PCSPAISetSp

specify a symmetric matrix sparsity pattern in the PCSPAI preconditioner

Synopsis

#include "petscpc.h" 
PetscErrorCode PCSPAISetSp(PC pc, PetscInt sp)

Input Parameters

• pc - the preconditioner

• sp - 0 or 1

Note

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

KSP: Linear System Solvers, PCSPAI, PCSetType()

Level

intermediate

Location

src/ksp/pc/impls/spai/ispai.c

Implementations

PCSPAISetSp_SPAI() in src/ksp/pc/impls/spai/ispai.c

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Index of all PC routines
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Index of all manual pages