gistfile1.rb

# config/database.yml
profile:
  development

# config/environments/profile.rb
config.cache_classes = true
config.action_view.cache_template_loading            = true
config.action_controller.perform_caching             = false
config.log_level = :info

require 'ruby-prof'


# config/initializers/profile.rb
module ControllerProfiling
  def self.included(base)
    base.class_eval do
      around_filter :profile 
    end
  end
  
  protected
    def profile
      result = RubyProf.profile { yield }
      printer = RubyProf::GraphPrinter.new(result)
      out = StringIO.new
      printer.print(out, 0)
      response.body = out.string
      response.content_type = "text/plain"  
    end
end

if Rails.env == 'profile'
  ApplicationController.send(:include, ControllerProfiling)
end