[Trilinos-Users] Solvers and preconditioners available for Epetra_VbrMatrices
Heroux, Mike
MHeroux at csbsju.edu
Thu Sep 15 15:22:20 MDT 2011
Yes, this should be possible since Thyra expects an Epetra_RowMatrix as
input. Again, in order to use a VbrMatrix for setting up a preconditioner
you will need to wrap it in Epetra_VbrRowMatrix.
Mike
On 9/15/11 3:05 PM, "Alberto F. Martín-Huertas" <amartin at cimne.upc.edu>
wrote:
> 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,
> 08860
> Castelldefels (Barcelona, Spain)
> 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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