#411 Performance Testing pro

Mar 27, 2013 | 16 minutes | Performance

Learn how to add performance tests that automate benchmark and profile reports. Here I show how to find the bottlenecks to optimize a page. I also show how to compile Ruby with gcdata to get information about memory usage.

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          terminal
        
rake test:benchmark
rake test:profile
rbenv install ruby-1.9.3-p125-gcdata
rbenv shell ruby-1.9.3-p125-gcdata
gem install bundler
bundle

          Gemfile
        
gem 'ruby-prof', group: :test
gem 'test-unit', group: :test

          test/performance/browsing_test.rb
        
require 'test_helper'
require 'rails/performance_test_help'

class BrowsingTest < ActionDispatch::PerformanceTest
  # Refer to the documentation for all available options
  # self.profile_options = { :runs => 5, :metrics => [:wall_time, :memory]
  #                          :output => 'tmp/performance', :formats => [:flat] }

  def test_homepage
    get '/'
  end
end

          products_controller.rb
        
def index
  @products = Product.order("name").includes(:category)
end

          products/index.html.erb
        
<% @products.each do |product| %>
  <tr>
    <td><%= link_to product.name, "/products/#{product.to_param}" %></td>
    <td><%= product.category.name if product.category %></td>
    <td class="price"><%= "$%.2f" % product.price %></td>
    <td><%= link_to "edit", "/products/#{product.to_param}/edit" %></td>
  </tr>
<% end %>

          ruby-1.9.3-p125-gcdata
        
# from https://github.com/sstephenson/ruby-build/pull/327
[ -n "$CC" ] || export CC=cc

before_install_package() {
  if [ "$1" = "ruby-1.9.3-p125" ]
  then
    local patch_url="https://raw.github.com/wayneeseguin/rvm/master/patches/ruby/1.9.3/p125/gcdata.patch"
    
    echo "Applying garbage collection data patch..."
    echo "-> $patch_url"
    
    curl --silent $patch_url | patch --silent -p1
  fi
}

install_package "yaml-0.1.4" "http://pyyaml.org/download/libyaml/yaml-0.1.4.tar.gz#36c852831d02cf90508c29852361d01b"
install_package "ruby-1.9.3-p125" "http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-p125.tar.gz#e3ea86b9d3fc2d3ec867f66969ae3b92"
install_package "rubygems-1.8.23" "http://production.cf.rubygems.org/rubygems/rubygems-1.8.23.tgz#178b0ebae78dbb46963c51ad29bb6bd9" ruby