On Sun, Jun 18, 2023 at 2:49 PM Duan Junming wrote:
> *From:* knep...@gmail.com
> *Sent:* Sunday, June 18, 2023 20:35
> *To:* Duan Junming
> *Cc:* petsc-users@mcs.anl.gov
> *Subject:* Re: [petsc-users] Advice on small block matrix vector
> multiplication
>
>
> On Sun, Jun 18, 2023 at 2:13 PM
From: knep...@gmail.com
Sent: Sunday, June 18, 2023 20:35
To: Duan Junming
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Advice on small block matrix vector multiplication
On Sun, Jun 18, 2023 at 2:13 PM Duan Junming via petsc-users
mailto:petsc-users@mcs.anl.gov>> wrote:
Dear all,
I
On Sun, Jun 18, 2023 at 2:21 PM YuSh Lo wrote:
> Hi Matthew,
>
> Yes, I have called DMPlexDistribute().
>
> so what I do is:
>
> CALL DMSetUseNatural(serialDM, PETSC_TRUE, errorCode)
> CALL DMPlexDistribute(serialDM, 0, migrationSF, distributedDM, errorCode)
> CALL
On Sun, Jun 18, 2023 at 2:13 PM Duan Junming via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> Dear all,
>
> I am using DMPlex to manage the unknowns, two fields, one for pressure,
> and one for velocities with two/three components, defined in each cell.
> They're represented by polynomials,
Hi Matthew,
Yes, I have called DMPlexDistribute().
so what I do is:
CALL DMSetUseNatural(serialDM, PETSC_TRUE, errorCode)
CALL DMPlexDistribute(serialDM, 0, migrationSF, distributedDM, errorCode)
CALL DMPlexGetGlobalToNaturalSF(serialDM, naturalSF, errorCode)
CALL PetscSFView(naturalSF,
Dear all,
I am using DMPlex to manage the unknowns, two fields, one for pressure, and one
for velocities with two/three components, defined in each cell. They're
represented by polynomials, with N (10~50) dofs for each component.
I have an operator which can be written in a matrix form (N-by-N,
I am concerned this is not good advice being provided.
Let's back up and look more closely at your use case.
* What is the ratio of new nonzero locations added compared to the initial
number of nonzeros for your code, for each of your iterations?
* Is it possible for many iterations,
On Sun, Jun 18, 2023 at 2:12 AM YuSh Lo wrote:
> I am getting a null PetscSF after calling DMPlexGetGlobalToNatural
>
Did you call DMDIstribute()? This is where the map is created because until
then, the map is identity.
Thanks,
Matt
> YuSh Lo 於 2023年6月18日 週日 上午12:18寫道：
>
>> Hi
I am getting a null PetscSF after calling DMPlexGetGlobalToNatural
YuSh Lo 於 2023年6月18日 週日 上午12:18寫道：
> Hi Matthew,
>
> After setting DMSetUseNatural to true and calling DMPlexGetGlobalToNatural,
> I call PestcSFView right away, it gives segmentation fault.
> I have also tried DMGetNaturalSF,
