-ksp_chebychev_eigenvalues <emin,emax> | - set approximations to the smallest and largest eigenvalues of the preconditioned operator. If these are accurate you will get much faster convergence. | |
-ksp_chebychev_estimate_eigenvalues <a,b,c,d> | - estimate eigenvalues using a Krylov method, then use this transform for Chebychev eigenvalue bounds (KSPChebychevSetEstimateEigenvalues) |
Notes: The Chebychev method requires both the matrix and preconditioner to be symmetric positive (semi) definite. Only support for left preconditioning.
Level:beginner
Location:src/ksp/ksp/impls/cheby/cheby.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages