OpenGL Application makes Xorg leaks
Multi tool use
OpenGL Application makes Xorg leaks
I am working on a rather big Qt5/OpenGL application.
Each time the application run and exit on a linux with nvidia driver, with a compositor active, nvidia-smi shows an increase of 4Mb of VRAM usage for Xorg process.
My suposition would be that even if my application leaks, everything should be released when it is destroyed, but it does not seems to be the case.
On this thread OpenGL GPU Memory cleanup, required?, Someone mentionned that it would not be the case if "Display list" are shared.
I do not know much about OpenGL, and could not find coherent informations about this issue on the web.
My objective is to understand how this could happen, where it may come from in my code and how to fix it.
Note :
The leaks are present in Xorg after my Aplication is stopped and no other process then Xorg and Desktop Environnement related are shown in nvidia-smi
The DE I use does not matter (tested : KDE, Lxde, OpenBox, Gnome, Unity).
The Linux Distribution I use (almost) does not matter (tested: Ubuntu 16.04, Ubuntu 18.04, fedora 26) (not reproduced on ArchLinux yet, we are still investigating this)
The nvidia driver version does not matter, tested 340, 384, 390.
This is a good remark. Yes I'm sure of that.
– Mathieu Westphal
Jul 1 at 13:17
I have updated my questions. Leaks disappear if compositor is not active
– Mathieu Westphal
Jul 1 at 13:40
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Just to get the insidious "argh, why didn't I notice that?" out of the way: Are you sure, your process actually terminates? It often happens that one forgets to actually terminate the main event loop/process, despite the last window being closed.
– datenwolf
Jul 1 at 11:56