ifs.rb

require "thread"
require "benchmark"

COUNT = 50000000

@m1 = @m2 = @m3 = @m4  = @m5 = @m6 = @m7 = @m8 = @m9 = @m10 = @m11 = @m12 = nil
@m4 = "foo"
@m8 = "bar"

@calls = 0

def m1(i)
  @calls += i
end

def m2(i)
  @calls += i
end

def m3(i)
  @calls += i
end

def m4(i)
  @calls += i
end

def m5(i)
  @calls += i
end

def m6(i)
  @calls += i
end

def m7(i)
  @calls += i
end

def m8(i)
  @calls += i
end

def m9(i)
  @calls += i
end

def m10(i)
  @calls += i
end

def m11(i)
  @calls += i
end

def m12(i)
  @calls += i
end


ms = [method(:m4), method(:m8)]
Benchmark.bmbm(40) do |bm|
  bm.report("loop do") do
    @calls = 0
    COUNT.times.each do
      ms.each do |m|
        m.call(1)
      end
    end
  end
end
puts("calls=#{@calls}")


Benchmark.bmbm(40) do |bm|
  bm.report("if") do
    @calls = 0
    COUNT.times.each do
      m1(1) if @m1
      m2(1) if @m2
      m3(1) if @m3
      m4(1) if @m4
      m5(1) if @m5
      m6(1) if @m6
      m7(1) if @m7
      m8(1) if @m8
      m9(1) if @m9
      m10(1) if @m10
      m11(1) if @m11
      m12(1) if @m12
    end
  end
end
puts("calls=#{@calls}")

output.txt

Rehearsal ----------------------------------------------------------------------------
loop do                                    9.630000   0.170000   9.800000 (  9.902000)
------------------------------------------------------------------- total: 9.800000sec

                                               user     system      total        real
loop do                                    8.580000   0.040000   8.620000 (  8.716000)
calls=100000000
Rehearsal ----------------------------------------------------------------------------
if                                         7.300000   0.030000   7.330000 (  7.231000)
------------------------------------------------------------------- total: 7.330000sec

                                               user     system      total        real
if                                         7.030000   0.020000   7.050000 (  7.158000)
calls=100000000