Re: Sched_autogroup and niced processes

[Carl-Johan Kjellander]

On Fri, May 13, 2011 at 11:07 AM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> On Fri, 2011-05-13 at 11:05 +0200, Ingo Molnar wrote:
>> Could we somehow automate this:
>>
>> Â > echo 19 > /proc/'pid of seti@home'/autogroup

Tried this.
echo 19 >/proc/23760/autogroup
echo 1 > /proc/sys/kernel/sched_autogroup_enabled

time make -j12 #seti@home, autogroup, group reniced.
real	3m9.274s
user	11m3.020s
sys	1m45.550s

So 50% increase in compilation time.

Will these autogroups remember the 19, the boinc manager starts 8
processes and it will spawn more as time goes by and it finishes
tasks.

>> and split off nice 19 tasks into separate groups and lower the group's
>> priority?
>
> Well I guess you can stack on all kinds of heuristics, do we want to?
> I'd argue for not, keep is simple.
>

I'd again argue, I use nice 19 for stuff that I want to run on the
spare cycles, I don't want them stealing time from my important work
or surfing or movie viewing.

/cjk
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