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Old 03-08-2010, 08:13 PM
Valerio Passini
 
Default Desktop search: should background processes be (io)niced?

Alle luned́ 08 marzo 2010, Michael Schuerig ha scritto:
> I'm trying to take advantage of the newly usable desktop search
> feature and have selected several GBs of documents for indexing. The
> drawback is that the various processes associated with this task --
> nepomukservices, virtuoso-t -- chew heavily on the CPU and slurp
> away I/O bandwidth.
>
> I noticed one nepomukservices process that is running at nice level
> 19, all other related processes apparently have nice level 0. I
> don't know if there is any ionice-ing done at all. Shouldn't all
> these processes be running in such a way as to yield CPU and I/O
> bandwidth to other processes?
>
> The only possible reason against this might be issues with priority
> inversion, where a higher priority (UI) app is waiting for a lower
> priority server process to reply, while at the same time precluding
> the lower priority process from getting any work done. However, I
> have no idea whether this case can occur at all.
>
> Michael

I was as willing as you to try it, but there is problem with strigi
starting indexing the same stuff over and over again. See bug:
https://bugs.kde.org/show_bug.cgi?id=226895
In theory the desktop search engine should eat much CPU only once, at
the beginning, when the index must be built from zero. When this process
is completed, only newer files need to be indexed and the CPU usage is
comparably lower. If you don't meet that bug, you probably should be
happy with nepomuk.

Vale


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