Python：统计Apache进程占用的物理内存比

#!/usr/bin/env python

import os

from subprocess import Popen, PIPE

def getPid():

    p = Popen(['pidof', 'httpd'], stdout=PIPE, stderr=PIPE)

    pids = p.stdout.read().split()

    for i in pids:

        fn = os.path.join('/proc/',i,'status')

        with open(fn) as fd:

            for line in fd:

                if line.startswith('VmRSS'):

                    http_mem = int(line.split()[1])

                    sum += http_mem

                    break

    return sum

def total_mem(f):

    with open(f) as fd:

        for line in fd:

            if line.startswith('MemTotal'):

                total_mem = int(line.split()[1])

                return total_mem

if __name__ == '__main__':

    pids = getPid()

    http_mem = parsePidFile(pids)

    total = total_mem('/proc/meminfo')

    print "Apache memory is: %s KB" % http_mem

    print "Percent: %.2f" % (http_mem/float(total)*100)+'%'