python实现监控linux性能及进程消耗性能的方法

本文以实例形式实现了python监控linux性能以及进程消耗性能的方法，具体实现代码如下：

    # -*- coding: utf-8 -*-
    """
    Created on Tue Jun 10 10:20:13 2014

    @author: lifeix
    """

    from collections import OrderedDict
    import time
    import os

    def cpuinfo():
      lines = open('/proc/stat').readlines()
      for line in lines:
        ln = line.split()
        if ln[0].startswith('cpu'):
          return ln;
      return []
    W = cpuinfo()
    one_cpuTotal=long(W[1])+long(W[2])+long(W[3])+long(W[4])+long(W[5])+long(W[6])+long(W[7])
    one_cpuused=long(W[1])+long(W[2])+long(W[3])

    def CPUinfo():
      ''' Return the information in /proc/CPUinfo
      as a dictionary in the following format:
      CPU_info['proc0']={...}
      CPU_info['proc1']={...}
      '''
      CPUinfo=OrderedDict()
      procinfo=OrderedDict()

      nprocs = 0
      f = open('/proc/cpuinfo')
      for line in f.readlines():
        if not line.strip():
          # end of one processor
          CPUinfo['proc%s' % nprocs] = procinfo
          nprocs=nprocs+1
          # Reset
          procinfo=OrderedDict()
        else:
          if len(line.split(':')) == 2:
            procinfo[line.split(':')[0].strip()] = line.split(':')[1].strip()
          else:
            procinfo[line.split(':')[0].strip()] = ''
      return CPUinfo

    def meminfo():
      ''' Return the information in /proc/meminfo
      as a dictionary '''
      meminfo=OrderedDict()

      f = open('/proc/meminfo')
      for line in f.readlines():
        meminfo[line.split(':')[0]] = line.split(':')[1].strip()
      return meminfo

    f = open("sysinfo.log",'a')
    def logSysInfo(cpu,mem,line):
      f.write('\ncpu:%s -------mem: %s------mongocpu:%s'%(cpu,mem,line))
      f.flush();

    def process_info():
      #获取drm_processes 的进程号
      textlist = os.popen('top -bcn 1 -p 12023').readlines()
      line = ''
      for t in textlist:
        if t.find('12023'):
          line = t
      line = line.split(' ')
      #此处的值按照自己的需求去取
      return line[15]
    if __name__=='__main__':
      CPUinfo = CPUinfo()
      for processor in CPUinfo.keys():
        print(CPUinfo[processor]['model name'])
        f.write("cpu:%s"%CPUinfo[processor]['model name'])
      #meminfo = meminfo()
      #print('Total memory: {0}'.format(meminfo['MemTotal'])) 

      try:
        while True:
          line = process_info()
          time.sleep(2)
          mi = meminfo()
          print('Free memory: {0}'.format(mi['MemFree']))
          W = cpuinfo()
          two_cpuTotal=long(W[1])+long(W[2])+long(W[3])+long(W[4])+long(W[5])+long(W[6])+long(W[7])
          two_cpuused=long(W[1])+long(W[2])+long(W[3])
          cpuused=float(two_cpuused-one_cpuused)/(two_cpuTotal-one_cpuTotal)
          print ('%.2f%%'%(cpuused*100))
          print line
          cpu = '%.2f%%'%(cpuused*100)
          logSysInfo(cpu,format(mi['MemFree']),line)
      except KeyboardInterrupt, e:
        print ("\ncpumonit exited")
        f.close()
    f.close()