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[flashinfer][fix] do not check nvcc availability when using pre-downloaded cubins #27990

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Merged
houseroad merged 3 commits into from
Nov 8, 2025
Merged

[flashinfer][fix] do not check nvcc availability when using pre-downloaded cubins #27990

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ac594ea
do not check nvcc availability when using pre-downloaded cubins (#27990)
mxz297 Nov 7, 2025
ff76802
Fix lint
mxz297 Nov 7, 2025
9f7e0eb
Merge branch 'main' into export-D86104899
houseroad Nov 7, 2025
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8 changes: 6 additions & 2 deletions vllm/utils/flashinfer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,9 +43,13 @@ def has_flashinfer() -> bool:
if importlib.util.find_spec("flashinfer") is None:
logger.debug_once("FlashInfer unavailable since package was not found")
return False
# When not using flashinfer cubin,
# Also check if nvcc is available since it's required to JIT compile flashinfer
if shutil.which("nvcc") is None:
logger.debug_once("FlashInfer unavailable since nvcc was not found")
if not envs.VLLM_HAS_FLASHINFER_CUBIN and shutil.which("nvcc") is None:
logger.debug_once(
"FlashInfer unavailable since nvcc was not found "
"and not using pre-downloaded cubins"
)
return False
return True

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