zlib and gil

zlib_thread.py

from zlib import compress, decompress
from time import time
import threading

import random
import string

#DAT = ''.join(random.choice(string.letters) for _ in xrange(8*1024))
DAT = 'hello'
#DAT = compress(DAT)
#print "compressed size:", len(DAT)


flag = threading.Event()

def worker():
    D=DAT
    #dec = decompress
    dec = compress
    flag.wait()
    for i in xrange(10000):
        dec(D)

flag.set()
t = time()
worker()
t = time()-t
print "Single thread:", t*1000, "[ms]"

flag.clear()
t1=threading.Thread(target=worker)
t2=threading.Thread(target=worker)
t1.start()
t2.start()

t = time()
flag.set()
t1.join()
t2.join()
t = time()-t
print "Double thread:", t*1000, "[ms]"