From: "Iñaki Baz Castillo" <ibc@...>
Date: 2011-08-07T21:45:55+09:00
Subject: Methods defined with module_eval are... faster?

Hi, just let me show this code:

-------------------
require "benchmark"


module M
  self.module_eval("
    def self.kk(var)
      if var == 123
        a=var*2
      else
        a=var*4
      end
    end
")

  def self.aa(var)
    if var == 123
      b=var*2
    else
      b=var*4
    end
  end
end


printf "M.kk: "
puts Benchmark.realtime { 4000000.times { M.kk(123) ; M.kk(4) } }
printf "M.aa: "
puts Benchmark.realtime { 4000000.times { M.aa(123) ; M.aa(4) } }
printf "M.kk: "
puts Benchmark.realtime { 4000000.times { M.kk(123) ; M.kk(4) } }
printf "M.aa: "
puts Benchmark.realtime { 4000000.times { M.aa(123) ; M.aa(4) } }
-------------------


Results (ruby 1.9.2):

M.kk: 1.4799699783325195
M.aa: 1.6037561893463135
M.kk: 1.4918322563171387
M.aa: 1.612684965133667


This is, M.kk (defined with module_eval) is faster than M.aa (which is
a commonly defined method). ¿?¿?


-- 
Iñaki Baz Castillo
<ibc@aliax.net>