Calculating CPU usage with python on Linux

This small script prints overall CPU usage in a Linux system. You can use the get_cpu() function to get the CPU usage between 0.0 and 1.0 (all CPU cores were taken into consideration, so the maximal value is also 1.0 on a multi-core system).

import os, time

last_worktime=0
last_idletime=0

def get_cpu():
	global last_worktime, last_idletime
	f=open("/proc/stat","r")
	line=""
	while not "cpu " in line: line=f.readline()
	f.close()
	spl=line.split(" ")
	worktime=int(spl[2])+int(spl[3])+int(spl[4])
	idletime=int(spl[5])
	dworktime=(worktime-last_worktime)
	didletime=(idletime-last_idletime)
	rate=float(dworktime)/(didletime+dworktime)
	last_worktime=worktime
	last_idletime=idletime
	if(last_worktime==0): return 0
	return rate


while True:
	print "get_cpu()",get_cpu()
	time.sleep(0.5)

Tags:

Add new comment