#!/usr/bin/python # -*- coding: utf-8 -*- filecount = 300000 filesize = 1024 import random, time from os import system flush = "sudo su -c 'sync ; echo 3 > /proc/sys/vm/drop_caches'" randfile = open("/dev/urandom", "r") print "\ncreate test folder:" starttime = time.time() system("rm -rf test && mkdir test") print time.time() - starttime system(flush) print "\ncreate files:" starttime = time.time() for i in xrange(filecount):     rand = randfile.read(int(filesize * 0.5 + filesize * random.random()))     outfile = open("test/" + unicode(i), "w")     outfile.write(rand) print time.time() - starttime system(flush) print "\nrewrite files:" starttime = time.time() for i in xrange(int(filecount / 10)):     rand = randfile.read(int(filesize * 0.5 + filesize * random.random()))     outfile = open("test/" + unicode(int(random.random() * filecount)), "w")     outfile.write(rand) print time.time() - starttime system(flush) print "\nread linear:" starttime = time.time() for i in xrange(int(filecount / 10)):     infile = open("test/" + unicode(i), "r")     outfile.write(infile.read()); print time.time() - starttime system(flush) print "\nread random:" starttime = time.time() outfile = open("/dev/null", "w") for i in xrange(int(filecount / 10)):     infile = open("test/" + unicode(int(random.random() * filecount)), "r")     outfile.write(infile.read()); print time.time() - starttime system(flush) print "\ndelete all files:" starttime = time.time() system("rm -rf test") print time.time() - starttime system(flush)