https://bugs.kde.org/show_bug.cgi?id=459288
Bug ID: 459288
Summary: Uses lots of CPU power
Classification: Unclassified
Product: frameworks-kactivities
Version: 5.97.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: ivan.cu...@kde.org
Reporter: kdebuac....@porcupinefactory.org
CC: plasma-b...@kde.org
Target Milestone: ---
SUMMARY
kactivitiesd and/or plasmashell will go crazy when switching activities and
consume 100% of a core for a few seconds to (in a congested system) a few
minutes, making plasma stop responding to input.
It seems related to the kactivity database at
.local/share/kactivitymanagerd/resources/database.
According to perf, the culprit is a lot of reads via __libc_pread64 (46.75% +
34.12%), strace confirms.
The database file is 241M in size
STEPS TO REPRODUCE
1. Switch between activities by clicking on the panel widget
2. Switch again, quickly
OBSERVED RESULT
About 20% of the time, plasmashell freezes for a while, taking 100% CPU
Less than 20% of the time, kactivitymanagerd takes 100% CPU for some seconds
EXPECTED RESULT
Plasmashell never freezes.
Activities-related processing never utilizes 100% CPU for more than a fraction
of a second (I know activities are more than that, but I use them as virtual
desktops, which should be light).
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 36
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5
Kernel Version: 5.19.4-200.fc36.x86_64 (64-bit)
Graphics Platform: X11
Processors: 2 × Unknown Type, 2 × Intel® Core™ i5-3380M CPU @ 2.90GHz
Memory: 11.5 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 4000
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