Re: [gentoo-amd64] PORTAGE_NICENESS

[Mark Knecht]

On 6/14/07, Hemmann, Volker Armin <volker.armin.hemmann@××××××××××××.de> wrote:
> 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.

Thanks Volker.

so do I actually use "+19"?

PORTAGE_NICENESS="+19"

or

PORTAGE_NICENESS=19

Thanks,
Mark
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