[kde-linux] Renicing KDE service daemons

[Kevin Krammer]

On Thursday 12 February 2009, David Baron wrote:
> On Thursday 12 February 2009 09:38:32 kde-linux-request at kde.org wrote:
> >>  At least for a long-enough period maybe for syncronization, these
> >> thingies
> >>
> > > are taking several percent each of CPU time. I believe that many posted
> > > compaints about overall slowness of reponse in kde4.2 are due to this!
> >
> > My guess is that these reports are rather about slow visualizations.
> > The only complain about processes so far seem to be Nepomuk when its
> > Strigi indexer is doing its initial work.
> > Most of the time this seems to be related to the Redland backend being
> > used instead of the much faster Sesame2.
>
> I am not running strigi. Recollinex (niced) is running but I do not believe
> nepomuk connects to this (I would like it to). I do not know whether strigi
> or recoll is better but google took too much of a hit and was flakey.

I am not sure if Nepomuk currently can use other indexers or if this is 
planned. Since indexing is basically a way to recover metadata from files, it 
could also work the other way around, i.e. the indexer feeding its findings 
into the metadata/ontology store.

> Redland? This stuff uses RDF? If so, I put in redland in order to compile
> some audio plugins. How do I replace with sesame2 and is this a drop-in
> compatable replacement, that is, also suitable for the audio applications?

Yes, Nepomuk relation triples are stored as RDF AFAIK. It uses an access 
abstraction library called Soprano (IIRC) and there are currently two 
backends for that: Redland (slow but, C/C++) and Sesame2 (fast, but Java, so 
often not packages by distributors as the default)

Cheers,
Kevin
-- 
Kevin Krammer, KDE developer, xdg-utils developer
KDE user support, developer mentoring
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