[Qgis-developer] Timer issues with threaded rendering on Windows

Andreas Neumann a.neumann at carto.net
Sun Mar 2 23:38:05 PST 2014

Hi Martin,

The hangs are gone now with your fix. Also, the lag between feature
drawing and label drawing is much, much shorter now. Still noticeable
(as you also described) but very short.

The total rendering time is now subjectively shorter than before the
multi-threaded improvements.

Thank you for this fix.


Am 28.02.2014 09:29, schrieb Martin Dobias:
> Hi Andreas
> On Thu, Feb 27, 2014 at 10:58 PM, Andreas Neumann <a.neumann at carto.net> wrote:
>> Hi,
>> I am testing the threaded rendering on Windows 7, 64bit. Unfortunately, I
>> often get "hangs" and in the log I get messages like:
>> ...
>> QObject::startTimer: timers cannot be started from another thread
>> QObject::killTimer: timers cannot be stopped from another thread
>> ...
>> QGIS than hangs for a couple of seconds until I can navigate again. This
>> happens quite often.
> The warnings should be fixed now (2081fc). Please check again if you
> still have hangs.
>> I also notice there is a considerable lag between the rendering of features
>> and the labeling.
> This is because first you get the layers rendered, after that the
> labeling is started (especially with polygons the labeling may take
> quite some time compared to rendering). Or is the total time
> noticeable longer with master than with 2.2 ?
> Regards
> Martin

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