benchmark.rb

# benchmarking.rb - Josh Sandlin - 1:58PM - 1/24/2010
# benchmarking from the unofficial ruby usage guide

require 'benchmark'
include Benchmark

n = 1000000
bm( 12 ) do |test|
  test.report( "normal:" ) do
    n.times do |x|
      y = x + 1
    end
  end
  test.report( "predefine:" ) do
    x = y = 0
    n.times do |x|
      y = x + 1
    end
  end
end

# ruby benchmarking.rb
#                   user     system      total        real
# normal:       0.546000   0.000000   0.546000 (  0.556000)
# predefine:    0.468000   0.000000   0.468000 (  0.464000)

# jruby benchmarking.rb
#                   user     system      total        real
# normal:       0.508000   0.000000   0.508000 (  0.335000)
# predefine:    0.282000   0.000000   0.282000 (  0.282000)