[QGIS-Developer] [Server] Is QGIS Server 3 fast yet ? the 2018-02-06

[Régis Haubourg]

Hi René Luc,
thanks a lot for starting that analysis!

Do you plan to be in Madeira? Elaborating a complete test suite together
would be perfectly fitted for that task .

Some questions:

- Trust option is only there to not query datasource when this one has no
metadata for PK and extent. So it should only make sense to compare the
first getcapabilities or project load with and without trust option. Other
following requests should not have any impact, so we need to make sure the
platform is not measuring something else in the differences you note. So I
don't see what you mean by "completing" the trust option. Can you be more
explicit ?

- Is the test  platform requesting wms layer groups, and did you test the
multithread rendering? How many cores? How many cores really available when
testing?

I think we should first elaborate a common reference test suite and couple
a system monitoring at the same time to be sure we don't have external
noise in the tests, and find system bottlenecks. Then only we can consider
some conclusions over development priorities I think.

Many thanks !

Régis




2018-02-08 15:19 GMT+01:00 René-Luc Dhont <rldhont at gmail.com>:

> Hi Devs,
>
> I have made some analyse of the performances data generated by CampToCamp
> test platform.
> The data are downloadable here https://gmf-test.sig.cloud.
> camptocamp.net/ms_perfs/
> And the tests are based on this docker-pull:
> https://github.com/camptocamp/ms_perfs
>
> The QGIS Server docker used for these tests are based on the Kartoza one
> updated by CampToCamp
> https://github.com/kartoza/docker-qgis-server It is based on Apache
> Server and FCGI.
>
> The data comes from OpenStreetMap and are stored in a PostgreSQL/PostGIS
> database.
> One type of request is tested, GetMap. Varoious number of simultaneous
> users and various scale
> are tested.
>
> To give an answer to the question : Is QGIS Server 3 fast yet ? , I only
> used the values for 10 simultaneous
> users.
>
> If the reference to the question is QGIS Server 2: QGIS Server 3 is NOT
> faster even with the trust option activated in the project.
> QGIS Server 3 is always slower than QGIS Server 2, when only one layer is
> requested.
> In the tests, QGIS Sever 3 is faster than QGIS Server 2 with multi-layers
> and complex styles.
>
> This result can be easily explain by the new way QGIS Server is loaded
> project. QGIS Server 3 uses the QgsProject class, so all the
> project : layers and layouts are loaded even if only one layer is
> requested.
>
> About the trust project option, the results are a little bit disappointing.
> The performances are not always better than without.
> For higher scale (1° by 800px), requests are slower, but for lower scale (
> 0.015625° by 800px), they are faster.
>
> Now if we consired GeoServer-jai as a reference, QGIS Server 3 is slower
> in lower sacle (0.03125° by 800px)
> Now if we consired Mapserver as a reference, QGIS Server 3 is slower!
>
> We have to test some configuration:
> * disable simplify local
> * change simplify max scale
>
> Points of enhancement have to be explored :
> * Faster QgsProject loading based on project parsing
> * Simplify configuration at layer level
> * Completing trust option
>
> Regards,
> René-Luc
> * Enhance simplification
>
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