Re: [gentoo-amd64] PORTAGE_NICENESS

["Hemmann, Volker Armin" <volker.armin.hemmann@tu-clausthal.de>]

On Donnerstag, 14. Juni 2007, Mark Knecht wrote:
> I'm wondering if anyone can recommend a good setting for
> PORTAGE_NICENESS that would allow some compiles in the background
> without drastically effecting MythTV? Or is there some better way to
> do this with other software?
>
> I've fiddled around with renicing mythfrontend but even going to -15
> didn't seem to help that much. Seems better to just make the compiles
> slower and more friendly.
>
> Note that this seems somewhat worse under the newest -rt kernel -
> 2.6.21.4-rt12-cfs-v17. I may need to back up and see if the previous
> one I was running was any better.
>
> Thanks in advance,
> Mark


set it to +19

not only does it free lots of CPU cycles for everybody else, they are 
also 'batch scheduled' which should be good for compiling.

read /usr/src/linux/Documentation/sched-desing.txt

quote:
- batch scheduling. A significant proportion of computing-intensive tasks
   benefit from batch-scheduling, where timeslices are long and processes
   are roundrobin scheduled. The new scheduler does such batch-scheduling
   of the lowest priority tasks - so nice +19 jobs will get
   'batch-scheduled' automatically. With this scheduler, nice +19 jobs are
   in essence SCHED_IDLE, from an interactiveness point of view.
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