import mmap
import time


FILE = '/tmp/spam'
BLOCKS = 10000
LEN = 1000

# create file
data = 'x' * LEN
f = open(FILE, 'w+')
for b in range(BLOCKS):
    f.write(data)
f.flush()

t = time.time()
# mmap it, and write to memory
for i in range(10):
    m = mmap.mmap(f.fileno(), 0)
    for b in range(BLOCKS):
        m.write(data)
    #m.flush()
    m.close()
print(time.time() - t)

f.close()