KrylovPreconditioner.h 4.77 KB
Newer Older
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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
/******************************************************************************
 *
 * AMDiS - Adaptive multidimensional simulations
 *
 * Copyright (C) 2013 Dresden University of Technology. All Rights Reserved.
 * Web: https://fusionforge.zih.tu-dresden.de/projects/amdis
 *
 * Authors: 
 * Simon Vey, Thomas Witkowski, Andreas Naumann, Simon Praetorius, et al.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *
 * This file is part of AMDiS
 *
 * See also license.opensource.txt in the distribution.
 * 
 ******************************************************************************/


/** \file KrylovPreconditioner.h */

#ifndef AMDIS_KRYLOV_PRECONDITIONER_H
#define AMDIS_KRYLOV_PRECONDITIONER_H

#include "solver/ITL_Preconditioner.h"
#ifdef HAVE_PARALLEL_MTL4
#include "parallel/PITL_Solver.h"
#endif

namespace AMDiS {

  /**
   * \ingroup Solver
   * 
   * \brief Implements an inner solver for (flexible) krylov subspace solvers
   * 
   * Any AMDiS solver can be used as preconditioner for any other AMDiS solver.
   * Initfile-syntax:<br />
   * [...]->solver: any-krylov-solver<br />
   * [...]->solver->left precon: [krylov|solver]<br />
   * [...]->solver->left precon->solver: any-amdis-solver<br />
   * [...]->solver->left precon->solver->parameter1: ...<br />
   * [...]->solver->left precon->solver->parameter2: ...<br />
   * [...]->solver->left precon->solver->parameter3: ...
   * 
   * This Krylov-Preconditioner can also be used as preconditioner for the inner solver, so
   * that a sequence of iner-inner-solver can be loaded.
   **/

  template< typename MatrixType, typename VectorType >
  struct KrylovPreconditioner : ITL_BasePreconditioner< MatrixType, VectorType >
  {
    typedef ITL_BasePreconditioner< MatrixType, VectorType > super;
    
    class Creator : public CreatorInterfaceName< super >
    {
    public:
      virtual ~Creator() {}
      
      super* create() { 
	return new KrylovPreconditioner(this->name);
      }
    };
    
    KrylovPreconditioner(std::string name) : fullMatrix(NULL), solver(NULL), runner(NULL)
    {

  #if defined HAVE_PARALLEL_PETSC
      string backend("p_petsc");
  #elif defined HAVE_PARALLEL_MTL
      string backend("p_mtl");
  #elif defined HAVE_PETSC
      string backend("petsc");
  #else
      string backend("mtl");
  #endif
      
      // === read backend-name ===
      string initFileStr = name + "->solver";    
      Parameters::get(initFileStr + "->backend", backend);

      // === read solver-name ===
      string solverType("0");
      Parameters::get(initFileStr, solverType);
      
      if (backend != "0" && backend != "no" && backend != "")
	solverType = backend + "_" + solverType;
    
      LinearSolverCreator *solverCreator = 
	dynamic_cast<LinearSolverCreator*>(CreatorMap<LinearSolver>::getCreator(solverType, initFileStr));
      TEST_EXIT(solverCreator)
	("No valid solver type found in parameter \"%s\"\n", initFileStr.c_str());
      solverCreator->setName(initFileStr);
      solver = solverCreator->create();
      
      runner = dynamic_cast<MTL4Runner< MatrixType, VectorType >*>(solver->getRunner());
    }
    
    virtual ~KrylovPreconditioner()
    {
      delete solver;
    }
    
    virtual void init(const typename super::BlockMatrix& A, const MatrixType& fullMatrix_) 
    {
      fullMatrix = &fullMatrix_;
      runner->init(A, fullMatrix_);
    }
    
    virtual void exit()
    {
      runner->exit();
    }
    
    virtual void solve(const VectorType& b, VectorType& x) const
    {
      initVector(x);
      runner->solve(*fullMatrix, x, b);
    }
    
    virtual void adjoint_solve(const VectorType& b, VectorType& x) const
    {
      initVector(x);
      runner->adjoint_solve(*fullMatrix, x, b);
    }
    
  protected: // methods
    
    template<typename VectorT>
    typename boost::enable_if< mtl::traits::is_distributed<VectorT>, void >::type
    initVector(VectorT& x) const
    {
#ifdef HAVE_PARALLEL_MTL4
      x.init_distribution(col_distribution(*fullMatrix), num_cols(*fullMatrix));
#endif
      set_to_zero(x);
    }
    
    template<typename VectorT>
    typename boost::disable_if< mtl::traits::is_distributed<VectorT>, void >::type
    initVector(VectorT& x) const
    {
      x.change_dim(num_cols(*fullMatrix));
      set_to_zero(x);
    }
    
  protected: // member variables

    const MatrixType* fullMatrix;
    
    LinearSolver* solver;
    MTL4Runner< MatrixType, VectorType >* runner;
  };
  
  
#ifdef HAVE_PARALLEL_MTL4
  typedef KrylovPreconditioner<MTLTypes::PMTLMatrix, MTLTypes::PMTLVector> KrylovPreconditionerParallel;
#endif
  typedef KrylovPreconditioner<MTLTypes::MTLMatrix, MTLTypes::MTLVector> KrylovPreconditionerSeq;

  
} // end namespace AMDiS

#endif // AMDIS_KRYLOV_PRECONDITIONER_H