https://bugs.kde.org/show_bug.cgi?id=470026
Bug ID: 470026
Summary: kactivitymanagerd pegs a CPU core at 100% when
downloading files from Firefox
Classification: Plasma
Product: kactivitymanagerd
Version: 5.27.5
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: ivan.cu...@kde.org
Reporter: adam.m.fontenot+...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: ---
SUMMARY
I was downloading a bunch of files in Firefox - about 600 files at a rate of
about one file every three seconds. These were simple text files, almost all
around 20 KB (and none larger than 25 KB). So not an especially fast download
rate, and not especially large files. (These files were all going in
~/Downloads. I have Baloo completely disabled.)
This resulted in a very small CPU increase in Firefox itself, but when trying
to figure out why my fans went crazy, I noticed that kactivitymanagerd had a
core at 100% for the duration of the download (~30 minutes).
STEPS TO REPRODUCE
1. Download a bunch of small text files in Firefox.
DEBUGGING
I didn't manage to get a flame graph, but did some quick debugging during the
download process with `strace`. Things I noticed:
* The following syscall occurred 18580 times over the course of a 1-2 minute
`strace`:
newfstatat(AT_FDCWD, "/etc/localtime", {st_mode=S_IFREG|0644, st_size=3552,
...}, 0) = 0
* The most significant activity seems centered around
`~/.local/share/recently-used.xbel`. There are about 1000 bookmarks in this
file, and `kactivitymanagerd` is reading from it off and on throughout the
entire `strace`. Since it's an XML file I assume there is probably a
considerable amount of parsing being done on the file that doesn't show up in
the `strace`. It's not clear to me what `kactivitymanagerd` is doing with the
data from this file.
* Most of the rest of the syscalls are related to XDG paths, like
`~/.local/share/applications`.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 6.3.2-arch1-1 (64-bit)
Graphics Platform: X11
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