近期研究nagios，特意写了检测cpu负载的python脚本（有借鉴网上资料），顺道练练python脚本，以下采用2种方法获取cpu负载。

1、读取cpu负载文件：

#!/usr/bin/env python
#-*- coding:utf-8 -*-
‘‘‘cpu负载检测 for nagios‘‘‘
import sys
def check_load():
    loadf=open(‘/proc/loadavg‘,‘r‘)
    allavg=loadf.readline()
    load5avg=float(allavg.split()[0])
    load10avg=float(allavg.split()[1])
    load15avg=float(allavg.split()[2])
    loadf.close()
    print load5avg
    n=0
    cpunf=open(‘/proc/cpuinfo‘,‘r‘)
    for i in cpunf.readlines():
        if i.split(‘:‘)[0].strip() == ‘processor‘:
            n+=1
    cpunf.close()
    if load5avg > n:
        print "critical - load average:%.2f,%.2f,%.2f" %(load5avg,load10avg,load15avg)
        sys.exit(2)
    else:
        print "OK - load average:%.2f,%.2f,%.2f" %(load5avg,load10avg,load15avg)
        sys.exit(0)

if __name__ == ‘__main__‘:
    check_load()

2、调用python的os模块获取cpu负载：

#!/usr/bin/env python
#-*- coding:utf-8 -*-
‘‘‘cpu负载检测 for nagios‘‘‘
import os,sys
def check_load():
    (d1,d2,d3)=os.getloadavg()
    print d1
    n=0
    cpunf=open(‘/proc/cpuinfo‘,‘r‘)
    for i in cpunf.readlines():
        if i.split(‘:‘)[0].strip() == ‘processor‘:
            n+=1
    cpunf.close()
    if d1 > n:
        print "critical - load average:%.2f,%.2f,%.2f" %(d1,d2,d3)
        sys.exit(2)
    else:
        print "OK - load average:%.2f,%.2f,%.2f" %(d1,d2,d3)
        sys.exit(0)

if __name__ == ‘__main__‘:
    check_load()

备注：2种方法效果一样，脚本很简单，有好方法的大神，开源出来，互相学习！

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python－检测cpu负载