[petsc-users] Implementation of Multilevel preconditioner

[Jed Brown]

On Thu, Apr 5, 2012 at 11:12, Abdul Hanan Sheikh <hanangul12 at yahoo.co.uk>wrote:

> Recursive two level multigrid  (by using PCMG with my desired stuff in it,
> in PCSHELL) is okay. I will do it recursively.
> No Problem with recursion and nested iterations.
> Coming to two level,
> How can I get exactly Prec = C +  M^-1 (I - A*C) in a two level multigrid
> ?
> What should be specific choice of pre_smoother_ksp_context and
> post_smoother_ksp_context
> to get the "Prec" ?
> what operators should be chosen in these two ksp contexts ?
>

This is just -pc_mg_type kaskade (zero pre-smoothing iterations, one
post-smoothing iteration).
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