import multiprocessing
import time,os,math


def func(msg):
    output=os.popen("ssh %s hostname" %(msg)).read()
    print output


if __name__ =="__main__":
    flist=open('b').readlines()
    pool =multiprocessing.Pool(processes=7)
    for i in flist:
        msg=i.replace('\n','')
        pool.apply_async(func, (msg, ))
    pool.close()
    pool.join()
    print"Sub-process(es) done."