KDE 4.8 - Dolphin terrible thumbnails handling

painteru · Tux's lil' helper Joined: 23 Aug 2007 Posts: 103

Hi there!
My problem is that Dolphin works very slow and odd with thumbnails since I upgraded my system to KDE-4.8 version .
I don't know how to describe in words its behavior so I made a short video showing how it works.
Here is the youtube clip.
http://youtu.be/r9hihxdREkc
Any help is much appreciated.
Thanks,
Daniel
_________________
My art at www.danielchiriac.com

asturm · Developer Joined: 05 Apr 2007 Posts: 8938

Afaik dolphin was completely rewritten in 4.8 - to be faster.

Seems that didn't work out for thumbs. But 4.8.1 will be released on March 6th, so if you're lucky your bug will be fixed by then.

franzf · Advocate Joined: 29 Mar 2005 Posts: 4565

just watch "top" when that happens again. I am sure you will see eather virtuoso-t or nepomuk eating tons of cpu. Watch iotop, there will be big load, too.
If so, it's known and partially fixed in 4.8.1. Partially, because they found out there are several ways to trigger the issue, and they fixed one (or now more).
https://bugs.kde.org/show_bug.cgi?id=289932
I experienced exactly the same problem (icons loading EXTREMELY slowly) as you described, and the radical way "delete nepomuk config + data" helped.
If this is NOT the issue, we need to find out, if there is a report, yet

painteru · Tux's lil' helper Joined: 23 Aug 2007 Posts: 103

Hi,
Thank you very much for your fast replay.

genstorm , I hope 4.8.1 will correct this.

Franz Ferdinand, well... I disabled nepomuk indexer yet I left activated nepomuk semantic desktop . So when I open Dolphin #top shows on top only Dolphin and kio-thumbnail. Virtuoso and the other nepomuk stuff related is no higher the the 6th place on top

Well, to say the whole truth, the whole 4.8 KDE performs worst then the previous version !!
Power control works by its "free will" and turn off my display even that I set it to stay on always...
Also, there are 2 icons on the task bar (konqueror and dolphin shortcuts) which are there by default and if I deleted them they appear back after a new logon ..
And maybe there are more issues but these are the most annoying and the most of these is the dolphin thumbnails issue.
_________________
My art at www.danielchiriac.com

franzf · Advocate Joined: 29 Mar 2005 Posts: 4565

Is there something unusual in dmesg or ~/.xsession-errors?
You can run tail -f ~/.xsession-errors then start dolphin and watch live what gets dumped to .xsession-errors.
You can check, if dolphin and kio_thumbnail post their messages. Run "kdebugdialog", filter for dolphin and thumbnail, check the checkboxes, then you are sure that errors will make their way to .xsession-errors.

franzf · Advocate Joined: 29 Mar 2005 Posts: 4565

Cross-post:
http://forum.kde.org/viewtopic.php?f=224&t=99639

painteru · Tux's lil' helper Joined: 23 Aug 2007 Posts: 103

Hi,
I've just upgraded kde to KDE-4.8.1
Well, things are the same.
The only way I can ameliorate that behaviour is to uncheck the "preview - directories" dolphin option.
If that is done, thumbnails are rendered much faster ... Yet, it's still annoying because of the way how dolphin renders the thumbnails in steps:
- 1th step, there are rendered thumbnails ordered by name
- 2nd, thumbnails are ordered by type.
This thing is very annoying on large directories filled with different files types .

FranzF, I don't know if it's something unusual on my .xsession-errors files but if there's someone to know how to read it, this is it on pastebin.com
http://pastebin.mozilla.org/1506672

#dmesg shoot out nothing unusual, but if someone would want to check it, here it is:
http://pastebin.com/9mHD36KX

hmm, maybe the next upgrade will correct this issue.
_________________
My art at www.danielchiriac.com

franzf · Advocate Joined: 29 Mar 2005 Posts: 4565

In your .xsession-errors is absolutely nothing about dolphin or thumbnail. Either the corresponding checkboxes in kdebugdialog are disabled, or you did not run dolphin while this .xsession-errors was written.
dmesg has nothing special, too (at least I could not find anything). The Samsung-HDD should be fast enough.
How many files are in the subdirectories?
I am currently copying some images (thousands

) to try to somehow reproduce this behaviour...

painteru · Tux's lil' helper Joined: 23 Aug 2007 Posts: 103

franzf · Advocate Joined: 29 Mar 2005 Posts: 4565

OK, 10 folders, each has >1800 images (jpegs, photos from my 5MP Digicam). Same for the folder containing those 10 folders. Copying with previews turned off.
When all was ready i pressed "show previews", and within 1.5 seconds, all folders had thumbs on them. The images got thumbnailed with a rate of ~20-30 thumbs/sec.
I am running an i7 2600K on an ASRock Z68 Board, WD Blue Caviar HDD on SATA3-Port. Quite High end ATM, but you Core2Duo should not make such an extremely bader job.
Somethings borked at your install :/

Did you try iotop, too? Because no CPU-usage does not neccessarily mean no I/O.

Do you have USE=thumbnail enabled for dolphin?

painteru · Tux's lil' helper Joined: 23 Aug 2007 Posts: 103

Well Franz, you're right! My PC is not an antiquity and I remember the days of KDE 3.5.10 when I had an AMD Duron @ 1.2 Ghz / 1Gb DDR 1 / HDD on ATA

and yet it used to work like a charm.
Now I run a 2.66Ghz Core2Duo e6750 / 4Gb DDR2 / SATA2 HDD