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#!/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)
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