>________________________________
> From: Jed Brown <jedbrown at mcs.anl.gov>
>To: Abdul Hanan Sheikh <hanangul12 at yahoo.co.uk>
>Cc: PETSc users list <petsc-users at mcs.anl.gov>
>Sent: Thursday, 5 April 2012, 20:17
>Subject: Re: [petsc-users] Implementation of Multilevel preconditioner
>
>
>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).Thanks. and cleared!
>
>
>Post-smoothing context details would be appreciated!?
>To my understing, those would be:?
>1 post-smoothing iteration with?
>KSP type Richardson?
>PC type to be applied on M is PCShellForM (say there PCLU in PCShellForM,
>though I need to change this, so I say this) .?
>
>
>This will complete my preconditioner "Prec" ???
>
>
>Bundle of thanks,?
>Abdul?
>
>
>
>
>
>
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