io_seek_test.py

import sys, itertools, time

# Use the following command to flush: echo 1 > /proc/sys/vm/drop_caches

if len(sys.argv) < 2:
    print "Usage: %s <portion_mb> file1 file2 ..."
    exit(-1)

portion = int(sys.argv[1]) * 2**20
files = sys.argv[2:]
handles = map(lambda t: open(t, "r"), files)

t = time.time()
for fn, fh in itertools.cycle(zip(files, handles)):
    print "Reading %s (time = %f)" % (fn, time.time() - t)
    t = time.time()
    chunk = fh.read(portion)
    if len(chunk) == 0: break