PCGAMGSetRecomputeEstEig#
Set flag for Chebyshev smoothers to recompute the eigen estimates when a new matrix is used
Synopsis#
#include "petscpc.h"
#include "petscksp.h"
PetscErrorCode PCGAMGSetRecomputeEstEig(PC pc, PetscBool b)
Collective
Input Parameters#
pc - the preconditioner context
b - flag, default is
PETSC_TRUE
Options Database Key#
-pc_gamg_recompute_esteig
- use the eigen estimate
Note#
If the matrix changes only slightly in a new solve using PETSC_FALSE will save time in the setting up of the preconditioner
and may not affect the solution time much.
See Also#
the Users Manual section on PCGAMG, the Users Manual section on PCMG, KSP: Linear System Solvers, PCGAMG, KSPChebyshevSetEigenvalues(), KSPChebyshevEstEigSet()
Level#
advanced
Location#
Implementations#
PCGAMGSetRecomputeEstEig_GAMG() in src/ksp/pc/impls/gamg/gamg.c
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