[Qgis-developer] Server features
Marco Hugentobler
marco.hugentobler at sourcepole.ch
Wed Nov 14 12:13:44 PST 2012
Hi all
Performance is a complex topic, it essentially depends what you are
testing ( few complex polygons, many small polygons, type of raster,
lots of labels, ...).
I'm regularly profiling some of my important server projects (e.g. WMS
of cadastral survey). One thing that takes up a lot of render time is
the drawing of the labels (only the rendering, not the placement).
I think this is because they are rendered using QPainterPath and not
with QPainter->drawText (but it might be difficult to render the buffer
using drawText).
And don't forget that normally the transfer of the image over the
internet takes more time than the WMS rendering itself. So don't forget
to use jpg for rasters and the improved png8 for vectors. It can improve
perceived performance by a factor of 3 or 4.
Regards,
Marco
On 14.11.2012 19:57, Andreas Neumann wrote:
> Lets say that speed of QGIS Server is good enough for most of my
> projects. But it could be faster for more complex rendering and labeling.
>
> UMN feels faster than QGIS Server - but I don't have time for double
> configurations for desktop and web. Plus - it is so much easier to
> configure QGIS projects compared to editing mapfiles.
>
>
>
> "G. Allegri" <giohappy at gmail.com> schrieb:
>
> 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?
>
> I would also add a point to the whishlist: Qgis Server Python API ;)
>
> giovanni
>
> 2012/11/14 kimaidou <kimaidou at gmail.com <mailto:kimaidou at gmail.com>>
>
> Hi
>
> 2012/11/14 Vincent Picavet <vincent.ml at oslandia.com
> <mailto: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
> <mailto: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
> > >> _______________________________________________
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--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
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