#!/usr/bin/env python

from multiprocessing import Pool
import random, time

def worker(key):
    # Some process which occassionally takes a long time
    coin = random.choice(range(20))
    if coin == 0:
        print('long_runner')
        time.sleep(random.choice(range(1000)))
    if coin >= 1:
        print('short timmer')
        time.sleep(1)

if __name__ == '__main__':
    keys = range(30000)
    p = Pool(20)
    p.map(worker,keys)