bench-next-simple

``bash
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Requests: 0 (0%), requests per second: 0, mean latency: 0 ms
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Target URL: http://127.0.0.1:3000
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Max requests: 50
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Concurrency level: 10
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Agent: none
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Completed requests: 50
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Total errors: 0
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Total time: 0.078080892 s
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Requests per second: 640
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Mean latency: 13.4 ms
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO Percentage of the requests served within a certain time
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO 50% 11 ms
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO 90% 23 ms
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO 95% 24 ms
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO 99% 27 ms
[Sat Dec 16 2017 20:43:29 GMT+0800 (CST)] INFO 100% 27 ms (longest request)
``