mongoid document performance

document_perf.rb

require 'benchmark'
require 'mongoid'

class FakeModel
  attr_accessor :test1, :test2, :test3, :test4, :test5, :test6, :test7, :test8
  def initialize
    self.test1 = 1
    self.test2 = 1
    self.test3 = 1
    self.test4 = 1
    self.test5 = 1
    self.test6 = 1
    self.test7 = 1
    self.test8 = 1
  end

  def + other
    self.test1 += other.test1
    self.test2 += other.test2
    self.test3 += other.test3
    self.test4 += other.test4
    self.test5 += other.test5
    self.test6 += other.test6
    self.test7 += other.test7
    self.test8 += other.test8
  end
end

class MongoidFake
  include Mongoid::Document
  field :name, type: String
  field :load,       type: Float, default: 0.0
  field :unhedged,   type: Float, default: 0.0
  field :one_x_1,    type: Float, default: 0.0
  field :two_x_16,   type: Float, default: 0.0
  field :five_x_16,  type: Float, default: 0.0
  field :seven_x_8,  type: Float, default: 0.0
  field :seven_x_16, type: Float, default: 0.0
  field :seven_x_24, type: Float, default: 0.0
  field :wrap,       type: Float, default: 0.0

  def + other
    self.load += other.load
    self.unhedged += other.unhedged
    self.one_x_1 += other.one_x_1
    self.two_x_16 += other.two_x_16
    self.five_x_16 += other.five_x_16
    self.seven_x_8 += other.seven_x_8
    self.seven_x_16 += other.seven_x_16
    self.seven_x_24 += other.seven_x_24
    self.wrap += other.wrap
  end
end

n = 450 * 24
fm1 = FakeModel.new
fm2 = FakeModel.new
mf1 = MongoidFake.new
mf2 = MongoidFake.new

Benchmark.bm do |x|
  x.report { n.times do fm1 + fm2; end }
  x.report { n.times do mf1 + mf2; end }
end
#     user     system      total        real
# 0.020000   0.000000   0.020000 (  0.018330)
# 1.980000   0.000000   1.980000 (  1.981296)