https://bugs.kde.org/show_bug.cgi?id=493462
Bug ID: 493462
Summary: kwin with wayland excessive VRAM usage
Classification: Plasma
Product: kwin
Version: 6.1.5
Platform: Neon
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: xwayland
Assignee: kwin-bugs-n...@kde.org
Reporter: maxim.yegorush...@gmail.com
Target Milestone: ---
Created attachment 173947
--> https://bugs.kde.org/attachment.cgi?id=173947&action=edit
nvtop screenshot
I observe kwin with wayland using 5GB of VRAM while running a Plasma shell with
an Emacs and 3 Konsoles. Which looks a bit too excessive for me.
My research involves training lots of relatively small PyTorch models on a
single GPU in parallel. VRAM is a limiting resource for me, and getting more of
it is most expensive and non-trivial. That's why I keep an eye on VRAM usage.
OBSERVED RESULT
kwin with wayland use 5GB of VRAM (21% of 24GB) just to display a Plasma shell
with an Emacs and 3 Konsoles.
EXPECTED RESULT
kwin with wayland use well under 1GB VRAM for this use case.
SOFTWARE/OS VERSIONS
Operating System: KDE neon 6.0
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.8.0-45-lowlatency (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 5950X 16-Core Processor
Memory: 125.7 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4090/PCIe/SSE2
nvidia-driver-555
ADDITIONAL INFORMATION
nvidia-smi -q output (sometime earlier than nvtop screenshot):
...
Processes
Process ID : 2302
Type : G
Name : /usr/lib/xorg/Xorg
Used GPU Memory : 30 MiB
Process ID : 6113
Type : G
Name : /usr/bin/kwin_wayland
Used GPU Memory : 2326 MiB
Process ID : 6182
Type : G
Name : /usr/bin/Xwayland
Used GPU Memory : 2478 MiB
Process ID : 6217
Type : G
Name : /usr/bin/ksmserver
Used GPU Memory : 6 MiB
Process ID : 6233
Type : G
Name : /usr/bin/plasmashell
Used GPU Memory : 122 MiB
...
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