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

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

--- Comment #6 from tagwerk19 at innerjoin.org ---
(In reply to lemaitre from comment #5)
> ... 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.
I think, if you touch a file, Dolphin and thumbnail.so recreates the thumbnail;
it doesn't know that the content has not changed. If the thumbnail is
recreated, Dolphin reloads it. Can be that that's loads of work...

> As a sidenote, with 10'000 empty files in the folder, the refresh takes a
> few seconds.
It would be interesting to know if Dolphin knows it can skip looking for
thumbnails of empty files. I assume you are not on an HDD...

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