> On Feb 14, 2017, at 12:38 PM, Bernardo Rocha <[email protected]>
> wrote:
>
> Dear Petsc users,
>
> I would like to use BoomerAMG preconditioner for a system of PDEs, but we are
> interested in setting some of BoomerAMG options to use the nodal systems
> coarsening.
>
> From the HYPRE/BoomerAMG manual, I found out that I have to use the following
> functions:
> HYPRE_BoomerAMGSetNodal
ierr = PetscOptionsInt("-pc_hypre_boomeramg_nodal_coarsen","Use a nodal
based coarsening 1-6","HYPRE_BoomerAMGSetNodal",jac->nodal_coarsening,
&jac->nodal_coarsening,&flg);CHKERRQ(ierr);
if (flg) {
PetscStackCallStandard(HYPRE_BoomerAMGSetNodal,(jac->hsolver,jac->nodal_coarsening));
}
> HYPRE_BoomerAMGSetNumFunctions
Set the block size of the matrix; this information is then transferred
automatically to hypre. Note that you can set a block size even for AIJ
matrices.
> HYPRE_BoomerAMGSetDofFunc
I could not find an indication of that this is suppose to be setting; it is
mentioned in the users manual but I don't know what it means. It looks like it
takes an integer array but I don't even know how long that array is.
If you figure out what it means and can add support for it we'll take it as
a pull request.
barry
>
> Looking at the source code (src/ksp/pc/impls/hypre/hypre.c) I've found the
> call to the first one, but not for the other two, where I must specify the
> ordering of my dofs in my problem.
>
> I would appreciate any help on this.
>
> Best regards,
> Bernardo
