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Clarify pynvjitlink option precedence. #303

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Merged
kkraus14 merged 2 commits into from
Jun 18, 2025
Merged

Clarify pynvjitlink option precedence. #303

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0a05ea3
Clarify pynvjitlink option precedence.
bdice Jun 16, 2025
4f0eb93
Update numba_cuda/numba/cuda/__init__.py
bdice Jun 18, 2025
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32 changes: 15 additions & 17 deletions numba_cuda/numba/cuda/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,23 +3,21 @@
from numba.core import config
from .utils import _readenv

# Enable pynvjitlink if the environment variables NUMBA_CUDA_ENABLE_PYNVJITLINK
# or CUDA_ENABLE_PYNVJITLINK are set, or if the pynvjitlink module is found. If
# explicitly disabled, do not use pynvjitlink, even if present in the env.
_pynvjitlink_enabled_in_env = _readenv(
"NUMBA_CUDA_ENABLE_PYNVJITLINK", bool, None
)
_pynvjitlink_enabled_in_cfg = getattr(config, "CUDA_ENABLE_PYNVJITLINK", None)

if _pynvjitlink_enabled_in_env is not None:
ENABLE_PYNVJITLINK = _pynvjitlink_enabled_in_env
elif _pynvjitlink_enabled_in_cfg is not None:
ENABLE_PYNVJITLINK = _pynvjitlink_enabled_in_cfg
else:
ENABLE_PYNVJITLINK = importlib.util.find_spec("pynvjitlink") is not None

if not hasattr(config, "CUDA_ENABLE_PYNVJITLINK"):
config.CUDA_ENABLE_PYNVJITLINK = ENABLE_PYNVJITLINK
# Enable pynvjitlink based on the following precedence:
# 1. Config setting "CUDA_ENABLE_PYNVJITLINK" (highest priority)
# 2. Environment variable "NUMBA_CUDA_ENABLE_PYNVJITLINK"
# 3. Auto-detection of pynvjitlink module (lowest priority)
if getattr(config, "CUDA_ENABLE_PYNVJITLINK", None) is None:
if (
_pynvjitlink_enabled_in_env := _readenv(
"NUMBA_CUDA_ENABLE_PYNVJITLINK", bool, None
)
) is not None:
config.CUDA_ENABLE_PYNVJITLINK = _pynvjitlink_enabled_in_env
else:
config.CUDA_ENABLE_PYNVJITLINK = (
importlib.util.find_spec("pynvjitlink") is not None
)

# Upstream numba sets CUDA_USE_NVIDIA_BINDING to 0 by default, so it always
# exists. Override, but not if explicitly set to 0 in the envioronment.
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