XPK Start: Tue Apr 21 12:51:14 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-21 12:51:38.407136: 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) I0421 12:51:38.588892 136269990262592 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 12:51:47.631157 136269990262592 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 12:51:47.633521 136269990262592 distributed.py:172] Connecting to JAX distributed service on mt-15-ocdbt-false-sv-cti1k-slice-job-0-0.mt-15-ocdbt-false-sv-cti1k:8482 I0421 12:51:48.645175 136269990262592 max_utils.py:284] Jax distributed system initialized! I0421 12:51:54.904298 136269990262592 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 12:51:54.904400 136269990262592 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 12:51:54.904438 136269990262592 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 I0421 12:51:54.904472 136269990262592 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 12:51:55.603109 136269990262592 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 12:51:55.603677 136269990262592 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 12:51:55.603863 136269990262592 checkpointing.py:688] Setting up checkpoint logger... I0421 12:51:55.603914 136269990262592 checkpointing.py:234] Creating checkpoint manager with ocdbt=False and zarr3=True I0421 12:51:55.603955 136269990262592 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 12:51:55.604284 136269990262592 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 0x7bef1cd389b0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 12:51:58.556478 136269990262592 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 12:51:58.556704 136269990262592 checkpoint_manager.py:708] [process=7][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7bdac0192870>}, handler_registry=None I0421 12:51:58.556951 136269990262592 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7bdac0192870>` 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`. I0421 12:51:58.556999 136269990262592 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7bdac01953d0>` 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`. I0421 12:51:58.557038 136269990262592 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 0x7bdac0192870>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7bdac0192870>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7bdac01953d0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7bdac01953d0>}). I0421 12:51:58.557362 136269990262592 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 12:51:58.557433 136269990262592 async_checkpointer.py:192] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7bd9e0650540> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 12:51:59.491287 136269990262592 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints I0421 12:51:59.899472 136269990262592 checkpoint_manager.py:929] [process=7][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_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7bdac0192e40> I0421 12:51:59.899646 136269990262592 checkpointing.py:302] Checkpoint manager created! I0421 12:52:00.842280 136269990262592 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 12:52:00.842385 136269990262592 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 12:52:01.218624 136269990262592 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 12:52:01.218712 136269990262592 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 12:52:01.235129 136269990262592 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 12:52:01.235189 136269990262592 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 12:52:01.258672 136269990262592 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:52:01.258750 136269990262592 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 12:52:01.275079 136269990262592 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:52:01.275139 136269990262592 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 12:52:01.291379 136269990262592 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:52:01.291439 136269990262592 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 12:52:01.315918 136269990262592 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 12:52:01.315988 136269990262592 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 12:52:01.337033 136269990262592 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 12:52:01.337097 136269990262592 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 12:52:01.556711 136269990262592 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 12:52:01.556872 136269990262592 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 12:52:02.995968 136269990262592 maxtext_utils.py:1827] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0421 12:52:02.996097 136269990262592 maxtext_utils.py:1827] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 12:52:02.996155 136269990262592 maxtext_utils.py:1827] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 12:52:02.996212 136269990262592 maxtext_utils.py:1827] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0421 12:52:02.996264 136269990262592 maxtext_utils.py:1827] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0421 12:52:02.996307 136269990262592 maxtext_utils.py:1827] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0421 12:52:02.996360 136269990262592 maxtext_utils.py:1827] 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) I0421 12:52:02.996410 136269990262592 maxtext_utils.py:1827] 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') I0421 12:52:02.996448 136269990262592 maxtext_utils.py:1827] 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) I0421 12:52:02.996484 136269990262592 maxtext_utils.py:1827] 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) I0421 12:52:02.996532 136269990262592 maxtext_utils.py:1827] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0421 12:52:02.996581 136269990262592 maxtext_utils.py:1827] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0421 12:52:03.486347 136269990262592 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 12:52:03.486440 136269990262592 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0421 12:52:03.501857 136269990262592 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 12:52:03.501919 136269990262592 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0421 12:52:14.504951 136269990262592 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. I0421 12:52:14.505721 136269990262592 metric_logger.py:301] number parameters: 1.104 billion I0421 12:52:26.040673 136269990262592 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 12:52:26.193514 136269990262592 checkpointing.py:798] Waited 0.15282320976257324 seconds for step 0 to finish before starting checkpointing. I0421 12:52:26.195785 136269990262592 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 12:52:26.197769 136269990262592 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 0 I0421 12:52:26.199482 136269990262592 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/0. I0421 12:52:26.534559 136269990262592 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 12:52:26.535423 136269990262592 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0421 12:52:26.535479 136269990262592 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 I0421 12:52:26.808121 136269990262592 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.273635s I0421 12:52:26.808304 136269990262592 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 5.527 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2790951728820801 s) (per-host) I0421 12:52:26.808376 136269990262592 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.279174s (batch_requests_ready=0.002292s, total_serialization_initiated=0.276794s, others=0.000088s) I0421 12:52:26.808494 136269990262592 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.283436s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.283419) I0421 12:52:26.809413 136269990262592 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.61 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/0. I0421 12:52:26.809772 136140991764224 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 13:12:26.809718 I0421 12:52:26.816238 136269990262592 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 12:52:26.816521 136136697571072 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save. I0421 12:52:26.816648 136269990262592 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776775946.1957655, 'wait_for_prev_duration_secs': 6.771087646484375e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776775946.1978588, 'checkpointer_blocking_duration_secs': 0.612065315246582, 'get_old_steps_start_time': 1776775946.8099496, 'get_old_steps_duration_secs': 3.647804260253906e-05, 'checkpoint_manager_blocking_start_time': 1776775946.1939406, 'checkpoint_manager_blocking_duration_secs': 0.6226673126220703} I0421 12:52:26.816762 136269990262592 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 12:52:26.816813 136269990262592 max_utils.py:750] Memstats: After params initialized: I0421 12:52:26.816862 136269990262592 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0)) I0421 12:52:26.816894 136269990262592 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0)) I0421 12:52:26.816919 136269990262592 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0)) I0421 12:52:26.816943 136269990262592 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0)) I0421 12:52:27.132510 136269990262592 metric_logger.py:196] completed step: 0, seconds: 11.535, TFLOP/s/device: 1.178, Tokens/s/device: 177.550, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0421 12:52:27.309985 136269990262592 metric_logger.py:196] completed step: 1, seconds: 1.090, TFLOP/s/device: 12.461, Tokens/s/device: 1878.272, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0421 12:52:27.726788 136269990262592 metric_logger.py:196] completed step: 2, seconds: 0.030, TFLOP/s/device: 450.188, Tokens/s/device: 67857.261, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38547.719 I0421 12:52:27.874309 136269990262592 metric_logger.py:196] completed step: 3, seconds: 0.417, TFLOP/s/device: 32.572, Tokens/s/device: 4909.552, total_weights: 65536, loss: 9.980, lm_loss: 9.980, perplexity: 21590.506 I0421 12:52:27.878898 136269990262592 checkpointing.py:794] Waiting for step 5 to finish before checkpoint... I0421 12:52:28.168301 136269990262592 checkpointing.py:798] Waited 0.2893664836883545 seconds for step 5 to finish before starting checkpointing. I0421 12:52:28.171124 136269990262592 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 12:52:30.408005 2846 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 12:52:32.759861 136136705963776 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/0/items/array_metadatas/process_7 I0421 12:52:37.535475 136140991764224 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 143.518 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.006227970123291 s) (per-host) I0421 12:52:37.535593 136140991764224 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.725708s. I0421 12:52:44.348442 136140991764224 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 17.538541s. I0421 12:52:44.348753 136136697571072 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 12:52:44.348886 136136697571072 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save. I0421 12:52:44.348942 136136697571072 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 12:52:44.351263 136136697571072 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 12:52:44.351462 136269990262592 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0421 12:52:44.351597 136269990262592 checkpoint_manager.py:1452] Waiting for previous save to complete took 16.180470 seconds. If this number is high, consider checkpointing less frequently. I0421 12:52:44.353630 136269990262592 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 5 I0421 12:52:44.356122 136269990262592 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/5. I0421 12:52:45.065706 136269990262592 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0421 12:52:45.065817 136269990262592 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 I0421 12:52:45.102578 136269990262592 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.037909s I0421 12:52:45.102756 136269990262592 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 37.270 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04138898849487305 s) (per-host) I0421 12:52:45.102806 136269990262592 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.041459s (batch_requests_ready=0.001860s, total_serialization_initiated=0.039522s, others=0.000077s) I0421 12:52:45.102897 136269990262592 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.046579s (all_items=0.000017s, per_item={'items': '0.00001669'}, temp_paths=0.046562) I0421 12:52:45.103537 136269990262592 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.75 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/5. I0421 12:52:45.103891 136140464060160 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 13:12:45.103851 I0421 12:52:45.111544 136269990262592 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize I0421 12:52:45.111866 136136697571072 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save. I0421 12:52:45.112035 136269990262592 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776775948.1710956, 'wait_for_prev_duration_secs': 16.18046998977661, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776775964.353669, 'checkpointer_blocking_duration_secs': 0.7503652572631836, 'get_old_steps_start_time': 1776775965.1040547, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776775948.1689193, 'checkpoint_manager_blocking_duration_secs': 16.94308090209961} I0421 12:52:45.112145 136269990262592 checkpointing.py:409] Started an asynchronous checkpoint save for step 5 I0421 12:52:45.112910 136269990262592 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.838, Tokens/s/device: 13390.610, total_weights: 65536, loss: 9.460, lm_loss: 9.460, perplexity: 12840.355 I0421 12:52:45.118766 136269990262592 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.124, Tokens/s/device: 13885.875, total_weights: 65536, loss: 8.959, lm_loss: 8.959, perplexity: 7776.467 I0421 12:52:50.178042 136136705963776 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/5/items/array_metadatas/process_7 I0421 12:52:55.875663 136140464060160 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 146.066 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.814286470413208 s) (per-host) I0421 12:52:55.875792 136140464060160 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.771786s. I0421 12:53:04.079220 136140464060160 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 18.975199s. I0421 12:53:04.079527 136136697571072 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 12:53:04.079653 136136697571072 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save. I0421 12:53:04.079700 136136697571072 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts... I0421 12:53:04.081281 136136697571072 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts. I0421 12:53:07.529022 136269990262592 metric_logger.py:196] completed step: 6, seconds: 17.238, TFLOP/s/device: 0.788, Tokens/s/device: 118.805, total_weights: 65536, loss: 8.469, lm_loss: 8.469, perplexity: 4762.740 I0421 12:53:07.676401 136269990262592 metric_logger.py:196] completed step: 7, seconds: 22.264, TFLOP/s/device: 0.610, Tokens/s/device: 91.986, total_weights: 65536, loss: 8.003, lm_loss: 8.003, perplexity: 2989.151 I0421 12:53:07.826074 136269990262592 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.397, Tokens/s/device: 13474.925, total_weights: 65536, loss: 7.572, lm_loss: 7.572, perplexity: 1943.098 I0421 12:53:07.972754 136269990262592 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 12:53:07.973402 136269990262592 checkpointing.py:798] Waited 0.0006880760192871094 seconds for step 9 to finish before starting checkpointing. I0421 12:53:07.975373 136269990262592 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 12:53:07.976907 136269990262592 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 9 I0421 12:53:07.978354 136269990262592 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/9. I0421 12:53:08.616569 136269990262592 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0421 12:53:08.616658 136269990262592 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 I0421 12:53:08.654746 136269990262592 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.039005s I0421 12:53:08.654889 136269990262592 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 36.311 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.042482852935791016 s) (per-host) I0421 12:53:08.654935 136269990262592 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.042538s (batch_requests_ready=0.001721s, total_serialization_initiated=0.040756s, others=0.000061s) I0421 12:53:08.655012 136269990262592 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.046687s (all_items=0.000012s, per_item={'items': '0.00001168'}, temp_paths=0.046675) I0421 12:53:08.655625 136269990262592 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.68 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/9. I0421 12:53:08.655896 136116363585280 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 13:13:08.655873 I0421 12:53:08.657744 136269990262592 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 12:53:08.658108 136136697571072 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save. I0421 12:53:08.658280 136269990262592 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776775987.9753442, 'wait_for_prev_duration_secs': 7.033348083496094e-05, 'time_between_consecutive_saves_sec': 3.8940227031707764, 'checkpointer_blocking_start_time': 1776775987.9769452, 'checkpointer_blocking_duration_secs': 0.6790478229522705, 'get_old_steps_start_time': 1776775988.6560087, 'get_old_steps_duration_secs': 2.5510787963867188e-05, 'checkpoint_manager_blocking_start_time': 1776775987.9736195, 'checkpoint_manager_blocking_duration_secs': 0.6846210956573486} I0421 12:53:08.658407 136269990262592 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 12:53:08.658456 136269990262592 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 12:53:14.230376 136116455839488 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_15_ocdbt_false/checkpoints/9/items/array_metadatas/process_7 I0421 12:53:18.920628 136116363585280 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 153.237 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.308181285858154 s) (per-host) I0421 12:53:18.920762 136116363585280 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.264791s. I0421 12:53:25.291363 136116363585280 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 16.635377s. I0421 12:53:25.291640 136136697571072 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 12:53:25.291808 136136697571072 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save. I0421 12:53:25.291861 136136697571072 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 12:53:25.293382 136136697571072 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 12:53:25.293569 136269990262592 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0421 12:53:25.293724 136269990262592 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 12:53:25.294724 136269990262592 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.084, Tokens/s/device: 13879.947, total_weights: 65536, loss: 7.181, lm_loss: 7.181, perplexity: 1314.495 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 12:53:34 UTC 2026 EXIT_CODE=0