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# -*- coding: utf-8 -*-
require 'benchmark'

Benchmark.bm(10) do |x|

  if (Kernel.const_defined?(:MACRUBY_VERSION))
    str_utf16 = "abcdefg0123456789\n".force_encoding('UTF-16LE') * 10000
    x.report "UTF-16" do
      str_utf16.split("\n".force_encoding('UTF-16LE'))
    end
  end

  str_utf8 = "abcdefg0123456789\n" * 10000
  x.report "UTF-8" do
    str_utf8.split("\n")
  end
end

$ macruby bm_split.rb
                user     system      total        real
UTF-16      0.000000   0.000000   0.000000 (  0.001054)
UTF-8       0.010000   0.010000   0.020000 (  0.010342)

$ ruby19 bm_split.rb 
                user     system      total        real
UTF-8       0.010000   0.000000   0.010000 (  0.001824)