[petsc-users] Error with KSPSetUp and MatNest

[Klaij, Christiaan]

Just like Manuel Colera Rico, I would like to begin with existing
(sub)matrices and put them directly into a matnest.

You seem to have understood that problem from the archive 2.5
years ago... If my memory is correct, it was an attempt to
create a mat and switch between -mat_type nest and aij on the
command line.


Chris

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________________________________
From: Matthew Knepley <knepley at gmail.com>
Sent: Thursday, April 11, 2019 2:16 PM
To: Klaij, Christiaan
Cc: petsc-users at mcs.anl.gov
Subject: Re: [petsc-users] Error with KSPSetUp and MatNest

On Thu, Apr 11, 2019 at 7:51 AM Klaij, Christiaan via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Matt,

As a happy MATNEST user, I got a bit worried when you wrote "we
should remove MatCreateNest() completely".

This would not remove any of the Nest functionality, just the direct interface to it, which is the problem.

This happened last
time I tried to use AIJ instead:

https://lists.mcs.anl.gov/mailman/htdig/petsc-users/2016-August/029973.html

Has this problem been fixed in the meantime?

This looks like a problem with the Nest implementation, not AIJ? Maybe I am misunderstanding it.

   Thanks,

     Matt

Chris

> I think we should remove MatCreateNest() completely. We should have 1
> mechanism for getting submatrices for creation, not 2, so we retain
> MatCreateLocalRef(). Then if -mat_type nest was specified, it gives you
> back an actually submatrix, otherwise it gives a view. This would do
> everything that we currently do without this horrible MatNest interface
> bubbling to the top.
>
>    Matt
>


dr. ir. Christiaan Klaij  | Senior Researcher | Research & Development
MARIN | T +31 317 49 33 44 | mailto:C.Klaij at marin.nl<mailto:C.Klaij at marin.nl> | http://www.marin.nl

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