benchmark_proc_vs_poro.rb

require 'benchmark/ips'

class CallableNoArg
  def call
  end
end

class CallableWithArg
  def call a
  end
end

class CallableWithThreeArgs
  def call a, b, c
  end
end

class CallableWithSplatArgs
  def call *args
  end
end

Benchmark.ips do |x|
  callable_no_arg = CallableNoArg.new
  proc_no_arg = proc {}

  x.report('callable no arg') { callable_no_arg.call }
  x.report('proc no arg') { proc_no_arg.call }

  callable_with_arg = CallableWithArg.new
  proc_with_arg = proc { |a| }

  x.report('callable with arg') { callable_with_arg.call 1 }
  x.report('proc with arg') { proc_with_arg.call 1 }

  callable_three_args = CallableWithThreeArgs.new
  proc_with_three_args = proc { |a, b, c| }

  x.report('callable 3 args') { callable_three_args.call 1, 2, 3 }
  x.report('proc 3 args') { proc_with_three_args.call 1, 2, 3 }

  callable_splat = CallableWithSplatArgs.new
  proc_splat_args = proc { |*args| }

  x.report('callable splat args (0)') { callable_splat.call }
  x.report('callable splat args (1)') { callable_splat.call 1 }
  x.report('callable splat args (3)') { callable_splat.call 1, 2, 3 }
  x.report('proc splat args (0)') { proc_splat_args.call }
  x.report('proc splat args (1)') { proc_splat_args.call 1 }
  x.report('proc splat args (3)') { proc_splat_args.call 1, 2, 3 }

  x.compare!
end

result-mri-2.5.1

Comparison:
     callable no arg: 10095848.2 i/s
   callable with arg:  9777103.9 i/s - same-ish: difference falls within error
     callable 3 args:  9460308.0 i/s - same-ish: difference falls within error
callable splat args (0):  6773190.5 i/s - 1.49x  slower
         proc no arg:  6747397.4 i/s - 1.50x  slower
       proc with arg:  6663572.5 i/s - 1.52x  slower
         proc 3 args:  6454715.5 i/s - 1.56x  slower
callable splat args (1):  5099903.4 i/s - 1.98x  slower
 proc splat args (0):  5028088.6 i/s - 2.01x  slower
callable splat args (3):  4880320.0 i/s - 2.07x  slower
 proc splat args (1):  4091623.1 i/s - 2.47x  slower
 proc splat args (3):  4005997.8 i/s - 2.52x  slower

result-on-jruby-9.2.0.0

Comparison:
callable splat args (0): 18537216.0 i/s
   callable with arg: 17866238.7 i/s - same-ish: difference falls within error
     callable 3 args: 17087534.2 i/s - same-ish: difference falls within error
callable splat args (3): 16986270.0 i/s - same-ish: difference falls within error
     callable no arg: 16853450.9 i/s - same-ish: difference falls within error
callable splat args (1): 16826254.7 i/s - same-ish: difference falls within error
         proc no arg: 14977646.8 i/s - 1.24x  slower
 proc splat args (0): 14117857.3 i/s - 1.31x  slower
 proc splat args (3): 13438650.8 i/s - 1.38x  slower
         proc 3 args: 13290881.0 i/s - 1.39x  slower
       proc with arg: 12848996.0 i/s - 1.44x  slower
 proc splat args (1): 11984049.1 i/s - 1.55x  slower