ab -kc 10 -t 30
(2 bytes - "ok")
Finished 48657 requests

Server Software:        Apache
Server Hostname:        www.rankmonster.com
Server Port:            80

Document Path:          /ping.html
Document Length:        2 bytes

Concurrency Level:      10
Time taken for tests:   30.788 seconds
Complete requests:      48657
Failed requests:        0
Write errors:           0
Keep-Alive requests:    48420
Total transferred:      16508746 bytes
HTML transferred:       97314 bytes
Requests per second:    1621.86 [#/sec] (mean)
Time per request:       6.166 [ms] (mean)
Time per request:       0.617 [ms] (mean, across all concurrent requests)
Transfer rate:          537.35 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.4      0       9
Processing:     2    5   1.5      5      46
Waiting:        2    5   1.5      5      46
Total:          2    5   1.5      5      46

Percentage of the requests served within a certain time (ms)
  50%      5
  66%      6
  75%      6
  80%      6
  90%      7
  95%      8
  98%      9
  99%     10
 100%     46 (longest request)




ab -kc 10 -t 30
(phpinfo() output)
Finished 4825 requests


Server Software:        Apache
Server Hostname:        www.rankmonster.com
Server Port:            80

Document Path:          /ts.php
Document Length:        0 bytes

Concurrency Level:      10
Time taken for tests:   30.5413 seconds
Complete requests:      4825
Failed requests:        0
Write errors:           0
Keep-Alive requests:    4803
Total transferred:      1164460 bytes
HTML transferred:       0 bytes
Requests per second:    160.80 [#/sec] (mean)
Time per request:       62.187 [ms] (mean)
Time per request:       6.219 [ms] (mean, across all concurrent requests)
Transfer rate:          37.89 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.1      0       3
Processing:    12   61  37.4     58    1023
Waiting:       12   61  37.4     58    1022
Total:         12   61  37.4     58    1023

Percentage of the requests served within a certain time (ms)
  50%     58
  66%     67
  75%     74
  80%     79
  90%     95
  95%    110
  98%    138
  99%    160
 100%   1023 (longest request)