rbx 3.19 ~7.7x vs mri 2.2.3

bm_while.rb

require 'benchmark/ips'


def script
	i = 0
	while i < 1000_000
		i += 1
	end
	i
end

Benchmark.ips do |x|
  x.report 'while', %{ script }
end

mri.txt

$ ruby -v bm_while.rb
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin15]
Warming up --------------------------------------
               while     4.000  i/100ms
Calculating -------------------------------------
               while     40.641  (± 4.9%) i/s -    204.000  in   5.031193s

rbx.txt

$ rbx -v bm_while.rb
rubinius 3.19 (2.2.2 1cc41ddc 2016-02-27 3.5.1 JI) [x86_64-darwin13.4.0]
Warming up --------------------------------------
               while    29.000  i/100ms
Calculating -------------------------------------
               while    315.140  (± 5.7%) i/s -      1.595k