benchmark.rb

#!/usr/bin/env ruby
#
# NIEC BENCHMARKER:
#
# == Usage
#
# 1. Create a ruby source file containing methods with arbitrary names.
#    Those are the methods that will be benchmarked.
#    For example, contents of my-benchmarks.rb:
#
#    def do_stuff; 123; end;
#    def do_other_stuff; 321; end;
#
# 2. ./benchmark.rb my-benchmarks.rb
#
#                         user     system      total        real
#    do_stuff        0.040000   0.000000   0.040000 (  0.043305)
#    do_other_stuff  0.040000   0.000000   0.040000 (  0.043316)
#

require 'benchmark'

unless ARGV[0].match(/\.rb/)
  puts "error: no source file given"
  exit
end

path = ARGV[0]
file = File.read(path)
tmp  = Object.private_methods
n    = (ARGV.grep(/^\d+$/)[0] || 100000).to_i

eval(file)

bm_methods = Object.private_methods - tmp

Benchmark.bm(bm_methods.map(&:size).max) do |x|
  bm_methods.each do |m|
    x.report(m.to_s) { n.times { Object.send(m) } }
  end
end