XPK Start: Fri Apr 24 21:34:53 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. `rope_parameters`'s factor field must be a float >= 1, got 40 `rope_parameters`'s beta_fast field must be a float, got 32 `rope_parameters`'s beta_slow field must be a float, got 1 DeepseekV32Config got `key=rope_scaling` in kwargs but hasn't set it as attribute. For RoPE standardization you need to set `self.rope_parameters` in model's config. 2026-04-24 21:35:18.857914: 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 21:35:19.071167 137352869230400 max_utils.py:273] Attempting to initialize the jax distributed system... I0424 21:35:28.111872 137352869230400 distributed.py:149] Starting JAX distributed service on [::]:8482 I0424 21:35:28.114359 137352869230400 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-false-rs-csu5l-slice-job-0-0.mt-16-zarr3-false-rs-csu5l:8482 I0424 21:35:29.056781 137352869230400 max_utils.py:284] Jax distributed system initialized! I0424 21:35:36.345138 137352869230400 max_utils.py:800] System Information: Jax Version: 0.9.2 I0424 21:35:36.345240 137352869230400 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0424 21:35:36.345283 137352869230400 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365 I0424 21:35:36.345319 137352869230400 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0424 21:35:37.039160 137352869230400 maxtext_utils.py:1565] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0424 21:35:37.039439 137352869230400 checkpointing.py:677] Setting up checkpoint logger... I0424 21:35:37.039499 137352869230400 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=False I0424 21:35:37.039544 137352869230400 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0424 21:35:37.039890 137352869230400 base_pytree_checkpoint_handler.py:441] 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 0x7ceb3d251be0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0424 21:35:38.344586 137352869230400 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0424 21:35:38.344817 137352869230400 checkpoint_manager.py:708] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cd8c0253e00>}, handler_registry=None I0424 21:35:38.345056 137352869230400 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cd8c0253e00>` 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 21:35:38.345124 137352869230400 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7cd8c02537d0>` 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 21:35:38.345162 137352869230400 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 0x7cd8c0253e00>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cd8c0253e00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7cd8c02537d0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7cd8c02537d0>}). I0424 21:35:38.345496 137352869230400 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0424 21:35:38.345567 137352869230400 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7cd7ebf07560> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0424 21:35:40.181813 137230412658432 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1777066270127131500, 'commit_timestamp_nsecs': 1777066316340623860, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/0/_CHECKPOINT_METADATA I0424 21:35:40.429723 137230412658432 checkpoint_manager.py:1871] Missing metrics for step 0 I0424 21:35:40.877050 137352869230400 checkpoint_manager.py:1812] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints I0424 21:35:40.879606 137352869230400 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_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7cea31186fc0> I0424 21:35:40.879721 137352869230400 checkpointing.py:301] Checkpoint manager created! I0424 21:35:41.810754 137352869230400 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0424 21:35:41.810873 137352869230400 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 21:35:42.193624 137352869230400 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0424 21:35:42.193719 137352869230400 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 21:35:42.210344 137352869230400 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0424 21:35:42.210407 137352869230400 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 21:35:42.233952 137352869230400 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 21:35:42.234021 137352869230400 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 21:35:42.250583 137352869230400 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 21:35:42.250645 137352869230400 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 21:35:42.272581 137352869230400 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 21:35:42.272681 137352869230400 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 21:35:42.297907 137352869230400 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0424 21:35:42.297980 137352869230400 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 21:35:42.319909 137352869230400 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0424 21:35:42.319977 137352869230400 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0424 21:35:42.528503 137352869230400 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0424 21:35:42.528618 137352869230400 checkpointing.py:581] restoring from this run's directory step 9 I0424 21:35:42.769912 137352869230400 event_tracking.py:70] [process=6] [sync] Started load checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/9. I0424 21:35:43.009574 137352869230400 checkpointer.py:307] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/9. I0424 21:35:43.009994 137352869230400 event_tracking.py:125] [process=6] [sync] Finished blocking load in 0.24 seconds. Continuing load @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/9. I0424 21:35:44.424475 1471 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0424 21:35:50.337667 137352869230400 jax_array_handlers.py:843] [process=6] /jax/orbax/read/worker/io/requested throughput: 266.965 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 5.9193949699401855 s) (per-host) I0424 21:35:50.343053 137352869230400 base_pytree_checkpoint_handler.py:130] [process=6] /jax/checkpoint/read/gbytes_per_sec: 250.660 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 6.313704013824463 s) (per-host) I0424 21:35:51.253627 137352869230400 event_tracking.py:138] [process=6] [sync] Finished load in 8.48 seconds @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/9 I0424 21:35:51.253783 137352869230400 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints', 'checkpointer_start_time': 1777066542.7698138, 'checkpointer_duration_secs': 8.483936548233032, 'checkpoint_manager_start_time': 1777066542.5288663, 'checkpoint_manager_duration_secs': 8.724886655807495} fsdp: 32 I0424 21:35:51.669121 137352869230400 maxtext_utils.py:1668] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0424 21:35:51.669276 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0424 21:35:51.669352 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0424 21:35:51.669444 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0424 21:35:51.669529 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0424 21:35:51.669596 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0424 21:35:51.669752 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/self_attention/key/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0424 21:35:51.669842 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/self_attention/out/kernel Shape: float32[16,16,128,2048] Logical: P('heads', 'layers', 'kv', 'embed') Physical: (None, None, None, 'fsdp') I0424 21:35:51.669909 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/self_attention/query/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'q_heads', 'kv') Physical: ('fsdp', None, None, None) I0424 21:35:51.669968 137352869230400 maxtext_utils.py:1668] params/params/decoder/layers/self_attention/value/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0424 21:35:51.670048 137352869230400 maxtext_utils.py:1668] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0424 21:35:51.670139 137352869230400 maxtext_utils.py:1668] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0424 21:35:52.154554 137352869230400 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0424 21:35:52.154645 137352869230400 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0424 21:35:52.170107 137352869230400 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0424 21:35:52.170168 137352869230400 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0424 21:36:03.169243 137352869230400 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 21:36:03.170003 137352869230400 metric_logger.py:301] number parameters: 1.104 billion I0424 21:36:14.994498 137352869230400 checkpointing.py:772] Waiting for step 10 to finish before checkpoint... I0424 21:36:15.146903 137352869230400 checkpointing.py:776] Waited 0.15238285064697266 seconds for step 10 to finish before starting checkpointing. I0424 21:36:15.149116 137352869230400 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0424 21:36:15.151166 137352869230400 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 10 I0424 21:36:15.152547 137352869230400 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/10. I0424 21:36:15.479612 137352869230400 signaling_client.py:364] Using JaxDistributedSignalingClient I0424 21:36:15.480536 137352869230400 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0424 21:36:15.480592 137352869230400 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 21:36:15.761155 137352869230400 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.281621s I0424 21:36:15.761331 137352869230400 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.400 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28565096855163574 s) (per-host) I0424 21:36:15.761384 137352869230400 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.285713s (batch_requests_ready=0.002301s, total_serialization_initiated=0.283342s, others=0.000071s) I0424 21:36:15.761472 137352869230400 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.289823s (all_items=0.000018s, per_item={'items': '0.00001812'}, temp_paths=0.289805) I0424 21:36:15.762246 137352869230400 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.61 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/10. I0424 21:36:15.762602 137229808678656 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-24 21:56:15.762564 I0424 21:36:15.764949 137352869230400 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize I0424 21:36:15.765187 137225538889472 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0424 21:36:15.765300 137352869230400 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777066575.1490808, 'wait_for_prev_duration_secs': 7.62939453125e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777066575.1512053, 'checkpointer_blocking_duration_secs': 0.611548900604248, 'get_old_steps_start_time': 1777066575.7627802, 'get_old_steps_duration_secs': 3.075599670410156e-05, 'checkpoint_manager_blocking_start_time': 1777066575.1472905, 'checkpoint_manager_blocking_duration_secs': 0.6179752349853516} I0424 21:36:15.765409 137352869230400 checkpointing.py:408] Started an asynchronous checkpoint save for step 10 I0424 21:36:15.765459 137352869230400 max_utils.py:750] Memstats: After params initialized: I0424 21:36:15.765510 137352869230400 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0424 21:36:15.765547 137352869230400 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0424 21:36:15.765575 137352869230400 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0424 21:36:15.765599 137352869230400 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0424 21:36:16.078580 137352869230400 metric_logger.py:196] completed step: 10, seconds: 11.824, TFLOP/s/device: 1.149, Tokens/s/device: 173.201, total_weights: 65536, loss: 6.833, lm_loss: 6.833, perplexity: 927.869 I0424 21:36:16.671247 137352869230400 metric_logger.py:196] completed step: 11, seconds: 1.083, TFLOP/s/device: 12.551, Tokens/s/device: 1891.887, total_weights: 65536, loss: 6.527, lm_loss: 6.527, perplexity: 683.659 I0424 21:36:16.818732 137352869230400 metric_logger.py:196] completed step: 12, seconds: 0.446, TFLOP/s/device: 30.434, Tokens/s/device: 4587.351, total_weights: 65536, loss: 6.265, lm_loss: 6.265, perplexity: 526.068 I0424 21:36:16.966148 137352869230400 metric_logger.py:196] completed step: 13, seconds: 0.152, TFLOP/s/device: 89.233, Tokens/s/device: 13450.146, total_weights: 65536, loss: 6.045, lm_loss: 6.045, perplexity: 422.001 I0424 21:36:16.970777 137352869230400 checkpointing.py:772] Waiting for step 15 to finish before checkpoint... I0424 21:36:17.260506 137352869230400 checkpointing.py:776] Waited 0.28969621658325195 seconds for step 15 to finish before starting checkpointing. I0424 21:36:17.263651 137352869230400 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 21:36:20.600419 137228206458624 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/10/items/array_metadatas/process_6 I0424 21:36:57.099709 137229808678656 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.949 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.62399101257324 s) (per-host) I0424 21:36:57.099841 137229808678656 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.337125s. I0424 21:37:05.097651 137229808678656 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 49.334918s. I0424 21:37:05.097894 137225538889472 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 21:37:05.097950 137225538889472 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0424 21:37:05.097997 137225538889472 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts... I0424 21:37:05.099619 137225538889472 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts. I0424 21:37:05.099790 137352869230400 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10. W0424 21:37:05.099926 137352869230400 checkpoint_manager.py:1452] Waiting for previous save to complete took 47.836274 seconds. If this number is high, consider checkpointing less frequently. I0424 21:37:05.101890 137352869230400 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 15 I0424 21:37:05.104281 137352869230400 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/15. I0424 21:37:05.679731 137352869230400 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0424 21:37:05.679831 137352869230400 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 21:37:05.722915 137352869230400 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.045404s I0424 21:37:05.723083 137352869230400 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 31.489 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04898834228515625 s) (per-host) I0424 21:37:05.723151 137352869230400 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.049065s (batch_requests_ready=0.001901s, total_serialization_initiated=0.047079s, others=0.000085s) I0424 21:37:05.723243 137352869230400 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.053981s (all_items=0.000012s, per_item={'items': '0.00001216'}, temp_paths=0.053969) I0424 21:37:05.723956 137352869230400 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.62 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/15. I0424 21:37:05.724271 137228206458624 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-24 21:57:05.724236 I0424 21:37:05.726308 137352869230400 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize I0424 21:37:05.726570 137225538889472 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0424 21:37:05.726726 137352869230400 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777066577.263622, 'wait_for_prev_duration_secs': 47.83627390861511, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777066625.1019292, 'checkpointer_blocking_duration_secs': 0.6224877834320068, 'get_old_steps_start_time': 1777066625.7244394, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1777066577.2611642, 'checkpoint_manager_blocking_duration_secs': 48.46552872657776} I0424 21:37:05.726840 137352869230400 checkpointing.py:408] Started an asynchronous checkpoint save for step 15 I0424 21:37:05.727590 137352869230400 metric_logger.py:196] completed step: 14, seconds: 0.148, TFLOP/s/device: 92.066, Tokens/s/device: 13877.219, total_weights: 65536, loss: 5.864, lm_loss: 5.864, perplexity: 352.193 I0424 21:37:05.733549 137352869230400 metric_logger.py:196] completed step: 15, seconds: 0.147, TFLOP/s/device: 92.202, Tokens/s/device: 13897.748, total_weights: 65536, loss: 5.719, lm_loss: 5.719, perplexity: 304.661 I0424 21:37:10.765776 137224430802688 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/15/items/array_metadatas/process_6 I0424 21:37:26.670938 137352869230400 metric_logger.py:196] completed step: 16, seconds: 48.761, TFLOP/s/device: 0.279, Tokens/s/device: 42.000, total_weights: 65536, loss: 5.605, lm_loss: 5.605, perplexity: 271.872 I0424 21:37:26.818313 137352869230400 metric_logger.py:196] completed step: 17, seconds: 20.791, TFLOP/s/device: 0.654, Tokens/s/device: 98.503, total_weights: 65536, loss: 5.517, lm_loss: 5.517, perplexity: 248.975 I0424 21:37:26.965670 137352869230400 metric_logger.py:196] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.253, Tokens/s/device: 13453.239, total_weights: 65536, loss: 5.448, lm_loss: 5.448, perplexity: 232.333 I0424 21:37:27.112199 137352869230400 checkpointing.py:772] Waiting for step 19 to finish before checkpoint... I0424 21:37:27.112881 137352869230400 checkpointing.py:776] Waited 0.0007002353668212891 seconds for step 19 to finish before starting checkpointing. I0424 21:37:27.114953 137352869230400 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 21:37:46.781296 137228206458624 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 38.426 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.10716152191162 s) (per-host) I0424 21:37:46.781436 137228206458624 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.057053s. I0424 21:37:54.891448 137228206458624 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 49.167044s. I0424 21:37:54.891750 137225538889472 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 21:37:54.891874 137225538889472 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0424 21:37:54.891924 137225538889472 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts... I0424 21:37:54.893186 137225538889472 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts. I0424 21:37:54.893368 137352869230400 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15. W0424 21:37:54.893496 137352869230400 checkpoint_manager.py:1452] Waiting for previous save to complete took 27.778549 seconds. If this number is high, consider checkpointing less frequently. I0424 21:37:54.894986 137352869230400 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 19 I0424 21:37:54.897142 137352869230400 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/19. I0424 21:37:55.605919 137352869230400 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0424 21:37:55.606011 137352869230400 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 21:37:55.646803 137352869230400 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.041653s I0424 21:37:55.646966 137352869230400 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 34.079 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.045264482498168945 s) (per-host) I0424 21:37:55.647012 137352869230400 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045321s (batch_requests_ready=0.001790s, total_serialization_initiated=0.043470s, others=0.000061s) I0424 21:37:55.647115 137352869230400 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.049461s (all_items=0.000011s, per_item={'items': '0.00001121'}, temp_paths=0.049449) I0424 21:37:55.647794 137352869230400 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.75 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/19. I0424 21:37:55.648081 137225538889472 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-24 21:57:55.648049 I0424 21:37:55.650015 137352869230400 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize I0424 21:37:55.650290 137224430802688 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0424 21:37:55.650447 137352869230400 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777066647.1149244, 'wait_for_prev_duration_secs': 27.77854895591736, 'time_between_consecutive_saves_sec': 22.015264749526978, 'checkpointer_blocking_start_time': 1777066674.895025, 'checkpointer_blocking_duration_secs': 0.753211498260498, 'get_old_steps_start_time': 1777066675.6482546, 'get_old_steps_duration_secs': 2.5272369384765625e-05, 'checkpoint_manager_blocking_start_time': 1777066647.1131287, 'checkpoint_manager_blocking_duration_secs': 28.537287712097168} I0424 21:37:55.650558 137352869230400 checkpointing.py:408] Started an asynchronous checkpoint save for step 19 I0424 21:37:55.650600 137352869230400 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 21:38:00.717180 137224447588096 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260424_200834/linen_xpk_test_pipeline_scan_nnx_20260424_200834_16_zarr3_false/checkpoints/19/items/array_metadatas/process_6 I0424 21:38:36.953488 137225538889472 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 38.199 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.351768255233765 s) (per-host) I0424 21:38:36.953599 137225538889472 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.305391s. I0424 21:38:44.200716 137225538889472 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 48.552493s. I0424 21:38:44.200996 137224430802688 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 21:38:44.201132 137224430802688 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0424 21:38:44.201175 137224430802688 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts... I0424 21:38:44.202776 137224430802688 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts. I0424 21:38:44.202949 137352869230400 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19. I0424 21:38:44.203112 137352869230400 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0424 21:38:44.204071 137352869230400 metric_logger.py:196] completed step: 19, seconds: 0.148, TFLOP/s/device: 92.046, Tokens/s/device: 13874.117, total_weights: 65536, loss: 5.391, lm_loss: 5.391, perplexity: 219.349 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Fri Apr 24 21:38:59 UTC 2026 EXIT_CODE=0