benchmark (ActionController::RequestProfiler::Sandbox)

    # File lib/action_controller/request_profiler.rb, line 20
          def benchmark(n)
            @quiet = true
            print '  '
            result = Benchmark.realtime do
              n.times do |i|
                run
                print i % 10 == 0 ? 'x' : '.'
                $stdout.flush
              end
            end
            puts
            result
          ensure
            @quiet = false
          end