From: Greg Brondo <greg@...>
Date: 2003-04-03T00:51:28+09:00
Subject: Re: Newbie question:read file speed

Here they are:

------- RUBY ------
filename = ARGV[0]

lc = 0
starttime = Time.now.to_f
File.open(filename).each_line do
 lc += 1
 if lc % 1000 == 0
  puts "Read #{lc} lines"
 end
end
stoptime = Time.now.to_f

puts "Elapsed = " + (stoptime - starttime).to_s
----------------------------------------------

------ PYTHON ------
import sys, time

filename = sys.argv[1]

fh = open(filename,'r')

lc = 0
starttime = time.time()
for line in fh:
 lc += 1
 if lc % 1000 == 0:
  print "Read %d lines" % lc

fh.close()
stoptime = time.time()
print "Elapsed = %d" % (stoptime - starttime
-----------------------------------------------------

------ JAVA ------
import java.util.*;
import java.io.*;

class Test {
 public static void main(String[] args) {
 try {
  BufferedReader in = new BufferedReader(new FileReader(args[0]));
  int lc = 0;
  String line;
  long starttime = System.currentTimeMillis() / 1000;
  while ( (line = in.readLine()) != null ) {
   lc += 1;
   if ( (lc % 1000) == 0 ) {
    System.out.println("Read " + lc + " lines");
   }
  }
  in.close();
  long stoptime = System.currentTimeMillis() / 1000;
  System.out.println("Elapsed = " + (stoptime - starttime));
 } catch (Exception e) {
  e.printStackTrace();
 }
 }
-------------------------------------------------

The stats for reading a text file with 1,572,000 lines in an CMD.EXE console
(on a PIII 866 w 512MB):
RUBY (1.8p2):  13.5 sec
PYTHON (2.3b2):  4 sec
JAVA (1.4.1):  7 sec


Thanks for the help!!!

Greg B.


"Brian Candler" <B.Candler@pobox.com> wrote in message
news:20030402110858.C19790@linnet.org...
> On Wed, Apr 02, 2003 at 07:28:20AM +0900, Greg Brondo wrote:
> > Why is ruby (on windows) so much slower at reading lines in a file (as
> > compared to perl, python or java) ?  I've installed 1.8 preview 2 and
it's
> > much faster but still not nearly as fast as the other languages
mentioned.
>
> Can you post the exact programs that you are timing in each language?
>
> Regards,
>
> Brian.
>