From: Reid Thompson <reid.thompson@...>
Date: 2012-02-03T13:10:14+09:00
Subject: Re: Basic Ruby performance

On 2/2/2012 5:20 PM, Dmitry Nikiforov wrote:
> Hello all!
>
> First, I should point out that I'm new to Ruby, although it seems pretty
> similar in some regards to JavaScript and Perl.
>
> Anyway, I'm not sure if it's normal, or if it's specifics of Ruby on Mac
> OS X, or if I haven't compiled it properly (although I used rvm to
> install on my OS X Lion, to have the latest version - Lion comes with
> 1.8.7 by default, I believe, so I installed 1.9.3), but most things I
> try to replicate with it that I used Perl to do before run about twice
> slower. So I ran some basic benchmarks. Here's one example:
>
> Ruby:
>
> for a in 0..1E8
>          a*2
> end
>
> Perl:
>
> for $a ( 0..1E8 ) {
>          a*2
> }
>
> Ruby takes 22 seconds, Perl - 9 seconds to execute this. This is very
> similar to all other scenarios I tried (one of which is splitting
> millions of comma separated rows into arrays).
>
> I would really appreciate any useful suggestions: I would LOVE to be
> able to use Ruby for most of the stuff I do (it's not that I don't like
> Perl, but I love Ruby's syntax :) )
>
> Thanks!
>
$ cat mult.rb
#for a in 0..100000000
#        a*2
#end
require 'rubygems'
require 'inline'

class Multiply
inline do |builder|
builder.c "
        long mult(int max) {
        long ctr = 0;
        unsigned long long  result;
        while (ctr < max){ result = (ctr++ * 2);}
        return result;
        }"
end
end

#

puts ARGV[0]
m = Multiply.new()
start_time = Time.now
a = m.mult(ARGV[0].to_i)
puts a.to_s
end_time = Time.now
duration = ((end_time.to_f - start_time.to_f) * 1000.0).to_i
puts "You took " + duration.to_s + " seconds."


my linux box
model name      : Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz   quad core
$ ruby -v
ruby 1.8.7 (2011-12-28 patchlevel 357) [x86_64-linux]

[23:05:57] rthompso@raker2>~
$ time ruby mult.rb 999999991
999999991
1999999980
You took 0 seconds.

real    0m0.059s
user    0m0.050s
sys     0m0.008s


my windows xp laptop using cygwin ruby
T7100 @ 1.80GHZ  dual core
Reid.Thompson@lt-lat-4960 ~
$ ruby -v
ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-cygwin]

Reid.Thompson@lt-lat-4960 ~
$ time ruby rbtest.rb 999999991
999999991
1999999980
You took 0 seconds.

real    0m0.303s
user    0m0.109s
sys     0m0.170s