Eseguire benchmark con Apache Bench

Apache Bench è un tool per eseguire benchmark sul webserver Apache.

Dovrebbe essere già installato con il pacchetto apache2-utils.

In caso non lo sia, su Debian lo installate così:

# aptitude install apache2-utils

Fatto questo proviamo a lanciare un primo comando di esempio:

$ ab www.sito.it/
This is ApacheBench, Version 2.3 <$Revision: 1843412 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking ferrons.ddns.net (be patient).....done


Server Software:        Apache/2.4.38
Server Hostname:        www.sito.it
Server Port:            80

Document Path:          /
Document Length:        1546 bytes

Concurrency Level:      1
Time taken for tests:   0.018 seconds
Complete requests:      1
Failed requests:        0
Total transferred:      1737 bytes
HTML transferred:       1546 bytes
Requests per second:    54.41 [#/sec] (mean)
Time per request:       18.380 [ms] (mean)
Time per request:       18.380 [ms] (mean, across all concurrent requests)
Transfer rate:          92.29 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        4    4   0.0      4       4
Processing:    15   15   0.0     15      15
Waiting:       12   12   0.0     12      12
Total:         18   18   0.0     18      18

Senza opzioni non abbiamo tantissimi dati, quindi impostiamo qualche parametro:

$ ab -t 10 -n 10000 -c 100 www.sito.it/
This is ApacheBench, Version 2.3 <$Revision: 1843412 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking www.sito.it (be patient)
Finished 302 requests


Server Software:        Apache/2.4.38
Server Hostname:        www.sito.it
Server Port:            80

Document Path:          /
Document Length:        1546 bytes

Concurrency Level:      100
Time taken for tests:   10.003 seconds
Complete requests:      302
Failed requests:        0
Total transferred:      543681 bytes
HTML transferred:       483898 bytes
Requests per second:    30.19 [#/sec] (mean)
Time per request:       3312.241 [ms] (mean)
Time per request:       33.122 [ms] (mean, across all concurrent requests)
Transfer rate:          53.08 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        5  621 329.9    512    1267
Processing:    35 2152 725.7   2077    3837
Waiting:       30 1935 744.3   1854    3626
Total:         39 2773 637.5   2704    4432

Percentage of the requests served within a certain time (ms)
  50%   2704
  66%   2836
  75%   3065
  80%   3121
  90%   3704
  95%   4113
  98%   4243
  99%   4294
 100%   4432 (longest request)

Dove:

• -t è il timeout per ogni richiesta
• -n è il numero di richieste
• -c imposta quante richieste simultanee vanno inviate

Ovviamente al posto di www.sito.it dovete impostare l'hostname messo nella configurazione di Apache.

Enjoy!