Use len(os.sched_getaffinity(0)) instead of os.cpu_count() (MagicStack#591)

Co-authored-by: Fantix King <fantix.king@gmail.com>

Author: avkarenow

.github/workflows/tests.yml

@@ -13,6 +13,7 @@ jobs:
  test:
  runs-on: ${{ matrix.os }}
  strategy:
+ fail-fast: false
  matrix:
  python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
  os: [ubuntu-latest, macos-latest]

setup.py

@@ -176,7 +176,11 @@ def build_libuv(self):
  cmd,
  cwd=LIBUV_BUILD_DIR, env=env, check=True)
 
- j_flag = '-j{}'.format(os.cpu_count() or 1)
+ try:
+ njobs = len(os.sched_getaffinity(0))
+ except AttributeError:
+ njobs = os.cpu_count()
+ j_flag = '-j{}'.format(njobs or 1)
  c_flag = "CFLAGS={}".format(env['CFLAGS'])
  subprocess.run(
  ['make', j_flag, c_flag],