[Trilinos-Users] [EXTERNAL] NOX using direct solver MUMPS

[Heroux, Mike]

Simon,

Regarding question 2, there is no support for storing only the upper or
lower part.  It is fairly easy to support this mode for sparse
matrix-vector multiplication since Epetra supports transpose
multiplication, but if you want to use any Trilinos preconditioner, the
full upper and lower part will be expected.  What kind of preconditioner
are you thinking of using?

Mike

On 5/23/12 4:28 PM, "Simon-Nicolas Roth" <simon.roth at videotron.ca> wrote:

>OK,
>
>It actually worked by directly usign the parameter:
>
>("Amesos Solver", "Amesos_Mumps");
>
>in the "Linear Solver" sublist.
>
>Any clues about the second questions which is rather simple, but I can't
>seem 
>to find th answer...
>
>Regards
>Simon
>
>
>On Wednesday 23 May 2012 12:40:35 Roger Pawlowski wrote:
>> Hi Simon,
>> 
>> In regards to question #1, Amesos can be used by NOX via the stratimikos
>> interface to linear solvers.  NOX uses the stratimikos interface in both
>> the src-thyra and src-epetra (NOX_Epetra_LinearSystem_Stratimikos.H)
>> layers.  You could use either to get access to Amesos/MUMPS in NOX.
>> There are no concrete examples using Amesos in NOX, but it should work.
>> 
>> Roger
>> 
>> On 05/23/2012 10:36 AM, Simon-Nicolas Roth wrote:
>> > Hi,
>> > 
>> > I have to simple questions:
>> > 
>> > 1- Is it possible to use a direct solver such as MUMPS inside NOX;
>> > 
>> > 2- Is it possible to assemble only half the matrix (lower or upper
>>part)
>> > using Epetra_FECrsMatrix if the matrix is symmetric positive definite
>> > when solving with Aztecoo or Belos?
>> > 
>> > Best regards
>> > Simon
>> > 
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