from __future__ import division
import sys, os, time

def getCpuTimes():
    cpu0 = 0
    cpu1 = 1
    for line in open("/proc/stat"):
        tokens = line.split()
        if tokens[0] == "cpu0":
            cpu0 = int(tokens[1]) + int(tokens[3])
        elif tokens[0] == "cpu1":
            cpu1 = int(tokens[1]) + int(tokens[3])
    return cpu0, cpu1

def measureCpuImbalance(workload):
    baseline = getCpuTimes()
    workload()
    final = getCpuTimes()
    return (final[0] - baseline[0]) / (final[1] - baseline[1])

def myWorkload():
    pid = os.spawnl(os.P_NOWAIT, "./priosched")
    time.sleep(0.5)
    os.kill(pid, 9)
    os.wait()

while True:
    print "%.04f" % measureCpuImbalance(myWorkload)