benchmarks for 3 different ways to dynamically invoke a closure in an instance context

closure_invocation.rb

require 'benchmark'


class DSL1
  def initialize
    @i = 1
  end

  def self.register(&block)
    @block = block
  end

  def execute(arg)
    instance_exec(arg, &self.class.block)
  end

  def self.block
    @block
  end
end

class DSL2
  def initialize
    @i = 1
    define_singleton_method(:execute, self.class.block)
  end

  def self.register(&block)
    @block = block
  end

  def self.block
    @block
  end
end

class DSL3
  def initialize
    @i = 1
  end

  def self.register(&block)
    define_method(:execute, block)
  end
end

N = 10000000

class Test1 < DSL1
  register {|arg| @i + arg}
end
Benchmark.bmbm(30) do |bm|
  bm.report("instance_exec") do
    N.times do |n|
      raise if Test1.new.execute(n) != n + 1
    end
  end
end

class Test2 < DSL2
  register {|arg| @i + arg}
end
Benchmark.bmbm(30) do |bm|
  bm.report("define_singleton_method") do
    N.times do |n|
      raise if Test2.new.execute(n) != n + 1
    end
  end
end

class Test3 < DSL3
  register {|arg| @i + arg}
end
Benchmark.bmbm(30) do |bm|
  bm.report("define_method") do
    N.times do |n|
      raise if Test3.new.execute(n) != n + 1
    end
  end
end

jruby_174_output.txt

jruby 1.7.4 (1.9.3p392) 2013-05-16 2390d3b on Java HotSpot(TM) 64-Bit Server VM 1.7.0_11-b21 [darwin-x86_64]

Rehearsal ------------------------------------------------------------------
instance_exec                   26.490000   1.200000  27.690000 ( 14.887000)
-------------------------------------------------------- total: 27.690000sec

                                     user     system      total        real
instance_exec                   22.770000   0.930000  23.700000 ( 13.362000)
Rehearsal ------------------------------------------------------------------
define_singleton_method         32.290000   0.870000  33.160000 ( 22.598000)
-------------------------------------------------------- total: 33.160000sec

                                     user     system      total        real
define_singleton_method         30.920000   0.970000  31.890000 ( 21.751000)
Rehearsal ------------------------------------------------------------------
define_method                    2.510000   0.020000   2.530000 (  2.361000)
--------------------------------------------------------- total: 2.530000sec

                                     user     system      total        real
define_method                    2.200000   0.000000   2.200000 (  2.171000)

mri_200p195_output.txt

ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin12.4.0]

Rehearsal ------------------------------------------------------------------
instance_exec                   15.410000   0.400000  15.810000 ( 15.924930)
-------------------------------------------------------- total: 15.810000sec

                                     user     system      total        real
instance_exec                   15.500000   0.410000  15.910000 ( 16.045161)
Rehearsal ------------------------------------------------------------------
define_singleton_method         27.170000   0.930000  28.100000 ( 28.352451)
-------------------------------------------------------- total: 28.100000sec

                                     user     system      total        real
define_singleton_method         27.860000   0.950000  28.810000 ( 29.072435)
Rehearsal ------------------------------------------------------------------
define_method                    3.760000   0.000000   3.760000 (  3.805917)
--------------------------------------------------------- total: 3.760000sec

                                     user     system      total        real
define_method                    3.720000   0.010000   3.730000 (  3.752677)
Rehearsal ------------------------------------------------------------------
define_method                    4.840000   0.000000   4.840000 (  4.878589)
--------------------------------------------------------- total: 4.840000sec

                                     user     system      total        real
define_method                    4.290000   0.010000   4.300000 (  4.317462)