gistfile1.rb

require 'benchmark'

def direct
end

def simple
  direct
end

def stupid
  def foo; end
  foo
end

Benchmark.bmbm do |x|
  n = 1_000_000
  x.report 'direct' do n.times{direct} end
  x.report 'simple' do n.times{simple} end
  x.report 'stupid' do n.times{stupid} end
end

#              user     system      total        real
# direct   0.200000   0.000000   0.200000 (  0.205748)
# simple   0.290000   0.000000   0.290000 (  0.288481)
# stupid   2.140000   0.100000   2.240000 (  2.238356)