Arch Linux

archqt

Member

Registered: 2015-04-29

Posts: 180

[KDE5] plasmashell and app take too much CPU

Hi,
on KDE Plasma, sometimes plasmashell and other applications takes too much CPU. Plasmashell can take up to 60% of the CPU. And something better i did some applications using Qt, one which use QML and the same with QWidgets and the results are :
KDE QML up to 50% CPU QWidgets 5%
lxqt QML 5% and QWidgets less than 1%

On KDE and on lxqt i opened exactly the same applications (chromium with, i know it is a lot, 30 tabs on it). I noticed that memory was high on KDE, it used all the 8Go i have.
On lxqt same programs opened it uses only 4.8Go on memory.
When i close all this programs i have 750Mo use on KDE and about 400Mo on lxqt (don't remember exactly sorry but it is less than 500Mo). So when i open chromium with my tabs KDE use more memory (but it seems like chromium use same on both system)....
Maybe system on KDE freezes because of no more memory on it.
Sincerely

PS if i open KDE with OpenBox instead of plasma it works better (same as lxqt in term of memory)

It seems that the problem is that KDE or Applications take all memory

Last edited by archqt (2016-08-20 21:49:27)

Ravior

Member

From: Galați, Romania

Registered: 2013-01-10

Posts: 39

Re: [KDE5] plasmashell and app take too much CPU

I've seen seen this problem on one of my older machines that has an Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz. Somehow the CPU remains to stay above 50-60% for all threads no matter what applications are opened. It's true however that I haven't give this much thought or try to debug it...
That being said, have you searched the KDE's Bugzilla if there is an opened ticket for this?

Last edited by Ravior (2016-08-21 22:50:58)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,657

Re: [KDE5] plasmashell and app take too much CPU

Do you use a plasmoid that refreshes often? I.e. cpu/ram monitor or similar? Do you have an application open that has a dynamically updating icon in the tray? Most of these issues should be fixed, but maybe there's still a bug in that direction.

Potomac

Member

Registered: 2011-12-25

Posts: 528

Re: [KDE5] plasmashell and app take too much CPU

a good test : log to KDE with a new user account and see if the bug is still here,

if the bug disapears then it's a configuration problem in your ~/.config

Last edited by Potomac (2016-08-22 12:29:49)

archqt

Member

Registered: 2015-04-29

Posts: 180

Re: [KDE5] plasmashell and app take too much CPU

a good test : log to KDE with a new user account and see if the bug is still here,

if the bug disapears then it's a configuration problem in your ~/.config

Hi,
it seems better one the new user.
I delete all plasma* files and i just keep plasma-org.kde.plasma.desktop-appletsrc to have icons on Desktop
I will try if everything works better now.
thanks
Sincerely

Last edited by archqt (2016-08-26 14:10:00)

archqt

Member

Registered: 2015-04-29

Posts: 180

Re: [KDE5] plasmashell and app take too much CPU

Hi,
finally it is the same. Plasmashell take up  to 80% of CPU. it comes when "chromium" take all memory. I know Chromium is a "shit" for memory. So with 6 tabs that uses streaming, and flash it consumes all the memory...
Thanks

archqt

Member

Registered: 2015-04-29

Posts: 180

Re: [KDE5] plasmashell and app take too much CPU

Hi,
for people who have same problem than me. For now i m testing lxqt-git which works nice and use less memory and less CPU. Maybe later when this bug will be resolved i will try kde later.
Thanks for the reply
Sincerely

Ketchup901

Member

Registered: 2016-05-18

Posts: 47

Re: [KDE5] plasmashell and app take too much CPU

I'm also having this issue. I know Plasma is very heavyweight but I'd rather not switch.
If I reboot it's fine for maybe an hour or so.

Although if I do switch what would be the DE that's most like Plasma?

edit: also what's the config files that when removed would solve the problem?

Last edited by Ketchup901 (2016-10-24 18:50:38)

seth

Member

Registered: 2012-09-03

Posts: 51,024

Re: [KDE5] plasmashell and app take too much CPU

Likely some plasmoid is going wild. Also the kio indicators (copy/move) are known to cause this. The reason is an insane QML fps rate (infinite) or sometimes bad QML code (it's prone to cause recursions across the eventloop because of the not-so-robust anchor concept)

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