TSFAmesosSolver.cpp

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#include "TSFAmesosSolver.hpp"
#include "TSFEpetraVector.hpp"
#include "TSFEpetraMatrix.hpp"



#ifndef HAVE_TEUCHOS_EXPLICIT_INSTANTIATION
#include "TSFVectorImpl.hpp"
#include "TSFLinearOperatorImpl.hpp"
#include "TSFLinearSolverImpl.hpp"
#endif

#include "Amesos.h"
#include "Amesos_BaseSolver.h"

using namespace TSFExtended;
using namespace Teuchos;


AmesosSolver::AmesosSolver(const ParameterList& params)
  : LinearSolverBase<double>(params),
    kernel_()
{
  setName("AmesosSolver");
  if (parameters().isParameter("Kernel"))
    {
      kernel_ = getParameter<string>(parameters(), "Kernel");
    }
  else
    {
      kernel_ = "Klu";
    }
}



SolverState<double> AmesosSolver::solve(const LinearOperator<double>& op, 
                                       const Vector<double>& rhs, 
                                       Vector<double>& soln) const
{
  TSFExtended::Vector<double> bCopy = rhs.copy();
  TSFExtended::Vector<double> xCopy = rhs.copy();

  Epetra_Vector* b = EpetraVector::getConcretePtr(bCopy);
  Epetra_Vector* x = EpetraVector::getConcretePtr(xCopy);

  Epetra_CrsMatrix& A = EpetraMatrix::getConcrete(op);

  Epetra_LinearProblem prob(&A, x, b);

  Amesos amFactory;
  RCP<Amesos_BaseSolver> solver 
    = rcp(amFactory.Create("Amesos_" + kernel_, prob));
  TEST_FOR_EXCEPTION(solver.get()==0, std::runtime_error, 
                     "AmesosSolver::solve() failed to instantiate "
                     << kernel_ << "solver kernel");

  int ierr = solver->Solve();
  
  soln = xCopy;

  SolverStatusCode state;
  std::string msg;

  switch(ierr)
    {
    case 0:
      state = SolveConverged;
      msg = "converged";
      break;
    default:
      state = SolveCrashed;
      msg = "amesos failed: ierr=" + Teuchos::toString(ierr);
    }

  SolverState<double> rtn(state, "Amesos solver " + msg, 0, 0);
  return rtn;
}