void ReuseXpetraPreconditioner(const Teuchos::RCP<Xpetra::Matrix<Scalar, LocalOrdinal, GlobalOrdinal, Node> >& A,
Teuchos::RCP<MueLu::Hierarchy<Scalar,LocalOrdinal,GlobalOrdinal,Node>>& H) {
std::string timerName = "MueLu setup time";
RCP<Teuchos::Time> tm = Teuchos::TimeMonitor::getNewTimer(timerName);
tm->start();
typedef Scalar SC;
typedef LocalOrdinal LO;
typedef GlobalOrdinal GO;
typedef Node NO;
typedef Xpetra::Matrix<SC,LO,GO,NO> Matrix;
typedef Xpetra::Operator<SC,LO,GO,NO> Operator;
TEUCHOS_TEST_FOR_EXCEPTION(!H->GetNumLevels(), Exceptions::RuntimeError,
"MueLu::ReuseXpetraPreconditioner: Hierarchy has no levels in it");
TEUCHOS_TEST_FOR_EXCEPTION(!H->GetLevel(0)->IsAvailable("A"), Exceptions::RuntimeError,
"MueLu::ReuseXpetraPreconditioner: Hierarchy has no fine level operator");
RCP<Level> level0 = H->GetLevel(0);
RCP<Operator> O0 = level0->Get<RCP<Operator> >("A");
RCP<Matrix> A0 = Teuchos::rcp_dynamic_cast<Matrix>(O0);
if (!A0.is_null()) {
// If a user provided a "number of equations" argument in a parameter list
// during the initial setup, we must honor that settings and reuse it for
// all consequent setups.
A->SetFixedBlockSize(A0->GetFixedBlockSize());
}
level0->Set("A", A);
H->SetupRe();
tm->stop();
tm->incrementNumCalls();
if (H->GetVerbLevel() & Statistics0) {
const bool alwaysWriteLocal = true;
const bool writeGlobalStats = true;
const bool writeZeroTimers = false;
const bool ignoreZeroTimers = true;
const std::string filter = timerName;
Teuchos::TimeMonitor::summarize(A->getRowMap()->getComm().ptr(), std::cout, alwaysWriteLocal, writeGlobalStats,
writeZeroTimers, Teuchos::Union, filter, ignoreZeroTimers);
}
tm->reset();
}
int main(int argc, char *argv[]) {
#include "MueLu_UseShortNames.hpp"
Teuchos::oblackholestream blackhole;
Teuchos::GlobalMPISession mpiSession(&argc,&argv,&blackhole);
bool success = true;
bool verbose = true;
try {
Teuchos::RCP<const Teuchos::Comm<int> > comm = Teuchos::DefaultComm<int>::getComm();
/**********************************************************************************/
/* SET TEST PARAMETERS */
/**********************************************************************************/
// Note: use --help to list available options.
Teuchos::CommandLineProcessor clp(false);
// Default is Laplace1D with nx = 8748.
// It's a nice size for 1D and perfect aggregation. (6561=3^8)
//Nice size for 1D and perfect aggregation on small numbers of processors. (8748=4*3^7)
Galeri::Xpetra::Parameters<GO> matrixParameters(clp, 8748); // manage parameters of the test case
Xpetra::Parameters xpetraParameters(clp); // manage parameters of xpetra
// custom parameters
int pauseForDebugger=0;
//std::string aggOrdering = "natural";
int minPerAgg=2; //was 3 in simple
int maxNbrAlreadySelected=0;
int printTimings=0;
std::string xmlFile="parameters.xml";
//clp.setOption("aggOrdering",&aggOrdering,"aggregation ordering strategy (natural,graph)");
clp.setOption("debug",&pauseForDebugger,"pause to attach debugger");
clp.setOption("maxNbrSel",&maxNbrAlreadySelected,"maximum # of nbrs allowed to be in other aggregates");
clp.setOption("minPerAgg",&minPerAgg,"minimum #DOFs per aggregate");
clp.setOption("timings",&printTimings,"print timings to screen");
clp.setOption("xmlFile",&xmlFile,"file name containing MueLu multigrid parameters in XML format");
switch (clp.parse(argc,argv)) {
case Teuchos::CommandLineProcessor::PARSE_HELP_PRINTED: return EXIT_SUCCESS; break;
case Teuchos::CommandLineProcessor::PARSE_ERROR:
case Teuchos::CommandLineProcessor::PARSE_UNRECOGNIZED_OPTION: return EXIT_FAILURE; break;
case Teuchos::CommandLineProcessor::PARSE_SUCCESSFUL: break;
}
Teuchos::RCP<Teuchos::TimeMonitor> globalTimeMonitor = Teuchos::rcp (new Teuchos::TimeMonitor(*Teuchos::TimeMonitor::getNewTimer("Timings: Global Time")));
if (pauseForDebugger) {
Utilities::PauseForDebugger();
}
matrixParameters.check();
xpetraParameters.check();
Xpetra::UnderlyingLib lib = xpetraParameters.GetLib();
if (comm->getRank() == 0) {
std::cout << xpetraParameters << matrixParameters;
}
/**********************************************************************************/
/* CREATE INITIAL MATRIX */
/**********************************************************************************/
Teuchos::RCP<const Map> map;
Teuchos::RCP<Matrix> A;
{
Teuchos::TimeMonitor tm(*Teuchos::TimeMonitor::getNewTimer("Timings: Matrix Build"));
map = MapFactory::Build(lib, matrixParameters.GetNumGlobalElements(), 0, comm);
Teuchos::RCP<Galeri::Xpetra::Problem<Map,CrsMatrixWrap,MultiVector> > Pr =
Galeri::Xpetra::BuildProblem<SC,LO,GO,Map,CrsMatrixWrap,MultiVector>(matrixParameters.GetMatrixType(), map, matrixParameters.GetParameterList()); //TODO: Matrix vs. CrsMatrixWrap
A = Pr->BuildMatrix();
}
/**********************************************************************************/
/* */
/**********************************************************************************/
Teuchos::ParameterList paramList;
Teuchos::updateParametersFromXmlFileAndBroadcast(xmlFile, Teuchos::Ptr<Teuchos::ParameterList>(¶mList), *comm);
// create parameter list interpreter
Teuchos::RCP<HierarchyManager> mueluFactory = Teuchos::rcp(new ParameterListInterpreter(paramList));
Teuchos::RCP<Hierarchy> H = mueluFactory->CreateHierarchy();
H->GetLevel(0)->Set< Teuchos::RCP<Matrix> >("A", A);
Teuchos::RCP<MultiVector> nullspace = MultiVectorFactory::Build(A->getRowMap(), 1);
nullspace->putScalar(1.0);
H->GetLevel(0)->Set("Nullspace", nullspace);
// set minimal information about number of layers for semicoarsening...
// This information can also be provided as a user parameter in the xml file using the
// parameter: "semicoarsen: num layers"
H->GetLevel(0)->Set("NumZLayers",matrixParameters.GetParameterList().get<GO>("nz"));
mueluFactory->SetupHierarchy(*H);
for (int l=0; l<H->GetNumLevels(); l++) {
Teuchos::RCP<MueLu::Level> level = H->GetLevel(l);
if(level->IsAvailable("A", MueLu::NoFactory::get()) == false) { success = false; H->GetLevel(l)->print(std::cout, MueLu::Debug);}
if(level->IsAvailable("P", MueLu::NoFactory::get()) == false && l>0) { success = false; H->GetLevel(l)->print(std::cout, MueLu::Debug);}
if(level->IsAvailable("R", MueLu::NoFactory::get()) == false && l>0) { success = false; H->GetLevel(l)->print(std::cout, MueLu::Debug);}
if(level->IsAvailable("PreSmoother", MueLu::NoFactory::get()) == false) { success = false; H->GetLevel(l)->print(std::cout, MueLu::Debug);}
if(level->IsAvailable("PostSmoother", MueLu::NoFactory::get()) == false && l<H->GetNumLevels()-1) { success = false; H->GetLevel(l)->print(std::cout, MueLu::Debug);}
if(level->IsAvailable("NumZLayers", MueLu::NoFactory::get()) == true && l>0) { success = false; H->GetLevel(l)->print(std::cout, MueLu::Debug);}
H->GetLevel(l)->print(std::cout, MueLu::Debug);
}
///////////////////////////////////////////////////////////
// =========================================================================
// System solution (Ax = b)
// =========================================================================
comm->barrier();
typedef Teuchos::ScalarTraits<SC> STS;
SC zero = STS::zero(), one = STS::one();
Teuchos::RCP<Vector> X = VectorFactory::Build(A->getRowMap());
Teuchos::RCP<Vector> B = VectorFactory::Build(A->getRowMap());
{
// we set seed for reproducibility
Utilities::SetRandomSeed(*comm);
X->randomize();
A->apply(*X, *B, Teuchos::NO_TRANS, one, zero);
Teuchos::Array<STS::magnitudeType> norms(1);
B->norm2(norms);
B->scale(one/norms[0]);
X->putScalar(zero);
}
comm->barrier();
H->IsPreconditioner(false);
H->Iterate(*B, *X, 20);
// Timer final summaries
globalTimeMonitor = Teuchos::null; // stop this timer before summary
if (printTimings)
Teuchos::TimeMonitor::summarize();
}
TEUCHOS_STANDARD_CATCH_STATEMENTS(verbose, std::cerr, success);
return ( success ? EXIT_SUCCESS : EXIT_FAILURE );
}
