XPK Start: Fri Apr 17 04:10:43 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-17 04:11:07.885519: 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) I0417 04:11:08.063299 138967777109824 max_utils.py:273] Attempting to initialize the jax distributed system... I0417 04:11:17.104900 138967777109824 distributed.py:149] Starting JAX distributed service on [::]:8482 I0417 04:11:17.107190 138967777109824 distributed.py:172] Connecting to JAX distributed service on mt-15-ocdbt-false-sv-edpmg-slice-job-0-0.mt-15-ocdbt-false-sv-edpmg:8482 I0417 04:11:18.249209 138967777109824 max_utils.py:284] Jax distributed system initialized! I0417 04:11:24.481379 138967777109824 max_utils.py:800] System Information: Jax Version: 0.9.2 I0417 04:11:24.481482 138967777109824 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0417 04:11:24.481521 138967777109824 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 I0417 04:11:24.481555 138967777109824 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0417 04:11:25.162989 138967777109824 maxtext_utils.py:1687] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0417 04:11:25.163564 138967777109824 maxtext_utils.py:1687] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0417 04:11:25.163748 138967777109824 checkpointing.py:688] Setting up checkpoint logger... I0417 04:11:25.163797 138967777109824 checkpointing.py:234] Creating checkpoint manager with ocdbt=False and zarr3=True I0417 04:11:25.163851 138967777109824 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0417 04:11:25.164179 138967777109824 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=False, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7e633d534140>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0417 04:11:28.551488 138967777109824 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0417 04:11:28.551728 138967777109824 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 0x7e4f7c2e3bf0>}, handler_registry=None I0417 04:11:28.551979 138967777109824 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e4f7c2e3bf0>` 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`. I0417 04:11:28.552028 138967777109824 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e4f7c2e7da0>` 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`. I0417 04:11:28.552065 138967777109824 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 0x7e4f7c2e3bf0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e4f7c2e3bf0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e4f7c2e7da0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e4f7c2e7da0>}). I0417 04:11:28.552386 138967777109824 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0417 04:11:28.552456 138967777109824 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e4f647cc7c0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0417 04:11:31.284612 138967777109824 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints I0417 04:11:31.738005 138967777109824 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_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e4f7c44a3f0> I0417 04:11:31.738177 138967777109824 checkpointing.py:302] Checkpoint manager created! I0417 04:11:32.666146 138967777109824 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0417 04:11:32.666253 138967777109824 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 04:11:33.047747 138967777109824 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 04:11:33.047846 138967777109824 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 04:11:33.064203 138967777109824 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 04:11:33.064261 138967777109824 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 04:11:33.087953 138967777109824 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 04:11:33.088021 138967777109824 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 04:11:33.104372 138967777109824 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 04:11:33.104429 138967777109824 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 04:11:33.120736 138967777109824 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 04:11:33.120793 138967777109824 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 04:11:33.145416 138967777109824 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0417 04:11:33.145487 138967777109824 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 04:11:33.166934 138967777109824 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0417 04:11:33.166996 138967777109824 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0417 04:11:33.379423 138967777109824 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0417 04:11:33.379528 138967777109824 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0417 04:11:34.799221 138967777109824 maxtext_utils.py:1796] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0417 04:11:34.799347 138967777109824 maxtext_utils.py:1796] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0417 04:11:34.799399 138967777109824 maxtext_utils.py:1796] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0417 04:11:34.799457 138967777109824 maxtext_utils.py:1796] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0417 04:11:34.799509 138967777109824 maxtext_utils.py:1796] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0417 04:11:34.799547 138967777109824 maxtext_utils.py:1796] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0417 04:11:34.799601 138967777109824 maxtext_utils.py:1796] 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) I0417 04:11:34.799651 138967777109824 maxtext_utils.py:1796] 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') I0417 04:11:34.799692 138967777109824 maxtext_utils.py:1796] 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) I0417 04:11:34.799728 138967777109824 maxtext_utils.py:1796] 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) I0417 04:11:34.799776 138967777109824 maxtext_utils.py:1796] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0417 04:11:34.799841 138967777109824 maxtext_utils.py:1796] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0417 04:11:35.290681 138967777109824 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0417 04:11:35.290772 138967777109824 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0417 04:11:35.306513 138967777109824 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0417 04:11:35.306579 138967777109824 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0417 04:11:46.468322 138967777109824 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. I0417 04:11:46.469192 138967777109824 metric_logger.py:289] number parameters: 1.104 billion I0417 04:11:57.791619 138967777109824 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0417 04:11:57.944831 138967777109824 checkpointing.py:798] Waited 0.15317010879516602 seconds for step 0 to finish before starting checkpointing. I0417 04:11:57.947464 138967777109824 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 04:11:57.949076 138967777109824 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0 I0417 04:11:57.950525 138967777109824 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/0. I0417 04:11:58.696605 138967777109824 signaling_client.py:364] Using JaxDistributedSignalingClient I0417 04:11:58.697613 138967777109824 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0417 04:11:58.697669 138967777109824 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 I0417 04:11:58.975924 138967777109824 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.279391s I0417 04:11:58.976098 138967777109824 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.418 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2847330570220947 s) (per-host) I0417 04:11:58.976153 138967777109824 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.284797s (batch_requests_ready=0.002164s, total_serialization_initiated=0.282561s, others=0.000072s) I0417 04:11:58.976248 138967777109824 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.289013s (all_items=0.000019s, per_item={'items': '0.00001884'}, temp_paths=0.288994) I0417 04:11:58.977039 138967777109824 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.03 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/0. I0417 04:11:58.977365 138840497649408 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 04:31:58.977329 I0417 04:11:58.983627 138967777109824 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0417 04:11:58.983911 138837782853376 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0417 04:11:58.984058 138967777109824 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776399117.9474452, 'wait_for_prev_duration_secs': 6.103515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776399117.949116, 'checkpointer_blocking_duration_secs': 1.028404712677002, 'get_old_steps_start_time': 1776399118.9775457, 'get_old_steps_duration_secs': 2.9087066650390625e-05, 'checkpoint_manager_blocking_start_time': 1776399117.9453363, 'checkpoint_manager_blocking_duration_secs': 1.038680076599121} I0417 04:11:58.984227 138967777109824 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0417 04:11:58.984279 138967777109824 max_utils.py:750] Memstats: After params initialized: I0417 04:11:58.984327 138967777109824 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0)) I0417 04:11:58.984359 138967777109824 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0)) I0417 04:11:58.984387 138967777109824 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0)) I0417 04:11:58.984412 138967777109824 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0)) I0417 04:11:59.296235 138967777109824 metric_logger.py:185] completed step: 0, seconds: 11.322, TFLOP/s/device: 1.200, Tokens/s/device: 180.882, total_weights: 65536, loss: 10.874 I0417 04:11:59.481142 138967777109824 metric_logger.py:185] completed step: 1, seconds: 1.503, TFLOP/s/device: 9.038, Tokens/s/device: 1362.269, total_weights: 65536, loss: 10.874 I0417 04:11:59.891276 138967777109824 metric_logger.py:185] completed step: 2, seconds: 0.038, TFLOP/s/device: 360.077, Tokens/s/device: 54274.659, total_weights: 65536, loss: 10.560 I0417 04:12:00.038671 138967777109824 metric_logger.py:185] completed step: 3, seconds: 0.410, TFLOP/s/device: 33.108, Tokens/s/device: 4990.399, total_weights: 65536, loss: 9.980 I0417 04:12:00.043261 138967777109824 checkpointing.py:794] Waiting for step 5 to finish before checkpoint... I0417 04:12:00.332992 138967777109824 checkpointing.py:798] Waited 0.28969883918762207 seconds for step 5 to finish before starting checkpointing. I0417 04:12:00.335933 138967777109824 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 04:12:02.792108 2807 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0417 04:12:05.732255 138837791246080 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_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/0/items/array_metadatas/process_6 I0417 04:12:10.218732 138840497649408 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 137.031 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.527328491210938 s) (per-host) I0417 04:12:10.218864 138840497649408 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 11.241386s. I0417 04:12:17.227772 138840497649408 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 18.250278s. I0417 04:12:17.228076 138837782853376 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 04:12:17.228210 138837782853376 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0417 04:12:17.228260 138837782853376 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0417 04:12:17.230314 138837782853376 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0417 04:12:17.230543 138967777109824 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. W0417 04:12:17.230678 138967777109824 checkpoint_manager.py:1452] Waiting for previous save to complete took 16.894744 seconds. If this number is high, consider checkpointing less frequently. I0417 04:12:17.232525 138967777109824 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 5 I0417 04:12:17.234951 138967777109824 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/5. I0417 04:12:17.520714 138967777109824 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0417 04:12:17.520805 138967777109824 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 I0417 04:12:17.554634 138967777109824 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.035161s I0417 04:12:17.554789 138967777109824 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 40.056 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03851056098937988 s) (per-host) I0417 04:12:17.554853 138967777109824 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038582s (batch_requests_ready=0.001745s, total_serialization_initiated=0.036758s, others=0.000079s) I0417 04:12:17.554941 138967777109824 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.043509s (all_items=0.000015s, per_item={'items': '0.00001454'}, temp_paths=0.043495) I0417 04:12:17.555629 138967777109824 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.32 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/5. I0417 04:12:17.555915 138837782853376 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 04:32:17.555890 I0417 04:12:17.565148 138967777109824 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0417 04:12:17.565400 138839985223424 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0417 04:12:17.565559 138967777109824 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776399120.3359032, 'wait_for_prev_duration_secs': 16.894744157791138, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776399137.232564, 'checkpointer_blocking_duration_secs': 0.3234539031982422, 'get_old_steps_start_time': 1776399137.5560412, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776399120.333596, 'checkpoint_manager_blocking_duration_secs': 17.23192834854126} I0417 04:12:17.565678 138967777109824 checkpointing.py:409] Started an asynchronous checkpoint save for step 5 I0417 04:12:17.566256 138967777109824 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.932, Tokens/s/device: 13404.808, total_weights: 65536, loss: 9.460 I0417 04:12:17.571866 138967777109824 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.270, Tokens/s/device: 13907.941, total_weights: 65536, loss: 8.959 I0417 04:12:23.411878 138837791246080 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_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/5/items/array_metadatas/process_6 I0417 04:12:29.047161 138837782853376 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 136.989 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.530832290649414 s) (per-host) I0417 04:12:29.047278 138837782853376 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 11.491283s. I0417 04:12:36.174468 138837782853376 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 18.618457s. I0417 04:12:36.174769 138839985223424 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 04:12:36.174942 138839985223424 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0417 04:12:36.174997 138839985223424 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0417 04:12:36.177684 138839985223424 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0417 04:12:39.947576 138967777109824 metric_logger.py:185] completed step: 6, seconds: 17.527, TFLOP/s/device: 0.775, Tokens/s/device: 116.846, total_weights: 65536, loss: 8.469 I0417 04:12:40.094947 138967777109824 metric_logger.py:185] completed step: 7, seconds: 22.230, TFLOP/s/device: 0.611, Tokens/s/device: 92.129, total_weights: 65536, loss: 8.003 I0417 04:12:40.242676 138967777109824 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.476, Tokens/s/device: 13486.727, total_weights: 65536, loss: 7.572 I0417 04:12:40.389899 138967777109824 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0417 04:12:40.390558 138967777109824 checkpointing.py:798] Waited 0.0006887912750244141 seconds for step 9 to finish before starting checkpointing. I0417 04:12:40.392505 138967777109824 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 04:12:40.394176 138967777109824 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 9 I0417 04:12:40.395563 138967777109824 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/9. I0417 04:12:41.102972 138967777109824 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0417 04:12:41.103063 138967777109824 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 I0417 04:12:41.137221 138967777109824 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.035311s I0417 04:12:41.137388 138967777109824 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 39.845 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03871417045593262 s) (per-host) I0417 04:12:41.137437 138967777109824 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038774s (batch_requests_ready=0.001631s, total_serialization_initiated=0.037078s, others=0.000065s) I0417 04:12:41.137525 138967777109824 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.043044s (all_items=0.000011s, per_item={'items': '0.00001144'}, temp_paths=0.043032) I0417 04:12:41.138180 138967777109824 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.74 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/9. I0417 04:12:41.138509 138839985223424 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 04:32:41.138473 I0417 04:12:41.146571 138967777109824 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0417 04:12:41.146880 138838330504960 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save. I0417 04:12:41.147040 138967777109824 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776399160.3924744, 'wait_for_prev_duration_secs': 7.176399230957031e-05, 'time_between_consecutive_saves_sec': 4.21474814414978, 'checkpointer_blocking_start_time': 1776399160.3942149, 'checkpointer_blocking_duration_secs': 0.744434118270874, 'get_old_steps_start_time': 1776399161.1386664, 'get_old_steps_duration_secs': 2.47955322265625e-05, 'checkpoint_manager_blocking_start_time': 1776399160.3907788, 'checkpoint_manager_blocking_duration_secs': 0.7562272548675537} I0417 04:12:41.147153 138967777109824 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0417 04:12:41.147200 138967777109824 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 04:12:46.612717 138837791246080 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_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_15_ocdbt_false/checkpoints/9/items/array_metadatas/process_6 I0417 04:12:52.244771 138839985223424 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 141.718 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.146058797836304 s) (per-host) I0417 04:12:52.244910 138839985223424 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 11.106290s. I0417 04:13:00.869072 138839985223424 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 19.730436s. I0417 04:13:00.869366 138838330504960 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 04:13:00.869481 138838330504960 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save. I0417 04:13:00.869524 138838330504960 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0417 04:13:00.871179 138838330504960 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0417 04:13:00.871367 138967777109824 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. I0417 04:13:00.871520 138967777109824 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 04:13:00.872255 138967777109824 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.169, Tokens/s/device: 13892.752, 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: Fri Apr 17 04:13:09 UTC 2026 EXIT_CODE=0