getter_benchmark.rb

getter_benchmark.rb

class Foo1
  FOO = 3
end

class Foo2
  def self.foo
    3
  end
end

time_start = Time.now
10000000.times{Foo1::FOO}
time_1 = Time.now
10000000.times{Foo2.foo}
time_2 = Time.now

puts "Constant: #{time_1 - time_start}"
puts "Class method: #{time_2 - time_1}"

jruby result

bbozo@uhurajr-ubuntu:~/dev$ ruby getter.rb
Constant: 0.947
Class method: 0.495
bbozo@uhurajr-ubuntu:~/dev$ ruby getter.rb
Constant: 0.617
Class method: 0.505
bbozo@uhurajr-ubuntu:~/dev$ ruby getter.rb
Constant: 0.829
Class method: 0.552

mri ruby result

bbozo@uhurajr-ubuntu:~/dev$ ruby getter.rb
Constant: 0.775749431
Class method: 1.081718486
bbozo@uhurajr-ubuntu:~/dev$ ruby getter.rb
Constant: 0.748656884
Class method: 1.117390897
bbozo@uhurajr-ubuntu:~/dev$ ruby getter.rb
Constant: 0.74989894
Class method: 1.05571574