PetscSolverFeti.h 10.9 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 PetscSolverFeti.h */

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#include <map>
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#include "AMDiS_fwd.h"
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#include "parallel/MpiHelper.h"
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#include "parallel/PetscSolver.h"
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#include "parallel/PetscSolverFetiStructs.h"
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#include "parallel/ParallelDofMapping.h"
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#include "parallel/ParallelTypes.h"
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#ifndef AMDIS_PETSC_SOLVER_FETI_H
#define AMDIS_PETSC_SOLVER_FETI_H

namespace AMDiS {

  using namespace std;

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  /** \brief
   * FETI-DP implementation based on PETSc.
   */
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  class PetscSolverFeti : public PetscSolver
  {
  public:
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    /// Constructor of FETI-DP solver class.
    PetscSolverFeti(string name);
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    /// Assemble the sequentially created matrices to the global matrices
    /// required by the FETI-DP method.
    void fillPetscMatrix(Matrix<DOFMatrix*> *mat);

    /// Assembles the global rhs vectors from the sequentially created ones.
    void fillPetscRhs(SystemVector *vec);
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    /// Solve the system using FETI-DP method.
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    void solvePetscMatrix(SystemVector &vec, AdaptInfo *adaptInfo);
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    /// Destroys all matrix data structures.
    void destroyMatrixData();

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    /// Detroys all vector data structures.
    void destroyVectorData();

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    /// Returns flags to denote which information of the boundary DOFs are 
    /// required by the FETI-DP solver.
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    Flag getBoundaryDofRequirement()
    {
      return 
	MeshDistributor::BOUNDARY_SUBOBJ_SORTED |
	MeshDistributor::BOUNDARY_FILL_INFO_SEND_DOFS |
	MeshDistributor::BOUNDARY_FILL_INFO_RECV_DOFS;
    }
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    /// Initialization of the FETI-DPdata structures.
    void initialize();
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    int getNumberOfPrimals()
    {
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      return primalDofMap.getOverallDofs();
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    }
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    int getNumberOfRankPrimals()
    {
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      return primalDofMap.getRankDofs();
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    }

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    int getNumberOfDuals()
    {
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      return dualDofMap.getOverallDofs();
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    }

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    int getNumberOfRankDuals()
    {
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      return dualDofMap.getRankDofs();
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    }

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    int getNumberOfLagrange()
    {
      return lagrangeMap.getOverallDofs();
    }

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  protected:
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    ///
    void createDirichletData(Matrix<DOFMatrix*> &mat);

    /// After mesh changes, or if the solver is called the first time, this
    /// function creates all information about primal nodes, dual nodes and
    /// lagrange constraints.    
    void createFetiData();

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    /// Defines which boundary nodes are primal. Creates global index of
    /// the primal variables.
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    void createPrimals(int component);
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    /// Defines the set of dual variables and creates the global index of
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    /// dual variables.
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    void createDuals(int component);
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    /// 
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    void createInterfaceNodes(int component);
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    /// Create Lagrange multiplier variables corresponding to the dual 
    /// variables.
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    void createLagrange(int component);
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    void createAugmentedLagrange(int component);
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    /// Creates a global index of the B variables.
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    void createIndexB(int component);
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    /// Creates the Lagrange multiplier constraints and assembles them 
    /// to \ref mat_lagrange.
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    void createMatLagrange();
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    std::set<BoundaryObject> getAugmentedLagrange();

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    void createMatAugmentedLagrange();
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    bool testWirebasketEdge(BoundaryObject &edge, const FiniteElemSpace *feSpace);

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    ///
    void createPreconditionerMatrix(Matrix<DOFMatrix*> *mat);

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    /// Creates PETSc KSP solver object for solving the Schur complement
    /// system on the primal variables, \ref ksp_schur_primal
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    void createSchurPrimalKsp();
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    ///
    void createMatExplicitSchurPrimal();
    
    ///
    void createMatExplicitAugmentedSchurPrimal();

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    /// Destroys PETSc KSP solver object \ref ksp_schur_primal
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    void destroySchurPrimalKsp();

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    /// Creates PETSc KSP solver object for the FETI-DP operator, \ref ksp_feti
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    void createFetiKsp();
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    /// Destroys FETI-DP operator, \ref ksp_feti
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    void destroyFetiKsp();

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    /// Create the null space of the FETI-DP operator (if there is one) and
    /// attachets it to the corresponding matrices and KSP objects.
    void createNullSpace();

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    /// In debug modes, this function runs some debug tests on the FETI
    /// matrices. In optimized mode, nothing is done here.
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    void dbgMatrix(Matrix<DOFMatrix*> *mat);
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    /** \brief
     * Recovers AMDiS solution vector from PETSc's solution vectors of the
     * FETI-DP system. First, the B variables can locally be copied to the
     * corresponding entries in the DOF vectors. The primal variable must
     * be communicated such that all ranks sharing a primal get a copy of
     * the corresponding value.
     *
     * \param[in]   vec_sol_b        Global PETSc vector of the solution of
     *                               the B variables.
     * \param[in]   vec_sol_primal   Global PETSc vector of the solution of
     *                               the primal variables.
     * \param[out]  vec              SystemVector containing all solution 
     *                               DOF vectors.
     */
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    void recoverSolution(Vec &vec_sol_b,
			 Vec &vec_sol_primal,
			 SystemVector &vec);

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    ///
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    void recoverInterfaceSolution(Vec& vecInterface, 
				  SystemVector &vec);

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    /** \brief
     * Solves the FETI-DP system globally, thus without reducing it to the 
     * Lagrange multipliers. This should be used for debugging only to test
     * if the FETI-DP system is setup correctly.
     *
     * \param[out]  vec    Solution DOF vectors.
     */
    void solveFetiMatrix(SystemVector &vec);

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    /** \brief
     * Solves the FETI-DP system with reducing it first to the Lagrange
     * multipliers. This is what one expects when using the FETI-DP methid :)
     *
     * \param[out]  vec    Solution DOF vectors.
     */
    void solveReducedFetiMatrix(SystemVector &vec);

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    void resetStatistics();

    void printStatistics();

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    /// Checks whether a given DOF is a primal DOF in a given component.
    inline bool isPrimal(int component, DegreeOfFreedom dof)
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    {
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      return primalDofMap[component].isSet(dof);
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    }

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    /// Checks whether a given DOF is a dual DOF in a given component.
    inline bool isDual(int component, DegreeOfFreedom dof)
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    {
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      return dualDofMap[component].isSet(dof);
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    }

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    /// Checks whether a given DOF is an interface DOF in a given component.
    inline bool isInterface(int component, DegreeOfFreedom dof)
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    {
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      if (component == pressureComponent)
	return interfaceDofMap[component].isSet(dof);
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      return false;
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    }

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  protected:
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    /// Mapping from primal DOF indices to a global index of primals.
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    ParallelDofMapping primalDofMap;
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    /// Mapping from dual DOF indices to a global index of duals.
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    ParallelDofMapping dualDofMap;
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    /// Mapping from interface DOF indices to a global index of interface 
    /// nodes. This is mainly used for Stokes-like solvers, where the pressure
    /// interface nodes are neither primal nor dual.
    ParallelDofMapping interfaceDofMap;

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    /// Index for each non primal DOF to the global index of B variables (thus,
    /// all pure local variables).
    ParallelDofMapping localDofMap;

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    /// Stores to each dual DOF index the index of the first Lagrange
    /// constraint that is assigned to this DOF.
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    ParallelDofMapping lagrangeMap;
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    /// Mapping of pure local DOF indices, thus no primal and no dual DOFs are
    /// in this map. Is used for the Dirichlet preconditioner only.
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    ParallelDofMapping interiorDofMap;
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    /// Stores to all dual boundary DOFs in each FE space the set of
    /// ranks which contain this global DOF.
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    map<const FiniteElemSpace*, DofIndexToPartitions> boundaryDofRanks;
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    /// Global PETSc matrix of Lagrange variables.
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    Mat mat_lagrange;

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    ///
    Mat mat_augmented_lagrange; 

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    /// 0: Solve the Schur complement on primal variables with iterative solver.
    /// 1: Create the Schur complement matrix explicitly and solve it with a
    ///    direct solver.
    int schurPrimalSolver;

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    /// PETSc solver object to solve the Schur complement on the 
    /// primal variables.
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    KSP ksp_schur_primal;

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    /// Matrix object that defines a matrix-free implementation for the action
    /// of the Schur complement on the primal variables.
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    Mat mat_schur_primal;

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    /// Data for MatMult operation in matrix \ref mat_schur_primal
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    SchurPrimalData schurPrimalData;
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    ///
    SchurPrimalAugmentedData schurPrimalAugmentedData;

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    /// PETSc solver object to solve a system with FETI-DP.    
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    KSP ksp_feti;

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    /// Matrix object that defines a matrix-free implementation for the action
    /// of the FETI-DP operator.
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    Mat mat_feti;
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    /// Data for MatMult operation in matrix \ref mat_feti
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    FetiData fetiData;
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    /// Defines which preconditioner should be used to solve the reduced
    /// FETI-DP system.
    FetiPreconditioner fetiPreconditioner;

    /// Preconditioner object for the reduced FETI-DP system.
    PC precon_feti;
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    Mat mat_lagrange_scaled;
   
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    FetiDirichletPreconData fetiDirichletPreconData;
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    FetiLumpedPreconData fetiLumpedPreconData;
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    FetiInterfaceLumpedPreconData fetiInterfaceLumpedPreconData;

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    FetiKspData fetiKspData;

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    /// Matrices for Dirichlet preconditioner.
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    Mat mat_interior_interior, mat_duals_duals, mat_interior_duals, mat_duals_interior;
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    KSP ksp_interior;
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    bool multiLevelTest;

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    PetscSolver *subdomain;
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    PetscSolver *massMatrixSolver;

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    int meshLevel;
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    int rStartInterior;

    int nGlobalOverallInterior;
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    bool printTimings;
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    bool augmentedLagrange;

    int nRankEdges;

    int nOverallEdges;

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    /// There are two different dirichlet modes:
    ///   0: dirichlet rows are zeroed and a diagonal element is set to one.
    ///   1: dirichlet rows are removed (this mode does not work correctly, but
    ///      many function are prepered to make use of it)
    int dirichletMode;

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    /// If true, the FETI-DP solver is applied to a Stokes like problem. Thus, 
    /// there is a pressure variable which is not part of the coarse grid
    /// problem.
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    bool stokesMode;

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    /// Only used if \ref stokesMode is enabled. In this case, this variable
    /// defines the component number of the pressure variable.
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    int pressureComponent;
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    /// Maps from component number to set of DOFs which are Dirichlet DOfs in
    /// this component.
    map<int, std::set<DegreeOfFreedom> > dirichletRows;
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    friend class PetscSolverFetiDebug;
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  };
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}

#endif