> Marcos
> --
> *From:* Matthew Knepley
> *Sent:* Tuesday, June 27, 2023 2:08 PM
> *To:* Vanella, Marcos (Fed)
> *Cc:* Mark Adams ; petsc-users@mcs.anl.gov <
> petsc-users@mcs.anl.gov>
> *Subject:* Re: [petsc-users] SOLVE + PC combin
To: Matthew Knepley
Cc: Mark Adams ; petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] SOLVE + PC combination for 7 point stencil
(unstructured) poisson solution
Thank you Matt. I'll try the flags you recommend for monitoring. Correct, I'm
trying to see if GPU would provide an advantage
Marcos (Fed)
mailto:marcos.vane...@nist.gov>>
Cc: Mark Adams mailto:mfad...@lbl.gov>>;
petsc-users@mcs.anl.gov<mailto:petsc-users@mcs.anl.gov>
mailto:petsc-users@mcs.anl.gov>>
Subject: Re: [petsc-users] SOLVE + PC combination for 7 point stencil
(unstructured) poisson solution
On M
Cc:* Mark Adams ; petsc-users@mcs.anl.gov <
> petsc-users@mcs.anl.gov>
> *Subject:* Re: [petsc-users] SOLVE + PC combination for 7 point stencil
> (unstructured) poisson solution
>
> On Mon, Jun 26, 2023 at 12:08 PM Vanella, Marcos (Fed) via petsc-users <
> petsc-users@mcs
help!
Marcos
From: Matthew Knepley
Sent: Monday, June 26, 2023 12:11 PM
To: Vanella, Marcos (Fed)
Cc: Mark Adams ; petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] SOLVE + PC combination for 7 point stencil
(unstructured) poisson solution
On Mon, Jun 26, 2023
That is what I did with suitesparse, very nice.
> --
> *From:* Mark Adams
> *Sent:* Monday, June 26, 2023 12:05 PM
> *To:* Vanella, Marcos (Fed)
> *Cc:* petsc-users@mcs.anl.gov
> *Subject:* Re: [petsc-users] SOLVE + PC combination for 7 point stencil
>
: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] SOLVE + PC combination for 7 point stencil
(unstructured) poisson solution
I'm not sure what MG is doing with an "unstructured" problem. I assume you are
not using DMDA.
-pc_type gamg should work
I would configure with hypre and try
I'm not sure what MG is doing with an "unstructured" problem. I assume you
are not using DMDA.
-pc_type gamg should work
I would configure with hypre and try that also: -pc_type hypre
As Matt said MG should be faster. How many iterations was it taking?
Try a 100^3 and check that the iteration
On Mon, Jun 26, 2023 at 11:34 AM Vanella, Marcos (Fed) via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> Hi, I was wondering if anyone has experience on what combinations are more
> efficient to solve a Poisson problem derived from a 7 point stencil on a
> single mesh (serial).
> I've been
Hi, I was wondering if anyone has experience on what combinations are more
efficient to solve a Poisson problem derived from a 7 point stencil on a single
mesh (serial).
I've been doing some tests of multigrid and cholesky on a 50^3 mesh. -pc_type
mg takes about 75% more time than -pc_type
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