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Code Issues Projects Releases Packages Wiki Activity Actions 15

GH-84559: Deprecate fork being the multiprocessing default. (#100618)

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This starts the process. Users who don't specify their own start method
and use the default on platforms where it is 'fork' will see a
DeprecationWarning upon multiprocessing.Pool() construction or upon
multiprocessing.Process.start() or concurrent.futures.ProcessPool use.

See the related issue and documentation within this change for details.
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Gregory P. Smith 2023-02-02 15:50:35 -08:00 • committed by GitHub
parent 618b7a8260
commit 0ca67e6313
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16 changed files with 284 additions and 63 deletions
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8
Lib/compileall.py
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@ -97,9 +97,15 @@ def compile_dir(dir, maxlevels=None, ddir=None, force=False,
files = _walk_dir(dir, quiet=quiet, maxlevels=maxlevels)
success = True
if workers != 1 and ProcessPoolExecutor is not None:
import multiprocessing
if multiprocessing.get_start_method() == 'fork':
mp_context = multiprocessing.get_context('forkserver')
else:
mp_context = None
# If workers == 0, let ProcessPoolExecutor choose
workers = workers or None
with ProcessPoolExecutor(max_workers=workers) as executor:
with ProcessPoolExecutor(max_workers=workers,
mp_context=mp_context) as executor:
results = executor.map(partial(compile_file,
ddir=ddir, force=force,
rx=rx, quiet=quiet,