From: Dave Thomas <Dave@...>
Date: 2001-01-17T07:36:29+09:00
Subject: [ruby-talk:9399] Re: Spiffy timing method anyone?

Jim Freeze <jim@freeze.org> writes:

> I noticed that the Time class supports microsecionds. I am interested in
> how Rubyites perform timing sutdies on blocks of code.

Goto-san's 'benchmark' library is your friend.

For full benchmarks, you can do things like

  require 'benchmark'
  include Benchmark

  bm(10) do |tester|

    tester.report("times") { 100000.times   {|i| i+i } }
    tester.report("upto")  { 1.upto(100000) {|i| i+i } }

  end

which produces:

                  user     system      total        real
  times       0.240000   0.000000   0.240000 (  0.245942)
  upto        0.250000   0.000000   0.250000 (  0.247145)


For one-off timings, there's also

  require 'benchmark'
  include Benchmark

  timing = measure { 100000.times {|i| i+i } }

  p timing.to_a   #=> ["", 0.27, 0.0, 0.0, 0.0, 0.2487230301]


Regards


Dave