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#!/usr/bin/env python #encoding: utf-8 ''' 思路: /proc/xx_pid/status 文件中的关键字段 VmRSS 来获取某个进程占用的物理内存 步骤: 获取 httpd 进程ID列表 --> 通过每个进程id来获取该进程占用物理内存 ''' from subprocess import Popen, PIPE import os,sys # 通过程序名称获取 pid 列表 def getProgPids(prog): p = Popen([ 'pidof' , prog], stdout = PIPE, stderr = PIPE) pids = p.stdout.read().split() return pids # 通过具体的进程 id 来获取该进程占用的物理内存 def getMemByPid(pid): fn = os.path.join( '/proc' , pid, 'status' ) with open (fn) as fd: for line in fd: if line.startswith( 'VmRSS' ): mem = int (line.split()[ 1 ]) break return mem # 获取 httpd 服务所有进程占用的物理内存 def getHttpdMem(): httpd_mem_sum = 0 pids = getProgPids( 'httpd' ) for pid in pids: httpd_mem_sum + = getMemByPid(pid) return httpd_mem_sum # 获取系统总的物理内存 def getOsTotalMemory(): with open ( '/proc/meminfo' ) as fd: for line in fd: if line.startswith( 'MemTotal' ): total_mem = int (line.split()[ 1 ]) break return total_mem if __name__ = = '__main__' : http_mem = getHttpdMem() total_mem = getOsTotalMemory() scale = http_mem / float (total_mem) * 100 print 'Httpd: %d KB' % http_mem print 'Percent: %.2f%%' % scale |