Dune Core Modules (2.8.0)

schwarz.hh
1// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2// vi: set et ts=4 sw=2 sts=2:
3#ifndef DUNE_ISTL_SCHWARZ_HH
4#define DUNE_ISTL_SCHWARZ_HH
5
6#include <iostream> // for input/output to shell
7#include <fstream> // for input/output to files
8#include <vector> // STL vector class
9#include <sstream>
10
11#include <cmath> // Yes, we do some math here
12
13#include <dune/common/timer.hh>
14
15#include "io.hh"
16#include "bvector.hh"
17#include "vbvector.hh"
18#include "bcrsmatrix.hh"
19#include "io.hh"
20#include "gsetc.hh"
21#include "ilu.hh"
22#include "operators.hh"
23#include "solvers.hh"
24#include "preconditioners.hh"
25#include "scalarproducts.hh"
26#include "owneroverlapcopy.hh"
27
28namespace Dune {
29
74 template<class M, class X, class Y, class C>
76 {
77 public:
82 typedef M matrix_type;
87 typedef X domain_type;
92 typedef Y range_type;
94 typedef typename X::field_type field_type;
100
109 : _A_(stackobject_to_shared_ptr(A)), communication(com)
110 {}
111
112 OverlappingSchwarzOperator (const std::shared_ptr<matrix_type> A, const communication_type& com)
113 : _A_(A), communication(com)
114 {}
115
117 virtual void apply (const X& x, Y& y) const
118 {
119 y = 0;
120 _A_->umv(x,y); // result is consistent on interior+border
121 communication.project(y); // we want this here to avoid it before the preconditioner
122 // since there d is const!
123 }
124
126 virtual void applyscaleadd (field_type alpha, const X& x, Y& y) const
127 {
128 _A_->usmv(alpha,x,y); // result is consistent on interior+border
129 communication.project(y); // we want this here to avoid it before the preconditioner
130 // since there d is const!
131 }
132
134 virtual const matrix_type& getmat () const
135 {
136 return *_A_;
137 }
138
141 {
143 }
144
145
148 {
149 return communication;
150 }
151 private:
152 const std::shared_ptr<const matrix_type>_A_;
153 const communication_type& communication;
154 };
155
158 /*
159 * @addtogroup ISTL_Prec
160 * @{
161 */
175 template<class M, class X, class Y, class C>
176 class ParSSOR : public Preconditioner<X,Y> {
177 public:
179 typedef M matrix_type;
181 typedef X domain_type;
183 typedef Y range_type;
185 typedef typename X::field_type field_type;
188
198 ParSSOR (const matrix_type& A, int n, field_type w, const communication_type& c)
199 : _A_(A), _n(n), _w(w), communication(c)
200 { }
201
207 virtual void pre (X& x, Y& b)
208 {
209 communication.copyOwnerToAll(x,x); // make dirichlet values consistent
210 }
211
217 virtual void apply (X& v, const Y& d)
218 {
219 for (int i=0; i<_n; i++) {
220 bsorf(_A_,v,d,_w);
221 bsorb(_A_,v,d,_w);
222 }
223 communication.copyOwnerToAll(v,v);
224 }
225
231 virtual void post (X& x) {}
232
235 {
237 }
238
239 private:
241 const matrix_type& _A_;
243 int _n;
245 field_type _w;
247 const communication_type& communication;
248 };
249
250 namespace Amg
251 {
252 template<class T> struct ConstructionTraits;
253 }
254
278 template<class X, class Y, class C, class P=Preconditioner<X,Y> >
280 friend struct Amg::ConstructionTraits<BlockPreconditioner<X,Y,C,P> >;
281 public:
286 typedef X domain_type;
291 typedef Y range_type;
293 typedef typename X::field_type field_type;
299
308 : _preconditioner(stackobject_to_shared_ptr(p)), _communication(c)
309 { }
310
318 BlockPreconditioner (const std::shared_ptr<P>& p, const communication_type& c)
319 : _preconditioner(p), _communication(c)
320 { }
321
327 virtual void pre (X& x, Y& b)
328 {
329 _communication.copyOwnerToAll(x,x); // make dirichlet values consistent
330 _preconditioner->pre(x,b);
331 }
332
338 virtual void apply (X& v, const Y& d)
339 {
340 _preconditioner->apply(v,d);
341 _communication.copyOwnerToAll(v,v);
342 }
343
344 template<bool forward>
345 void apply (X& v, const Y& d)
346 {
347 _preconditioner->template apply<forward>(v,d);
348 _communication.copyOwnerToAll(v,v);
349 }
350
356 virtual void post (X& x)
357 {
358 _preconditioner->post(x);
359 }
360
363 {
365 }
366
367 private:
369 std::shared_ptr<P> _preconditioner;
370
372 const communication_type& _communication;
373 };
374
377} // end namespace
378
379#endif
Implementation of the BCRSMatrix class.
This file implements a vector space as a tensor product of a given vector space. The number of compon...
A linear operator exporting itself in matrix form.
Definition: operators.hh:107
Block parallel preconditioner.
Definition: schwarz.hh:279
virtual void pre(X &x, Y &b)
Prepare the preconditioner.
Definition: schwarz.hh:327
X domain_type
The domain type of the preconditioner.
Definition: schwarz.hh:286
BlockPreconditioner(const std::shared_ptr< P > &p, const communication_type &c)
Constructor.
Definition: schwarz.hh:318
virtual void apply(X &v, const Y &d)
Apply the preconditioner.
Definition: schwarz.hh:338
BlockPreconditioner(P &p, const communication_type &c)
Constructor.
Definition: schwarz.hh:307
void apply(X &v, const Y &d)
Apply one step of the preconditioner to the system A(v)=d.
Definition: schwarz.hh:345
C communication_type
The type of the communication object..
Definition: schwarz.hh:298
X::field_type field_type
The field type of the preconditioner.
Definition: schwarz.hh:293
virtual void post(X &x)
Clean up.
Definition: schwarz.hh:356
Y range_type
The range type of the preconditioner.
Definition: schwarz.hh:291
virtual SolverCategory::Category category() const
Category of the preconditioner (see SolverCategory::Category)
Definition: schwarz.hh:362
X::field_type field_type
The field type of the operator.
Definition: operators.hh:72
An overlapping Schwarz operator.
Definition: schwarz.hh:76
const communication_type & getCommunication() const
Get the object responsible for communication.
Definition: schwarz.hh:147
virtual const matrix_type & getmat() const
get the sequential assembled linear operator.
Definition: schwarz.hh:134
virtual void applyscaleadd(field_type alpha, const X &x, Y &y) const
apply operator to x, scale and add:
Definition: schwarz.hh:126
virtual void apply(const X &x, Y &y) const
apply operator to x:
Definition: schwarz.hh:117
C communication_type
The type of the communication object.
Definition: schwarz.hh:99
X domain_type
The type of the domain.
Definition: schwarz.hh:87
M matrix_type
The type of the matrix we operate on.
Definition: schwarz.hh:82
Y range_type
The type of the range.
Definition: schwarz.hh:92
X::field_type field_type
The field type of the range.
Definition: schwarz.hh:94
OverlappingSchwarzOperator(const matrix_type &A, const communication_type &com)
constructor: just store a reference to a matrix.
Definition: schwarz.hh:108
virtual SolverCategory::Category category() const
Category of the linear operator (see SolverCategory::Category)
Definition: schwarz.hh:140
A parallel SSOR preconditioner.
Definition: schwarz.hh:176
X::field_type field_type
The field type of the preconditioner.
Definition: schwarz.hh:185
C communication_type
The type of the communication object.
Definition: schwarz.hh:187
virtual SolverCategory::Category category() const
Category of the preconditioner (see SolverCategory::Category)
Definition: schwarz.hh:234
ParSSOR(const matrix_type &A, int n, field_type w, const communication_type &c)
Constructor.
Definition: schwarz.hh:198
virtual void post(X &x)
Clean up.
Definition: schwarz.hh:231
X domain_type
The domain type of the preconditioner.
Definition: schwarz.hh:181
Y range_type
The range type of the preconditioner.
Definition: schwarz.hh:183
M matrix_type
The matrix type the preconditioner is for.
Definition: schwarz.hh:179
virtual void apply(X &v, const Y &d)
Apply the precondtioner.
Definition: schwarz.hh:217
virtual void pre(X &x, Y &b)
Prepare the preconditioner.
Definition: schwarz.hh:207
Base class for matrix free definition of preconditioners.
Definition: preconditioner.hh:30
X::field_type field_type
The field type of the preconditioner.
Definition: preconditioner.hh:37
Some generic functions for pretty printing vectors and matrices.
void bsorb(const M &A, X &x, const Y &b, const K &w)
SSOR step.
Definition: gsetc.hh:644
void bsorf(const M &A, X &x, const Y &b, const K &w)
SOR step.
Definition: gsetc.hh:632
Simple iterative methods like Jacobi, Gauss-Seidel, SOR, SSOR, etc. in a generic way.
The incomplete LU factorization kernels.
Dune namespace.
Definition: alignedallocator.hh:11
std::shared_ptr< T > stackobject_to_shared_ptr(T &t)
Create a shared_ptr for a stack-allocated object.
Definition: shared_ptr.hh:70
Define general, extensible interface for operators. The available implementation wraps a matrix.
Classes providing communication interfaces for overlapping Schwarz methods.
Define general preconditioner interface.
Define base class for scalar product and norm.
Implementations of the inverse operator interface.
Traits class for generically constructing non default constructable types.
Definition: construction.hh:37
Category
Definition: solvercategory.hh:21
@ overlapping
Category for overlapping solvers.
Definition: solvercategory.hh:27
A simple timing class.
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