Skip to content

gh-146004: propagate all -X options to multiprocessing child processes #146005

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
gpshead wants to merge 1 commit into
base: main
Choose a base branch
from
Draft

gh-146004: propagate all -X options to multiprocessing child processes #146005

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 10 additions & 9 deletions Lib/subprocess.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -351,15 +351,16 @@ def _args_from_interpreter_flags():
# -X options
if dev_mode:
args.extend(('-X', 'dev'))
for opt in ('faulthandler', 'tracemalloc', 'importtime',
'frozen_modules', 'showrefcount', 'utf8', 'gil'):
if opt in xoptions:
value = xoptions[opt]
if value is True:
arg = opt
else:
arg = '%s=%s' % (opt, value)
args.extend(('-X', arg))
for opt in sorted(xoptions):
if opt == 'dev':
# handled above via sys.flags.dev_mode
continue
value = xoptions[opt]
if value is True:
arg = opt
else:
arg = '%s=%s' % (opt, value)
args.extend(('-X', arg))

return args

Expand Down
7 changes: 7 additions & 0 deletions Lib/test/test_support.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -569,12 +569,19 @@ def test_args_from_interpreter_flags(self):
# -X options
['-X', 'dev'],
['-Wignore', '-X', 'dev'],
['-X', 'cpu_count=4'],
['-X', 'disable-remote-debug'],
['-X', 'faulthandler'],
['-X', 'importtime'],
['-X', 'importtime=2'],
['-X', 'int_max_str_digits=1000'],
['-X', 'lazy_imports=all'],
['-X', 'no_debug_ranges'],
['-X', 'pycache_prefix=/tmp/pycache'],
['-X', 'showrefcount'],
['-X', 'tracemalloc'],
['-X', 'tracemalloc=3'],
['-X', 'warn_default_encoding'],
):
with self.subTest(opts=opts):
self.check_options(opts, 'args_from_interpreter_flags')
Expand Down
9 changes: 9 additions & 0 deletions Misc/NEWS.d/next/Library/2026-03-16-00-00-00.gh-issue-146004.xOptProp.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
All :option:`-X` options from the Python command line are now propagated to
child processes spawned by :mod:`multiprocessing`, not just a hard-coded
subset. This makes the behavior consistent between default "spawn" and
"forkserver" start methods and the old "fork" start method. The options
that were previously not propagated are: ``context_aware_warnings``,
``cpu_count``, ``disable-remote-debug``, ``int_max_str_digits``,
``lazy_imports``, ``no_debug_ranges``, ``pathconfig_warnings``, ``perf``,
``perf_jit``, ``presite``, ``pycache_prefix``, ``thread_inherit_context``,
and ``warn_default_encoding``.
Loading