Dear Bruno, Thank you for your response.
On Friday, February 14, 2020 at 2:34:41 PM UTC+1, Bruno Turcksin wrote: > > Paras, > > You could try to use SuperLU_MT (see > https://portal.nersc.gov/project/sparse/superlu/) but we don't have > wrapper for it. The Krylov solver in deal.II are multithreaded but the > preconditioners are not. What you can try is to use deal.II solvers and > STRUMPACK (https://github.com/pghysels/STRUMPACK) for the preconditioner > but again we don't have wrapper for it. > > Best, > > Bruno > A bit more search let to the fact that the SuperLu-MT solver is also available in Trilinos-Ameso2 package (see https://docs.trilinos.org/latest-release/packages/amesos2/doc/html/classAmesos2_1_1Superlumt.html#a102812eafbb572475b7330b825809b09). The current code uses dealii::SparseMatrix<double> and dealii::Vector<double> objects to store the system matrix and, the solution and rhs vectors respectively. In order to test it out, my idea was to use a dealii::TrilinosWrappers::SparseMatrix (which would be reinit from the already assembled dealii::SparseMatrix) and then extract the underlying matrix (using the TrilinosWrappers::SparseMatrix::trilinos_matrix() function) for use with the Superlu-MT solver. This works fine. For the vectors (solution & rhs), the idea was to copy the values from the dealii::Vector to dealii::LinearAlgebra::EpetraWrappers::Vector. As an intermediate step I first copy the dealii::Vector to dealii::LinearAlgebra::Vector<doule> using the constructor : https://www.dealii.org/current/doxygen/deal.II/classLinearAlgebra_1_1Vector.html#af441b2c23134f8e6e08c833f918888a2. This works fine. However, when I try to call dealii::LinearAlgebra::EpetraWrappers::Vector::reinit(dealii::LinearAlgebra::Vector<doule>) the following error occurs: An error occurred in line <85> of file </opt/spack/var/spack/stage/dealii-9.0.1-ssxm6qr7mlmymdmjssazlr4s32qar5cv/dealii-9.0.1/source/lac/trilinos_epetra_vector.cc> in function virtual void dealii::LinearAlgebra::EpetraWrappers::Vector::reinit(const dealii::LinearAlgebra::VectorSpaceVector<double>&, bool) The violated condition was: dynamic_cast<const Vector *>(&V)!=nullptr Additional information: (none) Stacktrace: ----------- #0 /opt/spack/opt/spack/linux-ubuntu18.04-x86_64/gcc-7.3.0/dealii-9.0.1-ssxm6qr7mlmymdmjssazlr4s32qar5cv/lib/libdeal_II.g.so.9.0.1: dealii::LinearAlgebra::EpetraWrappers::Vector::reinit(dealii::LinearAlgebra::VectorSpaceVector<double> const&, bool) #1 /calculate/Paras_Work/PhD_Work/FRASCAL-CODE/MNC-Frac/_build/libmncfrac.so: std::pair<unsigned int, double> mncfrac::Solve_linearEquationSystem<2u, double>(mncfrac::LinearAlgebraItems<double>&, mncfrac::buildingblocks::inputreader::LinearSolverParameters const&, dealii::Vector<double>&) #2 ./variants/homogenization: mncfrac::homogenization::RVE<2u, double>::Solve_timeStep(dealii::Tensor<2, 2, double> const&, mncfrac::utilities::BoundaryConditionType const&, dealii::Vector<double>&) #3 ./variants/homogenization: mncfrac::homogenization::RVE<2u, double>::Homogenize(dealii::Tensor<2, 2, double> const&, mncfrac::utilities::BoundaryConditionType) #4 ./variants/homogenization: main I could not understand why does the conversion fails? Could you please help me understand where am I doing wrong. Any better alternatives you would suggest? It is clear that copying matrices and vectors for each solver call is probably not very efficient, but this is just for trying out the solver. Best regards, Paras -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/9384e043-e49c-42e6-b72b-a08328addb62%40googlegroups.com.
