petsc_matrix.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2023 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 LIBMESH_PETSC_MATRIX_H
#define LIBMESH_PETSC_MATRIX_H

#include "libmesh/libmesh_common.h"

#ifdef LIBMESH_HAVE_PETSC

// Local includes
#include "libmesh/sparse_matrix.h"
#include "libmesh/petsc_macro.h"

// C++ includes
#include <algorithm>
#ifdef LIBMESH_HAVE_CXX11_THREAD
#include <atomic>
#include <mutex>
#endif

// Macro to identify and debug functions which should be called in
// parallel on parallel matrices but which may be called in serial on
// serial matrices.  This macro will only be valid inside non-static
// PetscMatrix methods
#undef semiparallel_only
#undef exceptionless_semiparallel_only
#ifndef NDEBUG
#include <cstring>

#define semiparallel_only() do { if (this->initialized()) { const char * mytype; \
      MatGetType(_mat,&mytype);                                         \
      if (!strcmp(mytype, MATSEQAIJ))                                   \
        parallel_object_only(); } } while (0)
#define exceptionless_semiparallel_only() do { if (this->initialized()) { const char * mytype; \
      MatGetType(_mat,&mytype);                                         \
      if (!strcmp(mytype, MATSEQAIJ))                                   \
        exceptionless_parallel_object_only(); } } while (0)
#else
#define semiparallel_only()
#define exceptionless_semiparallel_only()
#endif


// Petsc include files.
#ifdef I
# define LIBMESH_SAW_I
#endif
#include <petscmat.h>
#ifndef LIBMESH_SAW_I
# undef I // Avoid complex.h contamination
#endif



namespace libMesh
{

// Forward Declarations
template <typename T> class DenseMatrix;

enum PetscMatrixType : int {
                 AIJ=0,
                 HYPRE};


template <typename T>
class PetscMatrix final : public SparseMatrix<T>
{
public:
  explicit PetscMatrix (const Parallel::Communicator & comm_in);

  explicit PetscMatrix (Mat m,
                      const Parallel::Communicator & comm_in);

  PetscMatrix (PetscMatrix &&) = delete;
  PetscMatrix (const PetscMatrix &) = delete;
  PetscMatrix & operator= (const PetscMatrix &) = delete;
  PetscMatrix & operator= (PetscMatrix &&) = delete;

  virtual ~PetscMatrix ();

  void set_matrix_type(PetscMatrixType mat_type);

  virtual void init (const numeric_index_type m,
                    const numeric_index_type n,
                    const numeric_index_type m_l,
                    const numeric_index_type n_l,
                    const numeric_index_type nnz=30,
                    const numeric_index_type noz=10,
                    const numeric_index_type blocksize=1) override;

  void init (const numeric_index_type m,
            const numeric_index_type n,
            const numeric_index_type m_l,
            const numeric_index_type n_l,
            const std::vector<numeric_index_type> & n_nz,
            const std::vector<numeric_index_type> & n_oz,
            const numeric_index_type blocksize=1);

  virtual void init (ParallelType = PARALLEL) override;

  void update_preallocation_and_zero();

  void reset_preallocation();

  virtual void clear () noexcept override;

  virtual void zero () override;

  virtual std::unique_ptr<SparseMatrix<T>> zero_clone () const override;

  virtual std::unique_ptr<SparseMatrix<T>> clone () const override;

  virtual void zero_rows (std::vector<numeric_index_type> & rows, T diag_value = 0.0) override;

  virtual void close () override;

  virtual void flush () override;

  virtual numeric_index_type m () const override;

  virtual numeric_index_type local_m () const final;

  virtual numeric_index_type n () const override;

  numeric_index_type local_n () const;

  void get_local_size (numeric_index_type & m, numeric_index_type & n) const;

  virtual numeric_index_type row_start () const override;

  virtual numeric_index_type row_stop () const override;

  virtual void set (const numeric_index_type i,
                    const numeric_index_type j,
                    const T value) override;

  virtual void add (const numeric_index_type i,
                    const numeric_index_type j,
                    const T value) override;

  virtual void add_matrix (const DenseMatrix<T> & dm,
                          const std::vector<numeric_index_type> & rows,
                          const std::vector<numeric_index_type> & cols) override;

  virtual void add_matrix (const DenseMatrix<T> & dm,
                          const std::vector<numeric_index_type> & dof_indices) override;

  virtual void add_block_matrix (const DenseMatrix<T> & dm,
                                const std::vector<numeric_index_type> & brows,
                                const std::vector<numeric_index_type> & bcols) override;

  virtual void add_block_matrix (const DenseMatrix<T> & dm,
                                const std::vector<numeric_index_type> & dof_indices) override;

  virtual void add (const T a, const SparseMatrix<T> & X) override;

  virtual void matrix_matrix_mult (SparseMatrix<T> & X, SparseMatrix<T> & Y, bool reuse = false) override;

  virtual void add_sparse_matrix (const SparseMatrix<T> & spm,
                                  const std::map<numeric_index_type,numeric_index_type> & row_ltog,
                                  const std::map<numeric_index_type,numeric_index_type> & col_ltog,
                                  const T scalar) override;

  virtual T operator () (const numeric_index_type i,
                        const numeric_index_type j) const override;

  virtual Real l1_norm () const override;

  virtual Real linfty_norm () const override;

  virtual bool closed() const override;

  virtual void set_destroy_mat_on_exit(bool destroy = true);

  virtual void print_personal(std::ostream & os=libMesh::out) const override;

  virtual void print_matlab(const std::string & name = "") const override;

  virtual void get_diagonal (NumericVector<T> & dest) const override;

  virtual void get_transpose (SparseMatrix<T> & dest) const override;

  void swap (PetscMatrix<T> &);

Mat mat () { libmesh_assert (_mat); return _mat; }

virtual void get_row(numeric_index_type i,
                     std::vector<numeric_index_type> & indices,
                     std::vector<T> & values) const override;

virtual void create_submatrix_nosort(SparseMatrix<T> & submatrix,
                                     const std::vector<numeric_index_type> & rows,
                                     const std::vector<numeric_index_type> & cols) const override;
protected:

virtual void _get_submatrix(SparseMatrix<T> & submatrix,
                            const std::vector<numeric_index_type> & rows,
                            const std::vector<numeric_index_type> & cols,
                            const bool reuse_submatrix) const override;
private:

Mat _mat;

bool _destroy_mat_on_exit;

PetscMatrixType _mat_type;

#ifdef LIBMESH_HAVE_CXX11_THREAD

mutable std::mutex _petsc_matrix_mutex;
#else

mutable Threads::spin_mutex _petsc_matrix_mutex;
#endif
};

} // namespace libMesh

#endif // #ifdef LIBMESH_HAVE_PETSC
#endif // LIBMESH_PETSC_MATRIX_H