PlayaIfpackICCOperator.cpp

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/* @HEADER@ */
//   
/* @HEADER@ */

#include "PlayaIfpackICCOperator.hpp"
#include "Teuchos_Array.hpp"
#include "PlayaMPIComm.hpp"
#include "PlayaEpetraVector.hpp"


#ifndef HAVE_TEUCHOS_EXPLICIT_INSTANTIATION
#include "PlayaVectorImpl.hpp"
#include "PlayaLinearOperatorImpl.hpp"
#endif

namespace Playa
{

using namespace Teuchos;

IfpackICCOperator::IfpackICCOperator(const EpetraMatrix* A,
  int fillLevels,
  int overlapFill,
  double relaxationValue,
  double relativeThreshold,
  double absoluteThreshold)
  : LinearOpWithSpaces<double>(A->domain(), A->range()),
    precond_()
{
  const Epetra_CrsMatrix* matrix = A->crsMatrix();

  Ifpack_ICT* precond = new Ifpack_ICT(matrix);
  precond_ = rcp(precond);

  Teuchos::ParameterList List;
  
  List.set("fact: ict level-of-fill", fillLevels);
  List.set("fact: absolute threshold", absoluteThreshold);
  List.set("fact: relative threshold", relativeThreshold);
  List.set("fact: relax value", relaxationValue);
  List.set("fact: drop tolerance", 1.0E-4);

  //ierr = precond->InitValues(*matrix);


  int ierr = precond->Compute();

  TEUCHOS_TEST_FOR_EXCEPTION(ierr < 0, std::runtime_error,
    "IfpackOperator ctor: "
    "precond->Factor() failed with ierr="
    << ierr);
}

void IfpackICCOperator::apply(Teuchos::ETransp transApplyType,
  const Vector<double>& in,
  Vector<double> out) const
{
  /* grab the epetra vector objects underlying the input and output vectors */
  const Epetra_Vector& epIn = EpetraVector::getConcrete(in);
  Epetra_Vector& epOut = EpetraVector::getConcrete(out);

  /* ifpack's solve is logically const but declared non-const because
   *  internal data changes. So, do a const_cast. */
  Ifpack_ICT* p = const_cast<Ifpack_ICT*>(precond_.get());

  int ierr;

  /* do the solve (or transpose solve) */
  if (transApplyType==NO_TRANS)
  {
    ierr = p->H().Solve(false,false,false, epIn, epOut);
  }
  else
  {
    ierr = p->H().Solve(false,true,false, epIn, epOut);
  }
}
  
  void IfpackICCOperator::print(std::ostream& os) const 
{
  precond_->Print(os);
}

string IfpackICCOperator::description() const 
{
  std::string rtn = "ICC Preconditioner";
  return rtn;
}

}