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

[Benedikt Oswald]

Hello Markus, one more question: since I have complex values matrices,

i.e. Dune::BCRSMatrix<FieldMatrix<ComplexValueType,1,1> >

how will Dune's SuperLU connection react to this ?

Will it automatically choose the complex variant of SuperLU ?

Thanks and greetings, Benedikt


On Nov 22, 2011, at 8:02 PM, Markus Blatt wrote:

> Hi Benedikt,
> 
> 
> On Tue, Nov 22, 2011 at 04:44:31PM +0100, Benedikt Oswald wrote:
>> 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	 
>> )
> 
> May I ask why you cannot live with the default behaviour?
> 
> If you have parmetis and SuperLU installed, the default behaviour is
> to agglomerate the data  onto fewer processor until eventualy all data
> on the coarsest level is on only one processor. To solve this coarse
> level system  SuperLU is solved.
> 
> I always used this approach.
> 
> If that is not sufficient, I need to take a look at the code for
> specifying the coarsesolver, which I fear has not been tested lately.
> 
> Cheers,
> 
> Markus
> 
> -- 
> Do you need more support with DUNE or HPC in general? 
> 
> Dr. Markus Blatt - HPC-Simulation-Software & Services http://www.dr-blatt.de
> Rappoltsweilerstr. 5, 68229 Mannheim, Germany
> Tel.: +49 (0) 160 97590858  Fax: +49 (0)322 1108991658 
> 
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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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