New submission from Arfrever Frehtes Taifersar Arahesis:
In CPython >=3.3, "test" target of Makefile calls Tools/scripts/run_tests.py
script.
This script contains:
def is_multiprocess_flag(arg):
return arg.startswith('-j') or arg.startswith('--multiprocess')
...
def main(regrtest_args):
...
if threading and not any(is_multiprocess_flag(arg) for arg in
regrtest_args):
args.extend(['-j', '0']) # Use all CPU cores
In order to run tests sequentially, in CPython 3.5 and older branches, it is
possible to set EXTRATESTOPTS with -j1:
make test EXTRATESTOPTS="-j1"
In CPython >=3.6, this workaround no longer works, because this code
(Lib/test/regrtest.py in 3.5):
if ns.use_mp is not None:
if ns.use_mp <= 0:
# Use all cores + extras for tests that like to sleep
ns.use_mp = 2 + (os.cpu_count() or 1)
if ns.use_mp == 1:
ns.use_mp = None
Was changed into (Lib/test/libregrtest/cmdline.py in 3.6 and 3.7):
if ns.use_mp is not None:
if ns.use_mp <= 0:
# Use all cores + extras for tests that like to sleep
ns.use_mp = 2 + (os.cpu_count() or 1)
Currently the only remaining ways to run tests sequentially are to locally edit
Tools/scripts/run_tests.py or to not use "test" target of Makefile and to run
Lib/test/regrtest.py directly with appropriate options.
----------
assignee: haypo
components: Tests
messages: 299629
nosy: Arfrever, haypo
priority: normal
severity: normal
status: open
title: test target of Makefile always run tests in parallel mode
versions: Python 3.6, Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue31098>
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