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XPK Start: Tue Apr 21 16:46:53 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 16:47:17.458838: 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 16:47:17.638910 138979969611584 max_utils.py:273] Attempting to initialize the jax distributed system...
I0421 16:47:26.680066 138979969611584 distributed.py:149] Starting JAX distributed service on [::]:8482
I0421 16:47:26.682477 138979969611584 distributed.py:172] Connecting to JAX distributed service on mt-05-fp8-us6m5-slice-job-0-0.mt-05-fp8-us6m5:8482
I0421 16:47:28.286483 138979969611584 max_utils.py:284] Jax distributed system initialized!
I0421 16:47:34.380257 138979969611584 max_utils.py:800] System Information: Jax Version: 0.9.2
I0421 16:47:34.380360 138979969611584 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0421 16:47:34.380401 138979969611584 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 16:47:34.380436 138979969611584 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0421 16:47:35.113396 138979969611584 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 16:47:35.113996 138979969611584 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 16:47:35.114180 138979969611584 checkpointing.py:688] Setting up checkpoint logger...
I0421 16:47:35.114231 138979969611584 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0421 16:47:35.114272 138979969611584 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0421 16:47:35.114597 138979969611584 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 0x7e663058e840>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 16:47:38.344735 138979969611584 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0421 16:47:38.344985 138979969611584 checkpoint_manager.py:708] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e51d04e3fb0>}, handler_registry=None
I0421 16:47:38.345230 138979969611584 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e51d04e3fb0>` 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 16:47:38.345279 138979969611584 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e51d04e53d0>` 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 16:47:38.345314 138979969611584 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 0x7e51d04e3fb0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e51d04e3fb0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e51d04e53d0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e51d04e53d0>}).
I0421 16:47:38.345628 138979969611584 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0421 16:47:38.345701 138979969611584 async_checkpointer.py:192] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e51d03082c0> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0421 16:47:39.416587 138979969611584 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints
I0421 16:47:39.831115 138979969611584 checkpoint_manager.py:929] [process=3][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_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e65081758b0>
I0421 16:47:39.831285 138979969611584 checkpointing.py:302] Checkpoint manager created!
I0421 16:47:40.946399 138979969611584 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 16:47:40.946505 138979969611584 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 16:47:41.328308 138979969611584 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 16:47:41.328399 138979969611584 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 16:47:41.344769 138979969611584 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 16:47:41.344829 138979969611584 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 16:47:41.397119 138979969611584 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 16:47:41.397200 138979969611584 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 16:47:41.413677 138979969611584 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 16:47:41.413738 138979969611584 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 16:47:41.430315 138979969611584 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 16:47:41.430378 138979969611584 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 16:47:41.455783 138979969611584 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 16:47:41.455851 138979969611584 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 16:47:41.507293 138979969611584 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 16:47:41.507371 138979969611584 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0421 16:47:41.953334 138979969611584 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 16:47:41.953449 138979969611584 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0421 16:47:43.878537 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878659 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878708 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878747 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878783 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878816 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878848 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878879 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878910 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878956 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.878989 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879020 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879049 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879077 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879106 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879135 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879167 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879195 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879223 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879250 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879276 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879303 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879328 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879355 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879381 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879407 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879433 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879460 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879486 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879517 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879545 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879572 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879598 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879642 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879672 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879699 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879725 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879751 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879777 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879804 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879830 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879856 138979969611584 maxtext_utils.py:1821]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0421 16:47:43.879907 138979969611584 maxtext_utils.py:1821]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0421 16:47:43.879973 138979969611584 maxtext_utils.py:1821]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 16:47:43.880014 138979969611584 maxtext_utils.py:1821]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 16:47:43.880061 138979969611584 maxtext_utils.py:1821]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0421 16:47:43.880109 138979969611584 maxtext_utils.py:1821]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0421 16:47:43.880142 138979969611584 maxtext_utils.py:1821]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0421 16:47:43.880188 138979969611584 maxtext_utils.py:1821]  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 16:47:43.880234 138979969611584 maxtext_utils.py:1821]  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 16:47:43.880271 138979969611584 maxtext_utils.py:1821]  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 16:47:43.880305 138979969611584 maxtext_utils.py:1821]  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 16:47:43.880349 138979969611584 maxtext_utils.py:1821]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0421 16:47:43.880393 138979969611584 maxtext_utils.py:1821]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0421 16:47:45.509187 138979969611584 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 16:47:45.509285 138979969611584 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 16:47:45.524738 138979969611584 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 16:47:45.524797 138979969611584 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 16:47:59.199489 138979969611584 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 16:47:59.200459 138979969611584 metric_logger.py:301] number parameters: 1.105 billion
I0421 16:48:14.452633 138979969611584 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0421 16:48:14.622602 138979969611584 checkpointing.py:798] Waited 0.16994738578796387 seconds for step 0 to finish before starting checkpointing.
I0421 16:48:14.625045 138979969611584 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 16:48:14.626944 138979969611584 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 0
I0421 16:48:14.628355 138979969611584 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/0.
I0421 16:48:14.973866 138979969611584 signaling_client.py:364] Using JaxDistributedSignalingClient
I0421 16:48:14.974840 138979969611584 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array.
I0421 16:48:14.974966 138979969611584 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 16:48:15.400432 138979969611584 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.426684s
I0421 16:48:15.400602 138979969611584 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 3.548 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.43477773666381836 s) (per-host)
I0421 16:48:15.400651 138979969611584 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.434838s (batch_requests_ready=0.003352s, total_serialization_initiated=0.431418s, others=0.000068s)
I0421 16:48:15.400759 138979969611584 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.439428s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.439410)
I0421 16:48:15.401628 138979969611584 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.77 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/0.
I0421 16:48:15.401986 138850051553024 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:08:15.401947
I0421 16:48:15.404064 138979969611584 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 16:48:15.404313 138850026374912 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0421 16:48:15.404434 138979969611584 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776790094.6250257, 'wait_for_prev_duration_secs': 6.079673767089844e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776790094.6269834, 'checkpointer_blocking_duration_secs': 0.7751724720001221, 'get_old_steps_start_time': 1776790095.40218, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776790094.6232343, 'checkpoint_manager_blocking_duration_secs': 0.7811565399169922}
I0421 16:48:15.404545 138979969611584 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0421 16:48:15.404596 138979969611584 max_utils.py:750] 
Memstats: After params initialized:
I0421 16:48:15.404646 138979969611584 max_utils.py:756] 	Using (GB) 0.45 / 31.25 (1.440000%) on TPU_10(process=3,(2,2,0,0))
I0421 16:48:15.404679 138979969611584 max_utils.py:756] 	Using (GB) 0.45 / 31.25 (1.440000%) on TPU_11(process=3,(3,2,0,0))
I0421 16:48:15.404708 138979969611584 max_utils.py:756] 	Using (GB) 0.45 / 31.25 (1.440000%) on TPU_14(process=3,(2,3,0,0))
I0421 16:48:15.404734 138979969611584 max_utils.py:756] 	Using (GB) 0.45 / 31.25 (1.440000%) on TPU_15(process=3,(3,3,0,0))
I0421 16:48:15.719131 138979969611584 metric_logger.py:196] completed step: 0, seconds: 15.252, TFLOP/s/device: 0.891, Tokens/s/device: 134.277, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52776.805
I0421 16:48:15.907658 138979969611584 metric_logger.py:196] completed step: 1, seconds: 1.265, TFLOP/s/device: 10.745, Tokens/s/device: 1619.583, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52761.840
I0421 16:48:16.332610 138979969611584 metric_logger.py:196] completed step: 2, seconds: 0.031, TFLOP/s/device: 438.181, Tokens/s/device: 66047.472, total_weights: 65536, loss: 10.816, lm_loss: 10.816, perplexity: 49832.398
I0421 16:48:16.491272 138979969611584 metric_logger.py:196] completed step: 3, seconds: 0.425, TFLOP/s/device: 31.965, Tokens/s/device: 4818.098, total_weights: 65536, loss: 10.431, lm_loss: 10.431, perplexity: 33901.820
I0421 16:48:16.808818 138979969611584 metric_logger.py:196] completed step: 4, seconds: 0.164, TFLOP/s/device: 82.667, Tokens/s/device: 12460.453, total_weights: 65536, loss: 9.992, lm_loss: 9.992, perplexity: 21847.639
I0421 16:48:16.815352 138979969611584 metric_logger.py:196] completed step: 5, seconds: 0.158, TFLOP/s/device: 85.832, Tokens/s/device: 12937.461, total_weights: 65536, loss: 9.549, lm_loss: 9.549, perplexity: 14035.006
I0421 16:48:23.369302    2818 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0421 16:48:25.560624 138850034767616 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 81 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/0/items/array_metadatas/process_3
I0421 16:48:40.112979 138850051553024 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 62.821 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 25.147104740142822 s) (per-host)
I0421 16:48:40.113106 138850051553024 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 24.711004s.
I0421 16:48:41.235469 138979969611584 metric_logger.py:196] completed step: 6, seconds: 0.318, TFLOP/s/device: 42.693, Tokens/s/device: 6435.091, total_weights: 65536, loss: 9.111, lm_loss: 9.111, perplexity: 9058.688
I0421 16:48:41.393693 138979969611584 metric_logger.py:196] completed step: 7, seconds: 24.263, TFLOP/s/device: 0.560, Tokens/s/device: 84.409, total_weights: 65536, loss: 8.685, lm_loss: 8.685, perplexity: 5914.720
I0421 16:48:41.552536 138979969611584 metric_logger.py:196] completed step: 8, seconds: 0.163, TFLOP/s/device: 83.193, Tokens/s/device: 12539.799, total_weights: 65536, loss: 8.281, lm_loss: 8.281, perplexity: 3950.010
I0421 16:48:41.557542 138979969611584 checkpointing.py:794] Waiting for step 10 to finish before checkpoint...
I0421 16:48:41.870246 138979969611584 checkpointing.py:798] Waited 0.3126704692840576 seconds for step 10 to finish before starting checkpointing.
I0421 16:48:41.873073 138979969611584 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 16:48:48.988143 138850051553024 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 33.586024s.
I0421 16:48:48.988367 138850026374912 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 16:48:48.988433 138850026374912 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0421 16:48:48.988484 138850026374912 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 16:48:48.990189 138850026374912 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 16:48:48.990361 138979969611584 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0421 16:48:48.990502 138979969611584 checkpoint_manager.py:1452] Waiting for previous save to complete took 7.117429 seconds. If this number is high, consider checkpointing less frequently.
I0421 16:48:48.992175 138979969611584 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 10
I0421 16:48:48.994359 138979969611584 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/10.
I0421 16:48:49.696438 138979969611584 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array.
I0421 16:48:49.696536 138979969611584 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 16:48:49.755946 138979969611584 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.060439s
I0421 16:48:49.756117 138979969611584 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 23.162 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.06660747528076172 s) (per-host)
I0421 16:48:49.756168 138979969611584 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.066668s (batch_requests_ready=0.003055s, total_serialization_initiated=0.063545s, others=0.000068s)
I0421 16:48:49.756269 138979969611584 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.070987s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.070972)
I0421 16:48:49.756989 138979969611584 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.76 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/10.
I0421 16:48:49.757325 138847358805760 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:08:49.757287
I0421 16:48:49.759402 138979969611584 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 16:48:49.759727 138850026374912 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0421 16:48:49.759891 138979969611584 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776790121.8730435, 'wait_for_prev_duration_secs': 7.117428541183472, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776790128.9922142, 'checkpointer_blocking_duration_secs': 0.7652637958526611, 'get_old_steps_start_time': 1776790129.7575004, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776790121.8709881, 'checkpoint_manager_blocking_duration_secs': 7.888866662979126}
I0421 16:48:49.760015 138979969611584 checkpointing.py:409] Started an asynchronous checkpoint save for step 10
I0421 16:48:49.760705 138979969611584 metric_logger.py:196] completed step: 9, seconds: 0.158, TFLOP/s/device: 85.819, Tokens/s/device: 12935.581, total_weights: 65536, loss: 7.908, lm_loss: 7.908, perplexity: 2720.116
I0421 16:48:49.768042 138979969611584 metric_logger.py:196] completed step: 10, seconds: 0.159, TFLOP/s/device: 85.596, Tokens/s/device: 12902.006, total_weights: 65536, loss: 7.568, lm_loss: 7.568, perplexity: 1936.198
I0421 16:48:49.926009 138979969611584 metric_logger.py:196] completed step: 11, seconds: 8.208, TFLOP/s/device: 1.655, Tokens/s/device: 249.507, total_weights: 65536, loss: 7.288, lm_loss: 7.288, perplexity: 1463.272
I0421 16:48:50.084275 138979969611584 metric_logger.py:196] completed step: 12, seconds: 0.007, TFLOP/s/device: 2087.117, Tokens/s/device: 314592.934, total_weights: 65536, loss: 7.032, lm_loss: 7.032, perplexity: 1132.061
I0421 16:48:50.645906 138979969611584 metric_logger.py:196] completed step: 13, seconds: 0.159, TFLOP/s/device: 85.593, Tokens/s/device: 12901.438, total_weights: 65536, loss: 6.815, lm_loss: 6.815, perplexity: 911.031
I0421 16:48:50.804379 138979969611584 metric_logger.py:196] completed step: 14, seconds: 0.557, TFLOP/s/device: 24.413, Tokens/s/device: 3679.747, total_weights: 65536, loss: 6.635, lm_loss: 6.635, perplexity: 761.080
I0421 16:48:50.962593 138979969611584 metric_logger.py:196] completed step: 15, seconds: 0.163, TFLOP/s/device: 83.199, Tokens/s/device: 12540.644, total_weights: 65536, loss: 6.492, lm_loss: 6.492, perplexity: 659.915
I0421 16:48:51.120856 138979969611584 metric_logger.py:196] completed step: 16, seconds: 0.158, TFLOP/s/device: 85.757, Tokens/s/device: 12926.274, total_weights: 65536, loss: 6.380, lm_loss: 6.380, perplexity: 589.948
I0421 16:48:51.279290 138979969611584 metric_logger.py:196] completed step: 17, seconds: 0.158, TFLOP/s/device: 85.894, Tokens/s/device: 12946.866, total_weights: 65536, loss: 6.293, lm_loss: 6.293, perplexity: 540.941
I0421 16:48:51.437392 138979969611584 metric_logger.py:196] completed step: 18, seconds: 0.158, TFLOP/s/device: 85.788, Tokens/s/device: 12930.844, total_weights: 65536, loss: 6.223, lm_loss: 6.223, perplexity: 504.108
I0421 16:48:51.595086 138979969611584 checkpointing.py:794] Waiting for step 19 to finish before checkpoint...
I0421 16:48:51.596267 138979969611584 checkpointing.py:798] Waited 0.0011970996856689453 seconds for step 19 to finish before starting checkpointing.
I0421 16:48:51.598582 138979969611584 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 16:48:55.968545 138846285063936 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 81 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/10/items/array_metadatas/process_3
I0421 16:49:32.779783 138847358805760 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 36.662 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.09022641181946 s) (per-host)
I0421 16:49:32.779913 138847358805760 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.022470s.
I0421 16:49:39.986553 138847358805760 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 50.229094s.
I0421 16:49:39.986859 138850026374912 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 16:49:39.986981 138850026374912 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0421 16:49:39.987031 138850026374912 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0421 16:49:39.988660 138850026374912 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0421 16:49:39.988826 138979969611584 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0421 16:49:39.988975 138979969611584 checkpoint_manager.py:1452] Waiting for previous save to complete took 48.390395 seconds. If this number is high, consider checkpointing less frequently.
I0421 16:49:39.991340 138979969611584 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 19
I0421 16:49:39.993491 138979969611584 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/19.
I0421 16:49:40.704732 138979969611584 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array.
I0421 16:49:40.704834 138979969611584 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 16:49:40.765172 138979969611584 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.061514s
I0421 16:49:40.765332 138979969611584 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 22.794 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.06768226623535156 s) (per-host)
I0421 16:49:40.765381 138979969611584 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.067740s (batch_requests_ready=0.002951s, total_serialization_initiated=0.064727s, others=0.000062s)
I0421 16:49:40.765480 138979969611584 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.072911s (all_items=0.000011s, per_item={'items': '0.00001121'}, temp_paths=0.072900)
I0421 16:49:40.766275 138979969611584 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.77 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/19.
I0421 16:49:40.766537 138850026374912 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 17:09:40.766517
I0421 16:49:40.768480 138979969611584 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 16:49:40.768769 138849471170304 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0421 16:49:40.768879 138979969611584 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776790131.598556, 'wait_for_prev_duration_secs': 48.39039492607117, 'time_between_consecutive_saves_sec': 2.6083285808563232, 'checkpointer_blocking_start_time': 1776790179.9913805, 'checkpointer_blocking_duration_secs': 0.7752485275268555, 'get_old_steps_start_time': 1776790180.766646, 'get_old_steps_duration_secs': 2.47955322265625e-05, 'checkpoint_manager_blocking_start_time': 1776790131.5966516, 'checkpoint_manager_blocking_duration_secs': 49.17219638824463}
I0421 16:49:40.769001 138979969611584 checkpointing.py:409] Started an asynchronous checkpoint save for step 19
I0421 16:49:40.769045 138979969611584 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 16:49:46.649241 138846285063936 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 81 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_05_fp8/checkpoints/19/items/array_metadatas/process_3
I0421 16:50:23.339301 138850026374912 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 37.047 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.64160418510437 s) (per-host)
I0421 16:50:23.339428 138850026374912 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.572823s.
I0421 16:50:31.223580 138850026374912 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 50.456957s.
I0421 16:50:31.223828 138849471170304 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 16:50:31.223891 138849471170304 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0421 16:50:31.223948 138849471170304 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0421 16:50:31.226629 138849471170304 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0421 16:50:31.226811 138979969611584 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0421 16:50:31.226989 138979969611584 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 16:50:31.228004 138979969611584 metric_logger.py:196] completed step: 19, seconds: 0.158, TFLOP/s/device: 85.808, Tokens/s/device: 12933.866, 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 16:50:43 UTC 2026
EXIT_CODE=0