Kiwi TCMS API performance baseline

7.5 req/sec or 130 msec/req

Posted by Alexander Todorov on Fri 26 October 2018

A friend from Red Hat sent me an email asking about Kiwi TCMS performance so I did an experiment to establish a baseline. For API requests I got 7.5 req/sec or 130 msec/req which is 1.5x slower than GitHub!

I used perf-script (see here) to measure that. The script takes the first 250 test cases from our test suite and on every execution creates a new TestPlan (1 API request), then creates new test cases (250 requests), adds cases to test plan (250 requests), creates new product build (1 API request), creates new TestRun (1 API request), adds test cases to test run (250 requests) and finally updates the statuses (250 requests).

A total of 1003 API requests are sent to Kiwi TCMS every time you start this script! An example is available at TR #567!

On localhost, running the development server (./ runserver) with an SQLite database I got:

$ time python perf-script

real    2m6.450s
user    0m1.069s
sys     0m0.331s

$ time python perf-script

real    2m7.472s
user    0m1.057s
sys     0m0.342s

$ time python perf-script

real    2m9.368s
user    0m1.072s
sys     0m0.351s

$ time python perf-script

real    2m9.197s
user    0m1.050s
sys     0m0.353s

This measures at 120 msec/req or 7.85 req/sec! is running on an AWS t2.micro instance (via docker-compose) with the default centos/mariadb image! No extra settings or changes. I used the same computer over a WiFi connection and a pretty standard home-speed Internet connection. Times are:

$ time python perf-script

real    2m18.983s
user    0m1.175s
sys     0m0.095s

$ time python perf-script

real    2m25.937s
user    0m1.156s
sys     0m0.108s

$ time python perf-script

real    2m24.120s
user    0m1.102s
sys     0m0.098s

$ time python perf-script

real    2m21.521s
user    0m1.154s
sys     0m0.091s

This measures at 140 sec/req or 7.05 req/sec!

Note: since I am using Python 3.6 I had to modify the file /opt/rh/rh-python36/root/lib64/python3.6/ to read:

# Used by http.client if no context is explicitly passed.
_create_default_https_context = _create_unverified_context # this disables HTTPS cert validation

The issue has been reported in RHBZ #1643454

Happy testing!