benchmark structs. Struct が速いのは当たり前なので ostruct と hashie の比較がメイン

benchmark_struct.rb

#!/usr/bin/env ruby
require 'benchmark'
require 'ostruct'
require 'hashie'

n = 1000000
O = Struct.new(:foo, :bar, :baz)


puts "Benchmark: Initialize"

Benchmark.bmbm(9) do |x|

  x.report('struct:  ') {
    n.times {
      o = O.new({foo: 1, bar: 2, baz: 3})
    }
  }

  x.report('ostruct: ') {
    n.times {
      o = OpenStruct.new({foo: 1, bar: 2, baz: 3})
    }
  }

  x.report('hashie:  ') {
    n.times {
      o = Hashie::Mash.new({foo: 1, bar: 2, baz: 3})
    }
  }

end

puts
puts "Benchmark: Read as []"

Benchmark.bmbm(9) do |x|
  s = O.new({foo: 1, bar: 2, baz: 3})
  o = OpenStruct.new({foo: 1, bar: 2, baz: 3})
  h = Hashie::Mash.new({foo: 1, bar: 2, baz: 3})

  x.report('struct:  ') {
    n.times {
      foo = s['foo']
    }
  }

  x.report('ostruct: ') {
    n.times {
      foo = o['foo']
    }
  }

  x.report('hashie:  ') {
    n.times {
      foo = h['foo']
    }
  }

end

puts
puts "Benchmark: Read as method"

Benchmark.bmbm(9) do |x|
  s = O.new({foo: 1, bar: 2, baz: 3})
  o = OpenStruct.new({foo: 1, bar: 2, baz: 3})
  h = Hashie::Mash.new({foo: 1, bar: 2, baz: 3})

  x.report('struct:  ') {
    n.times {
      foo = s.foo
    }
  }

  x.report('ostruct: ') {
    n.times {
      foo = o.foo
    }
  }

  x.report('hashie:  ') {
    n.times {
      foo = h.foo
    }
  }
end

result.txt

ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]
bench.rb:16: warning: assigned but unused variable - o
bench.rb:22: warning: assigned but unused variable - o
bench.rb:28: warning: assigned but unused variable - o
bench.rb:44: warning: assigned but unused variable - foo
bench.rb:50: warning: assigned but unused variable - foo
bench.rb:56: warning: assigned but unused variable - foo
bench.rb:72: warning: assigned but unused variable - foo
bench.rb:78: warning: assigned but unused variable - foo
bench.rb:84: warning: assigned but unused variable - foo
Benchmark: Initialize
Rehearsal ---------------------------------------------
struct:     0.710000   0.010000   0.720000 (  0.719889)
ostruct:   13.870000   0.010000  13.880000 ( 13.885477)
hashie:     3.950000   0.010000   3.960000 (  3.950151)
----------------------------------- total: 18.560000sec

                user     system      total        real
struct:     0.690000   0.000000   0.690000 (  0.694495)
ostruct:   13.820000   0.020000  13.840000 ( 13.842891)
hashie:     3.940000   0.000000   3.940000 (  3.945889)

Benchmark: Read as []
Rehearsal ---------------------------------------------
struct:     0.250000   0.000000   0.250000 (  0.248579)
ostruct:    0.250000   0.000000   0.250000 (  0.250578)
hashie:     0.310000   0.000000   0.310000 (  0.304485)
------------------------------------ total: 0.810000sec

                user     system      total        real
struct:     0.240000   0.000000   0.240000 (  0.248644)
ostruct:    0.240000   0.000000   0.240000 (  0.241594)
hashie:     0.310000   0.000000   0.310000 (  0.312770)

Benchmark: Read as method
Rehearsal ---------------------------------------------
struct:     0.070000   0.000000   0.070000 (  0.067485)
ostruct:    0.140000   0.000000   0.140000 (  0.142525)
hashie:     0.650000   0.000000   0.650000 (  0.647260)
------------------------------------ total: 0.860000sec

                user     system      total        real
struct:     0.070000   0.000000   0.070000 (  0.067258)
ostruct:    0.140000   0.000000   0.140000 (  0.140880)
hashie:     0.640000   0.000000   0.640000 (  0.639556)

この initialize は新しいキーを用いたwriteに当たるから当然キーの数で結果変わるよな…そこもパラメータにしないといけない。