From: Gyoung-Yoon Noh <nohmad@...>
Date: 2005-06-10T08:27:33+09:00
Subject: Re: python/ruby benchmark.

On 6/10/05, Ara.T.Howard <Ara.T.Howard@noaa.gov> wrote:
> 
> hmmm.  since set uses hash yet has at least another level of method calls
> that's hard to believe... this is what i'm getting:
> 
>    harp:~ > ruby a.rb
>    ========< set >========
>    3.818156
> 
>    ========< hash >========
>    2.572087
> 
> 
>    harp:~ > ruby a.rb
>    ========< set >========
>    3.824544
> 
>    ========< hash >========
>    2.600603
> 
> 
>    harp:~ > cat a.rb
>    require 'set'
> 
>    def bench label
>      fork {
>        GC.disable
>        STDOUT.sync = true
>        puts "========< #{ label } >========"
>        a = Time::now.to_f
>        yield
>        b = Time::now.to_f
>        printf "%f\n", b - a
>        puts
>      }
>      Process::wait
>    end
> 
>    words = IO::readlines('/usr/share/dict/words').map{|word| word.strip}
> 
>    set = Set::new
>    hash = Hash::new
> 
>    words.each{|word| set << hash[word] = word}
> 
>    bench('set'){ 42.times{ words.each{|word| set.include? word}}}
>    bench('hash'){ 42.times{ words.each{|word| hash.has_key? word}}}
> 
> 
> note that times are the time it takes to look up every single word in the list
> 42 times.
> 

Oops, I posted absolute stupidity without any context information.
Actually, I've been looking into some cases in which ruby is
irrationally slow, so 'spellcheck' code come from at that time.
See http://shootout.alioth.debian.org/benchmark.php?test=spellcheck&lang=ruby&id=0&sort=fullcpu

Anyway, Ara, I got a similar result as you'd presented. Have you
tested my code? I doubt 'set' prevails in constructing large data
set compared to Hash. In case of 'spellcheck', it seems that the
bench would be performed iterative execution of the code.
If then, I guess 'set' version probably wins.

Sorry for posting without any mention about specific context.

Regards,

-- 
http://nohmad.sub-port.net