ImageResizingBenchmarks.rb

require 'rubygems'
require 'rusage'
require 'pp'
require 'benchmark'
files = Dir['samples/**/*']
command = case ARGV[0]
  when 'gd2'
      require 'gd2'
      lambda do |file|
        GD2::Image.import(file).resize(128, 128).export('/dev/null', :format => :jpeg)
      end
  when 'image_science'
      require 'image_science'
      lambda do |file|
        ImageScience.with_image(file) do |img|
          img.thumbnail(128) do |resized|
            resized.save('/dev/null')
          end
        end
      end
  when 'mini_magick'
      require 'mini_magick'
      lambda do |file|
        image = MiniMagick::Image.from_file(file)
        image.resize('128x128')
        image.write('/dev/null')
      end
  end
memory_record = [Process.rusage.maxrss]
time = Benchmark.measure do
  files.each_with_index do |file, i|
    command.call(file)
    memory_record << Process.rusage.maxrss if i % 20 == 0
  end
end
puts "Time: #{time}"
puts "Memory: #{memory_record.join(', ')}"