https://bugs.kde.org/show_bug.cgi?id=497341
Bug ID: 497341
Summary: Individual Core Usage incorrectly shows 100% CPU
usage, disagreeing with htop and System Monitor
Classification: Plasma
Product: plasmashell
Version: git-stable-Plasma/6.2
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: and...@ziglang.org
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
Created attachment 176536
--> https://bugs.kde.org/attachment.cgi?id=176536&action=edit
screenshot
SUMMARY
Individual Core Usage shows wrong data sometimes, incorrectly marking
applications as 100% CPU usage when they are idle. Please audit its logic to
make sure it matches System Monitor and htop.
This was brought up here and incorrectly dismissed:
https://discuss.kde.org/t/individual-core-usage-doesnt-match-top-by-a-lot/9232
STEPS TO REPRODUCE and OBSERVED RESULT
1. Wait for the public release of Ghostty, scheduled for December 31, 2024, or
ask Mitchell Hashimoto for a private beta invitation.
2. Follow the steps in the README of that project to build from source.
3. Run the ghostty binary and observe 2 apparently pegged CPU cores per open
window.
4. Run htop and notice ghostty actually is idle.
5. Run System Monitor and notice ghostty is actually idle.
EXPECTED RESULT
No bars shown in the Individual Core Usage widget when the app is idling.
SOFTWARE/OS VERSIONS
Operating System: NixOS 24.11
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.0
Kernel Version: 6.12.3 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 7950X 16-Core Processor
Memory: 62.0 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XTX
ADDITIONAL INFORMATION
I observed this also in Plasma 5, before upgrading to Plasma 6.2.
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