petsc-3.11.4 2019-09-28
PCSPAISetSp
specify a symmetric matrix sparsity pattern in the SPAI preconditioner
Synopsis
#include "petscpc.h"
PetscErrorCode PCSPAISetSp(PC pc,int sp)
Input Parameters
| pc | - the preconditioner
|
| n | - 0 or 1
|
Notes
If A has a symmetric nonzero pattern use -sp 1 to
improve performance by eliminating some communication
in the parallel version. Even if A does not have a
symmetric nonzero pattern -sp 1 may well lead to good
results, but the code will not follow the published
SPAI algorithm exactly.
See Also
PCSPAI, PCSetType()
Level
intermediate
Location
src/ksp/pc/impls/spai/ispai.c
Implementations
PCSPAISetSp_SPAI in src/ksp/pc/impls/spai/ispai.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages