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# -*- coding: utf-8 -*-
# Author: Eric Larson <larson.eric.d@gmail.com>
#
# License: BSD-3-Clause
from contextlib import nullcontext
import multiprocessing
import os
import pytest
from mne.parallel import parallel_func
@pytest.mark.parametrize('n_jobs', [
None, 1, -1, 'loky 2', 'threading 3', 'multiprocessing 4',
])
def test_parallel_func(n_jobs):
"""Test Parallel wrapping."""
joblib = pytest.importorskip('joblib')
if os.getenv('MNE_FORCE_SERIAL', '').lower() in ('true', '1'):
pytest.skip('MNE_FORCE_SERIAL cannot be set')
def fun(x):
return x * 2
if isinstance(n_jobs, str):
backend, n_jobs = n_jobs.split()
n_jobs = want_jobs = int(n_jobs)
ctx = joblib.parallel_backend(backend, n_jobs)
n_jobs = None
else:
ctx = nullcontext()
if n_jobs is not None and n_jobs < 0:
want_jobs = multiprocessing.cpu_count() + 1 + n_jobs
else:
want_jobs = 1
with ctx:
parallel, p_fun, got_jobs = parallel_func(fun, n_jobs)
assert got_jobs == want_jobs
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