benchmark.rb

require 'rubygems'
require 'benchmark/ips'
require 'ruby-prof'

$LOAD_PATH.unshift File.join(File.dirname(__FILE__), 'lib')
require 'jbuilder'
require 'jbuilder/jbuilder_template'

module Rails
  def self.cache
    @cache ||= ActiveSupport::Cache::MemoryStore.new
  end
end

class FakeController
  def perform_caching
    true
  end
end

class FakeContext
  attr_reader :controller

  def initialize
    @controller = FakeController.new
  end
end

def render
  JbuilderTemplate.encode FakeContext.new do |json|
    yield json
  end
end

def keys json, i
  json.a i
  json.b i
  json.c i
  json.d i
  json.e i

  json.subitems 0..100 do |j|
    json.f i.to_s * j
    json.g i.to_s * j
    json.h i.to_s * j
    json.i i.to_s * j
    json.j i.to_s * j
  end
end

Benchmark.ips do |x|
  x.report 'basic' do
    render do |json|
      # Replicating the large arrays with objects-with-lots-of-keys scenario
      json.cached do
        json.cache! 'cached' do
          json.array! 0..100 do |i|
            keys json, i
          end
        end
      end
    end
  end
end