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Use os.sched_getaffinity for cpu counts when available

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Joe Bateson 2023-08-28 19:20:23 -07:00 • committed by Anthony Sottile
parent 9ebda91889
commit ea8244b229
2 changed files with 33 additions and 2 deletions
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27
tests/lang_base_test.py
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@ -30,6 +30,19 @@ def homedir_mck():
yield
@pytest.fixture
def no_sched_getaffinity():
# Simulates an OS without os.sched_getaffinity available (mac/windows)
# https://docs.python.org/3/library/os.html#interface-to-the-scheduler
with mock.patch.object(
os,
'sched_getaffinity',
create=True,
side_effect=AttributeError,
):
yield
def test_exe_exists_does_not_exist(find_exe_mck, homedir_mck):
find_exe_mck.return_value = None
assert lang_base.exe_exists('ruby') is False
@ -116,7 +129,17 @@ def test_no_env_noop(tmp_path):
assert before == inside == after
def test_target_concurrency_normal():
def test_target_concurrency_sched_getaffinity(no_sched_getaffinity):
with mock.patch.object(
os,
'sched_getaffinity',
return_value=set(range(345)),
):
with mock.patch.dict(os.environ, clear=True):
assert lang_base.target_concurrency() == 345
def test_target_concurrency_without_sched_getaffinity(no_sched_getaffinity):
with mock.patch.object(multiprocessing, 'cpu_count', return_value=123):
with mock.patch.dict(os.environ, {}, clear=True):
assert lang_base.target_concurrency() == 123
@ -134,7 +157,7 @@ def test_target_concurrency_on_travis():
assert lang_base.target_concurrency() == 2
def test_target_concurrency_cpu_count_not_implemented():
def test_target_concurrency_cpu_count_not_implemented(no_sched_getaffinity):
with mock.patch.object(
multiprocessing, 'cpu_count', side_effect=NotImplementedError,
):