ruby comparison benchmark

comparison.rb

require 'benchmark'

def is_it_true?
  true
end

CONSTANT = 1
BenchTimes = 1_000_000

Benchmark.bm(20) do |bm|
  bm.report("String compare") do
    BenchTimes.times { 'string' == 'string' }
  end
  bm.report("Symbol compare") do
    BenchTimes.times { :symbol == :symbol }
  end
  bm.report("Integer compare") do
    BenchTimes.times { 42 == 42 }
  end
  bm.report("Constant int compare") do
    BenchTimes.times { CONSTANT == CONSTANT }
  end
  bm.report("method call") do
    BenchTimes.times { is_it_true? }
  end
  obj = Object.new
  bm.report("method definition") do
    BenchTimes.times do 
      def obj.new_method
        true
      end
    end
  end
end

jruby-1.6.4

                          user     system      total        real
String compare        0.253000   0.000000   0.253000 (  0.213000)
Symbol compare        0.084000   0.000000   0.084000 (  0.084000)
Integer compare       0.058000   0.000000   0.058000 (  0.058000)
Constant int compare  0.077000   0.000000   0.077000 (  0.077000)
method call           0.076000   0.000000   0.076000 (  0.076000)
method definition     4.215000   0.000000   4.215000 (  4.215000)

rbx-2.0.0pre

                          user     system      total        real
String compare        0.207485   0.001812   0.209297 (  0.261455)
Symbol compare        0.094083   0.000091   0.094174 (  0.094181)
Integer compare       0.046870   0.000082   0.046952 (  0.046964)
Constant int compare  0.059667   0.000159   0.059826 (  0.059850)
method call           0.051584   0.000072   0.051656 (  0.051685)
method definition     4.915829   0.010213   4.926042 (  4.926215)

ree-1.8.7-2011.03

                          user     system      total        real
String compare        0.330000   0.000000   0.330000 (  0.333215)
Symbol compare        0.140000   0.000000   0.140000 (  0.138651)
Integer compare       0.140000   0.000000   0.140000 (  0.143397)
Constant int compare  0.180000   0.000000   0.180000 (  0.177966)
method call           0.200000   0.000000   0.200000 (  0.195159)
method definition     2.590000   0.000000   2.590000 (  2.600206)

ruby-1.9.2-p290

                          user     system      total        real
String compare        0.290000   0.000000   0.290000 (  0.282435)
Symbol compare        0.110000   0.000000   0.110000 (  0.110358)
Integer compare       0.070000   0.000000   0.070000 (  0.073060)
Constant int compare  0.070000   0.000000   0.070000 (  0.073501)
method call           0.110000   0.000000   0.110000 (  0.108959)
method definition     2.240000   0.030000   2.270000 (  2.268168)

ruby-1.9.3-rc1

                           user     system      total        real
String compare         0.270000   0.000000   0.270000 (  0.269890)
Symbol compare         0.100000   0.000000   0.100000 (  0.103971)
Integer compare        0.070000   0.000000   0.070000 (  0.072439)
Constant int compare   0.080000   0.000000   0.080000 (  0.071468)
method call            0.100000   0.000000   0.100000 (  0.102600)
method definition      1.220000   0.110000   1.330000 (  1.334018)