From: Ryan Davis <ryand-ruby@...>
Date: 2008-09-02T08:38:03+09:00
Subject: Re: generate uuid


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