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disable parallel support via env var #1470

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Merged
jswhit merged 1 commit into from
Feb 20, 2026
+14 −3
Merged

disable parallel support via env var #1470

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1 change: 1 addition & 0 deletions Changelog
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
* Change default encoding for stringtochar/chartostring functions from 'utf-8' to 'utf-8'/'ascii' for dtype.kind='U'/'S'
(issue #1464).
* Fix DeprecationWarning for assigning to numpy.ndarray.shape for numpy >= 2.5.0 (issue #1468).
* Disable parallel support even if libs support it via DISABLE_PARALLEL_SUPPORT env var (issue #1389).

version 1.7.4 (tag v1.7.4rel)
================================
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4 changes: 4 additions & 0 deletions _build/utils.py
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Expand Up @@ -113,6 +113,10 @@ def get_netcdf4_include_dir():


def netcdf4_has_parallel_support() -> bool:
# disable parallel support even if libs support it (issue #1389)
DISABLE_PARALLEL_SUPPORT = bool(int(os.environ.get('DISABLE_PARALLEL_SUPPORT', 0)))
if DISABLE_PARALLEL_SUPPORT:
return False
netcdf4_incdir = get_netcdf4_include_dir()
if os.path.exists(ncmetapath := os.path.join(netcdf4_incdir, "netcdf_meta.h")):
with open(ncmetapath) as f:
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12 changes: 9 additions & 3 deletions setup.py
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Expand Up @@ -157,6 +157,8 @@ def extract_version(CYTHON_FNAME):
USE_NCCONFIG = bool(int(os.environ.get('USE_NCCONFIG', 0)))
# override use of setup.cfg with env var.
USE_SETUPCFG = bool(int(os.environ.get('USE_SETUPCFG', 1)))
# disable parallel support even if libs support it (issue #1389)
DISABLE_PARALLEL_SUPPORT = bool(int(os.environ.get('DISABLE_PARALLEL_SUPPORT', 0)))

setup_cfg = 'setup.cfg'
# contents of setup.cfg will override env vars, unless
Expand Down Expand Up @@ -412,9 +414,13 @@ def _populate_hdf5_info(dirstosearch, inc_dirs, libs, lib_dirs):
(netcdf_lib_version > "4.4" and netcdf_lib_version < "4.5"):
has_cdf5_format = True

has_parallel_support = check_has_parallel_support(inc_dirs)
has_has_not = "has" if has_parallel_support else "does not have"
print(f"netcdf lib {has_has_not} parallel functions")
if DISABLE_PARALLEL_SUPPORT:
has_parallel_support = False
print("parallel support disabled via DISABLE_PARALLEL_SUPPORT env var")
else:
has_parallel_support = check_has_parallel_support(inc_dirs)
has_has_not = "has" if has_parallel_support else "does not have"
print(f"netcdf lib {has_has_not} parallel functions")

if has_parallel_support:
# note(stubbiali): mpi4py is not available when using the in-tree build backend
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