[root@vmdev ~]# ab -n 500 -c 10 -r http://192.168.1.121/test.php
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 192.168.1.121 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Finished 500 requests


Server Software:        lighttpd/1.4.31
Server Hostname:        192.168.1.121
Server Port:            80

Document Path:          /test.php
Document Length:        12 bytes

Concurrency Level:      10
Time taken for tests:   2.766 seconds
Complete requests:      500
Failed requests:        0
Write errors:           0
Total transferred:      92000 bytes
HTML transferred:       6000 bytes
Requests per second:    180.77 [#/sec] (mean)
Time per request:       55.318 [ms] (mean)
Time per request:       5.532 [ms] (mean, across all concurrent requests)
Transfer rate:          32.48 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        2    5   4.0      4      33
Processing:    18   50  22.9     45     181
Waiting:       18   49  22.8     44     181
Total:         25   55  22.6     50     185

Percentage of the requests served within a certain time (ms)
  50%     50
  66%     57
  75%     62
  80%     68
  90%     87
  95%     98
  98%    121
  99%    135
 100%    185 (longest request)