https://bugs.kde.org/show_bug.cgi?id=435477
Bug ID: 435477
Summary: High polling rates misreport CPU usage as 0% with
spikes
Product: ksysguard
Version: 5.21.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: ksysguard
Assignee: ksysguard-b...@kde.org
Reporter: zgoethe...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: ---
Created attachment 137411
--> https://bugs.kde.org/attachment.cgi?id=137411&action=edit
Comparing the KSysGuard output to htop, which shows the expected CPU usage.
SUMMARY
When the "System Load" tab has a polling rate any faster than 0.5s, CPU load
reports as 0% with occasional spikes. Running a system stress results in
occasional spikes of 100%. The graph draws correctly if the window is rapidly
resized.
https://www.youtube.com/watch?v=bkeOvN3hOH0
STEPS TO REPRODUCE
1. Use KDE Plasma/Arch kernel 5.12rc
2. Run all-core stress test
3. Set "System Load" tab to refresh every 0.01s
OBSERVED RESULT
CPU usage is reported as 0% with occasional momentary spikes to 100%.
EXPECTED RESULT
CPU usage should be pegged at 100% as reported in htop.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.12.3
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
Kernel 5.12.rc.d0314.g1e28eed-1
AMD Radeon RX 570 4GB
Compositor in OpenGL mode
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