How about using a fixed number of Richardson iterations as a Krylov
preconditioner to a GMRES solver? Would that lead to a linear operation?
On Sat, Apr 30, 2022 at 8:21 PM Jed Brown wrote:
> In general, no. A fixed number of Krylov iterations (CG, GMRES, etc.) is a
> nonlinear operation.
>
> A
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 writes:
> Hi,
>
>
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
