python 统计单个核cpu使用率

  下面是一段统计linux服务器单个核cpu使用率的python代码，大家可以看看，如果有bug请留言。

# -*- coding: cp936 -*-

import re,time

def _read_cpu_usage():
        """Read the current system cpu usage from /proc/stat"""
        statfile = "/proc/stat"
        cpulist = []
        try:
                f = open(statfile, 'r')
                lines = f.readlines()
        except:
                print "error:无法打开文件%s，系统无法继续运行。" % (statfile)
                return []
        for line in lines:
                tmplist = line.split()
        if len(tmplist) < 5:
                continue
        for b in tmplist:
                m = re.search(r'cpu\d+',b)
                if m is not None:
                        cpulist.append(tmplist)
        f.close()
        return cpulist

def get_cpu_usage():
        cpuusage = {}
        cpustart = {}
        cpuend = {}
        linestart = _read_cpu_usage()
        if not linestart:
                return 0
        for cpustr in linestart:
                usni=long(cpustr[1])+long(cpustr[2])+long(cpustr[3])+long(cpustr[5])+long(cpustr[6])+long(cpustr[7])+long(cpustr[4])
                usn=long(cpustr[1])+long(cpustr[2])+long(cpustr[3])
                cpustart[cpustr[0]] = str(usni)+":"+str(usn)
        sleep = 2
        time.sleep(sleep)
        lineend = _read_cpu_usage()
        if not lineend:
                return 0
        for cpustr in lineend:
                usni=long(cpustr[1])+long(cpustr[2])+long(cpustr[3])+long(cpustr[5])+long(cpustr[6])+long(cpustr[7])+long(cpustr[4])
                usn=long(cpustr[1])+long(cpustr[2])+long(cpustr[3])
                cpuend[cpustr[0]] = str(usni)+":"+str(usn)
        for line in cpustart:
                start = cpustart[line].split(':')
                usni1,usn1 = float(start[0]),float(start[1])
                end = cpuend[line].split(':')
                usni2,usn2 = float(end[0]),float(end[1])
                cpuper=(usn2-usn1)/(usni2-usni1)
                cpuusage[line] = int(100*cpuper)
        
        return cpuusage

if __name__ == '__main__':
        a = get_cpu_usage()
        print a

执行结果，如截图：