PCBJacobiGetSubKSP

Gets the local KSP contexts for all blocks on this processor.

Synopsis

#include "petscpc.h" 
PetscErrorCode PCBJacobiGetSubKSP(PC pc, PetscInt *n_local, PetscInt *first_local, KSP *ksp[])

Not Collective

Input Parameter

• pc - the preconditioner context

Output Parameters

• n_local - the number of blocks on this processor, or NULL

• first_local - the global number of the first block on this processor, or NULL

• ksp - the array of KSP contexts

Notes

After PCBJacobiGetSubKSP() the array of KSP contexts is not to be freed.

Currently for some matrix implementations only 1 block per processor is supported.

You must call KSPSetUp() or PCSetUp() before calling PCBJacobiGetSubKSP().

Fortran Usage

You must pass in a KSP array that is large enough to contain all the local KSPs.

You can call PCBJacobiGetSubKSP(pc,nlocal,firstlocal,PETSC_NULL_KSP,ierr) to determine how large the KSP array must be.

See Also

PCBJACOBI, PCASM, PCASMGetSubKSP()

Level

advanced

Location

src/ksp/pc/impls/bjacobi/bjacobi.c

Examples

src/ksp/ksp/tutorials/ex7.c
src/ksp/ksp/tutorials/ex7f.F90
src/snes/tutorials/ex3.c

Implementations

PCBJacobiGetSubKSP_BJacobi in src/ksp/pc/impls/bjacobi/bjacobi.c

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