/usr/include/libmesh/petsc_preconditioner.h is in libmesh-dev 0.7.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | // $Id: petsc_preconditioner.h 3874 2010-07-02 21:57:26Z roystgnr $
// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
// 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
#ifndef __petsc_preconditioner_h__
#define __petsc_preconditioner_h__
#include "libmesh_config.h"
#ifdef LIBMESH_HAVE_PETSC
// C++ includes
// Local includes
#include "preconditioner.h"
#include "libmesh_common.h"
#include "enum_solver_package.h"
#include "enum_preconditioner_type.h"
#include "reference_counted_object.h"
#include "libmesh.h"
// Petsc includes
#include "petscpc.h"
namespace libMesh
{
// forward declarations
template <typename T> class AutoPtr;
template <typename T> class SparseMatrix;
template <typename T> class NumericVector;
template <typename T> class ShellMatrix;
/**
* This class provides an interface to the suite of preconditioners available
* from Petsc.
*
* @author Derek Gaston, 2009
*/
template <typename T>
class PetscPreconditioner : public Preconditioner<T>
{
public:
/**
* Constructor. Initializes PetscPreconditioner data structures
*/
PetscPreconditioner ();
/**
* Destructor.
*/
virtual ~PetscPreconditioner ();
/**
* Computes the preconditioned vector "y" based on input "x".
* Usually by solving Py=x to get the action of P^-1 x.
*/
virtual void apply(const NumericVector<T> & x, NumericVector<T> & y);
/**
* Release all memory and clear data structures.
*/
virtual void clear () {}
/**
* Initialize data structures if not done so already.
*/
virtual void init ();
/**
* Returns the actual Petsc PC struct. Useful for more advanced
* purposes
*/
PC pc() { return _pc; }
/**
* Tells PETSC to use the user-specified preconditioner
*/
static void set_petsc_preconditioner_type (const PreconditionerType & preconditioner_type, PC & pc);
protected:
/**
* Preconditioner context
*/
PC _pc;
/**
* Petsc Matrix that's been pulled out of the _matrix object.
* This happens during init...
*/
Mat _mat;
};
/*----------------------- inline functions ----------------------------------*/
template <typename T>
inline
PetscPreconditioner<T>::PetscPreconditioner () :
Preconditioner<T>()
{
}
template <typename T>
inline
PetscPreconditioner<T>::~PetscPreconditioner ()
{
this->clear ();
}
} // namespace libMesh
#endif // #ifdef LIBMESH_HAVE_PETSC
#endif // #ifdef __petsc_linear_solver_h__
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