[Trilinos-Users] Komplex vs. Epetra_LocalMap

[Przemysław Kłosiewicz]

Dear all

I am solving a moderately sized complex linear system Ax = b using Amesos. In order to obtain an equivalent real-valued formulation I use Komplex which needs re(A), im(A), re(b), etc... separately.
As long as I use a regular Epetra_Map for these matrices & vectors all goes well. However, for some well-defined reason I don't want these matrices to be distributed so I tried using an Epetra_LocalMap (or an Epetra_Map with NumGlobalElements = NumMyElements).
This is where Komplex fails: During the creation of a Komplex_LinearProblem from matrices created with such maps I get the following exception:

/home/pklosiew/trilinos-10.6.0-Source/packages/komplex/src/Komplex_LinearProblem.cpp:291:
Throw number = 1
Throw test that evaluated to true: KomplexMatrix_->InsertGlobalValues(Row, NumIndices, Values, Indices)<0

This only happens when running with mpi and where the number of processors > 1.

I have the impression Komplex tries to create double-sized distributed maps from the original map, even though they should stay local.
Is this a bug, a feature or am I misusing the Epetra_LocalMap?

Thanks,
Przemek.


(ps: the reason why I don't want Ax=b to be distributed is that I need to solve these systems for a range of parameters p, as in: A(p)x = b(p) which can all be done in parallel with minimal communication.)


--
Przemyslaw Klosiewicz
PhD Student @ CoMP Research Group
Department of Mathematics and Computer Science, University of Antwerp
Middelheimlaan 1, 2020 Antwerp, Belgium

Office (G2.07):  T (+32) 3 265 32 80, F (+32) 3 265 37 77, E Przemyslaw.Klosiewicz at ua.ac.be
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