[Dune] How to use AMG with the constructor given below ?

[Benedikt Oswald]

Dear Dune,

I need to instantiate the AMG preconditioner so that I can specify a specific coarseSolver
since my problem does not work with the default behavior of AMG, i.e.

"Construct an AMG with an inexact coarse solver based on the smoother.

As coarse solver a preconditioned CG method with the smoother as preconditioner will be used. The matrix hierarchy is built automatically."


Thus, I would like to use this constructor

Dune::Amg::AMG< M, X, S, PI, A >::AMG	(	const OperatorHierarchy & 	matrices,
CoarseSolver & 	coarseSolver,
const SmootherArgs & 	smootherArgs,
const Parameters & 	parms	 
)


Now, given my (parallel) BCRS matrix, distributed over the processes, could you please sketch 
the way I should go, i.e. tell me on what other classes to use ?

I have a rough idea that I need to create my own operator hierarchy and I need to specify a coarse
solver, could be a very simple LoopSolver preconditioned by  SeqJac, in fact.

But what exactly must be done ?

I have a look at the AMG tests, but would not understand perfectly well.


Thanks for giving some hints.


Greetings, Benedikt





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Benedikt Oswald, Dr. sc. techn., dipl. El. Ing. ETH, www.psi.ch, Computational Accelerator Scientist, http://amas.web.psi.ch
Paul Scherrer  Institute (PSI), CH-5232 Villigen, Suisse, benedikt.oswald at psi.ch, +41(0)56 310 32 12

"Passion is required for any great work, and for the revolution passion and audacity are required in big doses.",
 Ernesto 'Che' Guevara, Letter to his parents.
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