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.scho...@stadt.wolfsburg.de> > <burghardt.scho...@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.scho...@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 >> > > > _______________________________________________ > QGIS-Developer mailing list > QGIS-Developer@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer