[Digikam-users] Digikam slow

[Gilles Caulier]

2007/12/8, Andreas Weigl <Andreas.Weigl at silicoids-world.de>:
>
> Hi
>
> Am Saturday 08 December 2007 schrieb Dotan Cohen:
> > > If find prints some files then new files have been written or changed.
> If
> > > their are no new files than the caching in general works.
> > > I did this on my system. No new files here.
> >
> > No new files.
>
> This means the caching basically works. Good.
>
> > I ran Recreate Thumbnails, then touch testfile, then browse a few
> > directories. Sure enough, there are some new files in ~/.thumbnails.
> > So I've either hit a limit or there is a caching problem. How can I
> > test that?
>
> I think this can only be answered by the developers because I do not know
> the
> caching algorithm.
>
> Does anybody know a description of the algorithm besides the source code?


This is the code of thumbs cache implementation:

http://websvn.kde.org/branches/extragear/kde3/graphics/digikam/digikam/pixmapmanager.h?revision=670778&view=markup
http://websvn.kde.org/branches/extragear/kde3/graphics/digikam/digikam/pixmapmanager.cpp?revision=670778&view=markup

PixmapManager class use internally QCache from Qt to store thumb in memory.
All is explained in Qt API doc

http://doc.trolltech.com/3.3/qcache.html

Note than QCache instance is used with this constructor :

QCache<QPixmap>(101, 211);

Gilles Caulier

> An instant. However, in ~/.thumbnails/large it took 3.5 seconds, and
> > in ~/.thumbnails/normal another 3.5 seconds.
>
> So you do not have a problem with reading the directory contents. I didn't
> thought you have but it is always good to check.
>
> > > You can not clean the .thumbnails directory (you cache would be gone).
> > > But I saw that "all files" are in one directory. A structure like
> squid
> > > or postfix is usally much more performant.
> >
> > Is that something that I can arrange, or would it be an internal digikam
> > issue?
>
> This is digikam internal.
>
> If I have some time I will have a look on the source code. But my C
> programming skills are very poor.
>
>
> Andreas
> --
> My Public GPG Key:
> http://www.silicoids-world.de/gpg.asc
>
> Too much is just enough.
>                 -- Mark Twain, on whiskey
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