On Sun 1. May 2022 at 07:03, Amneet Bhalla <[email protected]> wrote:
> How about using a fixed number of Richardson iterations as a Krylov > preconditioner to a GMRES solver? > That is fine. Would that lead to a linear operation? > Yes. > On Sat, Apr 30, 2022 at 8:21 PM Jed Brown <[email protected]> wrote: > >> In general, no. A fixed number of Krylov iterations (CG, GMRES, etc.) is >> a nonlinear operation. >> >> A fixed number of iterations of a method with a fixed polynomial, such as >> Chebyshev, is a linear operation so you don't need a flexible outer method. >> >> Ramakrishnan Thirumalaisamy <[email protected]> writes: >> >> > Hi, >> > >> > I have a Krylov solver with a preconditioner that is also a Krylov >> solver. >> > I know I can use "fgmres" for the outer solver but can I use gmres for >> the >> > outer solver with a fixed number of iterations in the Krylov >> > preconditioners? >> > >> > >> > Thanks, >> > Rama >> > -- > --Amneet > > > >
