Gemfile

# frozen_string_literal: true

source "https://rubygems.org"

gem "benchmark-ips"
gem "ruby-progressbar"
gem "benchmark-memory"

openstruct_bench.rb

# frozen_string_literal: true

require "bundler"
Bundler.require
require "ostruct"

data = { x: 100, y: 200, z: "some other data", a: "more text data", b: 1100.00, c: Time.now }

PointStruct = Struct.new(:x, :y, :z, :a, :b, :c)

class PointClass
  attr_accessor :x, :y, :z, :a, :b, :c

  def initialize(args)
    @x = args.fetch(:x)
    @y = args.fetch(:y)
    @z = args.fetch(:z)
    @a = args.fetch(:a)
    @b = args.fetch(:b)
    @c = args.fetch(:c)
  end
end

puts "\n\nINITIALIZATION =========="

Benchmark.ips do |x|
  x.report("OpenStruct") { OpenStruct.new(data) }
  x.report("Struct") { PointStruct.new(data) }
  x.report("Class") { PointClass.new(data) }
  x.report("Hash") { {}.merge(data) }

  x.compare!
end

puts "\n\nREAD =========="

point_struct = PointStruct.new(data)
point_class = PointClass.new(data)
point_hash = {}.merge(data)
point_open_struct = OpenStruct.new(data)

Benchmark.ips do |x|
  x.config(warmup: 90) if RUBY_ENGINE == "jruby"
  x.report("OpenStruct") { point_open_struct.z }
  x.report("Struct") { point_struct.z }
  x.report("Class") {  point_class.z }
  x.report("Hash") { point_hash.fetch(:z) }

  x.compare!
end

puts "\n\nWRITE =========="

Benchmark.ips do |x|
  x.report("OpenStruct") do
    point_open_struct.x = "even more data"
    point_open_struct.z = 1000.00
    point_open_struct.b = 100
  end
  x.report("Struct") do
    point_struct.x = "even more data"
    point_struct.z = 1000.00
    point_struct.b = 100
  end
  x.report("Class") do
    point_class.x = "even more data"
    point_class.z = 1000.00
    point_class.b = 100
  end
  x.report("Hash") do
    point_hash[:x] = "even more data"
    point_hash[:z] = 1000.00
    point_hash[:b] = 100
  end

  x.compare!
end

puts "\n\n############# MEMORY =========="

puts "\n\nINITIALIZATION =========="

Benchmark.memory do |x|
  x.report("OpenStruct") { OpenStruct.new(data) }
  x.report("Struct") { PointStruct.new(data) }
  x.report("Class") { PointClass.new(data) }
  x.report("Hash") { {}.merge(data) }

  x.compare!
end

results.txt

INITIALIZATION ==========
Warming up --------------------------------------
          OpenStruct     7.763k i/100ms
              Struct   765.889k i/100ms
               Class   296.770k i/100ms
                Hash   451.498k i/100ms
Calculating -------------------------------------
          OpenStruct     77.672k (± 2.7%) i/s -    388.150k in   5.001142s
              Struct      7.618M (± 1.4%) i/s -     38.294M in   5.027768s
               Class      2.787M (±11.1%) i/s -     13.948M in   5.100858s
                Hash      4.338M (± 9.1%) i/s -     21.672M in   5.055607s

Comparison:
              Struct:  7618131.0 i/s
                Hash:  4337601.8 i/s - 1.76x  (± 0.00) slower
               Class:  2786751.9 i/s - 2.73x  (± 0.00) slower
          OpenStruct:    77672.0 i/s - 98.08x  (± 0.00) slower



READ ==========
Warming up --------------------------------------
          OpenStruct     1.189M i/100ms
              Struct     1.927M i/100ms
               Class     1.978M i/100ms
                Hash   769.667k i/100ms
Calculating -------------------------------------
          OpenStruct     11.407M (± 7.5%) i/s -     57.058M in   5.037030s
              Struct     18.108M (± 9.9%) i/s -     90.582M in   5.079644s
               Class     19.829M (± 2.2%) i/s -    100.895M in   5.090690s
                Hash     13.089M (± 2.1%) i/s -     65.422M in   5.000433s

Comparison:
               Class: 19828999.2 i/s
              Struct: 18107923.1 i/s - same-ish: difference falls within error
                Hash: 13089378.4 i/s - 1.51x  (± 0.00) slower
          OpenStruct: 11406605.9 i/s - 1.74x  (± 0.00) slower



WRITE ==========
Warming up --------------------------------------
          OpenStruct   414.666k i/100ms
              Struct     1.347M i/100ms
               Class     1.254M i/100ms
                Hash   800.079k i/100ms
Calculating -------------------------------------
          OpenStruct      4.136M (± 0.5%) i/s -     20.733M in   5.013139s
              Struct     13.239M (± 3.5%) i/s -     67.370M in   5.095966s
               Class     12.363M (±14.1%) i/s -     60.171M in   5.051611s
                Hash      7.970M (± 5.6%) i/s -     40.004M in   5.039890s

Comparison:
              Struct: 13238563.6 i/s
               Class: 12362712.8 i/s - same-ish: difference falls within error
                Hash:  7969707.0 i/s - 1.66x  (± 0.00) slower
          OpenStruct:  4135881.8 i/s - 3.20x  (± 0.00) slower



############# MEMORY ==========


INITIALIZATION ==========
Calculating -------------------------------------
          OpenStruct     4.384k memsize (     0.000  retained)
                        45.000  objects (     0.000  retained)
                         6.000  strings (     0.000  retained)
              Struct    88.000  memsize (     0.000  retained)
                         1.000  objects (     0.000  retained)
                         0.000  strings (     0.000  retained)
               Class    88.000  memsize (     0.000  retained)
                         1.000  objects (     0.000  retained)
                         0.000  strings (     0.000  retained)
                Hash   208.000  memsize (     0.000  retained)
                         2.000  objects (     0.000  retained)
                         0.000  strings (     0.000  retained)

Comparison:
              Struct:         88 allocated
               Class:         88 allocated - same
                Hash:        208 allocated - 2.36x more
          OpenStruct:       4384 allocated - 49.82x more