From: Ron Jeffries <ronjeffries@...>
Date: 2002-03-08T05:18:56+09:00
Subject: Re: file reading impossibly slow?

On Thu, 07 Mar 2002 16:36:22 GMT, Peter Hickman <peter@semantico.com> wrote:

>Ron Jeffries wrote:
>
>>Actually, if anything, it is slower. Very interesting ...
>>
>Odd. Here's my test.
>
>#!ruby
>
>require 'tempfile'
>
>tf = Tempfile.new("data.txt")
>(1..1000000).each {|i| tf.print "Here is a line of text\n" }
>tf.close
>
>tf.open
>t1 = Time.now
>tf.each_line {|line|}
>puts Time.now - t1
>tf.close
>
>tf.open
>t1 = Time.now
>while(!tf.eof?)
>        line = tf.gets
>end
>puts Time.now - t1
>tf.close
>
>My times are
>7.86 and 29.99 on a 500Hz Celeron using Cygwin under Win9,
>ruby 1.6.5, and 3.599269 and 9.272985 on my Linux, ruby 1.6.4,
>machine which I don't know the spec of. But the ballance
>remains the same. My code should have been faster.
>

My times this time are
134.423 each_line
167.411 gets
on a 600 MHz who knows what Toshiba, running win 2000 without cygwin, Ruby
1.6.6, Andy's Windows build.

Last time it was slower in each_line but maybe I was doing something else also.

My file is about 20x larger in size, and 6x larger in line count. I was running
(roughly)  20 times slower than these figures. So that hangs together sort of
OK.

It really looks like I should be running Linux, doesn't it? But I suppose
everyone knew that. I just don't know that I have the patience ...

I guess until I figure out whether I can run 1.7, these figures are pretty
solid. Smalltalk just goes faster, that's all. I'll run this test on it sometime
when I get a chance, just for another comparison.

Thanks ...

Ronald E Jeffries
http://www.XProgramming.com
http://www.objectmentor.com
I'm giving the best advice I have. You get to decide whether it's true for you.