XPK Start: Mon Apr 20 15:48:43 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-20 15:49:07.415468: 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) I0420 15:49:07.593057 131960965498688 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 15:49:16.632573 131960965498688 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 15:49:16.635345 131960965498688 distributed.py:172] Connecting to JAX distributed service on mt-04-int8-2ugmo-slice-job-0-0.mt-04-int8-2ugmo:8482 I0420 15:49:18.068390 131960965498688 max_utils.py:284] Jax distributed system initialized! I0420 15:49:23.173704 131960965498688 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 15:49:23.173812 131960965498688 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 15:49:23.173851 131960965498688 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 I0420 15:49:23.173885 131960965498688 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 15:49:23.868773 131960965498688 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 15:49:23.869361 131960965498688 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 15:49:23.869665 131960965498688 checkpointing.py:688] Setting up checkpoint logger... I0420 15:49:23.869725 131960965498688 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 15:49:23.869767 131960965498688 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 15:49:23.870091 131960965498688 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 0x7803d6a4c170>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 15:49:26.892600 131960965498688 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 15:49:26.892836 131960965498688 checkpoint_manager.py:708] [process=2][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x77f048204860>}, handler_registry=None I0420 15:49:26.893076 131960965498688 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x77f048204860>` 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`. I0420 15:49:26.893124 131960965498688 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x77f048206600>` 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`. I0420 15:49:26.893159 131960965498688 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 0x77f048204860>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x77f048204860>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x77f048206600>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x77f048206600>}). I0420 15:49:26.893477 131960965498688 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 15:49:26.893560 131960965498688 async_checkpointer.py:192] [process=2][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x77ef184ff740> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 15:49:28.498111 131960965498688 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints I0420 15:49:28.519546 131960965498688 checkpoint_manager.py:929] [process=2][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_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x77f0482049e0> I0420 15:49:28.519683 131960965498688 checkpointing.py:302] Checkpoint manager created! I0420 15:49:29.680187 131960965498688 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 15:49:29.680296 131960965498688 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 15:49:30.070130 131960965498688 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 15:49:30.070221 131960965498688 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 15:49:30.086576 131960965498688 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 15:49:30.086634 131960965498688 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 15:49:30.151783 131960965498688 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 15:49:30.151867 131960965498688 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 15:49:30.168229 131960965498688 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 15:49:30.168292 131960965498688 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 15:49:30.184450 131960965498688 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 15:49:30.184512 131960965498688 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 15:49:30.209477 131960965498688 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 15:49:30.209559 131960965498688 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 15:49:30.275290 131960965498688 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 15:49:30.275374 131960965498688 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 15:49:30.789071 131960965498688 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 15:49:30.789181 131960965498688 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 15:49:33.254778 131960965498688 maxtext_utils.py:1827] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0420 15:49:33.254902 131960965498688 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) I0420 15:49:33.254955 131960965498688 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) I0420 15:49:33.255014 131960965498688 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') I0420 15:49:33.255091 131960965498688 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) I0420 15:49:33.255141 131960965498688 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) I0420 15:49:33.255204 131960965498688 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) I0420 15:49:33.255269 131960965498688 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') I0420 15:49:33.255310 131960965498688 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) I0420 15:49:33.255346 131960965498688 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) I0420 15:49:33.255393 131960965498688 maxtext_utils.py:1827] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0420 15:49:33.255440 131960965498688 maxtext_utils.py:1827] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0420 15:49:34.650363 131960965498688 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0420 15:49:34.650461 131960965498688 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0420 15:49:34.665980 131960965498688 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0420 15:49:34.666048 131960965498688 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0420 15:49:47.929028 131960965498688 max_utils.py:791] Total memory size: 1.8 GB, Output size: 0.4 GB, Temp size: 1.4 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0420 15:49:47.929844 131960965498688 metric_logger.py:301] number parameters: 1.104 billion I0420 15:50:03.166550 131960965498688 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 15:50:03.410194 131960965498688 checkpointing.py:798] Waited 0.24364686012268066 seconds for step 0 to finish before starting checkpointing. I0420 15:50:03.412655 131960965498688 checkpoint_manager.py:2009] [process=2][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 15:50:03.414615 131960965498688 checkpoint_manager.py:1512] [process=2] Saving checkpoint at step 0 I0420 15:50:03.416011 131960965498688 event_tracking.py:70] [process=2] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints/0. I0420 15:50:04.149735 131960965498688 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 15:50:04.150701 131960965498688 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0420 15:50:04.150761 131960965498688 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 I0420 15:50:04.437921 131960965498688 base_pytree_checkpoint_handler.py:154] [process=2][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.288258s I0420 15:50:04.438106 131960965498688 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/blocking_gbytes_per_sec: 5.247 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29396986961364746 s) (per-host) I0420 15:50:04.438161 131960965498688 base_pytree_checkpoint_handler.py:768] [process=2][thread=MainThread] Initiated Pytree async_save. Time taken: 0.294035s (batch_requests_ready=0.002182s, total_serialization_initiated=0.291780s, others=0.000073s) I0420 15:50:04.438254 131960965498688 composite_checkpoint_handler.py:715] [process=2][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.298509s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.298491) I0420 15:50:04.439032 131960965498688 event_tracking.py:125] [process=2] [async] Finished blocking save in 1.02 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints/0. I0420 15:50:04.439348 131830905132800 async_checkpointer.py:76] [process=2][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 16:10:04.439310 I0420 15:50:04.441373 131960965498688 checkpoint_manager.py:1560] [process=2][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 15:50:04.441679 131828744693504 async_checkpointer.py:280] [process=2][thread=save_finalize] Waiting for background save thread=async_save. I0420 15:50:04.441838 131960965498688 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776700203.412637, 'wait_for_prev_duration_secs': 6.4849853515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776700203.414654, 'checkpointer_blocking_duration_secs': 1.0248496532440186, 'get_old_steps_start_time': 1776700204.4395425, 'get_old_steps_duration_secs': 3.933906555175781e-05, 'checkpoint_manager_blocking_start_time': 1776700203.4107168, 'checkpoint_manager_blocking_duration_secs': 1.031080961227417} I0420 15:50:04.441948 131960965498688 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 15:50:04.441996 131960965498688 max_utils.py:750] Memstats: After params initialized: I0420 15:50:04.442046 131960965498688 max_utils.py:756] Using (GB) 0.44 / 31.25 (1.408000%) on TPU_8(process=2,(0,2,0,0)) I0420 15:50:04.442079 131960965498688 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_9(process=2,(1,2,0,0)) I0420 15:50:04.442106 131960965498688 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_12(process=2,(0,3,0,0)) I0420 15:50:04.442129 131960965498688 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_13(process=2,(1,3,0,0)) I0420 15:50:04.751501 131960965498688 metric_logger.py:196] completed step: 0, seconds: 15.237, TFLOP/s/device: 0.892, Tokens/s/device: 134.414, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52796.277 I0420 15:50:05.021352 131960965498688 metric_logger.py:196] completed step: 1, seconds: 1.583, TFLOP/s/device: 8.581, Tokens/s/device: 1293.409, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52796.277 I0420 15:50:05.429816 131960965498688 metric_logger.py:196] completed step: 2, seconds: 0.041, TFLOP/s/device: 331.920, Tokens/s/device: 50030.536, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28634.820 I0420 15:50:05.659312 131960965498688 metric_logger.py:196] completed step: 3, seconds: 0.408, TFLOP/s/device: 33.263, Tokens/s/device: 5013.722, total_weights: 65536, loss: 9.731, lm_loss: 9.731, perplexity: 16827.199 I0420 15:50:06.118723 131960965498688 metric_logger.py:196] completed step: 4, seconds: 0.235, TFLOP/s/device: 57.749, Tokens/s/device: 8704.596, total_weights: 65536, loss: 9.272, lm_loss: 9.272, perplexity: 10638.531 I0420 15:50:06.124939 131960965498688 metric_logger.py:196] completed step: 5, seconds: 0.229, TFLOP/s/device: 59.209, Tokens/s/device: 8924.681, total_weights: 65536, loss: 8.887, lm_loss: 8.887, perplexity: 7233.941 I0420 15:50:13.035472 2902 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 15:50:15.446384 131828786657024 array_metadata_store.py:203] [process=2][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints/0/items/array_metadatas/process_2 I0420 15:50:35.994618 131960965498688 metric_logger.py:196] completed step: 6, seconds: 0.460, TFLOP/s/device: 29.548, Tokens/s/device: 4453.868, total_weights: 65536, loss: 8.588, lm_loss: 8.588, perplexity: 5365.468 I0420 15:50:36.224587 131960965498688 metric_logger.py:196] completed step: 7, seconds: 29.642, TFLOP/s/device: 0.458, Tokens/s/device: 69.092, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4358.779 I0420 15:50:36.455492 131960965498688 metric_logger.py:196] completed step: 8, seconds: 0.234, TFLOP/s/device: 58.105, Tokens/s/device: 8758.200, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.453 I0420 15:50:36.684340 131960965498688 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 15:50:36.685034 131960965498688 checkpointing.py:798] Waited 0.0007147789001464844 seconds for step 9 to finish before starting checkpointing. I0420 15:50:36.687137 131960965498688 checkpoint_manager.py:2020] [process=2][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 15:50:44.220617 131830905132800 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/gbytes_per_sec: 39.415 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.07644081115723 s) (per-host) I0420 15:50:44.220739 131830905132800 async_checkpointer.py:90] [process=2][thread=async_save] 3 Handler Commit operations completed. Time taken: 39.781280s. I0420 15:50:51.981571 131830905132800 async_checkpointer.py:160] [process=2][thread=async_save] Background save thread done. Time taken: 47.542096s. I0420 15:50:51.981883 131828744693504 async_checkpointer.py:288] [process=2][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 15:50:51.982024 131828744693504 async_checkpointer.py:298] [process=2][thread=save_finalize] No errors found in background save thread=async_save. I0420 15:50:51.982091 131828744693504 checkpoint_manager.py:2137] [process=2][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 15:50:51.984553 131828744693504 checkpoint_manager.py:2146] [process=2][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 15:50:51.984732 131960965498688 checkpoint_manager.py:2032] [process=2][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0420 15:50:51.984874 131960965498688 checkpoint_manager.py:1452] Waiting for previous save to complete took 15.297731 seconds. If this number is high, consider checkpointing less frequently. I0420 15:50:51.986700 131960965498688 checkpoint_manager.py:1512] [process=2] Saving checkpoint at step 9 I0420 15:50:51.988928 131960965498688 event_tracking.py:70] [process=2] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints/9. I0420 15:50:52.729727 131960965498688 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0420 15:50:52.729818 131960965498688 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 I0420 15:50:52.763177 131960965498688 base_pytree_checkpoint_handler.py:154] [process=2][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034534s I0420 15:50:52.763314 131960965498688 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/blocking_gbytes_per_sec: 40.656 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.037941932678222656 s) (per-host) I0420 15:50:52.763361 131960965498688 base_pytree_checkpoint_handler.py:768] [process=2][thread=MainThread] Initiated Pytree async_save. Time taken: 0.037998s (batch_requests_ready=0.001774s, total_serialization_initiated=0.036161s, others=0.000063s) I0420 15:50:52.763442 131960965498688 composite_checkpoint_handler.py:715] [process=2][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.042169s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.042153) I0420 15:50:52.764212 131960965498688 event_tracking.py:125] [process=2] [async] Finished blocking save in 0.78 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints/9. I0420 15:50:52.764508 131828744693504 async_checkpointer.py:76] [process=2][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 16:10:52.764476 I0420 15:50:52.766432 131960965498688 checkpoint_manager.py:1560] [process=2][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 15:50:52.766706 131828786657024 async_checkpointer.py:280] [process=2][thread=save_finalize] Waiting for background save thread=async_save. I0420 15:50:52.766842 131960965498688 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776700236.6871064, 'wait_for_prev_duration_secs': 15.297730684280396, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776700251.9867408, 'checkpointer_blocking_duration_secs': 0.7779183387756348, 'get_old_steps_start_time': 1776700252.7646828, 'get_old_steps_duration_secs': 3.170967102050781e-05, 'checkpoint_manager_blocking_start_time': 1776700236.6852584, 'checkpoint_manager_blocking_duration_secs': 16.08155083656311} I0420 15:50:52.767003 131960965498688 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 15:50:52.767048 131960965498688 checkpoint_manager.py:2020] [process=2][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 15:50:58.414455 131805197829888 array_metadata_store.py:203] [process=2][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260420_153543/linen_xpk_feat_nnx_post_train_fixes_20260420_153543_04_int8/checkpoints/9/items/array_metadatas/process_2 I0420 15:51:35.045594 131828744693504 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/gbytes_per_sec: 37.325 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.3201789855957 s) (per-host) I0420 15:51:35.045720 131828744693504 async_checkpointer.py:90] [process=2][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.281087s. I0420 15:51:45.164677 131828744693504 async_checkpointer.py:160] [process=2][thread=async_save] Background save thread done. Time taken: 52.400029s. I0420 15:51:45.164971 131828786657024 async_checkpointer.py:288] [process=2][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 15:51:45.165106 131828786657024 async_checkpointer.py:298] [process=2][thread=save_finalize] No errors found in background save thread=async_save. I0420 15:51:45.165157 131828786657024 checkpoint_manager.py:2137] [process=2][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 15:51:45.167230 131828786657024 checkpoint_manager.py:2146] [process=2][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 15:51:45.167410 131960965498688 checkpoint_manager.py:2032] [process=2][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 15:51:45.167570 131960965498688 checkpoint_manager.py:2009] [process=2][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 15:51:45.168587 131960965498688 metric_logger.py:196] completed step: 9, seconds: 0.230, TFLOP/s/device: 59.056, Tokens/s/device: 8901.523, total_weights: 65536, loss: 8.175, lm_loss: 8.175, perplexity: 3552.333 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Mon Apr 20 15:51:53 UTC 2026 EXIT_CODE=0