Interesting differences running ab -n 1000 -c 10 http://localhost/
1.5Ghz PowerBook G4 running Apache 1.3.3 OS X 10.4.6
Server Software: Apache/1.3.33
Server Hostname: localhost
Server Port: 80
Document Path: /
Document Length: 1456 bytes
Concurrency Level: 10
Time taken for tests: 2.432 seconds
Complete requests: 1000
Failed requests: 0
Broken pipe errors: 0
Total transferred: 1867000 bytes
HTML transferred: 1456000 bytes
Requests per second: 411.18 [#/sec] (mean)
Time per request: 24.32 [ms] (mean)
Time per request: 2.43 [ms] (mean, across all concurrent requests)
Transfer rate: 767.68 [Kbytes/sec] received
Connnection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 1.4 0 13
Processing: 8 22 28.9 13 292
Waiting: 2 22 28.9 12 291
Total: 8 23 28.8 13 292
Percentage of the requests served within a certain time (ms)
50% 13
66% 15
75% 18
80% 23
90% 41
95% 75
98% 134
99% 153
100% 292 (last request)
And Mac mini 1.25 Apache 2.2 OS X 10.4.6 Server:
Server Software: Apache/2.2.0
Server Hostname: localhost
Server Port: 80
Document Path: /
Document Length: 5634 bytes
Concurrency Level: 10
Time taken for tests: 2.655151 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 5
Total transferred: 5939098 bytes
HTML transferred: 5622732 bytes
Requests per second: 376.63 [#/sec] (mean)
Time per request: 26.552 [ms] (mean)
Time per request: 2.655 [ms] (mean, across all concurrent requests)
Transfer rate: 2184.06 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 3.2 0 97
Processing: 4 25 27.1 15 140
Waiting: 0 0 0.0 0 0
Total: 4 25 27.3 15 140
Percentage of the requests served within a certain time (ms)
50% 15
66% 15
75% 20
80% 26
90% 56
95% 110
98% 118
99% 130
100% 140 (longest request)