Hi Pierre,
ok, that's a nice trick!
Thanks for this great hint! :)
Eric
On 2021-12-14 3:58 p.m., Pierre Jolivet wrote:
Hello Eric,
Why do you want to use a MATIS?
This solution that Barry suggested to me some time ago is perfectly
functioning:
https://lists.mcs.anl.gov/pipermail/petsc-dev/2020-January/025491.html
<https://lists.mcs.anl.gov/pipermail/petsc-dev/2020-January/025491.html>
That’s what I do for optimized (restricted) additive Schwarz.
You can see also how to use this “trick” from Barry here:
https://gitlab.com/petsc/petsc/-/commit/ba409789b0c94205af794ad85bdac232504f2b3f#2c7d367ac831f3b0c5fb767c0eb16c1ea7ae7fe0_821_821
<https://gitlab.com/petsc/petsc/-/commit/ba409789b0c94205af794ad85bdac232504f2b3f#2c7d367ac831f3b0c5fb767c0eb16c1ea7ae7fe0_821_821> (it’s
in a WIP branch, and for the fine-level PCASM smoother used in
PCHPDDM, but at least it’s actual code, in case you do not follow what
Barry and I are saying in the old thread).
Thanks,
Pierre
On 14 Dec 2021, at 9:37 PM, Eric Chamberland
<[email protected]
<mailto:[email protected]>> wrote:
Hi,
We want to use an Additive Schwarz preconditioner (like PCASM)
combined with overlapping meshes *and* specific boundary conditions
to local (MATIS) matrices.
At first sight, MATIS is only supported for BDDC and FETI-DP and is
not working with PCASM.
Do we have to write a new PC from scratch to combine the use of mesh
overlap, MATIS and customized local matrices?
...or is there any working example we should look at to start from? :)
Thanks a lot!
Eric
--
Eric Chamberland, ing., M. Ing
Professionnel de recherche
GIREF/Université Laval
(418) 656-2131 poste 41 22 42
--
Eric Chamberland, ing., M. Ing
Professionnel de recherche
GIREF/Université Laval
(418) 656-2131 poste 41 22 42
