@RestController
public class RecController {

    private static final Logger logger = LoggerFactory.getLogger(RecController.class);

    @RequestMapping("/")
    public String rec() {
        return "1";

    }
}

[root@s96 ~]# ab -n 10000 -c 80 -k  http://localhost:8080/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)
Completed 1000 requests
Completed 2000 requests
Completed 3000 requests
Completed 4000 requests
Completed 5000 requests
Completed 6000 requests
Completed 7000 requests
Completed 8000 requests
Completed 9000 requests
Completed 10000 requests
Finished 10000 requests


Server Software:
Server Hostname:        localhost
Server Port:            8080

Document Path:          /
Document Length:        1 bytes

Concurrency Level:      80
Time taken for tests:   2.904 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Keep-Alive requests:    10000
Total transferred:      1400140 bytes
HTML transferred:       10001 bytes
Requests per second:    3443.70 [#/sec] (mean)
Time per request:       23.231 [ms] (mean)
Time per request:       0.290 [ms] (mean, across all concurrent requests)
Transfer rate:          470.86 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   4.7      0      67
Processing:     1   23   9.5     21     158
Waiting:        0   22   9.4     20     153
Total:          1   23  11.5     21     158

Percentage of the requests served within a certain time (ms)
  50%     21
  66%     21
  75%     22
  80%     24
  90%     39
  95%     43
  98%     49
  99%     85
 100%    158 (longest request)

[root@localhost ~]# ab -n 100000 -c 80 -k  http://localhost:8080/
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)
Completed 10000 requests
Completed 20000 requests
Completed 30000 requests
Completed 40000 requests
Completed 50000 requests
Completed 60000 requests
Completed 70000 requests
Completed 80000 requests
Completed 90000 requests
Completed 100000 requests
Finished 100000 requests


Server Software:
Server Hostname:        localhost
Server Port:            8080

Document Path:          /
Document Length:        1 bytes

Concurrency Level:      80
Time taken for tests:   4.586 seconds
Complete requests:      100000
Failed requests:        0
Write errors:           0
Keep-Alive requests:    100000
Total transferred:      14000000 bytes
HTML transferred:       100000 bytes
Requests per second:    21806.88 [#/sec] (mean)
Time per request:       3.669 [ms] (mean)
Time per request:       0.046 [ms] (mean, across all concurrent requests)
Transfer rate:          2981.41 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.2      0       8
Processing:     0    4   2.7      3      56
Waiting:        0    4   2.7      3      56
Total:          0    4   2.7      3      56

Percentage of the requests served within a certain time (ms)
  50%      3
  66%      4
  75%      5
  80%      5
  90%      6
  95%      7
  98%      9
  99%     11
 100%     56 (longest request)