XPK Start: Tue Apr 21 11:54:44 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 11:55:07.922156: 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 11:55:08.458266 137145608030016 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 11:55:17.499878 137145608030016 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 11:55:17.502157 137145608030016 distributed.py:172] Connecting to JAX distributed service on mt-05-fp8-4nww1-slice-job-0-0.mt-05-fp8-4nww1:8482 I0421 11:55:19.062081 137145608030016 max_utils.py:284] Jax distributed system initialized! I0421 11:55:25.188642 137145608030016 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 11:55:25.188760 137145608030016 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 11:55:25.188801 137145608030016 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 11:55:25.188837 137145608030016 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 11:55:25.884599 137145608030016 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 11:55:25.885189 137145608030016 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 11:55:25.885370 137145608030016 checkpointing.py:688] Setting up checkpoint logger... I0421 11:55:25.885425 137145608030016 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 11:55:25.885473 137145608030016 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 11:55:25.885815 137145608030016 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 0x7cbafb64c9b0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 11:55:28.832622 137145608030016 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 11:55:28.832995 137145608030016 checkpoint_manager.py:708] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ca5e8752ea0>}, handler_registry=None I0421 11:55:28.833227 137145608030016 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ca5e8752ea0>` 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 11:55:28.833276 137145608030016 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ca5e8755f10>` 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 11:55:28.833311 137145608030016 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 0x7ca5e8752ea0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ca5e8752ea0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ca5e8755f10>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ca5e8755f10>}). I0421 11:55:28.833639 137145608030016 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 11:55:28.833721 137145608030016 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7ca5e84f0180> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 11:55:30.402199 137145608030016 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_05_fp8/checkpoints I0421 11:55:30.813775 137145608030016 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_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_05_fp8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7ca6c82429c0> I0421 11:55:30.813931 137145608030016 checkpointing.py:302] Checkpoint manager created! I0421 11:55:31.915634 137145608030016 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 11:55:31.915751 137145608030016 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 11:55:32.294453 137145608030016 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 11:55:32.294542 137145608030016 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 11:55:32.310728 137145608030016 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 11:55:32.310784 137145608030016 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 11:55:32.363005 137145608030016 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 11:55:32.363090 137145608030016 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 11:55:32.379459 137145608030016 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 11:55:32.379519 137145608030016 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 11:55:32.395780 137145608030016 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 11:55:32.395840 137145608030016 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 11:55:32.420335 137145608030016 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 11:55:32.420398 137145608030016 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 11:55:32.471717 137145608030016 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 11:55:32.471794 137145608030016 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 11:55:32.909113 137145608030016 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 11:55:32.909232 137145608030016 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 11:55:34.824510 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/input_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.824625 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/input_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.824673 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/kernel_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.824727 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/kernel_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.824764 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/output_grad_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.824798 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/output_grad_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.824830 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/input_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.824862 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/input_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.824892 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/kernel_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.824921 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/kernel_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.824951 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/output_grad_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.824980 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/output_grad_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825009 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/input_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825038 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/input_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825068 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/kernel_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825100 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/kernel_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825130 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/output_grad_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825158 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/output_grad_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825190 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/input_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825241 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/input_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825272 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/kernel_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825300 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/kernel_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825328 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/output_grad_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825356 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/output_grad_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825383 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/input_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825410 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/input_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825437 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/kernel_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825464 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/kernel_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825491 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/output_grad_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825518 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/output_grad_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825546 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/input_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825573 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/input_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825600 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/kernel_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825627 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/kernel_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825654 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/output_grad_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825682 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/output_grad_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825756 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/input_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825790 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/input_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825819 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/kernel_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825847 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/kernel_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825874 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/output_grad_amax_history Shape: float32[16,1024] Logical: P() Physical: () I0421 11:55:34.825901 137145608030016 maxtext_utils.py:1827] params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/output_grad_scale Shape: float32[16,1] Logical: P() Physical: () I0421 11:55:34.825952 137145608030016 maxtext_utils.py:1827] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0421 11:55:34.826004 137145608030016 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 11:55:34.826042 137145608030016 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 11:55:34.826090 137145608030016 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 11:55:34.826136 137145608030016 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 11:55:34.826168 137145608030016 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 11:55:34.826221 137145608030016 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 11:55:34.826272 137145608030016 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 11:55:34.826309 137145608030016 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 11:55:34.826343 137145608030016 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 11:55:34.826388 137145608030016 maxtext_utils.py:1827] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0421 11:55:34.826432 137145608030016 maxtext_utils.py:1827] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0421 11:55:36.458385 137145608030016 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 11:55:36.458490 137145608030016 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0421 11:55:36.473890 137145608030016 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 11:55:36.473955 137145608030016 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0421 11:55:49.925239 137145608030016 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 11:55:49.926102 137145608030016 metric_logger.py:301] number parameters: 1.105 billion I0421 11:56:05.092931 137145608030016 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 11:56:05.262457 137145608030016 checkpointing.py:798] Waited 0.16951203346252441 seconds for step 0 to finish before starting checkpointing. I0421 11:56:05.265083 137145608030016 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 11:56:05.266856 137145608030016 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 0 I0421 11:56:05.268426 137145608030016 event_tracking.py:70] [process=4] [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_05_fp8/checkpoints/0. I0421 11:56:05.605294 137145608030016 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 11:56:05.606241 137145608030016 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array. I0421 11:56:05.606357 137145608030016 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 11:56:06.019849 137145608030016 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.414674s I0421 11:56:06.020020 137145608030016 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 3.646 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.42318201065063477 s) (per-host) I0421 11:56:06.020075 137145608030016 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.423248s (batch_requests_ready=0.003652s, total_serialization_initiated=0.419522s, others=0.000074s) I0421 11:56:06.020180 137145608030016 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.427330s (all_items=0.000019s, per_item={'items': '0.00001860'}, temp_paths=0.427311) I0421 11:56:06.021004 137145608030016 event_tracking.py:125] [process=4] [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_05_fp8/checkpoints/0. I0421 11:56:06.021349 137016231679744 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:16:06.021310 I0421 11:56:06.032199 137145608030016 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 11:56:06.032507 137016204396288 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 11:56:06.032661 137145608030016 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_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776772565.2650647, 'wait_for_prev_duration_secs': 6.389617919921875e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776772565.2668931, 'checkpointer_blocking_duration_secs': 0.7546074390411377, 'get_old_steps_start_time': 1776772566.021524, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776772565.2630558, 'checkpoint_manager_blocking_duration_secs': 0.7695667743682861} I0421 11:56:06.032782 137145608030016 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 11:56:06.032834 137145608030016 max_utils.py:750] Memstats: After params initialized: I0421 11:56:06.032886 137145608030016 max_utils.py:756] Using (GB) 0.45 / 31.25 (1.440000%) on TPU_16(process=4,(0,4,0,0)) I0421 11:56:06.032919 137145608030016 max_utils.py:756] Using (GB) 0.45 / 31.25 (1.440000%) on TPU_17(process=4,(1,4,0,0)) I0421 11:56:06.032946 137145608030016 max_utils.py:756] Using (GB) 0.45 / 31.25 (1.440000%) on TPU_20(process=4,(0,5,0,0)) I0421 11:56:06.032971 137145608030016 max_utils.py:756] Using (GB) 0.45 / 31.25 (1.440000%) on TPU_21(process=4,(1,5,0,0)) I0421 11:56:06.347244 137145608030016 metric_logger.py:196] completed step: 0, seconds: 15.167, TFLOP/s/device: 0.896, Tokens/s/device: 135.033, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52776.805 I0421 11:56:06.535559 137145608030016 metric_logger.py:196] completed step: 1, seconds: 1.252, TFLOP/s/device: 10.850, Tokens/s/device: 1635.387, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52761.840 I0421 11:56:06.958270 137145608030016 metric_logger.py:196] completed step: 2, seconds: 0.031, TFLOP/s/device: 441.169, Tokens/s/device: 66497.825, total_weights: 65536, loss: 10.816, lm_loss: 10.816, perplexity: 49832.398 I0421 11:56:07.116400 137145608030016 metric_logger.py:196] completed step: 3, seconds: 0.423, TFLOP/s/device: 32.122, Tokens/s/device: 4841.814, total_weights: 65536, loss: 10.431, lm_loss: 10.431, perplexity: 33901.820 I0421 11:56:07.433610 137145608030016 metric_logger.py:196] completed step: 4, seconds: 0.164, TFLOP/s/device: 82.971, Tokens/s/device: 12506.336, total_weights: 65536, loss: 9.992, lm_loss: 9.992, perplexity: 21847.639 I0421 11:56:07.439606 137145608030016 metric_logger.py:196] completed step: 5, seconds: 0.158, TFLOP/s/device: 85.994, Tokens/s/device: 12961.943, total_weights: 65536, loss: 9.549, lm_loss: 9.549, perplexity: 14035.006 I0421 11:56:09.298443 2850 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 11:56:11.258092 137016212788992 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 81 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_05_fp8/checkpoints/0/items/array_metadatas/process_4 I0421 11:56:26.006079 137016231679744 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 77.404 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 20.409206867218018 s) (per-host) I0421 11:56:26.006202 137016231679744 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 19.984741s. I0421 11:56:31.398446 137145608030016 metric_logger.py:196] completed step: 6, seconds: 0.318, TFLOP/s/device: 42.778, Tokens/s/device: 6448.038, total_weights: 65536, loss: 9.111, lm_loss: 9.111, perplexity: 9058.688 I0421 11:56:31.556929 137145608030016 metric_logger.py:196] completed step: 7, seconds: 23.802, TFLOP/s/device: 0.571, Tokens/s/device: 86.045, total_weights: 65536, loss: 8.685, lm_loss: 8.685, perplexity: 5914.720 I0421 11:56:31.715339 137145608030016 metric_logger.py:196] completed step: 8, seconds: 0.163, TFLOP/s/device: 83.272, Tokens/s/device: 12551.635, total_weights: 65536, loss: 8.281, lm_loss: 8.281, perplexity: 3950.010 I0421 11:56:31.720130 137145608030016 checkpointing.py:794] Waiting for step 10 to finish before checkpoint... I0421 11:56:32.032146 137145608030016 checkpointing.py:798] Waited 0.3119814395904541 seconds for step 10 to finish before starting checkpointing. I0421 11:56:32.035110 137145608030016 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 11:56:33.766348 137016231679744 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 27.744870s. I0421 11:56:33.766615 137016204396288 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 11:56:33.766766 137016204396288 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 11:56:33.766820 137016204396288 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 11:56:33.768384 137016204396288 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 11:56:33.768574 137145608030016 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0421 11:56:33.768731 137145608030016 checkpoint_manager.py:1452] Waiting for previous save to complete took 1.733601 seconds. If this number is high, consider checkpointing less frequently. I0421 11:56:33.770545 137145608030016 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 10 I0421 11:56:33.772632 137145608030016 event_tracking.py:70] [process=4] [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_05_fp8/checkpoints/10. I0421 11:56:34.484388 137145608030016 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array. I0421 11:56:34.484482 137145608030016 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 11:56:34.538142 137145608030016 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.054633s I0421 11:56:34.538312 137145608030016 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 25.256 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.06108450889587402 s) (per-host) I0421 11:56:34.538362 137145608030016 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.061144s (batch_requests_ready=0.003333s, total_serialization_initiated=0.057745s, others=0.000067s) I0421 11:56:34.538465 137145608030016 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.065253s (all_items=0.000017s, per_item={'items': '0.00001669'}, temp_paths=0.065237) I0421 11:56:34.539217 137145608030016 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.77 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_05_fp8/checkpoints/10. I0421 11:56:34.539557 137012979939072 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:16:34.539520 I0421 11:56:34.541568 137145608030016 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize I0421 11:56:34.541943 137016204396288 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 11:56:34.542079 137145608030016 standard_logger.py:34] {'step': 10, '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_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776772592.0350802, 'wait_for_prev_duration_secs': 1.7336010932922363, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776772593.7705843, 'checkpointer_blocking_duration_secs': 0.7691340446472168, 'get_old_steps_start_time': 1776772594.5397418, 'get_old_steps_duration_secs': 3.0994415283203125e-05, 'checkpoint_manager_blocking_start_time': 1776772592.0328681, 'checkpoint_manager_blocking_duration_secs': 2.5091769695281982} I0421 11:56:34.542255 137145608030016 checkpointing.py:409] Started an asynchronous checkpoint save for step 10 I0421 11:56:34.542843 137145608030016 metric_logger.py:196] completed step: 9, seconds: 0.158, TFLOP/s/device: 85.763, Tokens/s/device: 12927.171, total_weights: 65536, loss: 7.908, lm_loss: 7.908, perplexity: 2720.116 I0421 11:56:34.549892 137145608030016 metric_logger.py:196] completed step: 10, seconds: 0.158, TFLOP/s/device: 85.751, Tokens/s/device: 12925.376, total_weights: 65536, loss: 7.568, lm_loss: 7.568, perplexity: 1936.198 I0421 11:56:34.708269 137145608030016 metric_logger.py:196] completed step: 11, seconds: 2.828, TFLOP/s/device: 4.805, Tokens/s/device: 724.294, total_weights: 65536, loss: 7.288, lm_loss: 7.288, perplexity: 1463.272 I0421 11:56:34.866472 137145608030016 metric_logger.py:196] completed step: 12, seconds: 0.006, TFLOP/s/device: 2241.731, Tokens/s/device: 337898.037, total_weights: 65536, loss: 7.032, lm_loss: 7.032, perplexity: 1132.061 I0421 11:56:35.418172 137145608030016 metric_logger.py:196] completed step: 13, seconds: 0.159, TFLOP/s/device: 85.239, Tokens/s/device: 12848.100, total_weights: 65536, loss: 6.815, lm_loss: 6.815, perplexity: 911.031 I0421 11:56:35.576601 137145608030016 metric_logger.py:196] completed step: 14, seconds: 0.547, TFLOP/s/device: 24.838, Tokens/s/device: 3743.887, total_weights: 65536, loss: 6.635, lm_loss: 6.635, perplexity: 761.080 I0421 11:56:35.735311 137145608030016 metric_logger.py:196] completed step: 15, seconds: 0.163, TFLOP/s/device: 83.433, Tokens/s/device: 12575.913, total_weights: 65536, loss: 6.492, lm_loss: 6.492, perplexity: 659.915 I0421 11:56:35.893397 137145608030016 metric_logger.py:196] completed step: 16, seconds: 0.158, TFLOP/s/device: 85.739, Tokens/s/device: 12923.500, total_weights: 65536, loss: 6.380, lm_loss: 6.380, perplexity: 589.948 I0421 11:56:36.051824 137145608030016 metric_logger.py:196] completed step: 17, seconds: 0.159, TFLOP/s/device: 85.707, Tokens/s/device: 12918.690, total_weights: 65536, loss: 6.293, lm_loss: 6.293, perplexity: 540.941 I0421 11:56:36.210159 137145608030016 metric_logger.py:196] completed step: 18, seconds: 0.158, TFLOP/s/device: 85.906, Tokens/s/device: 12948.667, total_weights: 65536, loss: 6.223, lm_loss: 6.223, perplexity: 504.108 I0421 11:56:36.367809 137145608030016 checkpointing.py:794] Waiting for step 19 to finish before checkpoint... I0421 11:56:36.368815 137145608030016 checkpointing.py:798] Waited 0.0010249614715576172 seconds for step 19 to finish before starting checkpointing. I0421 11:56:36.371027 137145608030016 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 11:56:40.251822 137014598944512 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 81 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_05_fp8/checkpoints/10/items/array_metadatas/process_4 I0421 11:57:17.045736 137012979939072 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.111 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.56844091415405 s) (per-host) I0421 11:57:17.045864 137012979939072 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.506187s. I0421 11:57:25.174582 137012979939072 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.634889s. I0421 11:57:25.174882 137016204396288 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 11:57:25.175016 137016204396288 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 11:57:25.175065 137016204396288 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts... I0421 11:57:25.176632 137016204396288 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts. I0421 11:57:25.176843 137145608030016 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10. W0421 11:57:25.176972 137145608030016 checkpoint_manager.py:1452] Waiting for previous save to complete took 48.805949 seconds. If this number is high, consider checkpointing less frequently. I0421 11:57:25.178524 137145608030016 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 19 I0421 11:57:25.180688 137145608030016 event_tracking.py:70] [process=4] [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_05_fp8/checkpoints/19. I0421 11:57:25.881733 137145608030016 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array. I0421 11:57:25.881827 137145608030016 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 11:57:25.936812 137145608030016 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.055991s I0421 11:57:25.936972 137145608030016 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 24.712 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.062429189682006836 s) (per-host) I0421 11:57:25.937020 137145608030016 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.062488s (batch_requests_ready=0.003265s, total_serialization_initiated=0.059159s, others=0.000064s) I0421 11:57:25.937135 137145608030016 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.066545s (all_items=0.000011s, per_item={'items': '0.00001121'}, temp_paths=0.066534) I0421 11:57:25.937918 137145608030016 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.76 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_05_fp8/checkpoints/19. I0421 11:57:25.938243 137014598944512 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:17:25.938210 I0421 11:57:25.940201 137145608030016 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize I0421 11:57:25.940497 137016204396288 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save. I0421 11:57:25.940633 137145608030016 standard_logger.py:34] {'step': 19, '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_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776772596.370999, 'wait_for_prev_duration_secs': 48.80594873428345, 'time_between_consecutive_saves_sec': 2.602570056915283, 'checkpointer_blocking_start_time': 1776772645.178563, 'checkpointer_blocking_duration_secs': 0.75982666015625, 'get_old_steps_start_time': 1776772645.9384093, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776772596.3690963, 'checkpoint_manager_blocking_duration_secs': 49.57150411605835} I0421 11:57:25.940812 137145608030016 checkpointing.py:409] Started an asynchronous checkpoint save for step 19 I0421 11:57:25.940855 137145608030016 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 11:57:30.981530 137013525202688 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 81 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_05_fp8/checkpoints/19/items/array_metadatas/process_4 I0421 11:58:07.457842 137014598944512 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.990 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.583253383636475 s) (per-host) I0421 11:58:07.457966 137014598944512 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.519611s. I0421 11:58:16.874091 137014598944512 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.935719s. I0421 11:58:16.874400 137016204396288 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 11:58:16.874528 137016204396288 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save. I0421 11:58:16.874569 137016204396288 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts... I0421 11:58:16.876093 137016204396288 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts. I0421 11:58:16.876275 137145608030016 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19. I0421 11:58:16.876425 137145608030016 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 11:58:16.877520 137145608030016 metric_logger.py:196] completed step: 19, seconds: 0.159, TFLOP/s/device: 85.682, Tokens/s/device: 12914.943, total_weights: 65536, loss: 6.167, lm_loss: 6.167, perplexity: 476.947 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 11:58:29 UTC 2026 EXIT_CODE=0