perform_action_with_benchmark

# File actionpack/lib/action_controller/benchmarking.rb, line 64
      def perform_action_with_benchmark
        unless logger
          perform_action_without_benchmark
        else
          runtime = [ Benchmark::measure{ perform_action_without_benchmark }.real, 0.0001 ].max

          log_message  = "Completed in #{sprintf("%.5f", runtime)} (#{(1 / runtime).floor} reqs/sec)"
          log_message << rendering_runtime(runtime) if defined?(@rendering_runtime)
          log_message << active_record_runtime(runtime) if Object.const_defined?("ActiveRecord") && ActiveRecord::Base.connected?
          log_message << " | #{headers["Status"]}"
          log_message << " [#{complete_request_uri rescue "unknown"}]"

          logger.info(log_message)
          response.headers["X-Runtime"] = sprintf("%.5f", runtime)
        end
      end