linux-kernel - Re: [PATCH 2/2] mm, numa: Migrate pages to local nodes quicker early in the lifetime of a task

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Date:   Wed, 3 Oct 2018 14:21:55 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Jirka Hladky <jhladky@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH 2/2] mm, numa: Migrate pages to local nodes quicker early
 in the lifetime of a task

On Wed, Oct 03, 2018 at 06:37:41PM +0530, Srikar Dronamraju wrote:
> * Srikar Dronamraju <srikar@...ux.vnet.ibm.com> [2018-10-02 23:00:05]:
> 
> > I will try to get a DayTrader run in a day or two. There JVM and db threads
> > act on the same memory, I presume it might show some insights.
> 
> I ran 2 runs of daytrader 7 with and without patch on a 2 node power9
> PowerNv box.
> https://github.com/WASdev/sample.daytrader7
> In each run, has 8 JVMs.
> 
> Throughputs (Higher are better)
> Without patch 19216.8 18900.7 Average: 19058.75
> With patch    18644.5 18480.9 Average: 18562.70
> 
> Difference being -2.6% regression
> 

That's unfortunate.

How much does this workload normally vary between runs? If you monitor
migrations over time, is there an increase spike in migration early in
the lifetime of the workload?

-- 
Mel Gorman
SUSE Labs