Matthew Knepley <[email protected]> writes: > On Fri, Jun 22, 2018 at 1:47 PM Boyce Griffith <[email protected]> > wrote: > >> Can you set up the preconditioner so that you can just use GMRES? >> > > So I think what Boyce is saying is, can't you fix the number of iterates in > the inner Krylov solvers so that it becomes a linear > operator and you can use GMRES?
A fixed number of Krylov iterations is not a linear operation. A fixed number of Chebyshev iterations (or other method that applies a constant polynomial) is linear.
