require "benchmark/ips"

require "action_view"

require "action_pack"

require "action_controller"

require "active_record"

require "stackprof"

ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")

ActiveRecord::Schema.define do

create_table :customers, force: true do |t|

t.string :name

end

end

class Customer < ActiveRecord::Base; end

class TestController < ActionController::Base

end

ActionView::PartialRenderer.collection_cache = ActiveSupport::Cache::MemoryStore.new

TestController.view_paths = [File.expand_path("perf_scripts/partial_cache")]

puts TestController.view_paths

# Create a bunch of data

letters = ("a".."z").to_a * 5

1000.times { Customer.create!(name: letters.sample(10).join) }

customers = Customer.all.to_a

controller_view = TestController.new.view_context

# Heat compilation cache and collection cache

controller_view.render("render_collection", customers: customers)

controller_view.render("render_collection_with_cache", customers: customers)

p ActionView::PartialRenderer.collection_cache # 1000 entries

Benchmark.ips do |x|

x.report("collection render: no cache") do

controller_view.render("render_collection", customers: customers)

end

x.report("collection render: with cache") do

controller_view.render("render_collection_with_cache", customers: customers)

end

x.compare!

end