XPK Start: Fri Apr 17 02:37:42 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 02:38:06.491270: 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 02:38:06.669523 133052069353280 max_utils.py:273] Attempting to initialize the jax distributed system... I0417 02:38:15.709810 133052069353280 distributed.py:149] Starting JAX distributed service on [::]:8482 I0417 02:38:15.712147 133052069353280 distributed.py:172] Connecting to JAX distributed service on mt-01-base-nulk9-slice-job-0-0.mt-01-base-nulk9:8482 I0417 02:38:17.354006 133052069353280 max_utils.py:284] Jax distributed system initialized! I0417 02:38:23.417498 133052069353280 max_utils.py:800] System Information: Jax Version: 0.9.2 I0417 02:38:23.417599 133052069353280 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0417 02:38:23.417640 133052069353280 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 02:38:23.417676 133052069353280 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0417 02:38:24.454374 133052069353280 maxtext_utils.py:1687] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0417 02:38:24.454995 133052069353280 maxtext_utils.py:1687] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0417 02:38:24.455185 133052069353280 checkpointing.py:688] Setting up checkpoint logger... I0417 02:38:24.455237 133052069353280 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0417 02:38:24.455282 133052069353280 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0417 02:38:24.455628 133052069353280 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 0x79020cf1cbf0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0417 02:38:27.992571 133052069353280 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0417 02:38:27.992808 133052069353280 checkpoint_manager.py:708] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7900d5d76c00>}, handler_registry=None I0417 02:38:27.993069 133052069353280 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7900d5d76c00>` 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 02:38:27.993122 133052069353280 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7900d5d66e40>` 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 02:38:27.993157 133052069353280 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 0x7900d5d76c00>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7900d5d76c00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7900d5d66e40>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7900d5d66e40>}). I0417 02:38:27.993477 133052069353280 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0417 02:38:27.993549 133052069353280 async_checkpointer.py:192] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7900d5d6cae0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0417 02:38:30.459330 133052069353280 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_01_base/checkpoints I0417 02:38:30.491004 133052069353280 checkpoint_manager.py:929] [process=0][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=10), 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_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7900d5d75a00> I0417 02:38:30.491142 133052069353280 checkpointing.py:302] Checkpoint manager created! I0417 02:38:31.411376 133052069353280 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0417 02:38:31.411482 133052069353280 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 02:38:31.792259 133052069353280 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 02:38:31.792347 133052069353280 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 02:38:31.808605 133052069353280 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 02:38:31.808661 133052069353280 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 02:38:31.832156 133052069353280 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 02:38:31.832221 133052069353280 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 02:38:31.848527 133052069353280 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 02:38:31.848593 133052069353280 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 02:38:31.864892 133052069353280 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 02:38:31.864948 133052069353280 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 02:38:31.890194 133052069353280 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0417 02:38:31.890263 133052069353280 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 02:38:31.910864 133052069353280 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0417 02:38:31.910927 133052069353280 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0417 02:38:32.123324 133052069353280 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0417 02:38:32.123433 133052069353280 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0417 02:38:33.542709 133052069353280 maxtext_utils.py:1796] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0417 02:38:33.542833 133052069353280 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 02:38:33.542902 133052069353280 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 02:38:33.542964 133052069353280 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 02:38:33.543018 133052069353280 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 02:38:33.543057 133052069353280 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 02:38:33.543114 133052069353280 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 02:38:33.543171 133052069353280 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 02:38:33.543213 133052069353280 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 02:38:33.543251 133052069353280 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 02:38:33.543298 133052069353280 maxtext_utils.py:1796] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0417 02:38:33.543345 133052069353280 maxtext_utils.py:1796] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0417 02:38:34.025031 133052069353280 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0417 02:38:34.025126 133052069353280 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0417 02:38:34.040536 133052069353280 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0417 02:38:34.040596 133052069353280 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0417 02:38:44.955748 133052069353280 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 02:38:44.963504 133052069353280 metric_logger.py:289] number parameters: 1.104 billion I0417 02:38:56.627666 133052069353280 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0417 02:38:56.780222 133052069353280 checkpointing.py:798] Waited 0.15253543853759766 seconds for step 0 to finish before starting checkpointing. I0417 02:38:56.782921 133052069353280 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 02:38:56.784658 133052069353280 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 0 I0417 02:38:56.786057 133052069353280 event_tracking.py:70] [process=0] [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_01_base/checkpoints/0. I0417 02:38:57.523011 133052069353280 signaling_client.py:364] Using JaxDistributedSignalingClient I0417 02:38:57.537231 133052069353280 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0417 02:38:57.537297 133052069353280 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 02:38:57.793804 132923256727296 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0 I0417 02:38:57.808743 133052069353280 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.272183s I0417 02:38:57.809617 133052069353280 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 5.540 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.27843403816223145 s) (per-host) I0417 02:38:57.809690 133052069353280 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.278528s (batch_requests_ready=0.002048s, total_serialization_initiated=0.275706s, others=0.000775s) I0417 02:38:57.809763 133052069353280 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.282468s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.282451) I0417 02:38:57.810584 133052069353280 event_tracking.py:125] [process=0] [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_01_base/checkpoints/0. I0417 02:38:57.810890 132923265120000 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 02:58:57.810856 I0417 02:38:57.831561 133052069353280 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0417 02:38:57.831899 132921117636352 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0417 02:38:57.832059 133052069353280 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_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776393536.7828956, 'wait_for_prev_duration_secs': 6.580352783203125e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776393536.784697, 'checkpointer_blocking_duration_secs': 1.0263469219207764, 'get_old_steps_start_time': 1776393537.8110723, 'get_old_steps_duration_secs': 3.170967102050781e-05, 'checkpoint_manager_blocking_start_time': 1776393536.7807202, 'checkpoint_manager_blocking_duration_secs': 1.0512988567352295} I0417 02:38:57.832162 133052069353280 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0417 02:38:57.832213 133052069353280 max_utils.py:750] Memstats: After params initialized: I0417 02:38:57.832263 133052069353280 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_0(process=0,(0,0,0,0)) I0417 02:38:57.832294 133052069353280 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_1(process=0,(1,0,0,0)) I0417 02:38:57.832320 133052069353280 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_4(process=0,(0,1,0,0)) I0417 02:38:57.832345 133052069353280 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_5(process=0,(1,1,0,0)) I0417 02:38:58.173625 133052069353280 metric_logger.py:185] completed step: 0, seconds: 11.366, TFLOP/s/device: 1.195, Tokens/s/device: 180.194, total_weights: 65536, loss: 10.874 I0417 02:38:58.176815 133052069353280 metric_logger.py:269] To see full metrics 'tensorboard --logdir=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/tensorboard/' I0417 02:38:58.593903 133052069353280 metric_logger.py:185] completed step: 1, seconds: 1.544, TFLOP/s/device: 8.798, Tokens/s/device: 1326.085, total_weights: 65536, loss: 10.874 I0417 02:38:58.739986 133052069353280 metric_logger.py:185] completed step: 2, seconds: 0.421, TFLOP/s/device: 32.276, Tokens/s/device: 4865.024, total_weights: 65536, loss: 10.262 I0417 02:38:58.887223 133052069353280 metric_logger.py:185] completed step: 3, seconds: 0.009, TFLOP/s/device: 1530.599, Tokens/s/device: 230708.573, total_weights: 65536, loss: 9.734 I0417 02:39:00.068257 132923239941888 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0/items I0417 02:39:00.678925 132921059579648 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776393539822056264, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776393539822056264, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0/_CHECKPOINT_METADATA I0417 02:39:01.629701 2859 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0417 02:39:03.676762 132922186888960 array_metadata_store.py:203] [process=0][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_01_base/checkpoints/0/items/array_metadatas/process_0 I0417 02:39:20.646878 133052069353280 metric_logger.py:185] completed step: 4, seconds: 0.147, TFLOP/s/device: 92.532, Tokens/s/device: 13947.438, total_weights: 65536, loss: 9.277 I0417 02:39:20.655924 133052069353280 metric_logger.py:185] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.039, Tokens/s/device: 13873.083, total_weights: 65536, loss: 8.892 I0417 02:39:20.801947 133052069353280 metric_logger.py:185] completed step: 6, seconds: 21.759, TFLOP/s/device: 0.624, Tokens/s/device: 94.123, total_weights: 65536, loss: 8.592 I0417 02:39:20.949130 133052069353280 metric_logger.py:185] completed step: 7, seconds: 0.007, TFLOP/s/device: 2063.659, Tokens/s/device: 311057.108, total_weights: 65536, loss: 8.384 I0417 02:39:21.096502 133052069353280 metric_logger.py:185] completed step: 8, seconds: 0.147, TFLOP/s/device: 92.419, Tokens/s/device: 13930.362, total_weights: 65536, loss: 8.255 I0417 02:39:21.243487 133052069353280 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0417 02:39:21.244200 133052069353280 checkpointing.py:798] Waited 0.0007331371307373047 seconds for step 9 to finish before starting checkpointing. I0417 02:39:21.246241 133052069353280 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 02:39:37.939470 132922178496256 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 36.310302s (commit=35.118887s, array_metadata_write=1.191415s) I0417 02:39:37.940533 132923265120000 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 39.090 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.40930986404419 s) (per-host) I0417 02:39:37.940666 132923265120000 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.129657s. I0417 02:39:39.114006 132923265120000 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776393539822056264, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0/_CHECKPOINT_METADATA I0417 02:39:39.861247 132921059579648 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776393539822056264, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0/_CHECKPOINT_METADATA I0417 02:39:40.239762 132923265120000 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000246s. I0417 02:39:40.476187 132923265120000 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0417 02:39:41.414711 132923265120000 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 2.177618s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0/items I0417 02:39:41.416398 132923265120000 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0/items I0417 02:39:42.698689 132923265120000 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0 I0417 02:39:44.093227 132923265120000 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0`. I0417 02:39:44.093933 132923265120000 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 47.31 seconds @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/0 I0417 02:39:44.095441 132923265120000 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 46.284430s. I0417 02:39:44.095631 132921117636352 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 02:39:44.095767 132921117636352 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0417 02:39:44.095866 132921117636352 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0417 02:39:44.098066 132921117636352 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0417 02:39:44.098211 133052069353280 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0417 02:39:44.098343 133052069353280 checkpoint_manager.py:1452] Waiting for previous save to complete took 22.852101 seconds. If this number is high, consider checkpointing less frequently. I0417 02:39:44.100271 133052069353280 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 9 I0417 02:39:44.102352 133052069353280 event_tracking.py:70] [process=0] [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_01_base/checkpoints/9. I0417 02:39:44.391176 133052069353280 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0417 02:39:44.391269 133052069353280 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 02:39:44.417418 133052069353280 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027000s I0417 02:39:44.418303 133052069353280 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 48.918 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03153371810913086 s) (per-host) I0417 02:39:44.418382 133052069353280 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.031633s (batch_requests_ready=0.001801s, total_serialization_initiated=0.029026s, others=0.000806s) I0417 02:39:44.418476 133052069353280 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.035842s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.035825) I0417 02:39:44.419200 133052069353280 event_tracking.py:125] [process=0] [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_01_base/checkpoints/9. I0417 02:39:44.419531 132921117636352 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 02:59:44.419494 I0417 02:39:44.427651 133052069353280 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0417 02:39:44.427933 132922677851904 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0417 02:39:44.428099 133052069353280 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_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776393561.2462075, 'wait_for_prev_duration_secs': 22.85210108757019, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776393584.100313, 'checkpointer_blocking_duration_secs': 0.31935882568359375, 'get_old_steps_start_time': 1776393584.419696, 'get_old_steps_duration_secs': 3.1948089599609375e-05, 'checkpoint_manager_blocking_start_time': 1776393561.2444322, 'checkpoint_manager_blocking_duration_secs': 23.183631420135498} I0417 02:39:44.428204 133052069353280 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0417 02:39:44.428250 133052069353280 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 02:39:44.622651 132923265120000 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/9 I0417 02:39:47.253646 132924326328064 atomicity.py:140] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/9/items I0417 02:39:50.122019 132923239941888 array_metadata_store.py:203] [process=0][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_01_base/checkpoints/9/items/array_metadatas/process_0 I0417 02:40:29.714590 132922686244608 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.358136s (commit=40.152798s, array_metadata_write=1.205338s) I0417 02:40:29.715730 132921117636352 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 34.847 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 45.32893371582031 s) (per-host) I0417 02:40:29.715875 132921117636352 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 45.296232s. I0417 02:40:31.857797 132921117636352 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0417 02:40:32.068885 132921117636352 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000229s. I0417 02:40:32.955198 132921117636352 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.928437s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/9/items I0417 02:40:32.956779 132921117636352 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/9/items I0417 02:40:33.929711 132921117636352 atomicity.py:666] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/9 I0417 02:40:35.821527 132921117636352 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/9`. I0417 02:40:35.822281 132921117636352 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 51.72 seconds @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260417_023710/linen_xpk_feat_nnx_post_train_fixes_20260417_023710_01_base/checkpoints/9 I0417 02:40:35.823703 132921117636352 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 51.404058s. I0417 02:40:35.823833 132922677851904 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 02:40:35.823904 132922677851904 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0417 02:40:35.823963 132922677851904 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0417 02:40:35.826738 132922677851904 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0417 02:40:35.826931 133052069353280 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0417 02:40:35.827084 133052069353280 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 02:40:35.827775 133052069353280 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.475, Tokens/s/device: 13938.895, total_weights: 65536, loss: 8.179 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Fri Apr 17 02:40:48 UTC 2026 EXIT_CODE=0