fuuu.rb

class Sloppy
  def sloppy; @sloppy; end
end

class Tidy
  def initialize; @tidy = nil; end
  def tidy;       @tidy; end
end

require 'benchmark'

GC.disable

tidy   = Tidy.new
sloppy = Sloppy.new

[ 1, 10, 100, 10_000, 100_000_000 ].each do |n|
  puts "N: #{n}"
  Benchmark.bm(7) do |x|
    x.report('tidy') {
      n.times { tidy.tidy }
    }
    x.report('sloppy') {
      n.times { sloppy.sloppy }
    }
  end
  puts
end
__END__
[aaron@higgins git]$ ruby -v
ruby 1.9.4dev (2011-08-25 trunk 33052) [x86_64-darwin11.1.0]
[aaron@higgins git]$ ruby fuuu.rb
N: 1
              user     system      total        real
tidy      0.000000   0.000000   0.000000 (  0.000016)
sloppy    0.000000   0.000000   0.000000 (  0.000006)

N: 10
              user     system      total        real
tidy      0.000000   0.000000   0.000000 (  0.000008)
sloppy    0.000000   0.000000   0.000000 (  0.000009)

N: 100
              user     system      total        real
tidy      0.000000   0.000000   0.000000 (  0.000040)
sloppy    0.000000   0.000000   0.000000 (  0.000039)

N: 10000
              user     system      total        real
tidy      0.000000   0.000000   0.000000 (  0.003054)
sloppy    0.000000   0.000000   0.000000 (  0.003969)

N: 100000000
              user     system      total        real
tidy     29.880000   0.030000  29.910000 ( 30.232715)
sloppy   35.030000   0.040000  35.070000 ( 35.505067)

[aaron@higgins git]$ ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin11.0]
[aaron@higgins git]$ ruby fuuu.rb 
N: 1
             user     system      total        real
tidy     0.000000   0.000000   0.000000 (  0.000239)
sloppy   0.000000   0.000000   0.000000 (  0.000007)

N: 10
             user     system      total        real
tidy     0.000000   0.000000   0.000000 (  0.000012)
sloppy   0.000000   0.000000   0.000000 (  0.000010)

N: 100
             user     system      total        real
tidy     0.000000   0.000000   0.000000 (  0.000177)
sloppy   0.000000   0.000000   0.000000 (  0.000172)

N: 10000
             user     system      total        real
tidy     0.000000   0.000000   0.000000 (  0.003899)
sloppy   0.010000   0.000000   0.010000 (  0.004534)

N: 100000000
             user     system      total        real
tidy    40.210000   0.050000  40.260000 ( 41.566687)
sloppy  40.110000   0.050000  40.160000 ( 40.921818)

[aaron@higgins git]$ ruby -v
jruby 1.6.3 (ruby-1.8.7-p330) (2011-07-07 965162f) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_26) [darwin-x86_64-java]
[aaron@higgins git]$ ruby fuuu.rb 
fuuu.rb:1 warning: GC.disable does nothing on JRuby
N: 1
             user     system      total        real
tidy     0.084000   0.000000   0.084000 (  0.017000)
sloppy   0.002000   0.000000   0.002000 (  0.002000)

N: 10
             user     system      total        real
tidy     0.000000   0.000000   0.000000 (  0.000000)
sloppy   0.000000   0.000000   0.000000 (  0.000000)

N: 100
             user     system      total        real
tidy     0.000000   0.000000   0.000000 (  0.000000)
sloppy   0.001000   0.000000   0.001000 (  0.001000)

N: 10000
             user     system      total        real
tidy     0.078000   0.000000   0.078000 (  0.078000)
sloppy   0.051000   0.000000   0.051000 (  0.051000)

N: 100000000
             user     system      total        real
tidy     8.361000   0.000000   8.361000 (  8.362000)
sloppy   8.997000   0.000000   8.997000 (  8.997000)

[aaron@higgins git]$ rbx -v
rubinius 1.2.5dev (1.8.7 3790ba50 yyyy-mm-dd JI) [x86_64-apple-darwin11.1.0]
[aaron@higgins git]$ rbx fuuu.rb
N: 1
             user     system      total        real
tidy     0.000181   0.000012   0.000193 (  0.000026)
sloppy   0.000020   0.000003   0.000023 (  0.000018)

N: 10
             user     system      total        real
tidy     0.000013   0.000009   0.000022 (  0.000012)
sloppy   0.000013   0.000002   0.000015 (  0.000011)

N: 100
             user     system      total        real
tidy     0.000044   0.000008   0.000052 (  0.000106)
sloppy   0.000037   0.000002   0.000039 (  0.000182)

N: 10000
             user     system      total        real
tidy     0.002764   0.000013   0.002777 (  0.002826)
sloppy   0.008063   0.000101   0.008164 (  0.006082)

N: 100000000
             user     system      total        real
tidy    13.934830   0.017758  13.952588 ( 14.151206)
sloppy   9.565299   0.005134   9.570433 (  9.594408)