master/worker prefork process model.

fork.py

#!/usr/bin/env python
from __future__ import unicode_literals, print_function
import os
from time import sleep

WORKERS = 3

_cnt = 0

while _cnt < WORKERS:
    _cnt += 1
    _pid = os.fork()
    if _pid:
        # master
        print("pid {} forked".format(_pid))
    else:
        sleep(3600) # awesome work here

print("all worker forked!")
sleep(3600)