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

[Xiaodong Liu]

Thanks, Patrick. I will try your suggestion  Richardson/SOR.

Xiaodong Liu, PhD
X: Computational Physics Division
Los Alamos National Laboratory
P.O. Box 1663,
Los Alamos, NM 87544
505-709-0534


On Wed, Mar 18, 2020 at 10:34 AM Patrick Sanan <patrick.sanan at gmail.com>
wrote:

> 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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