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// ***********************************************************************
//
// Ifpack: Object-Oriented Algebraic Preconditioner Package
// Copyright (2002) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
//@HEADER
*/
#ifndef IFPACK_METISREORDERING_H
#define IFPACK_METISREORDERING_H
#include "Ifpack_ConfigDefs.h"
#include "Ifpack_Reordering.h"
#include "Epetra_RowMatrix.h"
#include "Teuchos_ParameterList.hpp"
#include "Teuchos_RefCountPtr.hpp"
class Epetra_Comm;
class Ifpack_Graph;
class Epetra_Map;
class Epetra_BlockMap;
class Epetra_Import;
//! Ifpack_METISReordering: A class to reorder a graph using METIS.
class Ifpack_METISReordering : public Ifpack_Reordering {
public:
//! Constructor.
Ifpack_METISReordering();
//! Destructor.
virtual ~Ifpack_METISReordering() {};
//! Sets integer parameters `Name'.
virtual int SetParameter(const string Name, const int Value)
{
if (Name == "partitioner: use symmetric graph")
UseSymmetricGraph_ = (bool)Value;
return(0);
}
//! Sets double parameters `Name'.
virtual int SetParameter(const string Name, const double Value)
{
return(0);
};
//! Sets all the parameters for the partitioner (none at moment).
virtual int SetParameters(Teuchos::ParameterList& List)
{
UseSymmetricGraph_ = List.get("partitioner: use symmetric graph",
UseSymmetricGraph_);
return(0);
}
//! Computes all it is necessary to initialize the reordering object.
virtual int Compute(const Ifpack_Graph& Graph);
//! Computes all it is necessary to initialize the reordering object.
virtual int Compute(const Epetra_RowMatrix& Matrix);
//! Returns \c true is the reordering object has been successfully initialized, false otherwise.
virtual bool IsComputed() const
{
return(IsComputed_);
}
//! Returns the reordered index of row \c i.
virtual int Reorder(const int i) const;
//! Returns the inverse reordered index of row \c i.
virtual int InvReorder(const int i) const;
//! Applies reordering to multivector Xorig, whose local length equals the number of local rows, stores result in X.
virtual int P(const Epetra_MultiVector& Xorig,
Epetra_MultiVector& X) const;
//! Applies inverse reordering to multivector Xorig, whose local length equals the number of local rows, stores result in X.
virtual int Pinv(const Epetra_MultiVector& Xorig,
Epetra_MultiVector& X) const;
//! Prints basic information on iostream. This function is used by operator<<.
virtual ostream& Print(std::ostream& os) const;
private:
//! If \c true, the graph has to be symmetrized before calling METIS.
bool UseSymmetricGraph_;
//! Number of local rows in the graph.
int NumMyRows_;
//! If \c true, the reordering has been successfully computed.
bool IsComputed_;
//! Contains the reordering.
std::vector<int> Reorder_;
//! Contains the inverse reordering.
std::vector<int> InvReorder_;
}; // class Ifpack_METISReordering
#endif // IFPACK_METISREORDERING_H
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