[petsc-users] Hypre AMS usage

[Matthew Knepley]

On Mon, Sep 9, 2024 at 10:17 AM Karthikeyan Chockalingam - STFC UKRI <
karthikeyan.chockalingam at stfc.ac.uk> wrote:

> 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!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9UgAwQR8$ 
> <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.
>

Yes, this is described here: https://urldefense.us/v3/__https://petsc.org/main/manualpages/PC/PCHYPRE/__;!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9e0RfePC$ 
The best way is to run with -help or look at the source.

  Thanks,

     Matt


>
>
> 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> 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!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9ceRKXFn$ 
> <https://urldefense.us/v3/__https:/github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L954__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9XJ0EWuqr2PidZJdPqbnFzCshQFo-mclGSvGBOPuGSTkjPvMKnIfJzWos7QShcSitpwyrhL5ySgA0XM$>
>
>
>
> I have so far successfully set the discrete gradient operator and vertex
> co-ordinates,
>
>
>
> // Set discrete gradient
>
>   petscErr = PCHYPRESetDiscreteGradient(pc, par_G);
>
>
>
>   // Set vertex coordinates
>
>   petscErr = PCHYPRESetEdgeConstantVectors(pc, par_xvec, par_yvec,
> par_zvec);
>
>
>
> Do I need to set the following smoothing options?
>
>
> https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L965__;Iw!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9UgAwQR8$ 
> <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$>
>
>
>
> It cannot hurt. I would set them to begin with.
>
>
>
> Also, do I need to convert from MATMPIAIJ to CSR?
>
>
> https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L984__;Iw!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9culzuUp$ 
> <https://urldefense.us/v3/__https:/github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L984__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9XJ0EWuqr2PidZJdPqbnFzCshQFo-mclGSvGBOPuGSTkjPvMKnIfJzWos7QShcSitpwyrhL53Trv1si$>
>
>
>
> No.
>
>
>
> What are the other PETSc calls to invoke AMS? Is there an example problem
> I can look at?
>
>
>
> I do not know. I don't think we have an example.
>
>
>
>   Thanks,
>
>
>
>     Matt
>
>
>
> Thank you.
>
>
>
> Karthik.
>
>
>
> --
>
> *Karthik Chockalingam, Ph.D.*
>
> Senior Research Software Engineer
>
> High Performance Systems Engineering Group
>
> Hartree Centre | Science and Technology Facilities Council
>
> karthikeyan.chockalingam at stfc.ac.uk
>
>
>
>  [image: signature_3970890138]
>
>
>
>
>
>
> --
>
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
>
>
> https://urldefense.us/v3/__https://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9RAVjWAj$ 
> <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9ZyhqOzc$ >
>


-- 
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!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9RAVjWAj$  <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9ZyhqOzc$ >
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