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()