I would say the best way is to look at the source code https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/pc/impls/hypre/hypre.c?ref_type=heads*L2061__;Iw!!G_uCfscf7eWS!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf7BSgg7vg$ https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/pc/impls/hypre/hypre.c?ref_type=heads*L1239__;Iw!!G_uCfscf7eWS!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf7I5s85AM$
Il giorno lun 9 set 2024 alle ore 18:50 Matthew Knepley <knep...@gmail.com> ha scritto: > On Mon, Sep 9, 2024 at 10:17 AM Karthikeyan Chockalingam - STFC UKRI < > karthikeyan.chockalin...@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!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf7ymdPBOQ$ >> >> <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$> >> >> Do you know where I can look for the equivalent PETSc commands? Thank you. >> > > Yes, this is described here: > https://urldefense.us/v3/__https://petsc.org/main/manualpages/PC/PCHYPRE/__;!!G_uCfscf7eWS!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf7oW09bmM$ > > <https://urldefense.us/v3/__https://petsc.org/main/manualpages/PC/PCHYPRE/__;!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9e0RfePC$> > The best way is to run with -help or look at the source. > > Thanks, > > Matt > > >> >> >> Kind regards, >> >> Karthik. >> >> >> >> *From: *Matthew Knepley <knep...@gmail.com> >> *Date: *Friday, 6 September 2024 at 17:57 >> *To: *Chockalingam, Karthikeyan (STFC,DL,HC) < >> karthikeyan.chockalin...@stfc.ac.uk> >> *Cc: *petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov> >> *Subject: *Re: [petsc-users] Hypre AMS usage >> >> On Fri, Sep 6, 2024 at 11:37 AM Karthikeyan Chockalingam - STFC UKRI via >> petsc-users <petsc-users@mcs.anl.gov> wrote: >> >> Hello, >> >> >> >> I am trying to use the Hypre AMS preconditioner for the first time. >> >> >> >> I am following the example problem from Hypre >> >> >> https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L954__;Iw!!G_uCfscf7eWS!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf73VDWhpc$ >> >> <https://urldefense.us/v3/__https:/github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L954__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9XJ0EWuqr2PidZJdPqbnFzCshQFo-mclGSvGBOPuGSTkjPvMKnIfJzWos7QShcSitpwyrhL5ySgA0XM$> >> >> >> >> I have so far successfully set the discrete gradient operator and vertex >> co-ordinates, >> >> >> >> // Set discrete gradient >> >> petscErr = PCHYPRESetDiscreteGradient(pc, par_G); >> >> >> >> // Set vertex coordinates >> >> petscErr = PCHYPRESetEdgeConstantVectors(pc, par_xvec, par_yvec, >> par_zvec); >> >> >> >> Do I need to set the following smoothing options? >> >> >> https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L965__;Iw!!G_uCfscf7eWS!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf7ymdPBOQ$ >> >> <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$> >> >> >> >> It cannot hurt. I would set them to begin with. >> >> >> >> Also, do I need to convert from MATMPIAIJ to CSR? >> >> >> https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L984__;Iw!!G_uCfscf7eWS!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf7wD78NAo$ >> >> <https://urldefense.us/v3/__https:/github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L984__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9XJ0EWuqr2PidZJdPqbnFzCshQFo-mclGSvGBOPuGSTkjPvMKnIfJzWos7QShcSitpwyrhL53Trv1si$> >> >> >> >> No. >> >> >> >> What are the other PETSc calls to invoke AMS? Is there an example problem >> I can look at? >> >> >> >> I do not know. I don't think we have an example. >> >> >> >> Thanks, >> >> >> >> Matt >> >> >> >> Thank you. >> >> >> >> Karthik. >> >> >> >> -- >> >> *Karthik Chockalingam, Ph.D.* >> >> Senior Research Software Engineer >> >> High Performance Systems Engineering Group >> >> Hartree Centre | Science and Technology Facilities Council >> >> karthikeyan.chockalin...@stfc.ac.uk >> >> >> >> [image: signature_3970890138] >> >> >> >> >> >> >> -- >> >> What most experimenters take for granted before they begin their >> experiments is infinitely more interesting than any results to which their >> experiments lead. >> -- Norbert Wiener >> >> >> >> https://urldefense.us/v3/__https://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf7uDER6bU$ >> >> <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9ZyhqOzc$> >> > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > > https://urldefense.us/v3/__https://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!b8Tv_XEoRSSehhvrYTELfhg0W08IjaDPGx3gkioYVRlIia4rZz7XLH7GXmXmEbathoNXMMfFaU8hWftak1IUQLf7uDER6bU$ > > <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!dM_jKT_vX0NCVNcY9XOTTUaTSW-TF2CgOkB2UDeZ2ztYXapdmLlSBT4XhV7PknN3ewygGWDbKFEP9ZyhqOzc$> > -- Stefano
