With the second command
iface.mapCanvas().setPreviewJobsEnabled(False)
when I run that command it drops back to 16 GB
On 16/11/17 23:15, Matthias Kuhn wrote:
Hi Patrick,
Would be interesting to do this test with previews enabled and
disabled. Then we'll see if it's actually the previews or some other
mechanism that is causing this.
IIRC only a composite image is saved in the preview jobs and not each
layer separately, but that's just what I remember and not evidence based.
You can enable them in the python console with
iface.mapCanvas().setPreviewJobsEnabled(True)
and disable with
iface.mapCanvas().setPreviewJobsEnabled(False)
Thanks for a feedback
Matthias
On 11/16/2017 08:42 AM, Patrick Dunford wrote:
In my current project using Qgis 2.99, turning off the rasters uses
16 GB, turning them on uses 52 GB
I do not believe it is independent from the number of layers that are
being displayed.
Previous versions of the software did not cache every single raster
(the number of rasters actually being displayed on the canvas at any
one time is a small fraction of the total number in the project)
On 16/11/17 20:11, Matthias Kuhn wrote:
Hi Patrick,
This uses some memory (~ canvas width pixels * canvas height pixels
* 8 preview images * 32 bit RGBA), so let's assume 50 MB to 100 MB.
This consumption is independent from the number or type of layers.
Matthias
On 11/16/2017 08:02 AM, Patrick Dunford wrote:
So to put it another way this is the reason why Qgis wants to use a
huge amount of memory (40 GB) when I have a lot of raster images
loaded in the background.
On 16/11/17 18:56, Tim Sutton wrote:
Hi
On 16 Nov 2017, at 04:35, Patrick Dunford
<[email protected] <mailto:[email protected]>> wrote:
What is this "preview job" function?
Its application logic to prefetch / pre-render offscreen content
in anticipation of user panning the map.
Regards
Tim
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