Benchmark of creating 1,000,000 objects of a Struct generated class, OpenStruct and Hash

measure-struct-vs-hash.rb

#!/usr/bin/ruby

require 'benchmark'
require 'ostruct'

REP = 10**6

Cl = Struct.new :name, :age

Benchmark.bmbm 20 do |x|
  x.report "struct" do
    REP.times { Cl.new "User", 21 }
  end

  x.report "open struct with hash" do
    REP.times { OpenStruct.new(:user => "User", :age => 21) }
  end

  x.report "open struct no hash" do
    REP.times {
      os = OpenStruct.new
      os.user = "User"
      os.age = 21
    }
  end

  x.report "hash" do
    REP.times { {:name => "User" , :age => 21} }
  end
end

output.txt

$ ruby -v
ruby 2.0.0p598 (2014-11-13) [x86_64-cygwin]
$ ./measure-struct-vs-hash.rb
Rehearsal ---------------------------------------------------------
struct                  0.281000   0.000000   0.281000 (  0.283016)
open struct with hash  11.076000   0.000000  11.076000 ( 11.068633)
open struct no hash    12.605000   0.000000  12.605000 ( 12.605721)
hash                    0.577000   0.000000   0.577000 (  0.589034)
----------------------------------------------- total: 24.539000sec

                            user     system      total        real
struct                  0.281000   0.000000   0.281000 (  0.291017)
open struct with hash  11.154000   0.000000  11.154000 ( 11.145637)
open struct no hash    12.574000   0.000000  12.574000 ( 12.575719)
hash                    0.546000   0.000000   0.546000 (  0.549031)