linux-kernel - Re: EEVDF and NUMA balancing

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Date:   Mon, 9 Oct 2023 12:29:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: EEVDF and NUMA balancing

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@...-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@...-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# cat /proc/sys/kernel/numa_balancing
1
root@...-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# ./ua.C.x | grep "Time in seconds"
 Time in seconds =                    26.69
root@...-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# ./ua.C.x | grep "Time in seconds"
 Time in seconds =                    26.31
root@...-ex:/usr/local/src/nas-parallel-benchmarks/NPB3.4-OMP/bin# ./ua.C.x | grep "Time in seconds"
 Time in seconds =                    25.43


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 :-)