PetscSolverGlobalMatrix.h 4.6 KB
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// ============================================================================
// ==                                                                        ==
// == AMDiS - Adaptive multidimensional simulations                          ==
// ==                                                                        ==
// ==  http://www.amdis-fem.org                                              ==
// ==                                                                        ==
// ============================================================================
//
// Software License for AMDiS
//
// Copyright (c) 2010 Dresden University of Technology 
// All rights reserved.
// Authors: Simon Vey, Thomas Witkowski et al.
//
// This file is part of AMDiS
//
// See also license.opensource.txt in the distribution.



/** \file PetscSolverGlobalMatrix.h */

#ifndef AMDIS_PETSC_SOLVER_GLOBAL_MATRIX_H
#define AMDIS_PETSC_SOLVER_GLOBAL_MATRIX_H

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#include <boost/tuple/tuple.hpp>
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#include "AMDiS_fwd.h"
#include "parallel/PetscSolver.h"

namespace AMDiS {

  using namespace std;

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  /** \brief
   * Defines for each system component a mapping for sets of global DOF indices
   * to global matrix indices. The mapping is defined for all DOFs in rank's 
   * subdomain. When periodic boundary conditions are used, then the mapping
   * stores also information for the periodic associations of rank's DOF on
   * periodic boundaries.
   */
  class DofToMatIndex
  {
  public:
    DofToMatIndex() {}

    /// Reset the data structure.
    inline void clear()
    {
      data.clear();
    }

    /// Add a new mapping.
    inline void add(int component, DegreeOfFreedom dof, int globalMatIndex)
    {
      data[component][dof] = globalMatIndex;
    }

    /// Map a global DOF index to the global matrix index for a specific 
    /// system component number.
    inline int get(int component, DegreeOfFreedom dof)
    {
      FUNCNAME("DofToMatIndex::get()");

      TEST_EXIT_DBG(data.count(component))
	("No mapping data for component %d available!\n", component);

      TEST_EXIT_DBG(data[component].count(dof))
	("Mapping for DOF %d in component %d does not exists!\n",
	 dof, component);

      return data[component][dof];
    }

  private:
    /// The mapping data. For each system component there is a specific map that
    /// maps global DOF indices to global matrix indices.
    map<int, map<DegreeOfFreedom, int> > data;
  };



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  class PetscSolverGlobalMatrix : public PetscSolver
  {
  public:
    PetscSolverGlobalMatrix()
      : PetscSolver(),
	d_nnz(NULL),
	o_nnz(NULL),
	lastMeshNnz(0),
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	zeroStartVector(false),
	alwaysCreateNnzStructure(false)
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    {
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      Parameters::get("parallel->use zero start vector", zeroStartVector);
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      Parameters::get("parallel->always create nnz structure", 
		      alwaysCreateNnzStructure);
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    }

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    void fillPetscMatrix(Matrix<DOFMatrix*> *mat);

    void fillPetscRhs(SystemVector *vec);
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    void solvePetscMatrix(SystemVector &vec, AdaptInfo *adaptInfo);    

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    void destroyMatrixData();
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  protected:
    /// Creates a new non zero pattern structure for the PETSc matrix. 
    void createPetscNnzStructure(Matrix<DOFMatrix*> *mat);
    
    /// Takes a DOF matrix and sends the values to the global PETSc matrix.
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    void setDofMatrix(DOFMatrix* mat, int nRowMat = 0, int nColMat = 0);
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    /// Takes a DOF vector and sends its values to a given PETSc vector.
    void setDofVector(Vec& petscVec, DOFVector<double>* vec, 
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		      int nRowVec, bool rankOnly = false);
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    void createGlobalDofMapping(vector<const FiniteElemSpace*> &feSpaces);

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  protected:
    /// Arrays definig the non zero pattern of Petsc's matrix.
    int *d_nnz, *o_nnz;

    /** \brief
     * Stores the mesh change index of the mesh the nnz structure was created for.
     * Therefore, if the mesh change index is higher than this value, we have to create
     * a new nnz structure for PETSc matrices, because the mesh has been changed and
     * therefore also the assembled matrix structure.
     */
    int lastMeshNnz;

    bool zeroStartVector;
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    /// If this variable is set to true, the non-zero matrix structure is
    /// created each time from scratch by calling \ref createPetscNnzStrcuture.
    /// This can be necessary if the number of non-zeros in the matrix varies
    /// though the mesh does not change. This may happen if there are many
    /// operators using DOFVectors from old timestep containing many zeros due to
    /// some phase fields.
    bool alwaysCreateNnzStructure;
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    /// Mapping from global DOF indices to global matrix indices under 
    /// consideration of possibly multiple components.
    DofToMatIndex dofToMatIndex;
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  };


}

#endif