delegator_bench.rb

require "delegate"

class BankAccount
  def number
    123456
  end
end

class SimpleDelegatorBankAccount < SimpleDelegator
end

class DelegateClassBankAccount < DelegateClass(BankAccount)
end

class ManualDelegatorBankAccount
  def initialize(target)
    @target = target
  end

  def number
    @target.number
  end
end

account = BankAccount.new
sdba = SimpleDelegatorBankAccount.new(account)
dcba = DelegateClassBankAccount.new(account)
mdba = ManualDelegatorBankAccount.new(account)

require "benchmark"

puts RUBY_VERSION

n = 1_000_000
Benchmark.bmbm(20) do |x|
  x.report("direct call") do
    n.times do
      _ = account.number
    end
  end
  x.report("manual delegation") do
    n.times do
      _ = mdba.number
    end
  end
  x.report("SimpleDelegator") do
    n.times do
      _ = sdba.number
    end
  end
  x.report("DelegateClass") do
    n.times do
      _ = dcba.number
    end
  end
end

# >> 2.2.0
# >> Rehearsal --------------------------------------------------------
# >> direct call            2.210000   0.020000   2.230000 (  2.332280)
# >> manual delegation      3.410000   0.070000   3.480000 (  3.500194)
# >> SimpleDelegator        2.850000   0.060000   2.910000 (  2.920977)
# >> DelegateClass          3.370000   0.020000   3.390000 (  3.411052)
# >> ---------------------------------------------- total: 12.010000sec
# >> 
# >>                            user     system      total        real
# >> direct call            1.800000   0.030000   1.830000 (  1.834531)
# >> manual delegation      2.830000   0.130000   2.960000 (  2.958950)
# >> SimpleDelegator        2.960000   0.040000   3.000000 (  3.038120)
# >> DelegateClass          2.390000   0.030000   2.420000 (  2.878221)


=begin #beckers
ruby bm2.rb
2.1.3
Rehearsal --------------------------------------------------------
direct call            0.060000   0.000000   0.060000 (  0.060608)
manual delegation      0.080000   0.000000   0.080000 (  0.079547)
SimpleDelegator        0.320000   0.000000   0.320000 (  0.320238)
DelegateClass          0.270000   0.000000   0.270000 (  0.275023)
----------------------------------------------- total: 0.730000sec

                           user     system      total        real
direct call            0.070000   0.000000   0.070000 (  0.063817)
manual delegation      0.080000   0.000000   0.080000 (  0.086517)
SimpleDelegator        0.330000   0.000000   0.330000 (  0.332198)
DelegateClass          0.290000   0.000000   0.290000 (  0.295056)


/usr/local/Cellar/ruby/2.2.0/bin/ruby bm2.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]

Rehearsal --------------------------------------------------------
direct call            0.070000   0.000000   0.070000 (  0.067561)
manual delegation      0.090000   0.000000   0.090000 (  0.090520)
SimpleDelegator        0.370000   0.000000   0.370000 (  0.369554)
DelegateClass          0.290000   0.000000   0.290000 (  0.294461)
----------------------------------------------- total: 0.820000sec

                           user     system      total        real
direct call            0.070000   0.000000   0.070000 (  0.065939)
manual delegation      0.090000   0.000000   0.090000 (  0.094444)
SimpleDelegator        0.370000   0.000000   0.370000 (  0.364165)
DelegateClass          0.300000   0.000000   0.300000 (  0.302042)
=end