I found this lovely cffi implementation of posix_spawn
https://github.com/projectcalico/python-posix-spawn . Since
subprocess.Popen() is too slow on PyPy, this gives a welcome speedup, but
it would probably help on CPython as well. However the file redirection is
probably not correct.
in posix.py:
def exec_subprocess_spawnp(l, env):
pid = posix_spawn.posix_spawnp(l[0], l, env)
return os.waitpid(pid, 0)[1]
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