[petsc-users] Does Petsc provide the non-KSP iterative solver, e.g., SOR, for a linear system.

[Patrick Sanan]

I may not be interpreting the question correctly, but you can use SOR as
the only preconditioner, e.g.

    -ksp_type gmres -pc_type sor

or you can use Richardson/SOR as your multigrid smoother, which might be
what you're asking for

     -ksp_type gmres -pc_type mg -pc_mg_levels 3
    -mg_levels_ksp_type richardson -mg_levels_pc_type SOR



Am Mi., 18. März 2020 um 18:19 Uhr schrieb Xiaodong Liu <xliu29 at ncsu.edu>:

> Hi, Petsc team,
>
> I am doing something using multigrid as a preconditioner for GMRES. From
> the official case,
>
> most use KSP (Chebyshev) and PC (SOR) for solving the preconditioning
> system for every level of multigrid except the coarse one.
>
> -ksp_type gmres -pc_type mg -pc_mg_levels 3
> -mg_levels_ksp_type Chebyshev -mg_levels_pc_type SOR
>
>  I would like to  use SOR for solving the preconditioning system directly.
> I can not find that Petsc supports non-KSP iterative solver for a linear
> system, right?
>
> If I am wrong, please let me know.
>
> Xiaodong Liu, PhD
> X: Computational Physics Division
> Los Alamos National Laboratory
> P.O. Box 1663,
> Los Alamos, NM 87544
> 505-709-0534
>
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