Call comparisons

benchmark.rb

class Processor
  def plus_two(arg)
    arg + 2
  end
end

class Runner
  def block_run(arg, &block)
    yield arg
  end

  def sender(arg, cls, mth)
    cls.send mth, arg
  end
end

lambda = -> (arg) { arg + 2 }
proc = Proc.new {|arg| arg + 2 }

processor = Processor.new
runner = Runner.new

meth = processor.method(:plus_two)
rebinder = Processor.new
rebound = meth.unbind.bind rebinder

Benchmark.ips do |test|
  test.report("Direct calls") { processor.plus_two(2) }
  test.report("Via send") { runner.sender(2, processor, :plus_two) }
  test.report("Blocks") { runner.block_run(2) {|arg| arg + 2 } }
  test.report("Lambda") { runner.block_run(2, &lambda) }
  test.report("Proc") { runner.block_run(2, &proc) }
  test.report("Method") { runner.block_run(2, &meth) }
  test.report("Rebound direct call") { rebinder.plus_two(2) }
  test.report("Rebound method") { runner.block_run(2, &rebound) }

  test.compare!
end

perf.txt

Calculating -------------------------------------
        Direct calls   135.058k i/100ms
            Via send   125.582k i/100ms
              Blocks    79.429k i/100ms
              Lambda   129.758k i/100ms
                Proc   122.336k i/100ms
              Method    60.091k i/100ms
 Rebound direct call   139.934k i/100ms
      Rebound method    59.337k i/100ms
-------------------------------------------------
        Direct calls      7.723M (± 6.9%) i/s -     38.492M
            Via send      5.190M (± 6.6%) i/s -     25.870M
              Blocks      1.515M (± 7.4%) i/s -      7.546M
              Lambda      5.252M (± 7.2%) i/s -     26.211M
                Proc      5.446M (± 5.3%) i/s -     27.159M
              Method    998.451k (± 6.2%) i/s -      4.988M
 Rebound direct call      8.097M (± 5.7%) i/s -     40.441M
      Rebound method      1.018M (± 5.7%) i/s -      5.103M

Comparison:
 Rebound direct call:  8096886.8 i/s
        Direct calls:  7722969.7 i/s - 1.05x slower
                Proc:  5445994.0 i/s - 1.49x slower
              Lambda:  5251876.4 i/s - 1.54x slower
            Via send:  5190066.6 i/s - 1.56x slower
              Blocks:  1515285.7 i/s - 5.34x slower
      Rebound method:  1017916.6 i/s - 7.95x slower
              Method:   998451.0 i/s - 8.11x slower