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[Bugfix][DCP] Set default CUDAGraphMode to PIECEWISE for DCP #26574

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Merged
merged 4 commits into from
Oct 12, 2025
Merged

[Bugfix][DCP] Set default CUDAGraphMode to PIECEWISE for DCP #26574

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fd6b08b
Set default cudagraph mode to piecewise for DCP
FENP Oct 10, 2025
d97095f
add warning logs
FENP Oct 10, 2025
dace6f0
pre-commit check fix
FENP Oct 10, 2025
a022317
remove redundant check
FENP Oct 10, 2025
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9 changes: 9 additions & 0 deletions vllm/config/vllm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -346,6 +346,15 @@ def __post_init__(self):
or self.model_config.is_encoder_decoder
):
self.compilation_config.cudagraph_mode = CUDAGraphMode.PIECEWISE

# decode context parallel do not support full cudagraphs now.
if self.parallel_config.decode_context_parallel_size > 1:
logger.warning(
"Decode context parallel (DCP) is enabled, which is "
"incompatible with full CUDA graphs. Set "
"cudagraph_mode to PIECEWISE."
)
self.compilation_config.cudagraph_mode = CUDAGraphMode.PIECEWISE
else:
self.compilation_config.cudagraph_mode = CUDAGraphMode.NONE

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