[Qgis-developer] Server features

[Vincent Picavet]

Hi,

> > The one thing were UMN Mapserver is a much better is performance. This
> > is where we should really catch up.
> 
> I would put this to the higher position! I don't know where the effort
> should be put, because I suppose it's something deep in the rendering
> engine of QGis. Do you see bottlenecks at the server level?

As for performances, the software stack used by QGIS is much fatter than the 
one used by Mapserver for instance. 
Using the QT framework is great for desktop applications, but degenerates 
performances when used in another context. Compared to QGIS, mapserver uses 
custom C implementation with thinner memory and computing resources 
management. This is valid for TinyOWS, mapcache and mapnik too.

Ways to overcome this could be :
* multithreading (but the catch-up will only work for a one-process 
architecture, mapserver can be parallelized since it's stateless)
* using GPUs : that's a big task to implement

This does not mean QGIS will alway be 10 times slower than mapserver and can't 
be improved, but it would be really surprised to see it keeping up with 
mapserver or mapnik performances.
 
Vincent

> I would also add a point to the whishlist: Qgis Server Python API ;)

> 
> giovanni
> 
> 2012/11/14 kimaidou <kimaidou at gmail.com>
> 
> > Hi
> > 
> > 2012/11/14 Vincent Picavet <vincent.ml at oslandia.com>
> > 
> >> Hi,
> >> 
> >> > * templates for HTML popups (already done this in Lizmap, but why not
> >> > having it in Qgis)
> >> 
> >> You mean accessing the templates through QGIS server ? Because html
> >> popups already are in QGIS :)
> > 
> > I mean through Qgis Server (in respect to this thread title ;)
> > Just exposing methods for the server must do it, as Andreas proposed.
> > 
> > We should have a look at PyWPS too, which could be an easy way to provide
> > 
> >> WPS
> >> services around QGIS API.
> > 
> > Yes, pyWPS could help provide this feature, but we still need a way so
> > that QGIS Server can use python plugins / processes, etc.. I remember
> > discussion about this during last hackfests, but I do not know if someone
> > gave it a try.
> > 
> > Anyway, +10000 for focusing on performance first, which is the key
> > "feature" for a Server.
> > 
> > Michael
> > 
> >> Vincent
> >> 
> >> > Good evening
> >> > Michael
> >> > 
> >> > 
> >> > 2012/11/14 G. Allegri <giohappy at gmail.com>
> >> > 
> >> > > > - integrated tiling
> >> > >> 
> >> > >> Why not integrating mapcache directly to mutualize effort on this
> >> 
> >> part ?
> >> 
> >> > >> Mapcache can be used standalone, and could read its parameters
> >> 
> >> directly
> >> 
> >> > >> from a
> >> > >> qgis configuration file. No need to reinvent the wheel here, or
> >> > >> would there be a
> >> > >> good reason to it ?
> >> > > 
> >> > > I think that a tile generator from the QGis Desktop side would
> >> 
> >> suffice.
> >> 
> >> > > Any other TMS/WMS-T server could use the tile structure.
> >> > > 
> >> > >> > - mask layers
> >> > >> 
> >> > >> That would be great to have in QGIS indeed. It would mean having
> >> > >> for each layer an attached mask layer, which is not displayed but
> >> > >> only
> >> 
> >> used
> >> 
> >> > >> to define
> >> > >> hidden places.
> >> > >> 
> >> > >> > - symbol placement
> >> > >> > - label offsets
> >> > >> 
> >> > >> That's for qgis symbology, not directly a qgis server issue. Label
> >> > >> offset in
> >> > >> mapserver definitly looks cool !
> >> > > 
> >> > > I agree Vincent.
> >> > > 
> >> > >> Vincent
> >> > >> _______________________________________________
> >> > >> Qgis-developer mailing list
> >> > >> Qgis-developer at lists.osgeo.org
> >> > >> http://lists.osgeo.org/mailman/listinfo/qgis-developer
> >> > > 
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