linux-kernel - Re: [RFC PATCH 0/2] sched: simplify the select_task_rq

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Message-ID: <1358929257.5752.109.camel@marge.simpson.net>
Date:	Wed, 23 Jan 2013 09:20:57 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	peterz@...radead.org, mingo@...nel.org, a.p.zijlstra@...llo.nl
Subject: Re: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair()

On Wed, 2013-01-23 at 15:10 +0800, Michael Wang wrote: 
> On 01/23/2013 02:28 PM, Mike Galbraith wrote:

> > Abbreviated test run:
> > Tasks    jobs/min  jti  jobs/min/task      real       cpu
> >   640   158044.01   81       246.9438     24.54    577.66   Wed Jan 23 07:14:33 2013
> >  1280    50434.33   39        39.4018    153.80   5737.57   Wed Jan 23 07:17:07 2013
> >  2560    47214.07   34        18.4430    328.58  12715.56   Wed Jan 23 07:22:36 2013
> 
> So still not works... and not going to balance path while waking up will
> fix it, looks like that's the only choice if no error on balance path
> could be found...benchmark wins again, I'm feeling bad...
> 
> I will conclude the info we collected and make a v3 later.

FWIW, I hacked virgin to do full balance if an idle CPU was not found,
leaving the preference to wake cache affine intact though, turned on
WAKE_BALANCE in all domains, and it did not collapse.  In fact, the high
load end, where the idle search will frequently be a waste of cycles,
actually improved a bit.  Things that make ya go hmmm.

Tasks    jobs/min  jti  jobs/min/task      real       cpu
    1      436.60  100       436.5994     13.88      3.80   Wed Jan 23 08:49:21 2013
    1      437.23  100       437.2294     13.86      3.85   Wed Jan 23 08:49:45 2013
    1      440.41  100       440.4070     13.76      3.76   Wed Jan 23 08:50:08 2013
    5     2463.41   99       492.6829     12.30     10.90   Wed Jan 23 08:50:22 2013
    5     2427.88   99       485.5769     12.48     11.90   Wed Jan 23 08:50:37 2013
    5     2431.78   99       486.3563     12.46     11.74   Wed Jan 23 08:50:51 2013
   10     4867.47   99       486.7470     12.45     23.30   Wed Jan 23 08:51:05 2013
   10     4855.77   99       485.5769     12.48     23.35   Wed Jan 23 08:51:18 2013
   10     4891.04   99       489.1041     12.39     22.71   Wed Jan 23 08:51:31 2013
   20     9789.98   96       489.4992     12.38     36.18   Wed Jan 23 08:51:44 2013
   20     9774.19   97       488.7097     12.40     39.58   Wed Jan 23 08:51:56 2013
   20     9774.19   97       488.7097     12.40     37.99   Wed Jan 23 08:52:09 2013
   40    19086.61   98       477.1654     12.70     89.56   Wed Jan 23 08:52:22 2013
   40    19116.72   98       477.9180     12.68     92.69   Wed Jan 23 08:52:35 2013
   40    19056.60   98       476.4151     12.72     90.19   Wed Jan 23 08:52:48 2013
   80    37149.43   98       464.3678     13.05    114.19   Wed Jan 23 08:53:01 2013
   80    37436.29   98       467.9537     12.95    111.54   Wed Jan 23 08:53:14 2013
   80    37206.45   98       465.0806     13.03    111.49   Wed Jan 23 08:53:27 2013
  160    69605.17   97       435.0323     13.93    152.35   Wed Jan 23 08:53:41 2013
  160    69705.25   97       435.6578     13.91    152.05   Wed Jan 23 08:53:55 2013
  160    69356.22   97       433.4764     13.98    154.56   Wed Jan 23 08:54:09 2013
  320   112482.60   94       351.5081     17.24    285.52   Wed Jan 23 08:54:27 2013
  320   112222.22   94       350.6944     17.28    287.80   Wed Jan 23 08:54:44 2013
  320   109994.33   97       343.7323     17.63    302.40   Wed Jan 23 08:55:02 2013
  640   152273.26   94       237.9270     25.47    614.95   Wed Jan 23 08:55:27 2013
  640   153175.36   96       239.3365     25.32    608.48   Wed Jan 23 08:55:53 2013
  640   152994.08   95       239.0533     25.35    609.33   Wed Jan 23 08:56:18 2013
 1280   191101.26   95       149.2979     40.59   1218.71   Wed Jan 23 08:56:59 2013
 1280   191667.90   94       149.7405     40.47   1215.06   Wed Jan 23 08:57:40 2013
 1280   191289.77   94       149.4451     40.55   1217.35   Wed Jan 23 08:58:20 2013
 2560   221654.52   94        86.5838     69.99   2392.78   Wed Jan 23 08:59:31 2013
 2560   221117.45   91        86.3740     70.16   2399.01   Wed Jan 23 09:00:41 2013
 2560   220394.94   93        86.0918     70.39   2409.10   Wed Jan 23 09:01:52 2013


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