benchmark.rb

#!/usr/bin/env ruby

require 'benchmark'
require 'yaml'

commands = File.open(ARGV[0], 'r') do |file|
  file.readlines
end.map(&:strip)

results = []
commands.each_with_index do |cmd, index|
  times = Benchmark.measure(cmd) do 
    pid = Kernel.spawn(cmd, :out=>"/dev/null")
    Process.wait pid
  end
  results << times
  File.open(ARGV[1], 'w') do |out|
    YAML.dump(results, out)
  end
  puts "%4d/%d" % [index, commands.length]
end