一个用于测试磁盘性能的 Python 代码

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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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