bench.rb

# bench() - (C) 2010 [email protected] - MIT License
#
# Useful bench() routine for your .irbrc
#
# Usage:
#
# bench { some code }
# 1000 iterations: 1.205242 (0.000121 per iteration)
# bench(4939) { some code }
# 4939 iterations: 1.420919 (0.000288 per iteration)
#

module Kernel
  def bench(n = 1000, &block)
    raise ArgumentError, 'What should I benchmark?' unless block

    require 'benchmark'
    print "#{n} iterations: "
    time = Benchmark.measure { n.times(&block) }.real
    puts "%.06f (%.06f per iteration)" % [time, time / n]
  rescue LoadError
    puts "Benchmark is not available in this session"
  end
end