whether do I need to consider the symmetric preconditioner when using CG?

[Lisandro Dalcin]

KSPCG only supports left preconditioning.

On 1/16/08, Yujie <recrusader at gmail.com> wrote:
> hi, everyone
>
> I know there are three types of preconditioners, that is left, split and
> right preconditioners? When I use CG method in PETSc, whether do I need to
> consider select one type of preconditioner? Whether do different types
> affect the performance of preconditioned CG? thanks a lot.
>
> Regards,
> Yujie
>


-- 
Lisandro Dalcín
---------------
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