Handy controller profiling code

application_controller.rb

    around_filter :profile

    def profile
      if params[:profile] && result = RubyProf.profile { yield }
        out = StringIO.new
        RubyProf::GraphHtmlPrinter.new(result).print out, :min_percent => 0
        self.response_body = out.string
      else
        yield
      end
    end