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Avoid selecting fav3 for Blackwell #55

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Merged
merged 1 commit into from
Mar 5, 2025
Merged

Avoid selecting fav3 for Blackwell #55

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3 changes: 2 additions & 1 deletion vllm_flash_attn/flash_attn_interface.py
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Original file line number Diff line number Diff line change
Expand Up @@ -41,11 +41,12 @@ def _is_fa3_supported(device = None) -> Tuple[bool, Optional[str]]:
if not FA3_AVAILABLE:
return False, f"FA3 is unavaible due to: {FA3_UNAVAILABLE_REASON}"
if torch.cuda.get_device_capability(device)[0] < 8 \
or torch.cuda.get_device_capability(device)[0] >= 10 \
or torch.cuda.get_device_capability(device) == (8, 6) \
or torch.cuda.get_device_capability(device) == (8, 9):
return False, \
"FA3 is only supported on devices with compute capability >= 8" \
" excluding 8.6 and 8.9"
" excluding 8.6 and 8.9 and Blackwell archs (>=10)"
return True, None

def is_fa_version_supported(fa_version: int, device = None) -> bool:
Expand Down