KSPChebyshevEstEigSetUseNoisy

use a noisy random number generated right-hand side to estimate 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

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