TrilinosPreconditioner.hpp

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/*
 * ------------------------------------------------------------------------------------------------------------
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (c) 2018-2020 Lawrence Livermore National Security LLC
 * Copyright (c) 2018-2020 The Board of Trustees of the Leland Stanford Junior University
 * Copyright (c) 2018-2020 TotalEnergies
 * Copyright (c) 2019-     GEOSX Contributors
 * All rights reserved
 *
 * See top level LICENSE, COPYRIGHT, CONTRIBUTORS, NOTICE, and ACKNOWLEDGEMENTS files for details.
 * ------------------------------------------------------------------------------------------------------------
 */
 
#ifndef GEOS_LINEARALGEBRA_INTERFACES_TRILINOSPRECONDITIONER_HPP_
#define GEOS_LINEARALGEBRA_INTERFACES_TRILINOSPRECONDITIONER_HPP_
 
#include "common/PreconditionerBase.hpp"
#include "linearAlgebra/interfaces/trilinos/TrilinosInterface.hpp"
#include "linearAlgebra/utilities/LinearSolverParameters.hpp"
 
#include <memory>
 
class Epetra_Operator;
 
namespace geos
{
 
class TrilinosPreconditioner final : public PreconditionerBase< TrilinosInterface >
{
public:
 
  using Base = PreconditionerBase< TrilinosInterface >;
 
  using Vector = typename Base::Vector;
 
  using Matrix = typename Base::Matrix;
 
  explicit TrilinosPreconditioner( LinearSolverParameters params );
 
  TrilinosPreconditioner( LinearSolverParameters params,
                          array1d< Vector > const & nearNullKernel );
 
  virtual ~TrilinosPreconditioner() override;
 
  virtual void setup( Matrix const & mat ) override;
 
  virtual void apply( Vector const & src, Vector & dst ) const override;
 
  virtual void clear() override;
 
  Epetra_Operator const & unwrapped() const;
 
  Epetra_Operator & unwrapped();
 
private:
 
  EpetraMatrix const & setupPreconditioningMatrix( EpetraMatrix const & mat );
 
  LinearSolverParameters m_params;
 
  EpetraMatrix m_precondMatrix;
 
  std::unique_ptr< Epetra_Operator > m_precond;
 
  array2d< real64 > m_nullSpacePointer;
};
 
}
 
#endif //GEOS_LINEARALGEBRA_INTERFACES_TRILINOSPRECONDITIONER_HPP_