Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.36 as permitted sender) client-ip=23.128.96.36;
Date:   Mon, 9 Oct 2023 16:07:32 +0200 (CEST)
From:   Julia Lawall <julia.lawall@inria.fr>
To:     Peter Zijlstra <peterz@infradead.org>
cc:     Ingo Molnar <mingo@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Mel Gorman <mgorman@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: EEVDF and NUMA balancing
In-Reply-To: <20231009102949.GC14330@noisy.programming.kicks-ass.net>
Message-ID: <e4a382dd-b6e5-5f47-45b-17c59b2cc48f@inria.fr>
References: <alpine.DEB.2.22.394.2310032059060.3220@hadrien> <20231003215159.GJ1539@noisy.programming.kicks-ass.net> <alpine.DEB.2.22.394.2310041358420.3108@hadrien> <20231004120544.GA6307@noisy.programming.kicks-ass.net> <alpine.DEB.2.22.394.2310041822170.3108@hadrien>
 <20231004174801.GE19999@noisy.programming.kicks-ass.net> <alpine.DEB.2.22.394.2310041958380.3108@hadrien> <20231009102949.GC14330@noisy.programming.kicks-ass.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Precedence: bulk


On Mon, 9 Oct 2023, Peter Zijlstra wrote:

> On Wed, Oct 04, 2023 at 08:04:34PM +0200, Julia Lawall wrote:
> > > I'll go build the benchmark thing tomorrow, if I can figure out how that
> > > works, this NAS stuff looked 'special'. Nothing simple like ./configure;
> > > make -j$lots :/
> >
> > Starting from git clone, I had to do:
> >
> > cd NPB3.4-OMP
> > mkdir bin
> > cd config
> > cp make.def.template make.def
> > cd ..
> > make ua CLASS=C
> >
> > You also need gfortran to be installed.
>
> W00t, that worked like a charm.
>
> The sad new is that I can't seem to reproduce the issue:
>
> So my (freshly re-installed with debian testing) 4 socket Intel(R)
> Xeon(R) CPU E7-8890 v3 machine gives me:
>
> root@hsw-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# uname -a
> Linux hsw-ex 6.6.0-rc4+ #2 SMP PREEMPT_DYNAMIC Mon Oct  9 11:14:21 CEST 2023 x86_64 GNU/Linux
> root@hsw-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# cat /proc/sys/kernel/numa_balancing
> 1
> root@hsw-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# ./ua.C.x | grep "Time in seconds"
>  Time in seconds =                    26.69
> root@hsw-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# ./ua.C.x | grep "Time in seconds"
>  Time in seconds =                    26.31
> root@hsw-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# ./ua.C.x | grep "Time in seconds"
>  Time in seconds =                    25.43

How many runs did you try?  I would suggest 50.

25-26 looks like what I get when things go well.

julia

>
>
> And this is using a .config very near what Debian ships for 6.5 (make
> olddefconfig -CONFIG_DEBUG_INFO_BTF)
>
> I'll try again in a little bit, perhaps I'm suffering PEBKAC :-)
>
>
>