python resource模块使用

import os
import psutil
import resource
import subprocess

def preexec_fn():
    pid = os.getpid()
    ps = psutil.Process(pid)
    ps.set_nice(10)
    resource.setrlimit(resource.RLIMIT_CPU, (1, 1))

print"mother pid", os.getpid()
p = subprocess.Popen(["./cpuhog.sh"], preexec_fn=preexec_fn)
p.wait()
print"mother still alive with pid", os.getpid()