[Trilinos-Users] Solvers and preconditioners available for Epetra_VbrMatrices

Alberto F. Martín-Huertas amartin at cimne.upc.edu
Thu Sep 15 14:05:06 MDT 2011


 Dear Mike,

 thanks for your quick response.

 Does your comment also apply for
 Stratimikos+Thyra ? In particular, can one wrap
 Thyra abstract linear algebra objects
 around Epetra_VbrRowMatrices ?

 Best regards,
  Alberto.


 On Thu, 15 Sep 2011 19:03:53 +0000, Heroux, Michael A wrote:
> Alberto,
>
> All of the solvers and preconditioners in Trilinos are usable with
> Epetra_VbrMatrix objects.
>
> The iterative solvers will use your VbrMatrix directly and utilize 
> the block
> structure.
>
> However, there are no block entry preconditioners.  All of the
> preconditioners will be constructed as point entry objects.  In fact,
> because of a structural deficiency in Epetra_VbrMatrix, you will need 
> to
> construct an Epetra_VbrRowMatrix object (which is a light-weight 
> wrapper
> around Epetra_VbrMatrix) and pass that to the preconditioner.  It's a 
> single
> line of code, but is required for proper interpretation of the
> Epetra_RowMatrix interface with a VbrMatrix object.
>
> I hope this helps.
>
> Mike
>
>
> On 9/15/11 1:04 PM, "Alberto F. Martín-Huertas" 
> <amartin at cimne.upc.edu>
> wrote:
>
>>  Dear Trilinos-Users,
>
>  is there any reference where I can
>  find which krylov
>> subspace solvers (AztecOO)
>  and preconditioners (ML, Ifpack, AztecOO) are
>> available
>  for variable block row distributed matrices
>  (i.e.,
>> EpetraVbrMatrix).
>
>  Thanks in advance.
>
>  Best regards,
>   Alberto.
>
>
> --
>
>> Alberto F. Martín-Huertas
>  Centre Internacional de Mètodes Numèrics a
>> l'Enginyeria (CIMNE)
>  Parc Mediterrani de la Tecnologia, UPC
>  Esteve Terrades
>> 5, Building C3, Office 210,
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>  Tel.:
>> (+34) 9341 34223
>  e-mail: amartin at cimne.upc.edu
>
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-- 
 Alberto F. Martín-Huertas
 Centre Internacional de Mètodes Numèrics a l'Enginyeria (CIMNE)
 Parc Mediterrani de la Tecnologia, UPC
 Esteve Terrades 5, Building C3, Office 210,
 08860 Castelldefels (Barcelona, Spain)
 Tel.: (+34) 9341 34223
 e-mail: amartin at cimne.upc.edu

 ________________
 IMPORTANT NOTICE
 All personal data contained on this mail will be processed 
 confidentially and registered in a file property of CIMNE in
 order to manage corporate communications. You may exercise the rights 
 of access, rectification, erasure and object by
 letter sent to Ed. C1 Campus Norte UPC. Gran Capitán s/n Barcelona.




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