Bug 450880

Summary:	[Wayland] If window preview is enabled, RAM usage quickly increases while I hover over the task manager
Product:	[Plasma] plasmashell	Reporter:	Patrick Silva <bugseforuns>
Component:	generic-performance	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	blaueshawaiihemd, jlp, kde, nate, qydwhotmail
Priority:	NOR	Keywords:	efficiency-and-performance
Version First Reported In:	5.27.5
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Patrick Silva 2022-02-26 14:27:27 UTC

STEPS TO REPRODUCE
1. add Memory Usage widget to desktop
2. have grouped and non-grouuped apps in the task manager
3. minimize all windows
4. repeatedly hover over each entry in the task manager and observe the RAM usage reported by the widget placed on desktop

OBSERVED RESULT
RAM usage reported by the widget quickly increases despite System Activity (ctrl+esc) does not show any app/proccess consuming more RAM during the steps above. On my system, Plasma even crashes at some point while I hover over the task manager, and then the RAM usage immediately returns to normal.

EXPECTED RESULT
observed result should not occur

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.24.80
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
Graphics Platform: Wayland

Comment 1 Nate Graham 2022-03-20 13:37:52 UTC

That's very strange. I cannot reproduce the issue.

Comment 2 Patrick Silva 2022-05-19 18:52:09 UTC

RAM usage increases even faster on Plasma 5.25 beta.

Operating System: Arch Linux
KDE Plasma Version: 5.24.90
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.4
Graphics Platform: Wayland

Comment 3 David Edmundson 2022-06-17 08:35:18 UTC

Please can you try to get a log in heaptrack

Comment 4 Patrick Silva 2022-06-27 14:10:05 UTC

(In reply to David Edmundson from comment #3)
> Please can you try to get a log in heaptrack

Done. You can download the log in the following link

https://www.mediafire.com/file/sz78o1cv4r4esz6/heaptrack.plasmashell.13719.zst/file

Comment 5 David Edmundson 2022-06-27 14:34:35 UTC

That's not showing a leak, 115Mb peak.
Nothing too abnormal.

It could be that heaptrack won't show shared memory that we allocate that way and given it's related to thumbnails is a plausible place to look.

Comment 6 Patrick Silva 2022-09-17 17:26:48 UTC

It's still reproducible.

Operating System: Arch Linux
KDE Plasma Version: 5.25.90
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
Graphics Platform: Wayland

Comment 7 Patrick Silva 2022-10-31 13:31:50 UTC

Memory Usage widget reports that used RAM increases ~300 MiB when I hover over gtouped Konsoles and then decreases ~300 MiB too when mouse pointer leaves the Plasma panel.

Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.26.80
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7
Graphics Platform: Wayland

Comment 8 Nate Graham 2022-10-31 18:23:32 UTC

I can reproduce that now.

Comment 9 Patrick Silva 2023-05-12 16:30:02 UTC

Can reproduce as explained in comment 7 even if the preview are disabled.

Operating System: Arch Linux 
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Graphics Platform: Wayland

Comment 10 Nate Graham 2025-10-23 18:54:57 UTC

Is this still happening in Plasma 6.5 or later, Patrick?

Comment 11 Patrick Silva 2025-10-23 21:28:04 UTC

Cannot reproduce anymore. \o/

Operating System: Arch Linux 
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Graphics Platform: Wayland