From: "ara.t.howard" <ara.t.howard@...>
Date: 2008-09-02T09:15:09+09:00
Subject: Re: generate uuid


On Sep 1, 2008, at 5:38 PM, Ryan Davis wrote:

>
> On Sep 1, 2008, at 14:48 , James Gray wrote:
>
>> My favorite trick is:
>>
>> uuid = `uuidgen`.strip
>>
>> It has always been fast enough for my needs.
>
> that's nice. 10k real uuids in 1 minute is perfectly acceptable for  
> almost all cases. thanks.
>
> % ./blah.rb 10000
> # of iterations = 10000
>                          user     system      total        real
> null_time             0.000000   0.000000   0.000000 (  0.001486)
> ezra                  0.200000   0.000000   0.200000 (  0.201678)
> uuidgen               1.160000  12.630000  58.190000 ( 56.684045)
>
> ----
>
> puts "# of iterations = #{max}"
> Benchmark::bm(20) do |x|
>  x.report("null_time") do
>    for i in 0..max do
>      # do nothing
>    end
>  end
>
>  x.report("ezra") do
>    for i in 0..max do
>      fast_token
>    end
>  end
>
>  x.report("uuidgen") do
>    for i in 0..max do
>      `uuidgen`.strip
>    end
>  end
> end
>
>


cfp:~ > cat a.rb
require 'open-uri'

uri = 'http://s3.amazonaws.com/drawohara.com.ruby/uuid.rb'

eval open(uri).read

a = Time.now.to_f

( n = 1000 ).times{ uuid = UUID.string }

b = Time.now.to_f

elapsed = b - a

puts "uuid/min : #{ n / elapsed * 60 }"



cfp:~ > ruby a.rb
uuid/min : 113947.784509223



it's kinda a POS, but with the addition of macaddr and a few other  
tidbits (state using AR for instance) it's pretty dang good : 10 times  
faster and pure ruby.






a @ http://codeforpeople.com/
--
we can deny everything, except that we have the possibility of being  
better. simply reflect on that.
h.h. the 14th dalai lama