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From Daniel <dbati...@gmail.com>
Subject [users@httpd] About ab (or ab2) output
Date Tue, 22 Nov 2005 15:16:23 GMT
Hi to all!

I need help to understand the ab output. I tried a lot of associations
to the values but I always get an inconsistency :(

Below, is an example of output:

##########################################################################
$ /usr/bin/time ab -n 1 -c 1 http://localhost/

This is ApacheBench, Version 2.0.41-dev <$Revision: 1.141 $> apache-2.0
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient).....done


Server Software:        Apache/1.3.33
Server Hostname:        localhost
Server Port:            80

Document Path:          /
Document Length:        5258 bytes

Concurrency Level:      1
Time taken for tests:   0.1216 seconds
Complete requests:      1
Failed requests:        0
Write errors:           0
Total transferred:      5539 bytes
HTML transferred:       5258 bytes
Requests per second:    822.37 [#/sec] (mean)
Time per request:       1.216 [ms] (mean)
Time per request:       1.216 [ms] (mean, across all concurrent requests)
Transfer rate:          4111.84 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:     0    0   0.0      0       0
Waiting:        0    0   0.0      0       0
Total:          0    0   0.0      0       0

0.01user 0.01system 0:00.01elapsed 166%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (479major+49minor)pagefaults 0swaps
##########################################################################

I would like to understand the values "Time taken for tests", "Time
per request (mean)" and "Time per request (mean, across all concurrent
requests)".

1-) I did think that "Time taken for tests" was the runtime of ab, but
isn't (See the "time" output). What's the meaning of "Time taken for
tests"??

2-) What's the meaning of [ms]? It's miliseconds?

3-) What's the relation linking "Time per request" and "Time taken for
tests"? If I run the ab with 1 request and 1 concurrency level, these
values don't must to be equal?

4-) What's the relation linking "Time per request (mean)" and "Time
per request (mean, across all concurrent requests)"?

Thank you for atention,
Best regards,

Daniel Macêdo Batista
daniel.batista@ic.unicamp.br, http://www.ic.unicamp.br/~ra030022
Mestrando em Ciência da Computação pela Unicamp

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