Messages in this thread | | | Date | Tue, 31 May 2022 15:09:24 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH v2 0/4] Mitigate inconsistent NUMA imbalance behaviour |
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On Tue, May 31, 2022 at 12:26:51PM +0200, Vincent Guittot wrote: > > # cd work/log > > # ../../compare-kernels.sh > > > > nas-mpich-mg NAS Time > > test > > mgD-many > > Min mg.D 95.80 ( 0.00%) > > Amean mg.D 110.77 ( 0.00%) > > Stddev mg.D 21.55 ( 0.00%) > > CoeffVar mg.D 19.46 ( 0.00%) > > Max mg.D 155.35 ( 0.00%) > > BAmean-50 mg.D 96.05 ( 0.00%) > > BAmean-95 mg.D 107.83 ( 0.00%) > > BAmean-99 mg.D 109.23 ( 0.00%) > > > > Note the min of 95.80 seconds, max of 155.35 and high stddev indicating > > the results are not stable. > > > > The generated config is for openSUSE so it may not work for you. After > > installing the mpich package, you'll need to adjust these lines > > > > export NAS_MPICH_PATH=/usr/$MMTESTS_LIBDIR/mpi/gcc/$NAS_MPICH_VERSION/bin > > export NAS_MPICH_LIBPATH=/usr/$MMTESTS_LIBDIR/mpi/gcc/$NAS_MPICH_VERSION/$MMTESTS_LIBDIR > > > > NAS_MPICH_PATH and NAS_MPICH_LIBPATH need to point to the bin and lib > > path for the mpich package your distribution ships. > > I have been able to run your tests on my setup: aarch64 2 nodes * 28 > cores * 4 threads. But I can't reproduce the problem, results stay > stable before and after reverting c6f886546cb8. >
It's unfortunate but not surprising that it's not perfectly reproducible given that I expect this to be a race of some description and not all machines will observe the problem.
Thanks for trying.
-- Mel Gorman SUSE Labs
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