[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
>
>  ________________
>  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.
>
>
>
> _______________________________________________
> Trilinos-Users
>> mailing
>>
> list
> Trilinos-Users at software.sandia.gov
>
> http://software.sandia.gov/mailman/lis
>> tinfo/trilinos-users

-- 
 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.


_______________________________________________
Trilinos-Users
> mailing 
> list
Trilinos-Users at software.sandia.gov
http://software.sandia.gov/mailman/lis
> tinfo/trilinos-users






More information about the Trilinos-Users mailing list