.62503695487976} I0423 17:25:19.908571 135903782836032 checkpointing.py:409] Started an asynchronous checkpoint save for step 5 I0423 17:25:19.909134 135903782836032 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.731, Tokens/s/device: 13374.519, total_weights: 65536, loss: 9.460 I0423 17:25:19.914879 135903782836032 metric_logger.py:185] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.036, Tokens/s/device: 13872.613, total_weights: 65536, loss: 8.959 I0423 17:25:38.976934 135903782836032 metric_logger.py:185] completed step: 6, seconds: 47.921, TFLOP/s/device: 0.284, Tokens/s/device: 42.737, total_weights: 65536, loss: 8.469 I0423 17:25:39.124478 135903782836032 metric_logger.py:185] completed step: 7, seconds: 18.916, TFLOP/s/device: 0.718, Tokens/s/device: 108.268, total_weights: 65536, loss: 8.003 I0423 17:25:39.271859 135903782836032 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.445, Tokens/s/device: 13482.111, total_weights: 65536, loss: 7.572 I0423 17:25:39.418884 135903782836032 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0423 17:25:39.419566 135903782836032 checkpointing.py:798] Waited 0.0007028579711914062 seconds for step 9 to finish before starting checkpointing. I0423 17:25:39.421556 135903782836032 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 17:25:43.421149 135775324731136 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_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/5/items/array_metadatas/process_6 I0423 17:26:20.388117 135781179954944 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 25.982 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 60.79659986495972 s) (per-host) I0423 17:26:20.388236 135781179954944 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 60.498977s. I0423 17:26:27.261203 135781179954944 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 67.371928s. I0423 17:26:27.261445 135776381687552 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 17:26:27.261505 135776381687552 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0423 17:26:27.261554 135776381687552 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0423 17:26:27.264342 135776381687552 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0423 17:26:27.264529 135903782836032 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5. W0423 17:26:27.264665 135903782836032 checkpoint_manager.py:1458] Waiting for previous save to complete took 47.843122 seconds. If this number is high, consider checkpointing less frequently. I0423 17:26:27.266174 135903782836032 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 9 I0423 17:26:27.269609 135903782836032 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/9. I0423 17:26:28.694209 135903782836032 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0423 17:26:28.694309 135903782836032 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 I0423 17:26:28.739031 135903782836032 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046004s I0423 17:26:28.739214 135903782836032 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.046 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.7540280818939209 s) (per-host) I0423 17:26:28.739266 135903782836032 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.754090s (batch_requests_ready=0.706035s, total_serialization_initiated=0.047988s, others=0.000067s) I0423 17:26:28.739359 135903782836032 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.758191s (all_items=0.000011s, per_item={'items': '0.00001073'}, temp_paths=0.758180) I0423 17:26:28.740253 135777967122176 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started. I0423 17:26:28.740382 135903782836032 async_checkpointer.py:561] Finished blocking save. Time taken: 1.474137s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/9. I0423 17:26:28.742418 135903782836032 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0423 17:26:28.742661 135776381687552 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0423 17:26:28.742814 135903782836032 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776965139.4215274, 'wait_for_prev_duration_secs': 47.84312200546265, 'time_between_consecutive_saves_sec': 20.132079124450684, 'checkpointer_blocking_start_time': 1776965187.2662144, 'checkpointer_blocking_duration_secs': 1.4743421077728271, 'get_old_steps_start_time': 1776965188.7405705, 'get_old_steps_duration_secs': 2.0503997802734375e-05, 'checkpoint_manager_blocking_start_time': 1776965139.4197958, 'checkpoint_manager_blocking_duration_secs': 49.32298755645752} I0423 17:26:28.742921 135903782836032 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0423 17:26:28.742963 135903782836032 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 17:26:33.046196 135780693440256 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_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_false/checkpoints/9/items/array_metadatas/process_6 I0423 17:27:08.653367 135777967122176 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 38.841 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.668139934539795 s) (per-host) I0423 17:27:08.653486 135777967122176 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 39.913025s. I0423 17:27:18.977990 135777967122176 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 50.237514s. I0423 17:27:18.978315 135776381687552 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 17:27:18.978440 135776381687552 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0423 17:27:18.978483 135776381687552 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0423 17:27:18.979802 135776381687552 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0423 17:27:18.979986 135903782836032 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0423 17:27:18.980136 135903782836032 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 17:27:18.980875 135903782836032 metric_logger.py:185] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.096, Tokens/s/device: 13881.734, total_weights: 65536, loss: 7.181 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Thu Apr 23 17:27:29 UTC 2026 EXIT_CODE=0