XPK Start: Thu Apr 23 15:33:09 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. 2026-04-23 15:33:34.072230: 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 15:33:34.282078 138021629388608 max_utils.py:273] Attempting to initialize the jax distributed system... I0423 15:33:43.323216 138021629388608 distributed.py:149] Starting JAX distributed service on [::]:8482 I0423 15:33:43.325618 138021629388608 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-true-sv-17a68-slice-job-0-0.mt-16-zarr3-true-sv-17a68:8482 I0423 15:33:44.259460 138021629388608 max_utils.py:284] Jax distributed system initialized! I0423 15:33:50.256237 138021629388608 max_utils.py:800] System Information: Jax Version: 0.9.2 I0423 15:33:50.256344 138021629388608 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0423 15:33:50.256385 138021629388608 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 I0423 15:33:50.256419 138021629388608 train_utils.py:391] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0423 15:33:50.953416 138021629388608 maxtext_utils.py:1771] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0423 15:33:51.067637 138021629388608 checkpointing.py:688] Setting up checkpoint logger... I0423 15:33:51.067767 138021629388608 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0423 15:33:51.067813 138021629388608 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0423 15:33:51.068161 138021629388608 base_pytree_checkpoint_handler.py:441] 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 0x7d87163142c0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0423 15:33:54.094711 138021629388608 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0423 15:33:54.094948 138021629388608 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 0x7d72a42a13a0>}, handler_registry=None I0423 15:33:54.095196 138021629388608 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d72a42a13a0>` 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 15:33:54.095250 138021629388608 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d71b47b1bb0>` 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 15:33:54.095286 138021629388608 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 0x7d72a42a13a0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d72a42a13a0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d71b47b1bb0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d71b47b1bb0>}). I0423 15:33:54.095621 138021629388608 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0423 15:33:54.095689 138021629388608 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d71b4717560> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0423 15:33:55.127130 138021629388608 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints I0423 15:33:55.167392 138021629388608 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/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d71b47b1610> I0423 15:33:55.167545 138021629388608 checkpointing.py:302] Checkpoint manager created! I0423 15:33:56.152247 138021629388608 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0423 15:33:56.152368 138021629388608 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0423 15:33:57.534652 138021629388608 maxtext_utils.py:1889] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0423 15:33:57.534772 138021629388608 maxtext_utils.py:1889] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0423 15:33:57.534826 138021629388608 maxtext_utils.py:1889] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0423 15:33:57.534870 138021629388608 maxtext_utils.py:1889] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0423 15:33:57.534907 138021629388608 maxtext_utils.py:1889] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0423 15:33:57.534941 138021629388608 maxtext_utils.py:1889] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0423 15:33:57.534976 138021629388608 maxtext_utils.py:1889] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0423 15:33:57.535011 138021629388608 maxtext_utils.py:1889] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0423 15:33:57.535045 138021629388608 maxtext_utils.py:1889] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0423 15:33:57.535078 138021629388608 maxtext_utils.py:1889] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0423 15:33:57.535126 138021629388608 maxtext_utils.py:1889] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0423 15:33:57.535160 138021629388608 maxtext_utils.py:1889] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0423 15:33:57.933447 138021629388608 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0423 15:33:57.933545 138021629388608 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 15:33:57.938762 138021629388608 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0423 15:33:57.938819 138021629388608 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 15:33:57.955299 138021629388608 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 15:33:57.955356 138021629388608 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 15:33:57.971202 138021629388608 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 15:33:57.971259 138021629388608 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 15:33:57.996417 138021629388608 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 15:33:57.996488 138021629388608 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 15:33:58.012824 138021629388608 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 15:33:58.012885 138021629388608 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 15:33:58.028766 138021629388608 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 15:33:58.028826 138021629388608 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 15:33:58.058314 138021629388608 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0423 15:33:58.058382 138021629388608 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 15:33:58.078574 138021629388608 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0423 15:33:58.078636 138021629388608 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0423 15:34:09.582020 138021629388608 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 15:34:09.584294 138021629388608 metric_logger.py:301] number parameters: 1.104 billion I0423 15:34:20.781058 138021629388608 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0423 15:34:20.936789 138021629388608 checkpointing.py:798] Waited 0.1557159423828125 seconds for step 0 to finish before starting checkpointing. I0423 15:34:20.939115 138021629388608 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 15:34:20.940781 138021629388608 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0 I0423 15:34:20.942185 138021629388608 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/0. I0423 15:34:21.245759 138021629388608 signaling_client.py:364] Using JaxDistributedSignalingClient I0423 15:34:21.246848 138021629388608 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0423 15:34:21.246924 138021629388608 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 15:34:21.526908 138021629388608 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.282066s I0423 15:34:21.527076 138021629388608 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.294 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2913811206817627 s) (per-host) I0423 15:34:21.527140 138021629388608 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.291456s (batch_requests_ready=0.003109s, total_serialization_initiated=0.288264s, others=0.000082s) I0423 15:34:21.527237 138021629388608 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.295592s (all_items=0.000022s, per_item={'items': '0.00002170'}, temp_paths=0.295570) I0423 15:34:21.527977 138021629388608 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.59 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/0. I0423 15:34:21.528329 137893115705088 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 15:54:21.528284 I0423 15:34:21.530276 138021629388608 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0423 15:34:21.530558 137890948380416 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0423 15:34:21.530687 138021629388608 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776958460.9390786, 'wait_for_prev_duration_secs': 7.796287536621094e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776958460.9408195, 'checkpointer_blocking_duration_secs': 0.587672233581543, 'get_old_steps_start_time': 1776958461.5285177, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776958460.937198, 'checkpoint_manager_blocking_duration_secs': 0.5934522151947021} I0423 15:34:21.530838 138021629388608 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0423 15:34:21.530909 138021629388608 max_utils.py:750] Memstats: After params initialized: I0423 15:34:21.530956 138021629388608 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0423 15:34:21.530990 138021629388608 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0423 15:34:21.531013 138021629388608 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0423 15:34:21.531037 138021629388608 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0423 15:34:21.843251 138021629388608 metric_logger.py:196] completed step: 0, seconds: 11.196, TFLOP/s/device: 1.214, Tokens/s/device: 182.927, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0423 15:34:22.026752 138021629388608 metric_logger.py:196] completed step: 1, seconds: 1.060, TFLOP/s/device: 12.813, Tokens/s/device: 1931.369, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52786.469 I0423 15:34:22.469753 138021629388608 metric_logger.py:196] completed step: 2, seconds: 0.037, TFLOP/s/device: 364.833, Tokens/s/device: 54991.676, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38565.637 I0423 15:34:22.617727 138021629388608 metric_logger.py:196] completed step: 3, seconds: 0.433, TFLOP/s/device: 31.395, Tokens/s/device: 4732.186, total_weights: 65536, loss: 9.979, lm_loss: 9.979, perplexity: 21564.932 I0423 15:34:22.623335 138021629388608 checkpointing.py:794] Waiting for step 5 to finish before checkpoint... I0423 15:34:22.912947 138021629388608 checkpointing.py:798] Waited 0.2895827293395996 seconds for step 5 to finish before starting checkpointing. I0423 15:34:22.916387 138021629388608 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 15:34:24.749859 2818 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0423 15:34:26.784460 137890965165824 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/0/items/array_metadatas/process_6 I0423 15:34:58.446462 137893115705088 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 42.450 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.210710525512695 s) (per-host) I0423 15:34:58.446582 137893115705088 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.918138s. I0423 15:35:07.191484 137893115705088 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 45.663023s. I0423 15:35:07.191742 137890948380416 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 15:35:07.191860 137890948380416 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0423 15:35:07.191910 137890948380416 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0423 15:35:07.194296 137890948380416 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0423 15:35:07.194497 138021629388608 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0423 15:35:07.194643 138021629388608 checkpoint_manager.py:1452] Waiting for previous save to complete took 44.278255 seconds. If this number is high, consider checkpointing less frequently. I0423 15:35:07.196724 138021629388608 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 5 I0423 15:35:07.199213 138021629388608 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/5. I0423 15:35:07.514106 138021629388608 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0423 15:35:07.514201 138021629388608 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 15:35:07.555771 138021629388608 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043182s I0423 15:35:07.555940 138021629388608 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 30.830 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.05003523826599121 s) (per-host) I0423 15:35:07.555991 138021629388608 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.050097s (batch_requests_ready=0.002568s, total_serialization_initiated=0.047459s, others=0.000069s) I0423 15:35:07.556085 138021629388608 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.054904s (all_items=0.000016s, per_item={'items': '0.00001597'}, temp_paths=0.054888) I0423 15:35:07.556763 138021629388608 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.36 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/5. I0423 15:35:07.557129 137868181763840 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 15:55:07.557079 I0423 15:35:07.569801 138021629388608 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0423 15:35:07.570122 137890948380416 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0423 15:35:07.570290 138021629388608 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776958462.9163575, 'wait_for_prev_duration_secs': 44.278254985809326, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776958507.1967654, 'checkpointer_blocking_duration_secs': 0.36051344871520996, 'get_old_steps_start_time': 1776958507.5573018, 'get_old_steps_duration_secs': 2.8848648071289062e-05, 'checkpoint_manager_blocking_start_time': 1776958462.9133143, 'checkpoint_manager_blocking_duration_secs': 44.656935930252075} I0423 15:35:07.570399 138021629388608 checkpointing.py:409] Started an asynchronous checkpoint save for step 5 I0423 15:35:07.571470 138021629388608 metric_logger.py:196] completed step: 4, seconds: 0.164, TFLOP/s/device: 82.743, Tokens/s/device: 12471.987, total_weights: 65536, loss: 9.457, lm_loss: 9.457, perplexity: 12802.436 I0423 15:35:07.579115 138021629388608 metric_logger.py:196] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.051, Tokens/s/device: 13874.963, total_weights: 65536, loss: 8.955, lm_loss: 8.955, perplexity: 7748.778 I0423 15:35:13.290273 137890965165824 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/5/items/array_metadatas/process_6 I0423 15:35:31.051694 138021629388608 metric_logger.py:196] completed step: 6, seconds: 44.954, TFLOP/s/device: 0.302, Tokens/s/device: 45.558, total_weights: 65536, loss: 8.465, lm_loss: 8.465, perplexity: 4743.984 I0423 15:35:31.199189 138021629388608 metric_logger.py:196] completed step: 7, seconds: 23.327, TFLOP/s/device: 0.582, Tokens/s/device: 87.794, total_weights: 65536, loss: 7.998, lm_loss: 7.998, perplexity: 2976.266 I0423 15:35:31.346659 138021629388608 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.766, Tokens/s/device: 13379.849, total_weights: 65536, loss: 7.567, lm_loss: 7.567, perplexity: 1933.479 I0423 15:35:31.494815 138021629388608 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0423 15:35:31.495497 138021629388608 checkpointing.py:798] Waited 0.0006940364837646484 seconds for step 9 to finish before starting checkpointing. I0423 15:35:31.498691 138021629388608 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 15:35:50.278874 137868181763840 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.930 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.772940158843994 s) (per-host) I0423 15:35:50.278986 137868181763840 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.721739s. I0423 15:35:59.854590 137868181763840 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 52.297328s. I0423 15:35:59.854883 137890948380416 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 15:35:59.855010 137890948380416 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0423 15:35:59.855057 137890948380416 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0423 15:35:59.857407 137890948380416 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0423 15:35:59.857581 138021629388608 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5. W0423 15:35:59.857703 138021629388608 checkpoint_manager.py:1452] Waiting for previous save to complete took 28.359018 seconds. If this number is high, consider checkpointing less frequently. I0423 15:35:59.859117 138021629388608 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 9 I0423 15:35:59.861465 138021629388608 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/9. I0423 15:36:00.172844 138021629388608 jax_array_handlers.py:360] Scheduling D2H of 69 prioritized jax.Array. I0423 15:36:00.172941 138021629388608 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 15:36:00.212242 138021629388608 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.041030s I0423 15:36:00.212408 138021629388608 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 32.242 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04784369468688965 s) (per-host) I0423 15:36:00.212460 138021629388608 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.047906s (batch_requests_ready=0.002687s, total_serialization_initiated=0.045152s, others=0.000067s) I0423 15:36:00.212553 138021629388608 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.052022s (all_items=0.000010s, per_item={'items': '0.00001049'}, temp_paths=0.052012) I0423 15:36:00.213232 138021629388608 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.35 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/9. I0423 15:36:00.213537 137890948380416 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 15:56:00.213496 I0423 15:36:00.230992 138021629388608 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0423 15:36:00.231297 137890965165824 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0423 15:36:00.231454 138021629388608 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776958531.49866, 'wait_for_prev_duration_secs': 28.359017610549927, 'time_between_consecutive_saves_sec': 24.304316520690918, 'checkpointer_blocking_start_time': 1776958559.859156, 'checkpointer_blocking_duration_secs': 0.35453033447265625, 'get_old_steps_start_time': 1776958560.2137032, 'get_old_steps_duration_secs': 2.47955322265625e-05, 'checkpoint_manager_blocking_start_time': 1776958531.4957278, 'checkpoint_manager_blocking_duration_secs': 28.735694646835327} I0423 15:36:00.231566 138021629388608 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0423 15:36:00.231610 138021629388608 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 15:36:05.376148 137891535648512 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/nnx_xpk_feat_nnx_post_train_fixes_20260423_124541_16_zarr3_true/checkpoints/9/items/array_metadatas/process_6 I0423 15:36:41.589958 137890948380416 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 38.131 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.425355672836304 s) (per-host) I0423 15:36:41.590081 137890948380416 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.376430s. I0423 15:36:50.909323 137890948380416 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 50.695655s. I0423 15:36:50.909648 137890965165824 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 15:36:50.909773 137890965165824 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0423 15:36:50.909820 137890965165824 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0423 15:36:50.911217 137890965165824 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0423 15:36:50.911408 138021629388608 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0423 15:36:50.911599 138021629388608 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 15:36:50.912596 138021629388608 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.132, Tokens/s/device: 13887.194, total_weights: 65536, loss: 7.176, lm_loss: 7.176, perplexity: 1307.366 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Thu Apr 23 15:36:59 UTC 2026 EXIT_CODE=0