[petsc-users] Hypre AMS usage

[Karthikeyan Chockalingam - STFC UKRI]

Hi Matt,

You mentioned it doesn’t hurt to set the smoothing flags

https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L965__;Iw!!G_uCfscf7eWS!ab7xBNMnurfBQihWzSOZdJKuuhPObxZolYSuACYpW4-NN7L84moQXv7vO962vvaVT3soXUhcCaNH6_B2mLY_MzICr-c63C4mpYGo$ <https://urldefense.us/v3/__https:/github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L965__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9XJ0EWuqr2PidZJdPqbnFzCshQFo-mclGSvGBOPuGSTkjPvMKnIfJzWos7QShcSitpwyrhL55yOMB-v$>
Do you know where I can look for the equivalent PETSc commands? Thank you.

Kind regards,
Karthik.

From: Matthew Knepley <knepley at gmail.com>
Date: Friday, 6 September 2024 at 17:57
To: Chockalingam, Karthikeyan (STFC,DL,HC) <karthikeyan.chockalingam at stfc.ac.uk>
Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] Hypre AMS usage
On Fri, Sep 6, 2024 at 11:37 AM Karthikeyan Chockalingam - STFC UKRI via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Hello,

I am trying to use the Hypre AMS preconditioner for the first time.

I am following the example problem from Hypre
https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L954__;Iw!!G_uCfscf7eWS!ab7xBNMnurfBQihWzSOZdJKuuhPObxZolYSuACYpW4-NN7L84moQXv7vO962vvaVT3soXUhcCaNH6_B2mLY_MzICr-c63EQeUx5h$ <https://urldefense.us/v3/__https:/github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L954__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9XJ0EWuqr2PidZJdPqbnFzCshQFo-mclGSvGBOPuGSTkjPvMKnIfJzWos7QShcSitpwyrhL5ySgA0XM$>

I have so far successfully set the discrete gradient operator and vertex co-ordinates,

// Set discrete gradient
  petscErr = PCHYPRESetDiscreteGradient(pc, par_G);

  // Set vertex coordinates
  petscErr = PCHYPRESetEdgeConstantVectors(pc, par_xvec, par_yvec, par_zvec);

Do I need to set the following smoothing options?
https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L965__;Iw!!G_uCfscf7eWS!ab7xBNMnurfBQihWzSOZdJKuuhPObxZolYSuACYpW4-NN7L84moQXv7vO962vvaVT3soXUhcCaNH6_B2mLY_MzICr-c63C4mpYGo$ <https://urldefense.us/v3/__https:/github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L965__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9XJ0EWuqr2PidZJdPqbnFzCshQFo-mclGSvGBOPuGSTkjPvMKnIfJzWos7QShcSitpwyrhL55yOMB-v$>

It cannot hurt. I would set them to begin with.

Also, do I need to convert from MATMPIAIJ to CSR?
https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L984__;Iw!!G_uCfscf7eWS!ab7xBNMnurfBQihWzSOZdJKuuhPObxZolYSuACYpW4-NN7L84moQXv7vO962vvaVT3soXUhcCaNH6_B2mLY_MzICr-c63J_yBxgt$ <https://urldefense.us/v3/__https:/github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L984__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9XJ0EWuqr2PidZJdPqbnFzCshQFo-mclGSvGBOPuGSTkjPvMKnIfJzWos7QShcSitpwyrhL53Trv1si$>

No.

What are the other PETSc calls to invoke AMS? Is there an example problem I can look at?

I do not know. I don't think we have an example.

  Thanks,

    Matt

Thank you.

Karthik.

--
Karthik Chockalingam, Ph.D.
Senior Research Software Engineer
High Performance Systems Engineering Group
Hartree Centre | Science and Technology Facilities Council
karthikeyan.chockalingam at stfc.ac.uk<mailto:karthikeyan.chockalingam at stfc.ac.uk>

 [signature_3970890138]



--
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

https://urldefense.us/v3/__https://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!ab7xBNMnurfBQihWzSOZdJKuuhPObxZolYSuACYpW4-NN7L84moQXv7vO962vvaVT3soXUhcCaNH6_B2mLY_MzICr-c63F-LoyUA$ <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!ab7xBNMnurfBQihWzSOZdJKuuhPObxZolYSuACYpW4-NN7L84moQXv7vO962vvaVT3soXUhcCaNH6_B2mLY_MzICr-c63NJaW4eQ$ >
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20240909/fc99b706/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 18270 bytes
Desc: image001.png
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20240909/fc99b706/attachment-0001.png>