void solve_system_belos(
RCP<Xpetra::Matrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > & A,
RCP<Xpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node> > & X,
RCP<Xpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node> > & B,
Teuchos::ParameterList & MueLuList,
const std::string & belos_solver,
RCP<Teuchos::ParameterList> & SList) {
using Teuchos::RCP;
using Teuchos::rcp;
typedef Tpetra::Operator<Scalar,LocalOrdinal,GlobalOrdinal,Node> Tpetra_Operator;
typedef Tpetra::CrsMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> Tpetra_CrsMatrix;
typedef Tpetra::Experimental::BlockCrsMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> Tpetra_BlockCrsMatrix;
typedef Xpetra::TpetraBlockCrsMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> Xpetra_TpetraBlockCrsMatrix;
typedef Tpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node> Tpetra_Vector;
typedef Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> Tpetra_MultiVector;
RCP<Tpetra_Operator> At = MueLu::Utilities<Scalar,LocalOrdinal,GlobalOrdinal,Node>::Op2NonConstTpetraRow(A);
RCP<Tpetra_Operator> Mt = MueLu::CreateTpetraPreconditioner(At,MueLuList);
RCP<Tpetra_MultiVector> Xt = Xpetra::toTpetra(*X);
RCP<Tpetra_MultiVector> Bt = Xpetra::toTpetra(*B);
if(Xt.is_null() || Bt.is_null() || At.is_null() || Mt.is_null()) throw std::runtime_error("ERROR: Xpetra to Tpetra conversion failed");
typedef Tpetra_MultiVector MV;
typedef Tpetra_Operator OP;
RCP<Belos::LinearProblem<Scalar,MV,OP> > belosProblem = rcp(new Belos::LinearProblem<Scalar,MV,OP>(At, Xt, Bt));
belosProblem->setLeftPrec(Mt);
belosProblem->setProblem(Xt,Bt);
Belos::SolverFactory<Scalar, MV, OP> BelosFactory;
Teuchos::RCP<Belos::SolverManager<Scalar, MV, OP> > BelosSolver = BelosFactory.create(belos_solver, SList);
BelosSolver->setProblem(belosProblem);
BelosSolver->solve();
}
// --------------------------------------------------------------------------------------
void solve_system_list(Xpetra::UnderlyingLib & lib, RCP<Matrix> & A, RCP<Vector>& X, RCP<Vector> & B, Teuchos::ParameterList & MueLuList, RCP<Teuchos::ParameterList> & SList) {
using Teuchos::RCP;
using Teuchos::rcp;
#ifdef HAVE_MUELU_BELOS
#ifdef HAVE_MUELU_TPETRA
typedef Tpetra::Operator<SC,LO,GO> Tpetra_Operator;
typedef Tpetra::CrsMatrix<SC,LO,GO> Tpetra_CrsMatrix;
typedef Tpetra::Vector<SC,LO,GO> Tpetra_Vector;
typedef Tpetra::MultiVector<SC,LO,GO> Tpetra_MultiVector;
if(lib==Xpetra::UseTpetra) {
RCP<Tpetra_CrsMatrix> At = Xpetra::MatrixMatrix::Op2NonConstTpetraCrs(A);
RCP<Tpetra_Operator> Mt = MueLu::CreateTpetraPreconditioner(At,MueLuList);
RCP<Tpetra_MultiVector> Xt = Xpetra::toTpetra(*X);
RCP<Tpetra_MultiVector> Bt = Xpetra::toTpetra(*B);
typedef Tpetra_MultiVector MV;
typedef Tpetra_Operator OP;
RCP<Belos::LinearProblem<SC,MV,OP> > belosProblem = rcp(new Belos::LinearProblem<SC,MV,OP>(At, Xt, Bt));
belosProblem->setRightPrec(Mt);
belosProblem->setProblem(Xt,Bt);
Belos::SolverFactory<SC, MV, OP> BelosFactory;
Teuchos::RCP<Belos::SolverManager<SC, MV, OP> > BelosSolver = BelosFactory.create(std::string("CG"), SList);
BelosSolver->setProblem(belosProblem);
Belos::ReturnType result = BelosSolver->solve();
if(result==Belos::Unconverged)
throw std::runtime_error("Belos failed to converge");
}
#endif
#ifdef HAVE_MUELU_EPETRA
if(lib==Xpetra::UseEpetra) {
RCP<Epetra_CrsMatrix> Ae = Xpetra::MatrixMatrix::Op2NonConstEpetraCrs(A);
RCP<Epetra_Operator> Me = MueLu::CreateEpetraPreconditioner(Ae,MueLuList);
RCP<Epetra_MultiVector> Xe = rcp(&Xpetra::toEpetra(*X),false);
RCP<Epetra_MultiVector> Be = rcp(&Xpetra::toEpetra(*B),false);
typedef Epetra_MultiVector MV;
typedef Epetra_Operator OP;
RCP<Belos::LinearProblem<SC,MV,OP> > belosProblem = rcp(new Belos::LinearProblem<SC,MV,OP>(Ae, Xe, Be));
Teuchos::RCP<Belos::EpetraPrecOp> PrecWrap = Teuchos::rcp(new Belos::EpetraPrecOp(Me));
belosProblem->setRightPrec(PrecWrap);
belosProblem->setProblem(Xe,Be);
Belos::SolverFactory<SC, MV, OP> BelosFactory;
Teuchos::RCP<Belos::SolverManager<SC, MV, OP> > BelosSolver = BelosFactory.create(std::string("CG"), SList);
BelosSolver->setProblem(belosProblem);
Belos::ReturnType result = BelosSolver->solve();
if(result==Belos::Unconverged)
throw std::runtime_error("Belos failed to converge");
}
#endif
#endif // #ifdef HAVE_MUELU_BELOS
}
//-----------------------------------------------------------------------------
void BelosKrylovSolver::init(const std::string& method)
{
Teuchos::RCP<Teuchos::ParameterList> dummy_params = Teuchos::parameterList();
std::string method_name = method;
if (method=="default")
method_name = "GMRES";
Belos::SolverFactory<double, TpetraVector::vector_type, op_type> factory;
_solver = factory.create(method_name, dummy_params);
_problem = Teuchos::rcp(new problem_type);
}
//-----------------------------------------------------------------------------
std::map<std::string, std::string> BelosKrylovSolver::methods()
{
Belos::SolverFactory<double, TpetraVector::vector_type, op_type> factory;
Teuchos::Array<std::string> methods = factory.supportedSolverNames();
std::map<std::string, std::string> result;
result.insert(std::make_pair("default", "default method"));
for (auto &m : methods)
{
for (auto &c : m)
c = std::tolower(c);
result.insert(std::make_pair(m, m));
}
return result;
}
int
main (int argc, char *argv[])
{
using Teuchos::inOutArg;
using Teuchos::ParameterList;
using Teuchos::parameterList;
using Teuchos::RCP;
using Teuchos::rcp;
using Teuchos::rcpFromRef;
using std::endl;
typedef double ST;
typedef Epetra_Operator OP;
typedef Epetra_MultiVector MV;
typedef Belos::OperatorTraits<ST,MV,OP> OPT;
typedef Belos::MultiVecTraits<ST,MV> MVT;
// This calls MPI_Init and MPI_Finalize as necessary.
Belos::Test::MPISession session (inOutArg (argc), inOutArg (argv));
RCP<const Epetra_Comm> comm = session.getComm ();
bool success = false;
bool verbose = false;
try {
int MyPID = comm->MyPID ();
//
// Parameters to read from command-line processor
//
int frequency = -1; // how often residuals are printed by solver
int numRHS = 1; // total number of right-hand sides to solve for
int maxIters = 13000; // maximum number of iterations for solver to use
std::string filename ("bcsstk14.hb");
double tol = 1.0e-5; // relative residual tolerance
//
// Read in command-line arguments
//
Teuchos::CommandLineProcessor cmdp (false, true);
cmdp.setOption ("verbose", "quiet", &verbose, "Print messages and results.");
cmdp.setOption ("frequency", &frequency, "Solvers frequency for printing "
"residuals (#iters).");
cmdp.setOption ("tol", &tol, "Relative residual tolerance used by MINRES "
"solver.");
cmdp.setOption ("filename", &filename, "Filename for Harwell-Boeing test "
"matrix.");
cmdp.setOption ("num-rhs", &numRHS, "Number of right-hand sides to solve.");
cmdp.setOption ("max-iters", &maxIters, "Maximum number of iterations per "
"linear system (-1 means \"adapt to problem/block size\").");
if (cmdp.parse (argc,argv) != Teuchos::CommandLineProcessor::PARSE_SUCCESSFUL) {
return EXIT_FAILURE;
}
Teuchos::oblackholestream blackHole;
std::ostream& verbOut = (verbose && MyPID == 0) ? std::cout : blackHole;
//
// Generate the linear system(s) to solve.
//
verbOut << "Generating the linear system(s) to solve" << endl << endl;
RCP<Epetra_CrsMatrix> A;
RCP<Epetra_MultiVector> B, X;
RCP<Epetra_Map> rowMap;
try {
// This might change the number of right-hand sides, if we read in
// a right-hand side from the Harwell-Boeing file.
Belos::Util::createEpetraProblem (filename, &rowMap, &A, &B, &X, &MyPID, numRHS);
} catch (std::exception& e) {
TEUCHOS_TEST_FOR_EXCEPTION (true, std::runtime_error,
"Failed to create Epetra problem for matrix "
"filename \"" << filename << "\". "
"createEpetraProblem() reports the following "
"error: " << e.what());
}
//
// Compute the initial residual norm of the problem, so we can see
// by how much it improved after the solve.
//
std::vector<double> initialResidualNorms (numRHS);
std::vector<double> initialResidualInfNorms (numRHS);
Epetra_MultiVector R (*rowMap, numRHS);
OPT::Apply (*A, *X, R);
MVT::MvAddMv (-1.0, R, 1.0, *B, R); // R := -(A*X) + B.
MVT::MvNorm (R, initialResidualNorms);
MVT::MvNorm (R, initialResidualInfNorms, Belos::InfNorm);
if (verbose) {
verbOut << "Initial residual 2-norms: \t";
for (int i = 0; i < numRHS; ++i) {
verbOut << initialResidualNorms[i];
if (i < numRHS-1) {
verbOut << ", ";
}
}
verbOut << endl << "Initial residual Inf-norms: \t";
for (int i = 0; i < numRHS; ++i) {
verbOut << initialResidualInfNorms[i];
if (i < numRHS-1) {
verbOut << ", ";
}
}
verbOut << endl;
}
std::vector<double> rhs2Norms (numRHS);
std::vector<double> rhsInfNorms (numRHS);
MVT::MvNorm (*B, rhs2Norms);
MVT::MvNorm (*B, rhsInfNorms, Belos::InfNorm);
if (verbose) {
verbOut << "Right-hand side 2-norms: \t";
for (int i = 0; i < numRHS; ++i) {
verbOut << rhs2Norms[i];
if (i < numRHS-1) {
verbOut << ", ";
}
}
verbOut << endl << "Right-hand side Inf-norms: \t";
for (int i = 0; i < numRHS; ++i) {
verbOut << rhsInfNorms[i];
if (i < numRHS-1) {
verbOut << ", ";
}
}
verbOut << endl;
}
std::vector<double> initialGuess2Norms (numRHS);
std::vector<double> initialGuessInfNorms (numRHS);
MVT::MvNorm (*X, initialGuess2Norms);
MVT::MvNorm (*X, initialGuessInfNorms, Belos::InfNorm);
if (verbose) {
verbOut << "Initial guess 2-norms: \t";
for (int i = 0; i < numRHS; ++i) {
verbOut << initialGuess2Norms[i];
if (i < numRHS-1) {
verbOut << ", ";
}
}
verbOut << endl << "Initial guess Inf-norms: \t";
for (int i = 0; i < numRHS; ++i) {
verbOut << initialGuessInfNorms[i];
if (i < numRHS-1) {
verbOut << ", ";
}
}
verbOut << endl;
}
//
// Compute the infinity-norm of A.
//
const double normOfA = A->NormInf ();
verbOut << "||A||_inf: \t" << normOfA << endl;
//
// Compute ||A|| ||X_i|| + ||B_i|| for each right-hand side B_i.
//
std::vector<double> scaleFactors (numRHS);
for (int i = 0; i < numRHS; ++i) {
scaleFactors[i] = normOfA * initialGuessInfNorms[i] + rhsInfNorms[i];
}
if (verbose) {
verbOut << "||A||_inf ||X_i||_inf + ||B_i||_inf: \t";
for (int i = 0; i < numRHS; ++i) {
verbOut << scaleFactors[i];
if (i < numRHS-1) {
verbOut << ", ";
}
}
verbOut << endl;
}
//
// Solve using Belos
//
verbOut << endl << "Setting up Belos" << endl;
const int NumGlobalElements = B->GlobalLength();
// Set up Belos solver parameters.
RCP<ParameterList> belosList = parameterList ("MINRES");
belosList->set ("Maximum Iterations", maxIters);
belosList->set ("Convergence Tolerance", tol);
if (verbose) {
belosList->set ("Verbosity", Belos::Errors + Belos::Warnings +
Belos::IterationDetails + Belos::OrthoDetails +
Belos::FinalSummary + Belos::TimingDetails + Belos::Debug);
belosList->set ("Output Frequency", frequency);
}
else {
belosList->set ("Verbosity", Belos::Errors + Belos::Warnings);
}
belosList->set ("Output Stream", rcpFromRef (verbOut));
// Construct an unpreconditioned linear problem instance.
typedef Belos::LinearProblem<double,MV,OP> prob_type;
RCP<prob_type> problem = rcp (new prob_type (A, X, B));
if (! problem->setProblem()) {
verbOut << endl << "ERROR: Failed to set up Belos::LinearProblem!" << endl;
return EXIT_FAILURE;
}
// Create an iterative solver manager.
Belos::SolverFactory<double, MV, OP> factory;
RCP<Belos::SolverManager<double,MV,OP> > newSolver =
factory.create ("MINRES", belosList);
newSolver->setProblem (problem);
// Print out information about problem. Make sure to use the
// information as stored in the Belos ParameterList, so that we know
// what the solver will do.
verbOut << endl
<< "Dimension of matrix: " << NumGlobalElements << endl
<< "Number of right-hand sides: " << numRHS << endl
<< "Max number of MINRES iterations: "
<< belosList->get<int> ("Maximum Iterations") << endl
<< "Relative residual tolerance: "
<< belosList->get<double> ("Convergence Tolerance") << endl
<< "Output frequency: "
<< belosList->get<int> ("Output Frequency") << endl
<< endl;
// Solve the linear system.
verbOut << "Solving the linear system" << endl << endl;
Belos::ReturnType ret = newSolver->solve();
verbOut << "Belos results:" << endl
<< "- Number of iterations: "
<< newSolver->getNumIters () << endl
<< "- " << (ret == Belos::Converged ? "Converged" : "Not converged")
<< endl;
//
// After the solve, compute residual(s) explicitly. This tests
// whether the Belos solver did so correctly.
//
std::vector<double> absoluteResidualNorms (numRHS);
OPT::Apply (*A, *X, R);
MVT::MvAddMv (-1.0, R, 1.0, *B, R);
MVT::MvNorm (R, absoluteResidualNorms);
std::vector<double> relativeResidualNorms (numRHS);
for (int i = 0; i < numRHS; ++i) {
relativeResidualNorms[i] = (initialResidualNorms[i] == 0.0) ?
absoluteResidualNorms[i] :
absoluteResidualNorms[i] / initialResidualNorms[i];
}
verbOut << "---------- Computed relative residual norms ----------"
<< endl << endl;
bool badRes = false;
if (verbose) {
for (int i = 0; i < numRHS; ++i) {
const double actRes = relativeResidualNorms[i];
verbOut << "Problem " << i << " : \t" << actRes << endl;
if (actRes > tol) {
badRes = true;
}
}
}
# ifdef BELOS_TEUCHOS_TIME_MONITOR
Teuchos::TimeMonitor::summarize (verbOut);
# endif // BELOS_TEUCHOS_TIME_MONITOR
success = (ret == Belos::Converged && !badRes);
if (success) {
verbOut << endl << "End Result: TEST PASSED" << endl;
} else {
verbOut << endl << "End Result: TEST FAILED" << endl;
}
} // try
TEUCHOS_STANDARD_CATCH_STATEMENTS(verbose, std::cerr, success);
return success ? EXIT_SUCCESS : EXIT_FAILURE;
} // end test_minres_hb.cpp
int main(int argc, char* argv[])
{
bool success = false;
bool verbose = false;
try
{
//
// Open an output file stream for writing our XML file
//
std::ofstream out;
//
// We will print to the 'out' ofstream, and that output will be
// valid XML describing the validated ParameterList. For the
// purposes of generating nicely-formatted HTML documentation for
// this ParameterList, we also need to include an XSL header line.
// This bool will control whether we include this header line,
// which can be controlled at the command line.
//
bool xsl_header_flag = true;
//
// Set up the command line processor. All versions of this
// executable should support the add-xsl-header /
// suppress-xsl-header command line options. If you want a single
// executable to support multiple ParameterLists, you could put
// additional options here to control which ParameterList to
// output.
//
CommandLineProcessor clp(false); //don't throw exceptions
clp.recogniseAllOptions(true);
clp.setOption("add-xsl-header",
"suppress-xsl-header",
&xsl_header_flag,
"XSL header flag");
//
// Parse the command line and quit if not successful
//
CommandLineProcessor::EParseCommandLineReturn parse_return =
clp.parse(argc, argv);
if(parse_return != CommandLineProcessor::PARSE_SUCCESSFUL)
return parse_return;
//
// Here is where code should go that is required to generate the
// validated XML file. If your class uses a construct-then-init
// idiom, then this is where the default constructor would be
// called. If this executable supports ParameterLists for more
// than one class, then this is where the logic to pick the
// appropriate class would go.
//
Belos::SolverFactory<scalar_type, multivector_type, operator_type> sFactory;
RCP<solver_type> solver;
for ( int i = 0; i < 4; ++i )
{
RCP<ParameterList> nullParams = parameterList();
std::cout << "writing parameter list " << i+1 << " of 9." << std::endl;
if ( i == 0 )
{
solver = sFactory.create("Block GMRES", nullParams);
out.open("belos_BlockGmres.xml", std::ofstream::out);
if ( xsl_header_flag )
writeXSLHeader( out );
RCP<const ParameterList> gmresParams = solver -> getValidParameters();
Teuchos::writeParameterListToXmlOStream( *gmresParams, out);
out.close();
}
else if ( i == 1 )
{
solver = sFactory.create("Pseudo Block GMRES", nullParams);
out.open("belos_PseudoBlockGmres.xml", std::ofstream::out);
if ( xsl_header_flag )
writeXSLHeader( out );
RCP<const ParameterList> pseudoGmresParams = solver -> getValidParameters();
Teuchos::writeParameterListToXmlOStream( *pseudoGmresParams, out);
out.close();
}
else if ( i == 2 )
{
solver = sFactory.create("Block CG", nullParams);
out.open("belos_BlockCG.xml", std::ofstream::out);
if ( xsl_header_flag )
writeXSLHeader( out );
RCP<const ParameterList> blockCgParams = solver -> getValidParameters();
Teuchos::writeParameterListToXmlOStream( *blockCgParams, out);
out.close();
}
else if ( i == 3 )
{
solver = sFactory.create("Pseudo Block CG", nullParams);
out.open("belos_PseudoBlockCG.xml", std::ofstream::out);
if ( xsl_header_flag )
writeXSLHeader( out );
RCP<const ParameterList> pseudoBlockCgParams = solver -> getValidParameters();
Teuchos::writeParameterListToXmlOStream( *pseudoBlockCgParams, out);
out.close();
}
}
success = true;
}
TEUCHOS_STANDARD_CATCH_STATEMENTS(verbose, std::cerr, success);
return ( success ? EXIT_SUCCESS : EXIT_FAILURE );
}
void solve_system_hierarchy(Xpetra::UnderlyingLib & lib, RCP<Matrix> & A, RCP<Vector>& X, RCP<Vector> & B, RCP<Hierarchy> & H, RCP<Teuchos::ParameterList> & SList) {
using Teuchos::RCP;
using Teuchos::rcp;
#ifdef HAVE_MUELU_BELOS
#ifdef HAVE_MUELU_TPETRA
typedef Tpetra::Operator<SC,LO,GO> Tpetra_Operator;
typedef Tpetra::CrsMatrix<SC,LO,GO> Tpetra_CrsMatrix;
typedef Tpetra::Vector<SC,LO,GO> Tpetra_Vector;
typedef Tpetra::MultiVector<SC,LO,GO> Tpetra_MultiVector;
if(lib==Xpetra::UseTpetra) {
RCP<Tpetra_CrsMatrix> At = Xpetra::Helpers<SC,LO,GO>::Op2NonConstTpetraCrs(A);
RCP<Tpetra_Operator> Mt = rcp(new MueLu::TpetraOperator<SC,LO,GO>(H));
RCP<Tpetra_MultiVector> Xt = Xpetra::toTpetra(*X);
RCP<Tpetra_MultiVector> Bt = Xpetra::toTpetra(*B);
typedef Tpetra_MultiVector MV;
typedef Tpetra_Operator OP;
RCP<Belos::LinearProblem<SC,MV,OP> > belosProblem = rcp(new Belos::LinearProblem<SC,MV,OP>(At, Xt, Bt));
belosProblem->setRightPrec(Mt);
belosProblem->setProblem(Xt,Bt);
Belos::SolverFactory<SC, MV, OP> BelosFactory;
Teuchos::RCP<Belos::SolverManager<SC, MV, OP> > BelosSolver = BelosFactory.create(std::string("CG"), SList);
BelosSolver->setProblem(belosProblem);
Belos::ReturnType result = BelosSolver->solve();
if(result==Belos::Unconverged)
throw std::runtime_error("Belos failed to converge");
}
#endif
#if defined(HAVE_MUELU_EPETRA) and defined(HAVE_MUELU_SERIAL)
if(lib==Xpetra::UseEpetra) {
RCP<Epetra_CrsMatrix> Ae;
// Get the underlying Epetra Mtx
try {
RCP<const Xpetra::CrsMatrixWrap<SC, LO, GO, Node> > crsOp = Teuchos::rcp_dynamic_cast<const Xpetra::CrsMatrixWrap<SC, LO, GO, Node> >(A);
RCP<const Xpetra::CrsMatrix<SC, LO, GO, Node> > tmp_CrsMtx = crsOp->getCrsMatrix();
const RCP<const Xpetra::EpetraCrsMatrixT<GO,Node> > &tmp_ECrsMtx = Teuchos::rcp_dynamic_cast<const Xpetra::EpetraCrsMatrixT<GO,Node> >(tmp_CrsMtx);
if (tmp_ECrsMtx == Teuchos::null)
throw(Xpetra::Exceptions::BadCast("Cast from Xpetra::CrsMatrix to Xpetra::EpetraCrsMatrix failed"));
const RCP<const Xpetra::EpetraCrsMatrixT<GO,Kokkos::Compat::KokkosSerialWrapperNode> > &tmp_ECrsMtxSer = Teuchos::rcp_dynamic_cast<const Xpetra::EpetraCrsMatrixT<GO,Kokkos::Compat::KokkosSerialWrapperNode> >(tmp_ECrsMtx);
if (tmp_ECrsMtxSer == Teuchos::null)
throw(Xpetra::Exceptions::BadCast("Cast from Xpetra::EpetraCrsMatrix<...,Node> to Xpetra::EpetraCrsMatrix<...,Kokkos::Compat::KokkosSerialWrapperNode> failed"));
//RCP<const Epetra_CrsMatrix> constEpMat = tmp_ECrsMtxSer->getEpetra_CrsMatrix();
//Ae = Teuchos::rcp_const_cast<Epetra_CrsMatrix>(constEpMat);
Ae = Teuchos::rcp_const_cast<Epetra_CrsMatrix>(tmp_ECrsMtxSer->getEpetra_CrsMatrix());
} catch(...) {
throw(Xpetra::Exceptions::BadCast("Cast from Xpetra::Matrix to Xpetra::CrsMatrixWrap failed"));
}
RCP<MueLu::Hierarchy<SC,LO,GO,Kokkos::Compat::KokkosSerialWrapperNode> > epH = Teuchos::rcp_dynamic_cast<MueLu::Hierarchy<SC,LO,GO,Kokkos::Compat::KokkosSerialWrapperNode> >(H);
if (epH == Teuchos::null)
throw(Xpetra::Exceptions::BadCast("Cast from MueLu::Hierarchy<...,Node> to MueLu::Hierarchy<...,Kokkos::Compat::KokkosSerialWrapperNode> failed"));
RCP<MueLu::EpetraOperator> Me = rcp(new MueLu::EpetraOperator(epH));
RCP<Epetra_MultiVector> Xe = rcp(&Xpetra::toEpetra<GO,Node>(*X),false);
RCP<Epetra_MultiVector> Be = rcp(&Xpetra::toEpetra<GO,Node>(*B),false);
typedef Epetra_MultiVector MV;
typedef Epetra_Operator OP;
RCP<Belos::LinearProblem<SC,MV,OP> > belosProblem = rcp(new Belos::LinearProblem<SC,MV,OP>(Ae, Xe, Be));
Teuchos::RCP<Belos::EpetraPrecOp> PrecWrap = Teuchos::rcp(new Belos::EpetraPrecOp(Me));
belosProblem->setRightPrec(PrecWrap);
belosProblem->setProblem(Xe,Be);
Belos::SolverFactory<SC, MV, OP> BelosFactory;
Teuchos::RCP<Belos::SolverManager<SC, MV, OP> > BelosSolver = BelosFactory.create(std::string("CG"), SList);
BelosSolver->setProblem(belosProblem);
Belos::ReturnType result = BelosSolver->solve();
if(result==Belos::Unconverged)
throw std::runtime_error("Belos failed to converge");
}
#endif
#endif // #ifdef HAVE_MUELU_BELOS
}