ruby_cheats.rb

require 'benchmark'

Benchmark.bm do |bm|
  bm.report('ruby:') do
    100000.times { 8.factorial }
  end

  bm.report('c:') do
    100000.times { CFactorial.factorial(8) }
  end
end  #http://www.rubyinside.com/advent2006/6-rubyslum.html