[petsc-users] Projection preconditioner as PCMG

[Jed Brown]

On Thu, Mar 8, 2012 at 14:16, Abdul Hanan Sheikh <hanangul12 at yahoo.co.uk>wrote:

> I almost got you; and thus I got my preconditoner  Prec = \lambda_max*C +
> (I - AC) .
> Only question is : how to make S = I. S is my post_smoother in PCMG
> framwork and post_smoother
> is a KSP_POST context with PC_POST ?
> Does following choices make S =I;
> KSP_POST => RICHARDSON
> PC_POST => PCNONE


Yes, you are asking for one post-smoothing Richardson iteration with no
preconditioner. That is what I demonstrated in the command line options of
my earlier message.
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