MueLu_SaPFactory_kokkos_def.hpp

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#ifndef MUELU_SAPFACTORY_KOKKOS_DEF_HPP
#define MUELU_SAPFACTORY_KOKKOS_DEF_HPP

#ifdef HAVE_MUELU_KOKKOS_REFACTOR

#include "MueLu_SaPFactory_kokkos_decl.hpp"

#include <Xpetra_Matrix.hpp>
#include <Xpetra_IteratorOps.hpp>

#include "MueLu_FactoryManagerBase.hpp"
#include "MueLu_Level.hpp"
#include "MueLu_MasterList.hpp"
#include "MueLu_Monitor.hpp"
#include "MueLu_PerfUtils.hpp"
#include "MueLu_SingleLevelFactoryBase.hpp"
#include "MueLu_TentativePFactory.hpp"
#include "MueLu_Utilities_kokkos.hpp"

#include <sstream>

namespace MueLu {

  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class DeviceType>
  RCP<const ParameterList> SaPFactory_kokkos<Scalar,LocalOrdinal,GlobalOrdinal,Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>>::GetValidParameterList() const {
    RCP<ParameterList> validParamList = rcp(new ParameterList());

#define SET_VALID_ENTRY(name) validParamList->setEntry(name, MasterList::getEntry(name))
    SET_VALID_ENTRY("sa: damping factor");
    SET_VALID_ENTRY("sa: calculate eigenvalue estimate");
    SET_VALID_ENTRY("sa: eigenvalue estimate num iterations");
#undef  SET_VALID_ENTRY

    validParamList->set< RCP<const FactoryBase> >("A", Teuchos::null, "Generating factory of the matrix A used during the prolongator smoothing process");
    validParamList->set< RCP<const FactoryBase> >("P", Teuchos::null, "Tentative prolongator factory");

    // Make sure we don't recursively validate options for the matrixmatrix kernels
    ParameterList norecurse;
    norecurse.disableRecursiveValidation();
    validParamList->set<ParameterList> ("matrixmatrix: kernel params", norecurse, "MatrixMatrix kernel parameters");


    return validParamList;
  }

  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class DeviceType>
  void SaPFactory_kokkos<Scalar,LocalOrdinal,GlobalOrdinal,Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>>::DeclareInput(Level& fineLevel, Level& coarseLevel) const {
    Input(fineLevel, "A");

    // Get default tentative prolongator factory
    // Getting it that way ensure that the same factory instance will be used for both SaPFactory_kokkos and NullspaceFactory.
    RCP<const FactoryBase> initialPFact = GetFactory("P");
    if (initialPFact == Teuchos::null) { initialPFact = coarseLevel.GetFactoryManager()->GetFactory("Ptent"); }
    coarseLevel.DeclareInput("P", initialPFact.get(), this);
  }

  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class DeviceType>
  void SaPFactory_kokkos<Scalar,LocalOrdinal,GlobalOrdinal,Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>>::Build(Level& fineLevel, Level& coarseLevel) const {
    return BuildP(fineLevel, coarseLevel);
  }

  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class DeviceType>
  void SaPFactory_kokkos<Scalar,LocalOrdinal,GlobalOrdinal,Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>>::BuildP(Level& fineLevel, Level& coarseLevel) const {
    FactoryMonitor m(*this, "Prolongator smoothing", coarseLevel);

    // Add debugging information
    DeviceType::execution_space::print_configuration(GetOStream(Runtime1));

    typedef typename Teuchos::ScalarTraits<SC>::magnitudeType Magnitude;

    // Get default tentative prolongator factory
    // Getting it that way ensure that the same factory instance will be used for both SaPFactory_kokkos and NullspaceFactory.
    // -- Warning: Do not use directly initialPFact_. Use initialPFact instead everywhere!
    RCP<const FactoryBase> initialPFact = GetFactory("P");
    if (initialPFact == Teuchos::null) { initialPFact = coarseLevel.GetFactoryManager()->GetFactory("Ptent"); }
    const ParameterList& pL = GetParameterList();

    // Level Get
    RCP<Matrix> A     = Get< RCP<Matrix> >(fineLevel, "A");
    RCP<Matrix> Ptent = coarseLevel.Get< RCP<Matrix> >("P", initialPFact.get());

    if(restrictionMode_) {
      SubFactoryMonitor m2(*this, "Transpose A", coarseLevel);

      A = Utilities_kokkos::Transpose(*A, true); // build transpose of A explicitly
    }

    //Build final prolongator
    RCP<Matrix> finalP; // output

    // Reuse pattern if available
    RCP<ParameterList> APparams;
    if(pL.isSublist("matrixmatrix: kernel params")) 
      APparams=rcp(new ParameterList(pL.sublist("matrixmatrix: kernel params")));
    else 
      APparams= rcp(new ParameterList);
    if (coarseLevel.IsAvailable("AP reuse data", this)) {
      GetOStream(static_cast<MsgType>(Runtime0 | Test)) << "Reusing previous AP data" << std::endl;

      APparams = coarseLevel.Get< RCP<ParameterList> >("AP reuse data", this);

      if (APparams->isParameter("graph"))
        finalP = APparams->get< RCP<Matrix> >("graph");
    }
    // By default, we don't need global constants for SaP
    APparams->set("compute global constants: temporaries",APparams->get("compute global constants: temporaries",false));
    APparams->set("compute global constants",APparams->get("compute global constants",false));

    SC dampingFactor      = as<SC>(pL.get<double>("sa: damping factor"));
    LO maxEigenIterations = as<LO>(pL.get<int>("sa: eigenvalue estimate num iterations"));
    bool estimateMaxEigen = pL.get<bool>("sa: calculate eigenvalue estimate");
    if (dampingFactor != Teuchos::ScalarTraits<SC>::zero()) {

      SC lambdaMax;
      {
        SubFactoryMonitor m2(*this, "Eigenvalue estimate", coarseLevel);
        lambdaMax = A->GetMaxEigenvalueEstimate();
        if (lambdaMax == -Teuchos::ScalarTraits<SC>::one() || estimateMaxEigen) {
          GetOStream(Statistics1) << "Calculating max eigenvalue estimate now (max iters = "<< maxEigenIterations << ")" << std::endl;
          Magnitude stopTol = 1e-4;
          lambdaMax = Utilities_kokkos::PowerMethod(*A, true, maxEigenIterations, stopTol);
          A->SetMaxEigenvalueEstimate(lambdaMax);
        } else {
          GetOStream(Statistics1) << "Using cached max eigenvalue estimate" << std::endl;
        }
        GetOStream(Statistics0) << "Prolongator damping factor = " << dampingFactor/lambdaMax << " (" << dampingFactor << " / " << lambdaMax << ")" << std::endl;
      }

      {
        SubFactoryMonitor m2(*this, "Fused (I-omega*D^{-1} A)*Ptent", coarseLevel);
        RCP<Vector> invDiag = Utilities_kokkos::GetMatrixDiagonalInverse(*A);

        SC omega = dampingFactor / lambdaMax;
        TEUCHOS_TEST_FOR_EXCEPTION(!std::isfinite(Teuchos::ScalarTraits<SC>::magnitude(omega)), Exceptions::RuntimeError, "Prolongator damping factor needs to be finite.");

        // finalP = Ptent + (I - \omega D^{-1}A) Ptent
        finalP = Xpetra::IteratorOps<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Jacobi(omega, *invDiag, *A, *Ptent, finalP, GetOStream(Statistics2), std::string("MueLu::SaP-") + toString(coarseLevel.GetLevelID()), APparams);
      }

    } else {
      finalP = Ptent;
    }

    // Level Set
    if (!restrictionMode_) {
      // prolongation factory is in prolongation mode
      if(!finalP.is_null()) {std::ostringstream oss; oss << "P_" << coarseLevel.GetLevelID(); finalP->setObjectLabel(oss.str());}
      Set(coarseLevel, "P", finalP);

      // NOTE: EXPERIMENTAL
      if (Ptent->IsView("stridedMaps"))
        finalP->CreateView("stridedMaps", Ptent);

    } else {
      // prolongation factory is in restriction mode
      RCP<Matrix> R = Utilities_kokkos::Transpose(*finalP, true);
      Set(coarseLevel, "R", R);
      if(!R.is_null()) {std::ostringstream oss; oss << "R_" << coarseLevel.GetLevelID(); R->setObjectLabel(oss.str());}

      // NOTE: EXPERIMENTAL
      if (Ptent->IsView("stridedMaps"))
        R->CreateView("stridedMaps", Ptent, true);
    }

    if (IsPrint(Statistics2)) {
      RCP<ParameterList> params = rcp(new ParameterList());
      params->set("printLoadBalancingInfo", true);
      params->set("printCommInfo",          true);
      GetOStream(Statistics2) << PerfUtils::PrintMatrixInfo(*finalP, (!restrictionMode_ ? "P" : "R"), params);
    }

  } //Build()

} //namespace MueLu

#endif // HAVE_MUELU_KOKKOS_REFACTOR
#endif // MUELU_SAPFACTORY_KOKKOS_DEF_HPP

//TODO: restrictionMode_ should use the parameter list.