petsc-3.10.5 2019-03-28
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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
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Index of all manual pages