From: Robert Klemme <shortcutter@...>
Date: 2010-02-06T22:45:05+09:00
Subject: Re: Bug: Ruby 1.9.1 File io on Windows is slooooow

On 02/05/2010 10:53 PM, Ad Gr wrote:
> Roger Pack wrote:
>>> ruby 1.9.1p0 (2009-01-30 revision 21907) [i386-mswin32]
>>> "2 40.188834"
>>>
>>> ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]
>>> "2 0.087"
>>>
>>> That is about 5x slower write and 500x read operation. Times are the
>>> same if I do:
>>> f = File.new('out.file','r')
>>> c = f.read
>>> f.close
>>> P.S.
>>> Where can I officaly report a Ruby bug?
>> Looks like this bug is http://redmine.ruby-lang.org/issues/show/1332
>> Can you try with mode 'rb' and is it fast then?
>> -r
> 
> Also this one is much much slower on ruby 1.9 then on ruby 1.8:
> Tested on Windows XP. No virus scanner.
> 
> time = [Time.new]
> n = 1000
> lines = []
> (1..n).each { |nr| lines << "line" }
> 
> time << Time.new
> File.open('out2.file','w') { |f|
>   lines.each { |l|
>     f.print(l)
>     f.flush
>   }
> }
> time << Time.new
> 
> txt = ['construct','write','read']
> 0.upto(time.size - 2) {|i| p "#{txt[i]} #{time[i+1]-time[i]}" }
> 
> 
> #ruby 1.9
> #"construct 0.0"
> #"write 22.453125"
> 
> #ruby 1.8
> #"construct 0.0"
> #"write 0.015"

How many test runs did you do?  Because of caching figures from a single 
run are usually not very telling.

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/