Pythonディスクのパフォーマンスをテストする方法

この例では、Pythonがディスクのパフォーマンスをテストする方法について説明します.皆さんの参考にしてください.具体的には以下の通りです.
このコードは次のように動作します.
create 300000 files (512B to 1536B) with data from/dev/urandom rewrite 30000 random files and change the size read 30000 sequential files read 30000 random files delete all files sync and drop cache after every step
bench.pyコードは次のとおりです.

   #!/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 "
create test folder:" 
  
 starttime = time.time() 
  
 system("rm -rf test && mkdir test") 
  
 print time.time() - starttime 
  
 system(flush) 
  
 print "
create 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 "
rewrite 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 "
read 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 "
read 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 "
delete all files:" 
  
 starttime = time.time() 
  
 system("rm -rf test") 
  
 print time.time() - starttime 
  
 system(flush) 
 

ここで述べたことが皆さんのPythonプログラム設計に役立つことを願っています.