MaxView

XPK Start: Sat Apr 18 00:17:16 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-18 00:17:41.435781: 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)
I0418 00:17:41.616682 139776043521856 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 00:17:50.658643 139776043521856 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 00:17:50.661011 139776043521856 distributed.py:172] Connecting to JAX distributed service on mt-05-fp8-9rggu-slice-job-0-0.mt-05-fp8-9rggu:8482
I0418 00:17:51.648971 139776043521856 max_utils.py:284] Jax distributed system initialized!
I0418 00:17:56.743682 139776043521856 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 00:17:56.743784 139776043521856 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 00:17:56.743840 139776043521856 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
I0418 00:17:56.743880 139776043521856 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 00:17:57.451745 139776043521856 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 00:17:57.452049 139776043521856 checkpointing.py:677] Setting up checkpoint logger...
I0418 00:17:57.452111 139776043521856 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0418 00:17:57.452156 139776043521856 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 00:17:57.452491 139776043521856 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 0x7f1f93718590>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 00:18:02.152663 139776043521856 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 00:18:02.152915 139776043521856 checkpoint_manager.py:708] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f0b08306930>}, handler_registry=None
I0418 00:18:02.153156 139776043521856 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f0b08306930>` 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`.
I0418 00:18:02.153204 139776043521856 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f0b0830a210>` 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`.
I0418 00:18:02.153239 139776043521856 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 0x7f0b08306930>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f0b08306930>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f0b0830a210>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f0b0830a210>}).
I0418 00:18:02.153564 139776043521856 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 00:18:02.153636 139776043521856 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7f0ac0697ec0> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 00:18:03.302314 139776043521856 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints
I0418 00:18:03.700868 139776043521856 checkpoint_manager.py:929] [process=6][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_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f0b08304d70>
I0418 00:18:03.701039 139776043521856 checkpointing.py:301] Checkpoint manager created!
I0418 00:18:04.793488 139776043521856 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 00:18:04.793600 139776043521856 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 00:18:05.180224 139776043521856 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 00:18:05.180314 139776043521856 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 00:18:05.196790 139776043521856 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 00:18:05.196859 139776043521856 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 00:18:05.249473 139776043521856 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 00:18:05.249555 139776043521856 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 00:18:05.265985 139776043521856 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 00:18:05.266045 139776043521856 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 00:18:05.282385 139776043521856 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 00:18:05.282453 139776043521856 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 00:18:05.307911 139776043521856 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 00:18:05.307981 139776043521856 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 00:18:05.359896 139776043521856 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 00:18:05.359972 139776043521856 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 00:18:05.809650 139776043521856 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 00:18:05.809766 139776043521856 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 00:18:07.759493 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.759630 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.759679 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.759719 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.759756 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.759792 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_0/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.759906 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.759958 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.759995 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760028 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760060 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760089 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wi_1/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760118 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760147 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760176 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760205 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760236 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760266 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/mlp/wo/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760294 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760322 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760349 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760375 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760403 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760431 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/key/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760458 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760485 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760512 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760545 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760572 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/output_grad_amax_history

    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760599 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/out/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760628 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760656 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760683 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760710 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760738 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760765 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/query/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760795 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/input_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760841 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/input_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760879 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/kernel_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760908 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/kernel_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760935 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/output_grad_amax_history
    Shape:     float32[16,1024]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.760962 139776043521856 maxtext_utils.py:1654]  params/_overwrite_with_gradient/decoder/layers/self_attention/value/Fp8DirectDotGeneralOp_0/output_grad_scale
    Shape:     float32[16,1]
    Logical:   P()
    Physical:  ()
I0418 00:18:07.761015 139776043521856 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0418 00:18:07.761069 139776043521856 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0418 00:18:07.761105 139776043521856 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0418 00:18:07.761153 139776043521856 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0418 00:18:07.761198 139776043521856 maxtext_utils.py:1654]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0418 00:18:07.761231 139776043521856 maxtext_utils.py:1654]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0418 00:18:07.761286 139776043521856 maxtext_utils.py:1654]  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)
I0418 00:18:07.761348 139776043521856 maxtext_utils.py:1654]  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')
I0418 00:18:07.761385 139776043521856 maxtext_utils.py:1654]  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)
I0418 00:18:07.761419 139776043521856 maxtext_utils.py:1654]  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)
I0418 00:18:07.761463 139776043521856 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0418 00:18:07.761508 139776043521856 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0418 00:18:09.406273 139776043521856 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 00:18:09.406368 139776043521856 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 00:18:09.421785 139776043521856 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 00:18:09.421855 139776043521856 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 00:18:23.224786 139776043521856 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.
I0418 00:18:23.225640 139776043521856 metric_logger.py:301] number parameters: 1.105 billion
I0418 00:18:38.567506 139776043521856 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 00:18:38.735745 139776043521856 checkpointing.py:776] Waited 0.16821956634521484 seconds for step 0 to finish before starting checkpointing.
I0418 00:18:38.738163 139776043521856 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 00:18:38.740303 139776043521856 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0
I0418 00:18:38.742039 139776043521856 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/0.
I0418 00:18:39.520893 139776043521856 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 00:18:39.522058 139776043521856 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array.
I0418 00:18:39.522179 139776043521856 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
I0418 00:18:39.931248 139776043521856 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.410490s
I0418 00:18:39.931428 139776043521856 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 3.681 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.41915273666381836 s) (per-host)
I0418 00:18:39.931482 139776043521856 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.419217s (batch_requests_ready=0.003743s, total_serialization_initiated=0.415401s, others=0.000073s)
I0418 00:18:39.931589 139776043521856 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.423580s (all_items=0.000017s, per_item={'items': '0.00001717'}, temp_paths=0.423563)
I0418 00:18:39.932509 139776043521856 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.19 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/0.
I0418 00:18:39.932793 139649536980736 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 00:38:39.932769
I0418 00:18:39.941254 139776043521856 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 00:18:39.941560 139649024509696 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0418 00:18:39.941718 139776043521856 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776471518.738145, 'wait_for_prev_duration_secs': 6.318092346191406e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776471518.7403445, 'checkpointer_blocking_duration_secs': 1.1925342082977295, 'get_old_steps_start_time': 1776471519.932903, 'get_old_steps_duration_secs': 2.9325485229492188e-05, 'checkpoint_manager_blocking_start_time': 1776471518.7363977, 'checkpoint_manager_blocking_duration_secs': 1.2052812576293945}
I0418 00:18:39.941839 139776043521856 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 00:18:39.941892 139776043521856 max_utils.py:750] 
Memstats: After params initialized:
I0418 00:18:39.941944 139776043521856 max_utils.py:756] 	Using (GB) 0.45 / 31.25 (1.440000%) on TPU_24(process=6,(0,6,0,0))
I0418 00:18:39.941981 139776043521856 max_utils.py:756] 	Using (GB) 0.45 / 31.25 (1.440000%) on TPU_25(process=6,(1,6,0,0))
I0418 00:18:39.942011 139776043521856 max_utils.py:756] 	Using (GB) 0.45 / 31.25 (1.440000%) on TPU_28(process=6,(0,7,0,0))
I0418 00:18:39.942039 139776043521856 max_utils.py:756] 	Using (GB) 0.45 / 31.25 (1.440000%) on TPU_29(process=6,(1,7,0,0))
I0418 00:18:40.266412 139776043521856 metric_logger.py:196] completed step: 0, seconds: 15.342, TFLOP/s/device: 0.886, Tokens/s/device: 133.492, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52776.805
I0418 00:18:40.447726 139776043521856 metric_logger.py:196] completed step: 1, seconds: 1.697, TFLOP/s/device: 8.007, Tokens/s/device: 1206.937, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52761.840
I0418 00:18:41.271041 139776043521856 metric_logger.py:196] completed step: 2, seconds: 0.024, TFLOP/s/device: 567.289, Tokens/s/device: 85507.912, total_weights: 65536, loss: 10.816, lm_loss: 10.816, perplexity: 49832.398
I0418 00:18:41.429301 139776043521856 metric_logger.py:196] completed step: 3, seconds: 0.824, TFLOP/s/device: 16.485, Tokens/s/device: 2484.813, total_weights: 65536, loss: 10.431, lm_loss: 10.431, perplexity: 33901.820
I0418 00:18:41.746908 139776043521856 metric_logger.py:196] completed step: 4, seconds: 0.163, TFLOP/s/device: 83.306, Tokens/s/device: 12556.791, total_weights: 65536, loss: 9.992, lm_loss: 9.992, perplexity: 21847.639
I0418 00:18:41.753379 139776043521856 metric_logger.py:196] completed step: 5, seconds: 0.158, TFLOP/s/device: 85.894, Tokens/s/device: 12946.866, total_weights: 65536, loss: 9.549, lm_loss: 9.549, perplexity: 14035.006
I0418 00:18:43.964264    2781 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 00:18:47.287399 139649045477120 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 81 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/0/items/array_metadatas/process_6
I0418 00:18:58.926844 139649536980736 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 81.370 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 19.41453766822815 s) (per-host)
I0418 00:18:58.926963 139649536980736 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 18.993528s.
I0418 00:19:07.833441 139776043521856 metric_logger.py:196] completed step: 6, seconds: 0.318, TFLOP/s/device: 42.690, Tokens/s/device: 6434.748, total_weights: 65536, loss: 9.111, lm_loss: 9.111, perplexity: 9058.688
I0418 00:19:07.991850 139776043521856 metric_logger.py:196] completed step: 7, seconds: 25.923, TFLOP/s/device: 0.524, Tokens/s/device: 79.003, total_weights: 65536, loss: 8.685, lm_loss: 8.685, perplexity: 5914.720
I0418 00:19:08.150535 139776043521856 metric_logger.py:196] completed step: 8, seconds: 0.163, TFLOP/s/device: 83.385, Tokens/s/device: 12568.658, total_weights: 65536, loss: 8.281, lm_loss: 8.281, perplexity: 3950.010
I0418 00:19:08.155360 139776043521856 checkpointing.py:772] Waiting for step 10 to finish before checkpoint...
I0418 00:19:08.467204 139776043521856 checkpointing.py:776] Waited 0.31180596351623535 seconds for step 10 to finish before starting checkpointing.
I0418 00:19:08.469851 139776043521856 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 00:19:14.333031 139649536980736 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 34.399579s.
I0418 00:19:14.333303 139649024509696 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 00:19:14.333426 139649024509696 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0418 00:19:14.333492 139649024509696 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 00:19:14.336499 139649024509696 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 00:19:14.336686 139776043521856 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0418 00:19:14.336834 139776043521856 checkpoint_manager.py:1452] Waiting for previous save to complete took 5.866989 seconds. If this number is high, consider checkpointing less frequently.
I0418 00:19:14.338575 139776043521856 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 10
I0418 00:19:14.340567 139776043521856 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/10.
I0418 00:19:15.487345 139776043521856 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array.
I0418 00:19:15.487438 139776043521856 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
I0418 00:19:15.525527 139776043521856 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.039259s
I0418 00:19:15.525666 139776043521856 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 33.859 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04556417465209961 s) (per-host)
I0418 00:19:15.525716 139776043521856 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045623s (batch_requests_ready=0.003195s, total_serialization_initiated=0.042365s, others=0.000064s)
I0418 00:19:15.525801 139776043521856 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.049784s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.049769)
I0418 00:19:15.526610 139776043521856 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.19 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/10.
I0418 00:19:15.526947 139649024509696 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 00:39:15.526910
I0418 00:19:15.530620 139776043521856 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 00:19:15.530939 139646348547840 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0418 00:19:15.531099 139776043521856 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776471548.4698038, 'wait_for_prev_duration_secs': 5.866988658905029, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776471554.338614, 'checkpointer_blocking_duration_secs': 1.188474178314209, 'get_old_steps_start_time': 1776471555.5271106, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776471548.4679968, 'checkpoint_manager_blocking_duration_secs': 7.063067436218262}
I0418 00:19:15.531226 139776043521856 checkpointing.py:408] Started an asynchronous checkpoint save for step 10
I0418 00:19:15.531833 139776043521856 metric_logger.py:196] completed step: 9, seconds: 0.158, TFLOP/s/device: 85.761, Tokens/s/device: 12926.845, total_weights: 65536, loss: 7.908, lm_loss: 7.908, perplexity: 2720.116
I0418 00:19:15.539123 139776043521856 metric_logger.py:196] completed step: 10, seconds: 0.159, TFLOP/s/device: 85.658, Tokens/s/device: 12911.279, total_weights: 65536, loss: 7.568, lm_loss: 7.568, perplexity: 1936.198
I0418 00:19:15.698077 139776043521856 metric_logger.py:196] completed step: 11, seconds: 7.381, TFLOP/s/device: 1.841, Tokens/s/device: 277.452, total_weights: 65536, loss: 7.288, lm_loss: 7.288, perplexity: 1463.272
I0418 00:19:15.856416 139776043521856 metric_logger.py:196] completed step: 12, seconds: 0.006, TFLOP/s/device: 2128.310, Tokens/s/device: 320802.005, total_weights: 65536, loss: 7.032, lm_loss: 7.032, perplexity: 1132.061
I0418 00:19:16.014558 139776043521856 metric_logger.py:196] completed step: 13, seconds: 0.160, TFLOP/s/device: 84.667, Tokens/s/device: 12761.953, total_weights: 65536, loss: 6.815, lm_loss: 6.815, perplexity: 911.031
I0418 00:19:16.572937 139776043521856 metric_logger.py:196] completed step: 14, seconds: 0.158, TFLOP/s/device: 86.190, Tokens/s/device: 12991.544, total_weights: 65536, loss: 6.635, lm_loss: 6.635, perplexity: 761.080
I0418 00:19:16.731409 139776043521856 metric_logger.py:196] completed step: 15, seconds: 0.553, TFLOP/s/device: 24.564, Tokens/s/device: 3702.505, total_weights: 65536, loss: 6.492, lm_loss: 6.492, perplexity: 659.915
I0418 00:19:16.889742 139776043521856 metric_logger.py:196] completed step: 16, seconds: 0.163, TFLOP/s/device: 83.143, Tokens/s/device: 12532.202, total_weights: 65536, loss: 6.380, lm_loss: 6.380, perplexity: 589.948
I0418 00:19:17.047995 139776043521856 metric_logger.py:196] completed step: 17, seconds: 0.158, TFLOP/s/device: 85.815, Tokens/s/device: 12935.009, total_weights: 65536, loss: 6.293, lm_loss: 6.293, perplexity: 540.941
I0418 00:19:17.206132 139776043521856 metric_logger.py:196] completed step: 18, seconds: 0.158, TFLOP/s/device: 85.746, Tokens/s/device: 12924.560, total_weights: 65536, loss: 6.223, lm_loss: 6.223, perplexity: 504.108
I0418 00:19:17.363863 139776043521856 checkpointing.py:772] Waiting for step 19 to finish before checkpoint...
I0418 00:19:17.364865 139776043521856 checkpointing.py:776] Waited 0.0010554790496826172 seconds for step 19 to finish before starting checkpointing.
I0418 00:19:17.366906 139776043521856 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 00:19:25.653768 139646314977024 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 81 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/10/items/array_metadatas/process_6
I0418 00:19:58.810022 139649024509696 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.459 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.32988476753235 s) (per-host)
I0418 00:19:58.810128 139649024509696 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.283070s.
I0418 00:20:12.278180 139649024509696 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 56.751107s.
I0418 00:20:12.278461 139646348547840 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 00:20:12.278599 139646348547840 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0418 00:20:12.278650 139646348547840 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0418 00:20:12.281585 139646348547840 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0418 00:20:12.281808 139776043521856 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0418 00:20:12.281945 139776043521856 checkpoint_manager.py:1452] Waiting for previous save to complete took 54.915051 seconds. If this number is high, consider checkpointing less frequently.
I0418 00:20:12.283765 139776043521856 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 19
I0418 00:20:12.285813 139776043521856 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/19.
I0418 00:20:13.009186 139776043521856 jax_array_handlers.py:360] Scheduling D2H of 81 prioritized jax.Array.
I0418 00:20:13.009279 139776043521856 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
I0418 00:20:13.048366 139776043521856 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.040230s
I0418 00:20:13.048535 139776043521856 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 33.174 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04650425910949707 s) (per-host)
I0418 00:20:13.048585 139776043521856 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046565s (batch_requests_ready=0.003141s, total_serialization_initiated=0.043358s, others=0.000066s)
I0418 00:20:13.048692 139776043521856 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050747s (all_items=0.000012s, per_item={'items': '0.00001168'}, temp_paths=0.050736)
I0418 00:20:13.049446 139776043521856 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.77 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/19.
I0418 00:20:13.049734 139646348547840 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 00:40:13.049700
I0418 00:20:13.052493 139776043521856 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 00:20:13.052742 139644201064192 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0418 00:20:13.052900 139776043521856 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776471557.3668709, 'wait_for_prev_duration_secs': 54.9150505065918, 'time_between_consecutive_saves_sec': 3.030329465866089, 'checkpointer_blocking_start_time': 1776471612.2838047, 'checkpointer_blocking_duration_secs': 0.7660825252532959, 'get_old_steps_start_time': 1776471613.0499046, 'get_old_steps_duration_secs': 2.6941299438476562e-05, 'checkpoint_manager_blocking_start_time': 1776471557.3651414, 'checkpoint_manager_blocking_duration_secs': 55.687726974487305}
I0418 00:20:13.053010 139776043521856 checkpointing.py:408] Started an asynchronous checkpoint save for step 19
I0418 00:20:13.053053 139776043521856 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 00:20:19.809404 139646314977024 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 81 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260417_235819/linen_xpk_main_20260417_235819_05_fp8/checkpoints/19/items/array_metadatas/process_6
I0418 00:20:56.231195 139646348547840 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.544 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.229124546051025 s) (per-host)
I0418 00:20:56.231318 139646348547840 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.181459s.
I0418 00:21:07.337360 139646348547840 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 54.287484s.
I0418 00:21:07.337656 139644201064192 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 00:21:07.337782 139644201064192 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0418 00:21:07.337841 139644201064192 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0418 00:21:07.339673 139644201064192 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0418 00:21:07.339867 139776043521856 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0418 00:21:07.340015 139776043521856 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 00:21:07.341026 139776043521856 metric_logger.py:196] completed step: 19, seconds: 0.158, TFLOP/s/device: 85.851, Tokens/s/device: 12940.403, 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: Sat Apr 18 00:21:18 UTC 2026
EXIT_CODE=0