monitor.py

#!/usr/bin/env python
class cpu_info:
     def __init__(self):
         self.user = 0
         self.sys = 0
         self.idle = 0
         self.iowait = 0

     def copy(self,inf):
         self.user = inf.user
         self.sys = inf.sys
         self.idle = inf.idle
         self.iowait = inf.iowait

if __name__ == '__main__':
    import time, subprocess
    old = cpu_info()
    new = cpu_info()
    master = cpu_info()
    
    dzenProc = subprocess.Popen(("dzen2 -p -ta c -h 16 -bg '#2f2f2f' -x 320 -y 0 -w 60 -sa c -e button3=exit -xs 0 -fn '-*-mintsmild-*-r-*-*-11-*-*-*-*-*-*-*'"), shell=True, stdin=subprocess.PIPE)
    while 1:
        f = file("/proc/stat","r")
        fcon = f.read().split("\n")[0].split()
        new.user, unice, new.sys, new.idle, new.iowait = [
                int(x) for x in fcon[1:6] ]

        new.user += unice
        master.user = new.user - old.user

        master.sys = new.sys - old.sys
        master.idle   = new.idle - old.idle
        master.iowait = new.iowait - old.iowait

        maxval = master.user + master.sys + master.idle + master.iowait
        curval = master.user + master.sys + master.iowait

        old.copy(new)
        dzenProc.stdin.write("^tw() ^fg(#dfdfdf) ^i(/usr/share/xbms/cpu.xbm) : %d%%\n" % ( (float(curval)/maxval) * 100 ))
        time.sleep(1)