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SubjectRe: Nice 19 process still gets some CPU
Date
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Quoting Chris Friesen <cfriesen@nortelnetworks.com>:
> Timothy Miller wrote:
> >
> >
> > Con Kolivas wrote:
> >
> > >
> > > It definitely should _not_ starve. That is the unixy way of doing
> > > things. Everything must go forward. Around 5% cpu for nice 19 sounds
> > > just right. If you want scheduling only when there's spare cpu cycles
> > > you need a sched batch(idle) implementation.
> > >
> > >
> >
> > Well, since I can't rewrite the app, I can't make it sched batch. Nice
> > values are an easy thing to get at for anything that's running.
>
> Sure you can. You can set the scheduler policy on any process in the system,
> while its running.
>
> int sched_setscheduler(pid_t pid, int policy, const struct sched_param *p);
>
> Takes about two minutes to write an equivalent to "nice" to set scheduler
> policies and priorities.

Sounds cool. I was searching this syscall for a long time, now. :)
But batch scheduling is available in -ck only, so this works only
with -ck kernels. Correct?

> Chris

- --
Regards Michael Buesch [ http://www.tuxsoft.de.vu ]


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