linux-kernel - Re: Sched_autogroup and niced processes

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Message-ID: <BANLkTikxS9350zKqLEHXqeXCLXpQK=Cd9A@mail.gmail.com>
Date:	Fri, 13 May 2011 11:14:47 +0200
From:	Carl-Johan Kjellander <carl-johan@...rna.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Sched_autogroup and niced processes

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

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

time make -j12 #seti@...e, 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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