[QGIS-Developer] QGIS Server 3 status

[Burghardt.Scholle at stadt.wolfsburg.de]

Hi David,

I will answer you directly and give you the desired information. I've done some tests with a sample application, which you can see under the URL https://lxgis1.stadt.wolfsburg.de/qgis_wcl/index.html.
The map topic "Stadtplan" is based on the qgis server 2.14.19, the "Stadtplan (Dev)"-topic is based on qgis server 2.99 (codeversion 825a323). Subsequent tests I've done with the layers "Luftbilder" and "Infrastruktur". The former are geotiff's, the latter are generated from a PostGIS database. As client I use a customized version of the "OL3 Mobile Client" from Sourcepole.

If I look at the access times in the developer tools of the Firefox, they speak a clear language:
- Topic "Stadtplan" -> moving the map, zoom in / zoom out takes about 0.5 s on the intranet (!)
- Topic "Stadtplan (Dev)" -> moving the map, zoom in / zoom out takes about 1.2 s with the setting "FcgidInitialEnv QGIS_SERVER_PARALLEL_RENDERING False" in my apache config
- Without setting "FcgidInitialEnv QGIS_SERVER_PARALLEL_RENDERING False" the access takes about 0.7 s
Result: without using multiprocessing / multithreading, the QGIS server is faster under these test conditions, but still clearly slower than the older version!

Hope this description helps

Burghardt

***************

Burghardt Scholle
mailto:burghardt.scholle at stadt.wolfsburg.de

>Hi,
>
>Do we have metrics on this ?  Does it mean  that QGIS_SERVER_PARALLEL_RENDERING=False is also slower than previous version ?
>
>
>David M.
>
>
>
>> Le 4 oct. 2017 à 14:15, Matthias Kuhn <matthias at opengis.ch> a écrit :
>> 
>> Hi,
>> 
>> I had some questions from people interested in performance.
>> 
>> I advised them to set the following
>> 
>> * QGIS_SERVER_PARALLEL_RENDERING=True
>> * Trust project flag
>> 
>> Apparently parallelized rendering works (system stats) but it was
>> reported to be slower than older versions.
>> 
>> Is there something else that needs to be done? Is there more information
>> I can ask for / give?
>> 
>> Thanks a lot
>> Matthias
>