from queue import Queue
from threading import Thread
from time import clock
from math import sqrt

n = 10000
results = []

q = Queue()

def servant():
    while True:
        v = q.get()
        t = clock()
        if v is None:
            break
        results.append(t - v)


def master():
    for i in range(n):
        q.put(clock())
    q.put(None)


t = Thread(target=servant)
t.start()
t0 = clock()
master()
t.join()
t1 = clock()

avg = sum(results)/n
sq = [(i-avg)**2 for i in results]
stddev = sqrt(sum(sq)/(n-1))
print("totaltime: %f, avg delay: %f, delay_stddev: %f"%(t1-t0, avg, stddev))