Hi users and developers,
Summer greetings from Delft.
For the system Au = f, I want to apply a multilevel preconditioner with a KSP
(say FGMRES) . The preconditioner
reads as
Prec = C +? M^-1 (I - A*C) , where
* ?C reads coarse grid correction operator i.e. C =? P*A_2h\R? [ R?
restriction, A_2h coarse operator, P interpolation]
* M is say some sparse matrix (resembling to A)
What makes it multilevel is I have to approximate coarse operator "A_2h" with
few KSP iterations preconditioned by the above defined
preconditioner "Prec" , but off course at the level 2h and hence at every
coarse level until coarsest.
I only know, it can be implemented with PCMG. I am little afraid of DMMG.
Explanatory suggestions to customize PCMG for what is required are very
appreciated.
Thanks in advance.?
regards, Abdul
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