KSPChebyshevEstEigSetUseNoisy#

use a noisy right hand side in order to do the estimate of the extreme eigenvalues instead of the given right hand side

Synopsis#

#include "petscksp.h" 
PetscErrorCode KSPChebyshevEstEigSetUseNoisy(KSP ksp, PetscBool use)

Logically Collective

Input Parameters#

  • ksp - linear solver context

  • use - PETSC_TRUE to use noisy

Options Database Key#

  • -ksp_chebyshev_esteig_noisy <true,false> - Use noisy right hand side for estimate

Note#

This allegedly works better for multigrid smoothers

See Also#

KSP: Linear System Solvers, KSPCHEBYSHEV, KSPChebyshevEstEigSet(), KSPChebyshevEstEigGetKSP()

Level#

intermediate

Location#

src/ksp/ksp/impls/cheby/cheby.c

Implementations#

KSPChebyshevEstEigSetUseNoisy_Chebyshev() in src/ksp/ksp/impls/cheby/cheby.c

Index of all KSP routines
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Index of all manual pages