redis ORMs/mongo ORM benchmarks

.rvmrc

rvm 1.9.2@ohm

Gemfile

source 'http://rubygems.org'

gem 'ohm'
gem 'redis'
gem 'yajl-ruby'
gem 'mongoid'
gem 'bson_ext'

Gemfile.lock

GEM
  remote: http://rubygems.org/
  specs:
    activemodel (3.1.3)
      activesupport (= 3.1.3)
      builder (~> 3.0.0)
      i18n (~> 0.6)
    activesupport (3.1.3)
      multi_json (~> 1.0)
    bson (1.5.1)
    bson_ext (1.5.1)
    builder (3.0.0)
    i18n (0.6.0)
    mongo (1.5.1)
      bson (= 1.5.1)
    mongoid (2.3.4)
      activemodel (~> 3.1)
      mongo (~> 1.3)
      tzinfo (~> 0.3.22)
    multi_json (1.0.4)
    nest (1.1.0)
      redis (~> 2.1)
    ohm (0.1.3)
      nest (~> 1.0)
    redis (2.2.2)
    tzinfo (0.3.31)
    yajl-ruby (1.1.0)

PLATFORMS
  ruby

DEPENDENCIES
  bson_ext
  mongoid
  ohm
  redis
  yajl-ruby

gistfile1.rb

require 'benchmark'
require 'ohm'
require 'redis'
require 'yajl/json_gem'
require 'mongoid'

redis = Redis.new

Ohm.connect

Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db("testings")
end

Mongoid.master.collections.select do |collection|
  collection.name !~ /system/
end.each(&:drop)

class OhmUser < Ohm::Model
  attribute :username
  attribute :email    
end
  
class MongoidUser
  include Mongoid::Document
  
  field :username, :type => String
  field :email, :type => String
end

n = 500
Benchmark.bm do |x|
  data = {:username => "ian", :email => '[email protected]'}
  x.report("Ohm creates") {
    Ohm.redis.flushdb
    n.times do
      OhmUser.create(data).save
    end
  }
  x.report("raw redis creates, with json field") {
    n.times do
      redis.set("ian", data.to_json)
    end
  }
  x.report("Mongoid creates") {
    n.times do
      MongoidUser.new(data).save
    end
  }
  x.report("Ohm reads") {
    n.times do
      OhmUser.all
    end
  }
  x.report("raw redis reads") {
    n.times do
      JSON.parse(redis.get("ian"))
    end
  }
  x.report("Mongoid reads") {
    n.times do
      MongoidUser.all.map(&:_id)
    end
  }
end

results

~ $ ruby redis-vs-mongo.rb 
                                        user     system      total        real
Ohm creates                         0.370000   0.110000   0.480000 (  0.716614)
raw redis creates, with json field  0.060000   0.010000   0.070000 (  0.085520)
Mongoid creates                     0.170000   0.010000   0.180000 (  1.532263)

Ohm reads                           0.010000   0.000000   0.010000 (  0.013157)
raw redis reads                     0.020000   0.000000   0.020000 (  0.052765)
Mongoid reads                      10.890000   1.050000  11.940000 ( 12.718300)