XPK Start: Fri Apr 24 15:12:43 UTC 2026 2026-04-24 15:12:47.662492: E external/local_xla/xla/stream_executor/cuda/cuda_fft.cc:467] Unable to register cuFFT factory: Attempting to register factory for plugin cuFFT when one has already been registered WARNING: All log messages before absl::InitializeLog() is called are written to STDERR E0000 00:00:1777043567.675423 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered E0000 00:00:1777043567.679198 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered W0000 00:00:1777043567.690950 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777043567.690971 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777043567.690974 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. W0000 00:00:1777043567.690976 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once. 2026-04-24 15:13:06.859986: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0424 15:13:07.389020 133694480537408 max_utils.py:273] Attempting to initialize the jax distributed system... INFO:2026-04-24 15:13:16,430:jax._src.distributed:140: Starting JAX distributed service on [::]:8482 I0424 15:13:16.430072 133694480537408 distributed.py:140] Starting JAX distributed service on [::]:8482 INFO:2026-04-24 15:13:16,432:jax._src.distributed:157: Connecting to JAX distributed service on mt-06-grad-accum-wmzf8-slice-job-0-0.mt-06-grad-accum-wmzf8:8482 I0424 15:13:16.432368 133694480537408 distributed.py:157] Connecting to JAX distributed service on mt-06-grad-accum-wmzf8-slice-job-0-0.mt-06-grad-accum-wmzf8:8482 I0424 15:13:17.786119 133694480537408 max_utils.py:284] Jax distributed system initialized! I0424 15:13:23.587427 133694480537408 max_utils.py:800] System Information: Jax Version: 0.8.1 I0424 15:13:23.587532 133694480537408 max_utils.py:801] System Information: Jaxlib Version: 0.8.1 I0424 15:13:23.587576 133694480537408 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709 I0424 15:13:23.587611 133694480537408 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0424 15:13:24.208127 133694480537408 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0424 15:13:24.208792 133694480537408 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0424 15:13:24.208995 133694480537408 checkpointing.py:688] Setting up checkpoint logger... I0424 15:13:24.209047 133694480537408 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0424 15:13:24.209090 133694480537408 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None I0424 15:13:24.209456 133694480537408 base_pytree_checkpoint_handler.py:415] 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 0x7997c39b9a90>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0424 15:13:27.132443 133694480537408 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0424 15:13:27.132784 133694480537408 checkpoint_manager.py:709] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x799666fee180>}, handler_registry=None I0424 15:13:27.133031 133694480537408 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x799666fee180>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0424 15:13:27.133081 133694480537408 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7985512b6780>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0424 15:13:27.133116 133694480537408 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 0x799666fee180>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x799666fee180>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7985512b6780>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7985512b6780>}). I0424 15:13:27.133696 133694480537408 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33 I0424 15:13:27.133776 133694480537408 async_checkpointer.py:177] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x798532b80180> timeout: 600 secs and primary_host=0 for async checkpoint writes I0424 15:13:27.847161 133694480537408 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints I0424 15:13:27.849312 133694480537408 checkpoint_manager.py:929] [process=4][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_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x79965d3aba70> I0424 15:13:27.849424 133694480537408 checkpointing.py:302] Checkpoint manager created! I0424 15:13:29.543695 133694480537408 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0424 15:13:29.543802 133694480537408 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 15:13:29.915127 133694480537408 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0424 15:13:29.915224 133694480537408 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 15:13:29.931131 133694480537408 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0424 15:13:29.931189 133694480537408 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0424 15:13:29.953920 133694480537408 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 15:13:29.953986 133694480537408 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 15:13:29.974950 133694480537408 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 15:13:29.975053 133694480537408 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 15:13:29.991185 133694480537408 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0424 15:13:29.991250 133694480537408 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 15:13:30.016500 133694480537408 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0424 15:13:30.016570 133694480537408 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0424 15:13:30.036143 133694480537408 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0424 15:13:30.036206 133694480537408 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0424 15:13:30.225132 133694480537408 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0424 15:13:30.225246 133694480537408 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0424 15:13:31.654314 133694480537408 maxtext_utils.py:1740] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: PartitionSpec('norm',) Physical: (None,) I0424 15:13:31.654442 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0424 15:13:31.654497 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: PartitionSpec('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0424 15:13:31.654554 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: PartitionSpec('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0424 15:13:31.654603 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0424 15:13:31.654641 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: PartitionSpec('norm', 'layers') Physical: (None, None) I0424 15:13:31.654692 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/self_attention/key/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0424 15:13:31.654745 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/self_attention/out/kernel Shape: float32[16,16,128,2048] Logical: PartitionSpec('heads', 'layers', 'kv', 'embed') Physical: (None, None, None, 'fsdp') I0424 15:13:31.654785 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/self_attention/query/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'q_heads', 'kv') Physical: ('fsdp', None, None, None) I0424 15:13:31.654824 133694480537408 maxtext_utils.py:1740] params/params/decoder/layers/self_attention/value/kernel Shape: float32[2048,16,16,128] Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0424 15:13:31.654889 133694480537408 maxtext_utils.py:1740] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: PartitionSpec('embed', 'vocab') Physical: ('fsdp', None) I0424 15:13:31.654953 133694480537408 maxtext_utils.py:1740] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: PartitionSpec('vocab', 'embed') Physical: (None, 'fsdp') I0424 15:13:31.678922 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048]............................................... Unknown. I0424 15:13:31.678992 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048]............................................... (None,). I0424 15:13:31.693629 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,7168]....................................... Unknown. I0424 15:13:31.693685 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,7168]....................................... ('fsdp', None, None). I0424 15:13:31.722425 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[7168,16,2048]....................................... Unknown. I0424 15:13:31.722486 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[7168,16,2048]....................................... (None, None, 'fsdp'). I0424 15:13:31.737025 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16]............................................ Unknown. I0424 15:13:31.737084 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16]............................................ (None, None). I0424 15:13:31.766018 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,16,16,128]..................................... Unknown. I0424 15:13:31.766092 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,16,16,128]..................................... ('fsdp', None, None, None). I0424 15:13:31.780634 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[16,16,128,2048]..................................... Unknown. I0424 15:13:31.780688 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[16,16,128,2048]..................................... (None, None, None, 'fsdp'). I0424 15:13:31.823997 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[2048,32000]......................................... Unknown. I0424 15:13:31.824066 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[2048,32000]......................................... ('fsdp', None). I0424 15:13:31.838520 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Logical: float32[32000,2048]......................................... Unknown. I0424 15:13:31.838576 133694480537408 gradient_accumulation.py:70] gradient_accumulation/inputs Physical: float32[32000,2048]......................................... (None, 'fsdp'). I0424 15:13:32.516755 133694480537408 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0424 15:13:32.516853 133694480537408 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0424 15:13:32.532526 133694480537408 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0424 15:13:32.532584 133694480537408 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0424 15:13:43.481114 133694480537408 max_utils.py:791] Total memory size: 1.7 GB, Output size: 0.4 GB, Temp size: 1.3 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0424 15:13:43.481917 133694480537408 metric_logger.py:289] number parameters: 1.104 billion I0424 15:13:45.582777 133694480537408 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0424 15:13:56.442950 133694480537408 checkpointing.py:798] Waited 10.860151052474976 seconds for step 0 to finish before starting checkpointing. I0424 15:13:56.445652 133694480537408 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0424 15:13:56.447259 133694480537408 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 0 I0424 15:13:56.450029 133694480537408 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints/0. I0424 15:13:57.080322 133694480537408 signaling_client.py:364] Using JaxDistributedSignalingClient I0424 15:13:57.081439 133694480537408 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0424 15:13:57.081496 133694480537408 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0424 15:13:57.325220 133694480537408 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.244981s I0424 15:13:57.325390 133694480537408 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.789 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5530204772949219 s) (per-host) I0424 15:13:57.325441 133694480537408 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.553081s (batch_requests_ready=0.304341s, total_serialization_initiated=0.248672s, others=0.000068s) I0424 15:13:57.325530 133694480537408 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.557190s (all_items=0.000020s, per_item={'items': '0.00002027'}, temp_paths=0.557170) I0424 15:13:57.326498 133575001229056 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0424 15:13:57.326672 133694480537408 async_checkpointer.py:561] Finished blocking save. Time taken: 0.879339s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints/0. I0424 15:13:57.328504 133694480537408 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0424 15:13:57.328784 133571796788992 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0424 15:13:57.328926 133694480537408 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777043636.4456348, 'wait_for_prev_duration_secs': 6.270408630371094e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777043636.4472957, 'checkpointer_blocking_duration_secs': 0.8794817924499512, 'get_old_steps_start_time': 1777043637.3267968, 'get_old_steps_duration_secs': 2.5987625122070312e-05, 'checkpoint_manager_blocking_start_time': 1777043636.4434164, 'checkpoint_manager_blocking_duration_secs': 0.8854734897613525} I0424 15:13:57.329085 133694480537408 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0424 15:13:57.329137 133694480537408 max_utils.py:750] Memstats: After params initialized: I0424 15:13:57.329185 133694480537408 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0)) I0424 15:13:57.329220 133694480537408 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0)) I0424 15:13:57.329247 133694480537408 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0)) I0424 15:13:57.329273 133694480537408 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0)) I0424 15:13:57.590243 133694480537408 metric_logger.py:185] completed step: 0, seconds: 2.101, TFLOP/s/device: 25.871, Tokens/s/device: 3899.562, total_weights: 262144, loss: 10.877 I0424 15:13:58.198168 133694480537408 metric_logger.py:185] completed step: 1, seconds: 12.006, TFLOP/s/device: 4.527, Tokens/s/device: 682.313, total_weights: 262144, loss: 10.877 I0424 15:13:58.776731 133694480537408 metric_logger.py:185] completed step: 2, seconds: 0.030, TFLOP/s/device: 1829.855, Tokens/s/device: 275815.629, total_weights: 262144, loss: 10.563 I0424 15:13:59.355293 133694480537408 metric_logger.py:185] completed step: 3, seconds: 0.584, TFLOP/s/device: 93.061, Tokens/s/device: 14027.157, total_weights: 262144, loss: 10.272 I0424 15:13:59.935061 2338 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0424 15:14:00.512752 133694480537408 metric_logger.py:185] completed step: 4, seconds: 0.579, TFLOP/s/device: 93.946, Tokens/s/device: 14160.565, total_weights: 262144, loss: 10.022 I0424 15:14:00.518695 133694480537408 metric_logger.py:185] completed step: 5, seconds: 0.579, TFLOP/s/device: 93.932, Tokens/s/device: 14158.460, total_weights: 262144, loss: 9.820 I0424 15:14:01.846140 133575009621760 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints/0/items/array_metadatas/process_4 I0424 15:14:34.409517 133575001229056 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 41.969 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.63710141181946 s) (per-host) I0424 15:14:34.409634 133575001229056 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.083024s. I0424 15:14:38.468698 133694480537408 metric_logger.py:185] completed step: 6, seconds: 1.158, TFLOP/s/device: 46.929, Tokens/s/device: 7073.576, total_weights: 262144, loss: 9.667 I0424 15:14:39.047039 133694480537408 metric_logger.py:185] completed step: 7, seconds: 37.372, TFLOP/s/device: 1.454, Tokens/s/device: 219.201, total_weights: 262144, loss: 9.561 I0424 15:14:39.625254 133694480537408 metric_logger.py:185] completed step: 8, seconds: 0.583, TFLOP/s/device: 93.149, Tokens/s/device: 14040.380, total_weights: 262144, loss: 9.496 I0424 15:14:40.203197 133694480537408 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0424 15:14:40.203857 133694480537408 checkpointing.py:798] Waited 0.0006816387176513672 seconds for step 9 to finish before starting checkpointing. I0424 15:14:40.205814 133694480537408 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 15:15:17.949624 133575001229056 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 80.622998s. I0424 15:15:17.949927 133571796788992 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 15:15:17.950060 133571796788992 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0424 15:15:17.950109 133571796788992 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0424 15:15:17.951585 133571796788992 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0424 15:15:17.953111 133694480537408 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0424 15:15:17.953261 133694480537408 checkpoint_manager.py:1458] Waiting for previous save to complete took 37.747451 seconds. If this number is high, consider checkpointing less frequently. I0424 15:15:17.955050 133694480537408 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 9 I0424 15:15:17.958513 133694480537408 async_checkpointer.py:452] [process=4] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints/9. I0424 15:15:18.498996 133694480537408 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array. I0424 15:15:18.499095 133694480537408 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0424 15:15:18.540736 133694480537408 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042689s I0424 15:15:18.540916 133694480537408 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.085 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.303386926651001 s) (per-host) I0424 15:15:18.540969 133694480537408 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.303449s (batch_requests_ready=0.258802s, total_serialization_initiated=0.044576s, others=0.000071s) I0424 15:15:18.541052 133694480537408 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.307481s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.307466) I0424 15:15:18.541968 133571226457856 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started. I0424 15:15:18.542128 133694480537408 async_checkpointer.py:561] Finished blocking save. Time taken: 0.587007s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints/9. I0424 15:15:18.546368 133694480537408 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0424 15:15:18.546697 133571796788992 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0424 15:15:18.546856 133694480537408 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777043680.205785, 'wait_for_prev_duration_secs': 37.747451305389404, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777043717.9550896, 'checkpointer_blocking_duration_secs': 0.5871477127075195, 'get_old_steps_start_time': 1777043718.5422556, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1777043680.2041054, 'checkpoint_manager_blocking_duration_secs': 38.34271764755249} I0424 15:15:18.546969 133694480537408 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0424 15:15:18.547016 133694480537408 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0424 15:15:23.550528 133571788396288 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260424_145744/linen_xpk_feat_nnx_set_defaults_true_20260424_145744_06_grad_accum/checkpoints/9/items/array_metadatas/process_4 I0424 15:16:01.272320 133571226457856 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 36.705 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.03474235534668 s) (per-host) I0424 15:16:01.272439 133571226457856 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.730359s. I0424 15:16:08.643947 133571226457856 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 50.101852s. I0424 15:16:08.644238 133571796788992 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0424 15:16:08.644368 133571796788992 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0424 15:16:08.644419 133571796788992 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0424 15:16:08.645935 133571796788992 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0424 15:16:08.646113 133694480537408 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0424 15:16:08.646254 133694480537408 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0424 15:16:08.646864 133694480537408 metric_logger.py:185] completed step: 9, seconds: 0.578, TFLOP/s/device: 94.001, Tokens/s/device: 14168.819, total_weights: 262144, loss: 9.457 Per train step: Total TFLOPs: 54.35 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Fri Apr 24 15:16:20 UTC 2026 EXIT_CODE=0