PCGASMGetSubKSP

Gets the local KSP contexts for all subdomains on this MPI rank.

Synopsis

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

Collective iff first_local is requested

Input Parameter

• pc - the preconditioner context

Output Parameters

• n_local - the number of blocks on this MPI rank or NULL

• first_local - the global number of the first block on this rank or NULL, all ranks must request or all must pass NULL

• ksp - the array of KSP contexts

Note

After PCGASMGetSubKSP() the array of KSPes is not to be freed

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

You must call KSPSetUp() before calling PCGASMGetSubKSP().

See Also

KSP: Linear System Solvers, PCGASM, PCGASMSetSubdomains(), PCGASMSetOverlap(), PCGASMCreateSubdomains2D(),

Level

advanced

Location

src/ksp/pc/impls/gasm/gasm.c

Examples

src/ksp/ksp/tutorials/ex62.c

Implementations

PCGASMGetSubKSP_GASM() in src/ksp/pc/impls/gasm/gasm.c

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