benchmark_io.rb

TEST_INPUT_PATH = '/Users/joho/Desktop/Grand Designs S09E10.avi'
TIMES_TO_TEST = 10

start = Time.now
TIMES_TO_TEST.times do
  puts "start"
  File.open 'test.avi', 'w' do |out_file|
    File.open TEST_INPUT_PATH, 'r' do |in_file|
      out_file.write in_file.read
    end
  end
  `rm test.avi`
end
puts Time.now - start

start = Time.now
TIMES_TO_TEST.times do
  puts "start 2"
  File.open 'test2.avi', 'w' do |out_file|
    File.open TEST_INPUT_PATH, 'r' do |in_file|
      while out_file.syswrite((in_file.sysread(16_384) rescue nil) > 0
      end
    end
  end
  `rm test2.avi`
end
puts Time.now - start