Sequential Test Cases for Dynamic Pages

In this chapter, we will describe the various combinations of -n and -c with the important flags to gradually increase the load on your webserver.
You should mainly focus on how the following metrics change as you increase the load −
Requests per second
Connection Times (ms)
Percentage of the requests served within a certain time (ms)
You should also notice for the threshold value when server starts getting stuck and you start getting failed requests.
Let us do 100 sequential page-loads by a single user −
$ ab -l -r -n 100 -c 1 -k -H "Accept-Encoding: gzip, deflate"  http://127.0.0.1:8000/

This is ApacheBench, Version 2.3 <$Revision: 1604373 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient).....done


Server Software:        Rocket
Server Hostname:        127.0.0.1
Server Port:            8000

Document Path:          /
Document Length:        Variable

Concurrency Level:      1
Time taken for tests:   0.045 seconds
Complete requests:      100
Failed requests:        0
Non-2xx responses:      100
Keep-Alive requests:    0
Total transferred:      27700 bytes
HTML transferred:       6600 bytes
Requests per second:    2206.24 [#/sec] (mean)
Time per request:       0.453 [ms] (mean)
Time per request:       0.453 [ms] (mean, across all concurrent requests)
Transfer rate:          596.80 [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       1

Percentage of the requests served within a certain time (ms)
  50%      0
  66%      0
  75%      0
  80%      0
  90%      1
  95%      1
  98%      1
  99%      1
 100%      1 (longest request)

This case corresponds to a peak load on a website that gets around 50,000+ hits a month.
$ ab -l -r -n 10 -c 5 -k -H "Accept-Encoding: gzip, deflate"  http://127.0.0.1:8000/

In the following subsequent outputs, we will be omitting the common header for clarity purpose.
...
Requests per second:    2009.24 [#/sec] (mean)
Time per request:       2.488 [ms] (mean)
Time per request:       0.498 [ms] (mean, across all concurrent requests)
Transfer rate:          543.52 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   0.5      1       2
Processing:     0    1   0.5      1       2
Waiting:        0    1   0.5      1       1
Total:          2    2   0.4      3       3
ERROR: The median and mean for the total time are more than twice the standard
       deviation apart. These results are NOT reliable.

Percentage of the requests served within a certain time (ms)
  50%      3
  66%      3
  75%      3
  80%      3
  90%      3
  95%      3
  98%      3
  99%      3
 100%      3 (longest request)

This test corresponds to 100 page loads by 10 different concurrent users, each user is doing 10 sequential pages loads.
$ ab  -r -n 10 -c 10 -k -H "Accept-Encoding: gzip, deflate"  http://127.0.0.1:8000/

...
Requests per second:    2225.68 [#/sec] (mean)
Time per request:       4.493 [ms] (mean)
Time per request:       0.449 [ms] (mean, across all concurrent requests)
Transfer rate:          602.07 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        1    2   0.7      2       3
Processing:     0    2   1.0      2       3
Waiting:        0    1   1.0      2       3
Total:          4    4   0.3      4       4
WARNING: The median and mean for the waiting time are not within a normal deviation
        These results are probably not that reliable.

Percentage of the requests served within a certain time (ms)
  50%      4
  66%      4
  75%      4
  80%      4
  90%      4
  95%      4
  98%      4
  99%      4
 100%      4 (longest request)

This test corresponds to 400 page loads by 20 different concurrent users, each user is doing 20 sequential pages loads.
$ ab -r -n 20 -c 20 -k -H “Accept-Encoding: gzip, deflate” http://127.0.0.1:8000/

...
Requests per second:    1619.96 [#/sec] (mean)
Time per request:       12.346 [ms] (mean)
Time per request:       0.617 [ms] (mean, across all concurrent requests)
Transfer rate:          438.21 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        2    6   2.3      6      10
Processing:     1    5   2.9      5      10
Waiting:        0    5   2.9      5       9
Total:         10   11   0.6     11      12

Percentage of the requests served within a certain time (ms)
  50%     11
  66%     11
  75%     12
  80%     12
  90%     12
  95%     12
  98%     12
  99%     12
 100%     12 (longest request)
 
This test corresponds to 900 page loads by 30 different concurrent users, each user is doing 30 sequential pages loads.
$ ab  -r -n 30 -c 30 -k -H "Accept-Encoding: gzip, deflate"  http://127.0.0.1:8000/

...
Requests per second:    2283.45 [#/sec] (mean)
Time per request:       13.138 [ms] (mean)
Time per request:       0.438 [ms] (mean, across all concurrent requests)
Transfer rate:          617.69 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        2    6   2.7      6      11
Processing:     1    6   3.1      6      11
Waiting:        0    5   3.2      5      10
Total:         11   12   0.5     12      13

Percentage of the requests served within a certain time (ms)
  50%     12
  66%     12
  75%     12
  80%     12
  90%     13
  95%     13
  98%     13
  99%     13
 100%     13 (longest request)

We have now learned how to increase the load gradually on the website and test its performance.

    46 Lectures 
     3.5 hours 

 Arnab Chakraborty

    23 Lectures 
     1.5 hours 

 Mukund Kumar Mishra

    16 Lectures 
     1 hours 

 Nilay Mehta

    52 Lectures 
     1.5 hours 

 Bigdata Engineer

    14 Lectures 
     1 hours 

 Bigdata Engineer

    23 Lectures 
     1 hours 

 Bigdata Engineer
 Print
 Add Notes
 Bookmark this page