benchmark ruby method delegation

methods-ips.rb

require 'benchmark/ips'

class Bass
  def initialize(hash)
    @hash = hash
  end
end

class Testing < Bass
  def []=(key, value)
    @hash[key] = value
  end

  def [](key)
    @hash[key]
  end
end


class Forwarding  < Bass
  extend Forwardable

  def_delegators :@hash, :[]=, :[]
end

class Missinged < Bass
  def method_missing(meth, *args)
    if @hash.respond_to? meth
      @hash.send(meth, *args)
    else
      super
    end
  end
end

test = Testing.new one: 1, two: 2
fwd = Forwarding.new one: 1, two: 2
msg = Missinged.new one: 1, two: 2

Benchmark.ips do |x|
  x.config(:time => 5, :warmup => 2)

  x.report("method") { test[:two] }
  x.report("forward") { fwd[:two] }
  x.report("missing") { msg[:two] }

  x.compare!
end

Benchmark.ips do |x|
  x.config(:time => 5, :warmup => 2)

  x.report("method") { test[:one] = 3 }
  x.report("forward") { fwd[:one] = 3 }
  x.report("missing") { msg[:one] = 3 }

  x.compare!
end

results.txt

Calculating -------------------------------------
              method   143.572k i/100ms
             forward   110.827k i/100ms
             missing   103.273k i/100ms
-------------------------------------------------
              method      6.891M (± 6.6%) i/s -     34.314M
             forward      3.178M (± 4.2%) i/s -     15.959M
             missing      2.583M (± 4.2%) i/s -     12.909M

Comparison:
              method:  6890944.2 i/s
             forward:  3177632.4 i/s - 2.17x slower
             missing:  2582692.1 i/s - 2.67x slower

Calculating -------------------------------------
              method   142.653k i/100ms
             forward   110.198k i/100ms
             missing   101.819k i/100ms
-------------------------------------------------
              method      6.184M (± 5.9%) i/s -     30.956M
             forward      2.916M (± 5.8%) i/s -     14.546M
             missing      2.387M (± 5.8%) i/s -     11.913M

Comparison:
              method:  6183999.6 i/s
             forward:  2916127.8 i/s - 2.12x slower
             missing:  2387408.8 i/s - 2.59x slower