gistfile1.txt

require 'benchmark'

class A

 def initialize
    @yo_block_1 = proc {|n| n * 2}
 end

def go &block
  yield (3)
end

 def go_non_named
  yield(3)
 end

 def yo
   @yo_block_1 ||= proc {|n| n * 2}
   go &@yo_block_1
 end
 
 def yo_slow
  go {|n| n * 2}
 end
 
 def yo_yield
   go_non_named { |n| n * 2}
 end
end

b = A.new
n = 1
n = 3 if RUBY_PLATFORM =~ /java/
 
n.times {
 puts Benchmark.realtime { 1000000.times { b.yo_yield }}
 puts Benchmark.realtime { 1000000.times { b.yo }}
 puts Benchmark.realtime { 1000000.times { b.yo_slow }}
}

gistfile2.txt

E:\dev\digitalarchive_trunk.trunk>e:\dev\ruby\downloads\jruby\bin\jruby.EXE --server --fast speed_test.rb
...
0.421000003814697 # yield
0.421999931335449 # cached
0.672000169754028 # named

1.9.1:

0.40625  # yield
0.609375 # cached
5.546875 # named