read.rb

file = ARGV[0]
2.times do
  lines, bytes = 0,0
  start = Time.now
  contents = File.open(file){ |f| f.read }
  contents.scan(/.+/) do |line|
    lines += 1
    bytes += line.size
  end
  elapsed = Time.now-start
  mb = bytes.to_f / 2**20
  puts "File.open(...) read %d lines & %0.1fMB in %0.3fs (%d lines/sec, %0.1fMB/sec)" % [
    lines, mb, elapsed, lines/elapsed, mb/elapsed
  ]
end