PETSc version 3.15.5
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
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Index of all manual pages