petsc_shell_matrix.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2019 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
 
#include "libmesh/libmesh_config.h"
#ifdef LIBMESH_HAVE_PETSC
 
// Local includes
#include "libmesh/petsc_shell_matrix.h"
 
namespace libMesh
{
 
template <typename T>
void PetscShellMatrix<T>::vector_mult (NumericVector<T> & dest,
                                        const NumericVector<T> & arg) const
{
  PetscErrorCode ierr=0;
 
  PetscVector<T> & petsc_dest = cast_ref<PetscVector<T> &>(dest);
 
  const PetscVector<T> & petsc_arg = cast_ref<const PetscVector<T> &>(arg);
 
  ierr = MatMult(_mat, petsc_arg.vec(), petsc_dest.vec());
  LIBMESH_CHKERR(ierr);
}
 
 
 
template <typename T>
void PetscShellMatrix<T>::vector_mult_add (NumericVector<T> & dest,
                                            const NumericVector<T> & arg) const
{
  PetscErrorCode ierr=0;
 
  PetscVector<T> & petsc_dest = cast_ref<PetscVector<T> &>(dest);
 
  const PetscVector<T> & petsc_arg = cast_ref<const PetscVector<T> &>(arg);
 
  ierr = MatMultAdd(_mat, petsc_arg.vec(), petsc_dest.vec(), petsc_dest.vec());
  LIBMESH_CHKERR(ierr);
}
 
 
template <typename T>
void PetscShellMatrix<T>::clear ()
{
  PetscErrorCode ierr=0;
 
  if ((this->initialized()))
    {
      ierr = LibMeshMatDestroy (&_mat);
      LIBMESH_CHKERR(ierr);
 
      this->_is_initialized = false;
    }
}
 
 
template <typename T>
void PetscShellMatrix<T>::init ()
{
  libmesh_assert(this->_dof_map);
 
  // Clear initialized matrices
  if (this->initialized())
    this->clear();
 
  this->_is_initialized = true;
 
 
  const numeric_index_type my_m = this->_dof_map->n_dofs();
  const numeric_index_type my_n = my_m;
  const numeric_index_type n_l  = this->_dof_map->n_dofs_on_processor(this->processor_id());
  const numeric_index_type m_l  = n_l;
 
 
  PetscErrorCode ierr = 0;
  PetscInt m_global   = static_cast<PetscInt>(my_m);
  PetscInt n_global   = static_cast<PetscInt>(my_n);
  PetscInt m_local    = static_cast<PetscInt>(m_l);
  PetscInt n_local    = static_cast<PetscInt>(n_l);
 
  ierr = MatCreate(this->comm().get(), &_mat);
  LIBMESH_CHKERR(ierr);
  ierr = MatSetSizes(_mat, m_local, n_local, m_global, n_global);
  LIBMESH_CHKERR(ierr);
  PetscInt blocksize  = static_cast<PetscInt>(this->_dof_map->block_size());
  ierr = MatSetBlockSize(_mat,blocksize);
  LIBMESH_CHKERR(ierr);
 
  ierr = MatSetType(_mat, MATSHELL);
  LIBMESH_CHKERR(ierr);
 
  // Is prefix information available somewhere? Perhaps pass in the system name?
  ierr = MatSetOptionsPrefix(_mat, "");
  LIBMESH_CHKERR(ierr);
  ierr = MatSetFromOptions(_mat);
  LIBMESH_CHKERR(ierr);
  ierr = MatSetUp(_mat);
  LIBMESH_CHKERR(ierr);
}
 
//------------------------------------------------------------------
// Explicit instantiations
template class PetscShellMatrix<Number>;
 
} // namespace libMesh
 
#endif