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From: Valentin Schneider <valentin.schneider@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>,
	linux-kernel@vger.kernel.org, mingo@redhat.com,
	peterz@infradead.org
Cc: pauld@redhat.com, srikar@linux.vnet.ibm.com,
	quentin.perret@arm.com, dietmar.eggemann@arm.com,
	Morten.Rasmussen@arm.com, hdanton@sina.com, parth@linux.ibm.com,
	riel@surriel.com
Subject: Re: [PATCH v4 00/10] sched/fair: rework the CFS load balance
Date: Fri, 3 Jan 2020 16:39:08 +0000	[thread overview]
Message-ID: <48636730-f8fb-6c65-fc30-068345923bc1@arm.com> (raw)
In-Reply-To: <e33e1896-01e1-665d-862a-e73384b0fbe6@arm.com>

On 25/11/2019 12:48, Valentin Schneider wrote:
> I've been busy trying to get some perf numbers on arm64 server~ish systems,
> I finally managed to get some specjbb numbers on TX2 (the 2 nodes, 224
> CPUs version which I suspect is the same as you used in the above). I only
> have a limited number of iterations (5, although each runs for about 2h)
> because I wanted to get some (usable) results by today, I'll spin some more
> during the week.
> 
> 
> This is based on the "critical-jOPs" metric which AFAIU higher is better:
> 
> Baseline, SMTOFF:
>   mean     12156.400000
>   std        660.640068
>   min      11016.000000
>   25%      12158.000000
>   50%      12464.000000
>   75%      12521.000000
>   max      12623.000000
> 
> Patches (+ find_idlest_group() fixup), SMTOFF:
>   mean     12487.250000
>   std        184.404221
>   min      12326.000000
>   25%      12349.250000
>   50%      12449.500000
>   75%      12587.500000
>   max      12724.000000	
> 
> 
> It looks slightly better overall (mean, stddev), but I'm annoyed by that
> low iteration count. I also had some issues with my SMTON run and I only
> got numbers for 2 iterations, so I'll respin that before complaining.
> 
> FWIW the branch I've been using is:
> 
>   http://www.linux-arm.org/git?p=linux-vs.git;a=shortlog;h=refs/heads/mainline/load-balance/vincent_rework/tip
> 

Forgot about that; I got some more results in the meantime, still specjbb
and still ThunderX2):

| kernel          | count |         mean |        std |     min |     50% |      75% |      99% |     max |
|-----------------+-------+--------------+------------+---------+---------+----------+----------+---------|
| -REWORK SMT-ON  |    15 | 19961.133333 | 613.406515 | 19058.0 | 20006.0 | 20427.50 | 20903.42 | 20924.0 |
| +REWORK SMT-ON  |    12 | 19265.666667 | 563.959917 | 18380.0 | 19133.5 | 19699.25 | 20024.90 | 20026.0 |
| -REWORK SMT-OFF |    25 | 12397.000000 | 425.763628 | 11016.0 | 12377.0 | 12623.00 | 13137.20 | 13154.0 |
| +REWORK SMT-OFF |    20 | 12436.700000 | 414.130554 | 11313.0 | 12505.0 | 12687.00 | 12981.44 | 12986.0 |

SMT-ON  delta: -3.48%
SMT-OFF delta: +0.32%


This is consistent with some earlier runs (where I had a few issues
getting enough iterations): SMT-OFF performs a tad better, and SMT-ON
performs slightly worse.

Looking at the 99th percentile, it seems we're a bit worse compared to
the previous best cases, but looking at the slightly reduced stddev it also
seems that we are somewhat more consistent.

      reply	other threads:[~2020-01-03 16:39 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-18 13:26 [PATCH v4 00/10] sched/fair: rework the CFS load balance Vincent Guittot
2019-10-18 13:26 ` [PATCH v4 01/11] sched/fair: clean up asym packing Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Clean " tip-bot2 for Vincent Guittot
2019-10-30 14:51   ` [PATCH v4 01/11] sched/fair: clean " Mel Gorman
2019-10-30 16:03     ` Vincent Guittot
2019-10-18 13:26 ` [PATCH v4 02/11] sched/fair: rename sum_nr_running to sum_h_nr_running Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Rename sg_lb_stats::sum_nr_running " tip-bot2 for Vincent Guittot
2019-10-30 14:53   ` [PATCH v4 02/11] sched/fair: rename sum_nr_running " Mel Gorman
2019-10-18 13:26 ` [PATCH v4 03/11] sched/fair: remove meaningless imbalance calculation Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Remove " tip-bot2 for Vincent Guittot
2019-10-18 13:26 ` [PATCH v4 04/11] sched/fair: rework load_balance Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Rework load_balance() tip-bot2 for Vincent Guittot
2019-10-30 15:45   ` [PATCH v4 04/11] sched/fair: rework load_balance Mel Gorman
2019-10-30 16:16     ` Valentin Schneider
2019-10-31  9:09     ` Vincent Guittot
2019-10-31 10:15       ` Mel Gorman
2019-10-31 11:13         ` Vincent Guittot
2019-10-31 11:40           ` Mel Gorman
2019-11-08 16:35             ` Vincent Guittot
2019-11-08 18:37               ` Mel Gorman
2019-11-12 10:58                 ` Vincent Guittot
2019-11-12 15:06                   ` Mel Gorman
2019-11-12 15:40                     ` Vincent Guittot
2019-11-12 17:45                       ` Mel Gorman
2019-11-18 13:50     ` Ingo Molnar
2019-11-18 13:57       ` Vincent Guittot
2019-11-18 14:51       ` Mel Gorman
2019-10-18 13:26 ` [PATCH v4 05/11] sched/fair: use rq->nr_running when balancing load Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Use " tip-bot2 for Vincent Guittot
2019-10-30 15:54   ` [PATCH v4 05/11] sched/fair: use " Mel Gorman
2019-10-18 13:26 ` [PATCH v4 06/11] sched/fair: use load instead of runnable load in load_balance Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Use load instead of runnable load in load_balance() tip-bot2 for Vincent Guittot
2019-10-30 15:58   ` [PATCH v4 06/11] sched/fair: use load instead of runnable load in load_balance Mel Gorman
2019-10-18 13:26 ` [PATCH v4 07/11] sched/fair: evenly spread tasks when not overloaded Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Spread out tasks evenly " tip-bot2 for Vincent Guittot
2019-10-30 16:03   ` [PATCH v4 07/11] sched/fair: evenly spread tasks " Mel Gorman
2019-10-18 13:26 ` [PATCH v4 08/11] sched/fair: use utilization to select misfit task Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Use " tip-bot2 for Vincent Guittot
2019-10-18 13:26 ` [PATCH v4 09/11] sched/fair: use load instead of runnable load in wakeup path Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Use " tip-bot2 for Vincent Guittot
2019-10-18 13:26 ` [PATCH v4 10/11] sched/fair: optimize find_idlest_group Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Optimize find_idlest_group() tip-bot2 for Vincent Guittot
2019-10-18 13:26 ` [PATCH v4 11/11] sched/fair: rework find_idlest_group Vincent Guittot
2019-10-21  9:12   ` [tip: sched/core] sched/fair: Rework find_idlest_group() tip-bot2 for Vincent Guittot
2019-10-22 16:46   ` [PATCH] sched/fair: fix rework of find_idlest_group() Vincent Guittot
2019-10-23  7:50     ` Chen, Rong A
2019-10-30 16:07     ` Mel Gorman
2019-11-18 17:42     ` [tip: sched/core] sched/fair: Fix " tip-bot2 for Vincent Guittot
2019-11-22 14:37     ` [PATCH] sched/fair: fix " Valentin Schneider
2019-11-25  9:16       ` Vincent Guittot
2019-11-25 11:03         ` Valentin Schneider
2019-11-20 11:58   ` [PATCH v4 11/11] sched/fair: rework find_idlest_group Qais Yousef
2019-11-20 13:21     ` Vincent Guittot
2019-11-20 16:53       ` Vincent Guittot
2019-11-20 17:34         ` Qais Yousef
2019-11-20 17:43           ` Vincent Guittot
2019-11-20 18:10             ` Qais Yousef
2019-11-20 18:20               ` Vincent Guittot
2019-11-20 18:27                 ` Qais Yousef
2019-11-20 19:28                   ` Vincent Guittot
2019-11-20 19:55                     ` Qais Yousef
2019-11-21 14:58                       ` Qais Yousef
2019-11-22 14:34   ` Valentin Schneider
2019-11-25  9:59     ` Vincent Guittot
2019-11-25 11:13       ` Valentin Schneider
2019-10-21  7:50 ` [PATCH v4 00/10] sched/fair: rework the CFS load balance Ingo Molnar
2019-10-21  8:44   ` Vincent Guittot
2019-10-21 12:56     ` Phil Auld
2019-10-24 12:38     ` Phil Auld
2019-10-24 13:46       ` Phil Auld
2019-10-24 14:59         ` Vincent Guittot
2019-10-25 13:33           ` Phil Auld
2019-10-28 13:03             ` Vincent Guittot
2019-10-30 14:39               ` Phil Auld
2019-10-30 16:24                 ` Dietmar Eggemann
2019-10-30 16:35                   ` Valentin Schneider
2019-10-30 17:19                     ` Phil Auld
2019-10-30 17:25                       ` Valentin Schneider
2019-10-30 17:29                         ` Phil Auld
2019-10-30 17:28                       ` Vincent Guittot
2019-10-30 17:44                         ` Phil Auld
2019-10-30 17:25                 ` Vincent Guittot
2019-10-31 13:57                   ` Phil Auld
2019-10-31 16:41                     ` Vincent Guittot
2019-10-30 16:24   ` Mel Gorman
2019-10-30 16:35     ` Vincent Guittot
2019-11-18 13:15     ` Ingo Molnar
2019-11-25 12:48 ` Valentin Schneider
2020-01-03 16:39   ` Valentin Schneider [this message]

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