MueLu_DirectSolver_def.hpp

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#ifndef MUELU_DIRECTSOLVER_DEF_HPP
#define MUELU_DIRECTSOLVER_DEF_HPP

#include <Xpetra_Utils.hpp>
#include <Xpetra_Matrix.hpp>

#include "MueLu_DirectSolver_decl.hpp"

#include "MueLu_Exceptions.hpp"
#include "MueLu_Level.hpp"

#include "MueLu_Amesos2Smoother.hpp"
#include "MueLu_AmesosSmoother.hpp"
#include "MueLu_BelosSmoother.hpp"
#include "MueLu_StratimikosSmoother.hpp"

namespace MueLu {

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  DirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DirectSolver(const std::string& type, const Teuchos::ParameterList& paramListIn)
    : type_(type) {
    // The original idea behind all smoothers was to use prototype pattern. However, it does not fully work of the dependencies
    // calculation. Particularly, we need to propagate DeclareInput to proper prototypes. Therefore, both TrilinosSmoother and
    // DirectSolver do not follow the pattern exactly.
    // The difference is that in order to propagate the calculation of dependencies, we need to call a DeclareInput on a
    // constructed object (or objects, as we have two different code branches for Epetra and Tpetra). The only place where we
    // could construct these objects is the constructor. Thus, we need to store RCPs, and both TrilinosSmoother and DirectSolver
    // obtain a state: they contain RCP to smoother prototypes.
    sEpetra_ = Teuchos::null;
    sTpetra_ = Teuchos::null;
    sBelos_ = Teuchos::null;

    ParameterList paramList = paramListIn;

    // We want DirectSolver to be able to work with both Epetra and Tpetra objects, therefore we try to construct both
    // Amesos and Amesos2 solver prototypes. The construction really depends on configuration options.
    triedEpetra_ = triedTpetra_ = false;
#if defined(HAVE_MUELU_TPETRA) && defined(HAVE_MUELU_AMESOS2)
    try {
      sTpetra_ = rcp(new Amesos2Smoother(type_, paramList));
      if (sTpetra_.is_null())
        errorTpetra_ = "Unable to construct Amesos2 direct solver";
      else if (!sTpetra_->constructionSuccessful()) {
        errorTpetra_ = sTpetra_->constructionErrorMsg();
        sTpetra_ = Teuchos::null;
      }
    } catch (Exceptions::RuntimeError& e) {
      errorTpetra_ = e.what();
    } catch (Exceptions::BadCast& e) {
      errorTpetra_ = e.what();
    } catch (Teuchos::Exceptions::InvalidParameterName& e) {
      errorTpetra_ = e.what();
    }
    triedTpetra_ = true;
#endif
#if defined(HAVE_MUELU_EPETRA) && defined(HAVE_MUELU_AMESOS)
    try {
      // GetAmesosSmoother masks the template argument matching, and simply throws if template arguments are incompatible with Epetra
      sEpetra_ = GetAmesosSmoother<SC,LO,GO,NO>(type_, paramList);
      if (sEpetra_.is_null())
        errorEpetra_ = "Unable to construct Amesos direct solver";
      else if (!sEpetra_->constructionSuccessful()) {
        errorEpetra_ = sEpetra_->constructionErrorMsg();
        sEpetra_ = Teuchos::null;
      }
    } catch (Exceptions::RuntimeError& e) {
      // AmesosSmoother throws if Scalar != double, LocalOrdinal != int, GlobalOrdinal != int
      errorEpetra_ = e.what();
    }
    triedEpetra_ = true;
#endif
#if defined(HAVE_MUELU_BELOS)
    try {
      sBelos_ = rcp(new BelosSmoother(type_, paramList));
      if (sBelos_.is_null())
        errorBelos_ = "Unable to construct Belos solver";
      else if (!sBelos_->constructionSuccessful()) {
        errorBelos_ = sBelos_->constructionErrorMsg();
        sBelos_ = Teuchos::null;
      }
    } catch (Exceptions::RuntimeError& e) {
      errorBelos_ = e.what();
    } catch (Exceptions::BadCast& e) {
      errorBelos_ = e.what();
    }
    triedBelos_ = true;
#endif
#if defined(HAVE_MUELU_STRATIMIKOS) && defined(HAVE_MUELU_TPETRA) && defined(HAVE_MUELU_THYRA)
    try {
      sStratimikos_ = rcp(new StratimikosSmoother(type_, paramList));
      if (sStratimikos_.is_null())
        errorStratimikos_ = "Unable to construct Stratimikos smoother";
      else if (!sStratimikos_->constructionSuccessful()) {
        errorStratimikos_ = sStratimikos_->constructionErrorMsg();
        sStratimikos_ = Teuchos::null;
      }
    } catch (Exceptions::RuntimeError& e){
      errorStratimikos_ = e.what();
    }
    triedStratimikos_ = true;
#endif

    // Check if we were able to construct at least one solver. In many cases that's all we need, for instance if a user
    // simply wants to use Tpetra only stack, never enables Amesos, and always runs Tpetra objects.
    TEUCHOS_TEST_FOR_EXCEPTION(!triedEpetra_ && !triedTpetra_ && !triedBelos_ && !triedStratimikos_, Exceptions::RuntimeError, "Unable to construct any direct solver."
                               "Plase enable (TPETRA and AMESOS2) or (EPETRA and AMESOS) or (BELOS) or (STRATIMIKOS)");

    TEUCHOS_TEST_FOR_EXCEPTION(sEpetra_.is_null() && sTpetra_.is_null() && sBelos_.is_null() && sStratimikos_.is_null(), Exceptions::RuntimeError,
        "Could not enable any direct solver:\n"
        << (triedEpetra_ ? "Epetra mode was disabled due to an error:\n" : "")
        << (triedEpetra_ ? errorEpetra_ : "")
        << (triedTpetra_ ? "Tpetra mode was disabled due to an error:\n" : "")
        << (triedTpetra_ ? errorTpetra_ : "")
        << (triedBelos_ ? "Belos was disabled due to an error:\n" : "")
        << (triedBelos_ ? errorBelos_ : "")
        << (triedStratimikos_ ? "Stratimikos was disabled due to an error:\n" : "")
        << (triedStratimikos_ ? errorStratimikos_ : ""));

    this->SetParameterList(paramList);
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void DirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::SetFactory(const std::string& varName, const RCP<const FactoryBase>& factory) {
    // We need to propagate SetFactory to proper place
    if (!sEpetra_.is_null()) sEpetra_->SetFactory(varName, factory);
    if (!sTpetra_.is_null()) sTpetra_->SetFactory(varName, factory);
    if (!sBelos_.is_null())  sBelos_->SetFactory(varName, factory);
    if (!sStratimikos_.is_null()) sStratimikos_->SetFactory(varName, factory);
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void DirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DeclareInput(Level& currentLevel) const {
    if (!sBelos_.is_null())
      s_ = sBelos_;
    else if (!sStratimikos_.is_null())
      s_ = sStratimikos_;
    else {
      // Decide whether we are running in Epetra or Tpetra mode
      //
      // Theoretically, we could make this decision in the constructor, and create only
      // one of the smoothers. But we want to be able to reuse, so one can imagine a scenario
      // where one first runs hierarchy with tpetra matrix, and then with epetra.
      bool useTpetra = (currentLevel.lib() == Xpetra::UseTpetra);
      s_ = (useTpetra ? sTpetra_ : sEpetra_);
      if (s_.is_null()) {
        if (useTpetra) {
#if not defined(HAVE_MUELU_AMESOS2)
          TEUCHOS_TEST_FOR_EXCEPTION(true, Exceptions::RuntimeError,
                                     "Error: running in Tpetra mode, but MueLu with Amesos2 was disabled during the configure stage.\n"
                                     "Please make sure that:\n"
                                     "  - Amesos2 is enabled (Trilinos_ENABLE_Amesos2=ON),\n"
                                     "  - Amesos2 is available for MueLu to use (MueLu_ENABLE_Amesos2=ON)\n");
#else
          if (triedTpetra_)
            this->GetOStream(Errors) << "Tpetra mode was disabled due to an error:\n" << errorTpetra_ << std::endl;
#endif
        }
        if (!useTpetra) {
#if not defined(HAVE_MUELU_AMESOS)
          TEUCHOS_TEST_FOR_EXCEPTION(true, Exceptions::RuntimeError,
                                     "Error: running in Epetra mode, but MueLu with Amesos was disabled during the configure stage.\n"
                                     "Please make sure that:\n"
                                     "  - Amesos is enabled (you can do that with Trilinos_ENABLE_Amesos=ON),\n"
                                     "  - Amesos is available for MueLu to use (MueLu_ENABLE_Amesos=ON)\n");
#else
          if (triedEpetra_)
            this->GetOStream(Errors) << "Epetra mode was disabled due to an error:\n" << errorEpetra_ << std::endl;
#endif
        }
        TEUCHOS_TEST_FOR_EXCEPTION(true, Exceptions::RuntimeError,
                                   "Direct solver for " << (useTpetra ? "Tpetra" : "Epetra") << " was not constructed");
      }
    }

    s_->DeclareInput(currentLevel);
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void DirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Setup(Level& currentLevel) {
    if (SmootherPrototype::IsSetup() == true)
      this->GetOStream(Warnings0) << "MueLu::DirectSolver::Setup(): Setup() has already been called" << std::endl;

    int oldRank = s_->SetProcRankVerbose(this->GetProcRankVerbose());

    s_->Setup(currentLevel);

    s_->SetProcRankVerbose(oldRank);

    SmootherPrototype::IsSetup(true);

    this->SetParameterList(s_->GetParameterList());
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void DirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Apply(MultiVector& X, const MultiVector& B, bool InitialGuessIsZero) const {
    TEUCHOS_TEST_FOR_EXCEPTION(SmootherPrototype::IsSetup() == false, Exceptions::RuntimeError, "MueLu::AmesosSmoother::Apply(): Setup() has not been called");

    s_->Apply(X, B, InitialGuessIsZero);
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  RCP<MueLu::SmootherPrototype<Scalar, LocalOrdinal, GlobalOrdinal, Node> > DirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Copy() const {
    RCP<DirectSolver> newSmoo =  rcp(new DirectSolver(*this));

    // We need to be quite careful with Copy
    // We still want DirectSolver to follow Prototype Pattern, so we need to hide the fact that we do have some state
    if (!sEpetra_.is_null())
      newSmoo->sEpetra_ = sEpetra_->Copy();
    if (!sTpetra_.is_null())
      newSmoo->sTpetra_ = sTpetra_->Copy();
    if (!sBelos_.is_null())
      newSmoo->sBelos_ = sBelos_->Copy();
    if (!sStratimikos_.is_null())
      newSmoo->sStratimikos_ = sStratimikos_->Copy();

    // Copy the default mode
    if (s_.get() == sBelos_.get())
      newSmoo->s_ = newSmoo->sBelos_;
    else if (s_.get() == sStratimikos_.get())
      newSmoo->s_ = newSmoo->sStratimikos_;
    else if (s_.get() == sTpetra_.get())
      newSmoo->s_ = newSmoo->sTpetra_;
    else
      newSmoo->s_ = newSmoo->sEpetra_;
    newSmoo->SetParameterList(this->GetParameterList());

    return newSmoo;
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  std::string DirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::description() const {
    std::ostringstream out;
    if (s_ != Teuchos::null) {
      out << s_->description();
    } else {
      out << SmootherPrototype::description();
      out << "{type = " << type_ << "}";
    }
    return out.str();
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void DirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::print(Teuchos::FancyOStream& out, const VerbLevel verbLevel) const {
    MUELU_DESCRIBE;

    if (verbLevel & Parameters0)
      out0 << "Prec. type: " << type_ << std::endl;

    if (verbLevel & Parameters1) {
      out0 << "Parameter list: " << std::endl;
      Teuchos::OSTab tab3(out);
      out << this->GetParameterList();
    }

    if (verbLevel & Debug)
      out0 << "IsSetup: " << Teuchos::toString(SmootherPrototype::IsSetup()) << std::endl;
  }

} // namespace MueLu

#endif // MUELU_DIRECTSOLVER_DEF_HPP