petsc-3.11.4 2019-09-28
PCSPAISetEpsilon
Set the tolerance for the SPAI preconditioner
Synopsis
#include "petscpc.h"
PetscErrorCode PCSPAISetEpsilon(PC pc,double epsilon1)
Input Parameters
| pc | - the preconditioner
|
| eps | - epsilon (default .4)
|
Notes
Espilon must be between 0 and 1. It controls the
quality of the approximation of M to the inverse of
A. Higher values of epsilon lead to more work, more
fill, and usually better preconditioners. In many
cases the best choice of epsilon is the one that
divides the total solution time equally between the
preconditioner and the solver.
See Also
PCSPAI, PCSetType()
Level
intermediate
Location
src/ksp/pc/impls/spai/ispai.c
Implementations
PCSPAISetEpsilon_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