[frameworks-kio] [Bug 398908] MimeTypeFinderJob can use huge amounts of memory reading unnecessary data

[Knut Hildebrandt]

https://bugs.kde.org/show_bug.cgi?id=398908

--- Comment #101 from Knut Hildebrandt <knut.hildebrandt at gmx.de> ---
(In reply to Harald Sitter from comment #100)
Sorry for the late reply, I was out of town for a while.

> Is that actually the same defect though?
I do not know, but it at least the same behavior I described in my first bug
report. All dolphin instances use up more and more memory over time,
particularly if the system has been suspended or hibernated various times. 

> When you start from a new dolphin and click a super large file, like say an
> ISO, does the consumption jump up and stay high even after the file is fully
> opened?

Just restarted the machine after having to shut it down since dolphin used up
to 4 GB of memory. After the restart I opened an extra instance an started a
3.2 GB movie. When I started the movie the respective dolphin instance used at
bit more than 20 MB and slowly gained 10 MB until the movie finished. Meanwhile
some of the other dolphin instances had gained more than 100 MB each. The ones
showing the highest memory usage at the same time show the highest CPU time -
up to 3:50 over two hours - too, whereas the one I used to start the movie only
has 0:21.

Maybe I should mention that all instances showing high memory usage and CPU
time have several tabs and split view, only the one opened to start the movie
has a single tab and simple view.

Well, I got the impression that my description of the behavior does not help to
narrow down the problem. What data could be more helpful and how can I retrieve
it? 

Operating System: Manjaro Linux
KDE Plasma Version: 5.22.4
KDE Frameworks Version: 5.84.0
Qt Version: 5.15.2
Kernel Version: 5.10.56-1-MANJARO (64-bit)
Graphics Platform: X11

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