file_lines.rb

puts 'Press a key to begin...'; gets

n = 3
fname = File.expand_path(File.join(File.dirname(__FILE__), '..', 'input/lesmiserables.txt'))

Benchmark.bmbm do |bm|
  bm.report 'Big file each_line:' do
    n.times do
      count = 0
      File.open(fname, 'r').each_line do |line|
        #count += 1
      end
    end
  end
end

gistfile2.txt

C:\Users\Jon\Documents\RubyDev\measurements-git\workloads>ruby -rbenchmark -v file_lines.rb
ruby 1.9.3dev (2011-01-29 trunk 30716) [i386-mingw32]
Press a key to begin...

Rehearsal -------------------------------------------------------
Big file each_line:   1.872000   0.016000   1.888000 (  1.906109)
---------------------------------------------- total: 1.888000sec

                          user     system      total        real
Big file each_line:   1.903000   0.000000   1.903000 (  1.905109)


C:\Users\Jon\Documents\RubyDev\measurements-git\workloads>ruby -rbenchmark -v file_lines.rb
ruby 1.8.7 (2010-12-23 patchlevel 330) [i386-mingw32]
Press a key to begin...

Rehearsal -------------------------------------------------------
Big file each_line:   0.234000   0.015000   0.249000 (  0.237014)
---------------------------------------------- total: 0.249000sec

                          user     system      total        real
Big file each_line:   0.172000   0.063000   0.235000 (  0.235014)