[dolphin] [Bug 440417] Really high CPU usage when many files are updated

[lemaitre]

https://bugs.kde.org/show_bug.cgi?id=440417

--- Comment #5 from lemaitre <kde.account at lemaitre.re> ---
(In reply to tagwerk19 from comment #4)
> (In reply to lemaitre from comment #3)
> > ... To be noted that the bug does not seem to appear at the file creation (even
> > creating 10 000 files in one go), but at the update of the files ...
> I noticed a difference between running
>  
>     touch testfile{00001..10000}
> 
> a first time and repeating it. Dolphin worked a little harder but it was
> still just a second or so of high CPU.
> 
> Baloo spent a while catching up with changes and baloo_file_extractor had a
> look at the "touched" files (in batches of 40). Nothing excessive though...
> 
> Could there be an issue with large numbers of thumbnails? (How big is
> .cache/thumbnails/normal?)

I disabled baloo, because it was too power hungry. The process that eats the
CPU is dolphin, its main thread to be precise.

Indeed, the .cache/thumbnails/normal was huge, more than 3 GB. So I deleted its
content. It seemed have made a difference, but only if I don't refresh dolphin
window.

But if I open a folder with many files, refresh it with F5, and then touch
every file from the terminal, I end up in the same high cpu load case as
before. The .cache/thumbnails/normal grew to 17MB and stopped there, so no
alarm on this side.

As a sidenote, with 10'000 empty files in the folder, the refresh takes a few
seconds.

-- 
You are receiving this mail because:
You are on the CC list for the bug.