[QGIS-Developer] Memory Leak / Slowdown?

[Drexel Peter]

Hi Matthias,
yes, the same with a clean new profile.
4 iterations per second at the begining, 1 very 6 seconds at the end…

<QgsMapLayer: 'nix 1 13:08:41' (ogr)>
<QgsMapLayer: 'nix 2 13:08:41' (ogr)>
<QgsMapLayer: 'nix 3 13:08:41' (ogr)>
<QgsMapLayer: 'nix 4 13:08:42' (ogr)>
<QgsMapLayer: 'nix 5 13:08:42' (ogr)>
<QgsMapLayer: 'nix 6 13:08:42' (ogr)>
<QgsMapLayer: 'nix 7 13:08:42' (ogr)>
<QgsMapLayer: 'nix 8 13:08:43' (ogr)>
…
<QgsMapLayer: 'nix 397 13:25:38' (ogr)>
<QgsMapLayer: 'nix 398 13:25:45' (ogr)>
<QgsMapLayer: 'nix 399 13:25:51' (ogr)>






QGIS-Version


3.12.1-București


QGIS-Codeversion


121cc00ff0<https://github.com/qgis/QGIS/commit/121cc00ff0>


Kompiliert gegen Qt


5.11.2


Laufendes Qt


5.11.2


Kompiliert mit GDAL/OGR


3.0.4


Läuft mit GDAL/OGR


3.0.4


Kompiliert mit GEOS


3.8.1-CAPI-1.13.3


Läuft mit GEOS


3.8.1-CAPI-1.13.3


Kompiliert mit SQLite


3.29.0


Läuft mit SQLite


3.29.0


PostgreSQL-Client-Version


11.5


SpatiaLite-Version


4.3.0


QWT-Version


6.1.3


QScintilla2-Version


2.10.8


Kompiliert mit PROJ


6.3.1


Läuft mit PROJ


Rel. 6.3.1, February 10th, 2020


BS-Version


Windows 10 (10.0)


Aktive Python-Erweiterungen


db_manager;
MetaSearch;
processing





Von: Matthias Kuhn <matthias at opengis.ch>
Gesendet: Montag, 20. April 2020 12:50
An: Drexel Peter <Peter.Drexel at vorarlberg.at>; qgis-user at lists.osgeo.org
Betreff: Re: [QGIS-Developer] Memory Leak / Slowdown?


Hi Peter,

Did you try this on a clean new profile with no plugins installed?

Bests

Matthias
On 4/20/20 11:08 AM, Drexel Peter wrote:
Hi,
I use a Python-Script to load all shapefiles in a directory tree one by one and export the sld-files.
It works fine, but slows down incredible after ~100 files.
So I tried the following barebone script with just the essentials  (load shapefile, add it to the map canvas, remove it again and then clear the project) in a loop and I get the same behavior…

from datetime import datetime
for i in range(1, 1000):
                vlayer=QgsVectorLayer ("aShapeFile.shp" ,"run  " + str(i) + " at " + datetime.now().strftime('%H:%M:%S') ,"ogr")
                QgsProject.instance().addMapLayer(vlayer)
                QgsProject.instance().removeMapLayer(vlayer.id())
                QgsProject.instance().clear()

Same result,  the Script slows down after every iteration in the loop AND QGIS-memory consumption goes up!
Do I need to do some garbage cleaning / what am I doing wrong / is this a Memory leak?

Thanks everybody for any hints / help!

Peter




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