Struct vs Hash vs OpenStruct vs Class benchmark

struct_hash_ostruct_class

require 'benchmark'
require 'ostruct'
require 'memory_profiler'

i = 100000

User = Struct.new(:name, :age)

USER = "User".freeze
AGE = 21
HASH = { name: USER, age: AGE}.freeze

class Poro
  attr_accessor :user, :age

  def initialize(user, age)
    @user = user
    @age = age
  end
end

Benchmark.bm 20 do |x|
  x.report 'OpenStruct slow' do
    i.times { |index| OpenStruct.new(name: "User", age: 21) }
  end

  x.report 'OpenStruct fast' do
    i.times { |index| OpenStruct.new(HASH) }
  end

  x.report 'Struct slow' do
    i.times { |index| User.new("User", 21) }
  end

  x.report 'Struct fast' do
    i.times { |index| User.new(USER, AGE) }
  end

  x.report 'Hash slow' do
    i.times { |index| Hash.new(user: "User", age: 21) }
  end

  x.report 'Hash fast' do
    i.times { |index| Hash.new(HASH) }
  end

  x.report 'Class slow' do
    i.times { |index| Poro.new("User", 21) }
  end

  x.report 'Class fast' do
    i.times { |index| Poro.new(USER, AGE) }
  end
end

j = 100

results = {}
results[:openstruct_slow] = MemoryProfiler.report do
  (1..j).map { |index| OpenStruct.new(name: "User", age: 21) }
end

results[:openstruct_fast] = MemoryProfiler.report do
  (1..j).map { |index| OpenStruct.new(HASH) }
end

results[:struct_slow] = MemoryProfiler.report do
  (1..j).map { |index| User.new("User", 21) }
end

results[:struct_fast] = MemoryProfiler.report do
  (1..j).map { |index| User.new(USER, AGE) }
end

results[:hash_slow] = MemoryProfiler.report do
  (1..j).map { |index| Hash.new(user: "User", age: 21) }
end

results[:hash_fast] = MemoryProfiler.report do
  (1..j).map { |index| Hash.new(HASH) }
end

results[:klass_slow] = MemoryProfiler.report do
  (1..j).map { |index| Poro.new("User", 21) }
end

results[:klass_fast] = MemoryProfiler.report do
  (1..j).map { |index| Poro.new(USER, AGE) }
end

# Print a graph profile to text
results.each_pair do |type, result|
  puts type
  result.pretty_print
end