Benchmark arbitrary command n times

mini_bench.py

#!/usr/bin/env python
import subprocess
import sys
import time

def avg(nums):
    return sum(nums) / len(nums)

def main():
    if len(sys.argv) < 3:
        print "Usage: mini_bench N arg1 arg2"
        return

    n = int(sys.argv[1])
    cmd = sys.argv[2:]

    times = []

    for i in range(n):
        t0 = time.time()
        ret = subprocess.call(cmd)
        assert ret == 0
        times.append(time.time() - t0)

    print "Called the command %d times" % n
    print "Average time : %f" % avg(times)
    print "Best time : %f" % min(times)
    print "Worst time : %f" % max(times)

if __name__ == "__main__":
    main()