[petsc-dev] Parmetis bug

[Fande Kong]

Hi Mark,

Thanks for reporting this bug. I was surprised because we have sufficient
heavy tests in moose using partition weights and do not have any issue so
far.

I will take a shot on this.

Fande,

On Sat, Nov 9, 2019 at 3:08 PM Mark Adams <mfadams at lbl.gov> wrote:

> snes/ex13 is getting a ParMetis segv with GAMG and coarse grid
> repartitioning. Below shows the branch and how to run it.
>
> I've tried valgrind on Cori but it gives a lot of false positives. I've
> seen this error in DDT but I have not had a chance to dig and try to fix
> it. At least I know it has something to do with weights.
>
> If anyone wants to take a shot at it feel free. This bug rarely happens.
>
> The changes use weights and are just a few lines of code (from 1.5 years
> ago):
>
> 12:08 (0455fb9fec...)|BISECTING ~/Codes/petsc$ git bisect bad
> 0455fb9fecf69cf5cf35948c84d3837e5a427e2e is the first bad commit
> commit 0455fb9fecf69cf5cf35948c84d3837e5a427e2e
> Author: Fande Kong <fdkong.jd at gmail.com>
> Date:   Thu Jun 21 18:21:19 2018 -0600
>
>     Let parmetis and ptsotch take edge weights and vertex weights
>
>  src/mat/partition/impls/pmetis/pmetis.c | 7 +++++++
>  src/mat/partition/impls/scotch/scotch.c | 6 +++---
>  2 files changed, 10 insertions(+), 3 deletions(-)
>
> > mpiexec -n 32 ./ex13 -cells 2,4,4, -dm_refine 5 -simplex 0 -dim 3
> -potential_petscspace_degree 1 -potential_petscspace_order 1 -pc_type gamg
> -petscpartitioner_type simple -pc_gamg_repartition
> true -check_pointer_intensity 0
>
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