I understand (especially with the other comments about the functionality
and having to wait for images to be retrieved from servers) what you
guys are trying to achieve with this feature, but in my project the
rasters I have loaded cover hundreds of square kilometres, and Qgis
caches all of them, regardless of how far they are from the particular
point where I am working on a map.
On 17/11/17 21:56, Alessandro Pasotti wrote:
Maybe a crazy idea, but if this proves to be an issue, what about a
monitoring process that prompts the user to disable this feature when
memory goes over a certain threshold?
On Fri, Nov 17, 2017 at 8:21 AM, Patrick Dunford
<[email protected] <mailto:[email protected]>> wrote:
Most of them are geoJpeg, there are a smaller number of geoTiff
On 17/11/17 20:10, Matthias Kuhn wrote:
Thanks, that's an interesting information.
What datatype are your rasters?
On 11/17/2017 03:53 AM, Patrick Dunford wrote:
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
_______________________________________________
QGIS-Developer mailing list
[email protected]
<mailto:[email protected]>
List info:
https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
Unsubscribe:
https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
—
*Tim Sutton*
*Co-founder:*Kartoza
*Project chair:*QGIS.org <http://QGIS.org>
Visit http://kartoza.com <http://kartoza.com/> to find out
about open source:
Desktop GIS programming services
Geospatial web development
GIS Training
Consulting Services
*Skype*: timlinux
*IRC:*timlinux on #qgis at freenode.net <http://freenode.net>
_______________________________________________
QGIS-Developer mailing list
[email protected]
<mailto:[email protected]>
List info:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
_______________________________________________
QGIS-Developer mailing list
[email protected]
<mailto:[email protected]>
List info:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
_______________________________________________
QGIS-Developer mailing list
[email protected]
<mailto:[email protected]>
List info:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
_______________________________________________
QGIS-Developer mailing list
[email protected]
<mailto:[email protected]>
List info:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
_______________________________________________
QGIS-Developer mailing list
[email protected]
<mailto:[email protected]>
List info:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
_______________________________________________
QGIS-Developer mailing list
[email protected]
<mailto:[email protected]>
List info:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
_______________________________________________
QGIS-Developer mailing list
[email protected] <mailto:[email protected]>
List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
Unsubscribe:
https://lists.osgeo.org/mailman/listinfo/qgis-developer
<https://lists.osgeo.org/mailman/listinfo/qgis-developer>
--
Alessandro Pasotti
w3: www.itopen.it <http://www.itopen.it>
_______________________________________________
QGIS-Developer mailing list
[email protected]
List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
