[Qgis-developer] Multi-threading rendering merged to master

Larry Shaffer larrys at dakotacarto.com
Mon Feb 24 14:55:07 PST 2014

Hi Martin,

This is just awesome work!

Unfortunately, all but the simplest labeling tests (default labels of mm
unit) fail, especially any that utilize labels in map units. In your
forthcoming detailed description of changes you mentioned, could you add
some info on what may have changed with regards to output resolution?

Sorry, I haven't read all previous list threads concerning your work yet.

I'm going to go back to a 2.2 build and work on a semi-complete suite of
labeling tests. Then, port the unit tests and control images to master, so
we can see the differences between then and post-multi-threading commits.

For now, labeling output is ~90% broken, resolution-wise, across all



On Mon, Feb 24, 2014 at 2:27 AM, Martin Dobias <wonder.sk at gmail.com> wrote:

> Hi Mathieu
> On Mon, Feb 24, 2014 at 9:52 AM, Mathieu Pellerin <nirvn.asia at gmail.com>
> wrote:
> > Martin,
> >
> > Fantastic work; I knew to expect a better rendering experience, yet I was
> > caught by surprise at how much of a positive difference it makes.
> >
> > Few things from my 10-minutes play with it:
> > * The map overview extend is broken, its extend goes way, way beyond the
> > extend of the sum of all the layers in a given project
> In my quick test everything seems to work fine, I will need more
> details about the issue - feel free to file a bug report.
> > * The 'xxx' option doesn't seem to be taken into consideration, the
> parallel
> > rendering is always activated on my machine irrespective of whether I
> > checked the box or not.
> Works fine for me... but there are two different concepts:
> 1. rendering in background - GUI is responsive even while the map is
> being rendered - this is always on
> 2. parallel vs sequential rendering - in sequential mode, there is
> just one job that renders everything - in parallel mode, the job is
> split into several jobs (one job per map layer) and jobs can therefore
> use multiple cores
> Are you sure you are not referring to point 1?
> Also, it is worth noting that parallel rendering may bring
> improvements only when there is more than one layer to render.
> > * Half of the times I exited QGIS, the application process was not
> > terminating and this error message was thrown: "*** Error in
> > `/home/webmaster/apps/bin/qgis': corrupted double-linked list: 0x0a0680f0
> > ***"; I had to manually kill the process
> I had this problem too - due to some garbage in the build directory
> (incompatible plugin DLLs). Try to run QGIS with --noplugins option.
> But better do a clean build.
> Regards
> Martin
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