[QGIS-Developer] QGIS Server 3 status

[David Marteau]

Hi

According to the source https://github.com/qgis/QGIS/blob/master/src/server/qgsserversettings.cpp#L47: setting QGIS_SERVER_PARALLEL_RENDERING to False or not setting QGIS_SERVER_PARALLEL_RENDERING is the same thing as the default value is 'false'.

Using the appropriate log level you can get metric on the rendering time from qgis: imho, comparing this metric would be a good starting point putting aside external configuration (except for the postgres connection) and isolate any bottleneck. 

David.

> Le 9 oct. 2017 à 11:53, <Burghardt.Scholle at stadt.wolfsburg.de> <Burghardt.Scholle at stadt.wolfsburg.de> a écrit :
> 
> 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
>> 
> 
> 
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