Bug 477976 - system-monitor incorrectly reports CPU usage as 0% when it is close to 100%
Summary: system-monitor incorrectly reports CPU usage as 0% when it is close to 100%
Status: RESOLVED FIXED
Alias: None
Product: plasma-systemmonitor
Classification: Applications
Component: general (other bugs)
Version First Reported In: 5.90.0
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: KSysGuard Developers
URL:
Keywords: qt6
Depends on:
Blocks:
 
Reported: 2023-12-03 09:33 UTC by Nick Korotysh
Modified: 2023-12-21 00:02 UTC (History)
4 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
htop vs system-monitor (749.43 KB, image/png)
2023-12-03 09:33 UTC, Nick Korotysh 		Details
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Description Nick Korotysh 2023-12-03 09:33:46 UTC 
Created attachment 163806 [details]
htop vs system-monitor

SUMMARY
***
when all core are under high load (close to 100%), system monitor displays 0% CPU usage (both for total and per core)
***


STEPS TO REPRODUCE
1. open system monitor or add widget displaying CPU usage
2. run CPU-heavy task, for example compilation or 7z benchmark (7z b 10)
3. compare usage in system monitor and htop

OBSERVED RESULT
CPU usage is 0%, only sometimes reaches 100% for some core

EXPECTED RESULT
CPU usage is close to 100% for all cores

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: ArchLinux/KDE Plasma 6 Beta, Wayland
KDE Plasma Version: 5.90.0
KDE Frameworks Version: 5.246.0
Qt Version: 6.6.1

ADDITIONAL INFORMATION
not 100% usage seems to be reported correctly, see attached screenshot
Comment 1 Nick Korotysh 2023-12-21 00:01:29 UTC 
fixed in 5.91, can be closed