[petsc-users] New Fortran API to PCFieldSplitGetSubKSP
Pierre Jolivet
pierre at joliv.et
Tue Jul 1 11:58:58 CDT 2025
Dear Nicolas,
> On 1 Jul 2025, at 6:31 PM, TARDIEU Nicolas via petsc-users <petsc-users at mcs.anl.gov> wrote:
>
> Dear PETSc team,
>
> I am having hard time upgrading our code's interface to the new Fortran API...
> For instance, I lack a Fortran example of the use of PCFieldSplitGetSubKSP. The doc says "You must pass in a KSP array that is large enough to contain all the KSPs" but the interface file is :
>
> subroutine PCFieldSplitGetSubKSP(a,b,c, z)
> import tPC,tKSP
> PC :: a
> PetscInt :: b
> KSP, pointer :: c(:)
> PetscErrorCode z
> end subroutine
> end interface
>
> Does it mean that I have to allocate an array of KSP before calling the routine ?
Yes.
> It seems to me that the other new interfaces take care of allocating the output object. PCBJacobiGetSubKSP does it.
They do not work the same behind the scene (because for fieldsplit, in the internal structure, the sub KSP are not necessarily stored in a contiguous array), and so they are not strictly equivalent.
Thanks,
Pierre
> Thanks in advance,
>
> Nicolas
> --
> Nicolas Tardieu
>
> Ing PhD Computational Mechanics
>
> EDF - R&D Dpt ERMES
>
> PARIS-SACLAY, FRANCE
>
>
>
>
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