python降低cpu的占用

import signal
import resource
import os
import time
from multiprocessing import Process

def time_exceeded(signo, frame):
    time.sleep(0.1)
    # raise SystemExit(1)
def set_max_runtime(seconds):
    soft,hard = resource.getrlimit(resource.RLIMIT_CPU)
    resource.setrlimit(resource.RLIMIT_CPU, (seconds, soft))
    signal.signal(signal.SIGXCPU, time_exceeded)

if __name__ == '__main__':
    set_max_runtime(5)
    while True:
        pass