python – 如何并行执行cython文件编译？

所以,我看一下Cython.Build源文件,找到cythonize函数的以下签名：

def cythonize(module_list, exclude=None, nthreads=0, aliases=None,
              quiet=False, force=False, language=None,
              exclude_failures=False, **options):

以下关于cythonize nthreads选项的评论：

"For parallel compilation, set the 'nthreads' option to the number of
concurrent builds."

所以我尝试在setup.py文件中使用此选项,如下所示：

from setuptools import setup
from Cython.Build import cythonize
from Cython.Distutils.extension import Extension

EXTENSIONS = [Extension(...)
              ...
              Extension(...)]

setup(name='...',
      ...
      ext_modules=cythonize(EXTENSIONS, nthreads=8),
      ...)

但我的.pyx文件仍然使用1个线程顺序编译.

我不明白我在这里做错了什么以及如何使用nthreads选项并行执行cythonize编译？

from setuptools import setup
from Cython.Build import cythonize
from Cython.Distutils.extension import Extension

NB_COMPILE_JOBS = 8

EXTENSIONS = [Extension(...)
              ...
              Extension(...)]

def setup_given_extensions(extensions):
    setup(name='...',
          ...
          ext_modules=cythonize(extensions),
          ...)

def setup_extensions_in_sequential():
    setup_given_extensions(EXTENSIONS)

def setup_extensions_in_parallel():
    cythonize(EXTENSIONS, nthreads=NB_COMPILE_JOBS)
    pool = multiprocessing.Pool(processes=NB_COMPILE_JOBS)
    pool.map(setup_given_extensions, EXTENSIONS)
    pool.close()
    pool.join()

if "build_ext" in sys.argv:
    setup_extensions_in_parallel()
else:
    setup_extensions_in_sequential()