import subprocess, sys
from time import time

RUNS = 5
LOOPS = 100
ARGS = [sys.executable, '-c', 'pass']

def bench():
    best = None
    for run in range(RUNS):
        print("%s/%s" % (1+run, RUNS))
        a = time()
        for loop in range(LOOPS):
            subprocess.call(ARGS)
        b = time()
        dt = float(b - a) / LOOPS
        if best is not None:
            best = min(best, dt)
        else:
            best = dt
    return best

t = bench()
print("Best startup: %.1f ms" % (t * 1000.))