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test/OverlappingRowMatrix_LL/cxx_main.cpp
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1/*@HEADER
2// ***********************************************************************
3//
4// Ifpack: Object-Oriented Algebraic Preconditioner Package
5// Copyright (2002) Sandia Corporation
6//
7// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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42
43#include "Ifpack_ConfigDefs.h"
44
45#ifdef HAVE_MPI
46#include "Epetra_MpiComm.h"
47#else
48#include "Epetra_SerialComm.h"
49#endif
50#include "Epetra_CrsMatrix.h"
51#include "Epetra_Vector.h"
53#include "Epetra_Map.h"
54#include "Epetra_Import.h"
55#include "Epetra_Time.h"
56#include "Galeri_Maps.h"
57#include "Galeri_CrsMatrices.h"
58#include "Teuchos_ParameterList.hpp"
59#include "Teuchos_RefCountPtr.hpp"
61#include "Ifpack_LocalFilter.h"
62#include "Ifpack_Utils.h"
63
64int main(int argc, char *argv[])
65{
66#ifdef HAVE_MPI
67 MPI_Init(&argc,&argv);
68 Epetra_MpiComm Comm( MPI_COMM_WORLD );
69#else
71#endif
72
73 if (Comm.NumProc() == 1)
74 {
75#ifdef HAVE_MPI
76 MPI_Finalize();
77#endif
78 cout << "Test `TestOverlappingRowMatrix.exe' passed!" << endl;
79 exit(EXIT_SUCCESS);
80 }
81
82 Teuchos::ParameterList GaleriList;
83 int nx = 100;
84 GaleriList.set("n", nx * nx);
85 GaleriList.set("nx", nx);
86 GaleriList.set("ny", nx);
87 Teuchos::RefCountPtr<Epetra_Map> Map = Teuchos::rcp( Galeri::CreateMap64("Linear", Comm, GaleriList) );
88 Teuchos::RefCountPtr<Epetra_CrsMatrix> A = Teuchos::rcp( Galeri::CreateCrsMatrix("Laplace2D", &*Map, GaleriList) );
89
90 int OverlapLevel = 5;
91 Epetra_Time Time(Comm);
92
93 // ======================================== //
94 // Build the overlapping matrix using class //
95 // Ifpack_OverlappingRowMatrix. //
96 // ======================================== //
97
98 Time.ResetStartTime();
99 Ifpack_OverlappingRowMatrix B(A,OverlapLevel);
100 if (Comm.MyPID() == 0)
101 cout << "Time to create B = " << Time.ElapsedTime() << endl;
102
103 long long NumGlobalRowsB = B.NumGlobalRows64();
104 long long NumGlobalNonzerosB = B.NumGlobalNonzeros64();
105
106 Epetra_Vector X(A->RowMatrixRowMap());
107 Epetra_Vector Y(A->RowMatrixRowMap());
108 for (int i = 0 ; i < A->NumMyRows() ; ++i)
109 X[i] = 1.0* A->RowMatrixRowMap().GID64(i);
110 Y.PutScalar(0.0);
111
112 Epetra_Vector ExtX_B(B.RowMatrixRowMap());
113 Epetra_Vector ExtY_B(B.RowMatrixRowMap());
114 ExtY_B.PutScalar(0.0);
115
117 IFPACK_CHK_ERR(B.Multiply(false,ExtX_B,ExtY_B));
119
120 double Norm_B;
121 Y.Norm2(&Norm_B);
122 if (Comm.MyPID() == 0)
123 cout << "Norm of Y using B = " << Norm_B << endl;
124
125 // ================================================== //
126 //Build the overlapping matrix as an Epetra_CrsMatrix //
127 // ================================================== //
128
129 Time.ResetStartTime();
131 *(Ifpack_CreateOverlappingCrsMatrix(&*A,OverlapLevel));
132 if (Comm.MyPID() == 0)
133 cout << "Time to create C = " << Time.ElapsedTime() << endl;
134
135 // simple checks on global quantities
136 long long NumGlobalRowsC = C.NumGlobalRows64();
137 long long NumGlobalNonzerosC = C.NumGlobalNonzeros64();
138 if (NumGlobalRowsB != NumGlobalRowsC) {
139 std::ostringstream os;
140 os << "NumGlobalRowsB = " << NumGlobalRowsB
141 << " != NumGlobalRowsC = " << NumGlobalRowsC << ".";
142 throw std::logic_error (os.str ());
143 }
144 if (NumGlobalNonzerosB != NumGlobalNonzerosC) {
145 std::ostringstream os;
146 os << "NumGlobalNonzerosB = " << NumGlobalNonzerosB
147 << " != NumGlobalNonzerosC = " << NumGlobalNonzerosC << ".";
148 throw std::logic_error (os.str ());
149 }
150
151 Epetra_Vector ExtX_C(C.RowMatrixRowMap());
152 Epetra_Vector ExtY_C(C.RowMatrixRowMap());
153 ExtY_C.PutScalar(0.0);
154 Y.PutScalar(0.0);
155
156 IFPACK_CHK_ERR(C.Multiply(false,X,Y));
157
158 double Norm_C;
159 Y.Norm2(&Norm_C);
160 if (Comm.MyPID() == 0)
161 cout << "Norm of Y using C = " << Norm_C << endl;
162
163 if (IFPACK_ABS(Norm_B - Norm_C) > 1e-5)
164 IFPACK_CHK_ERR(-1);
165
166 // ======================= //
167 // now localize the matrix //
168 // ======================= //
169
170 Ifpack_LocalFilter D(Teuchos::rcp(&B, false));
171
172#ifdef HAVE_MPI
173 MPI_Finalize() ;
174#endif
175
176 if (Comm.MyPID() == 0)
177 cout << "Test `TestOverlappingRowMatrix.exe' passed!" << endl;
178
179 return(EXIT_SUCCESS);
180}
Add
#define IFPACK_CHK_ERR(ifpack_err)
#define IFPACK_ABS(x)
Epetra_CrsMatrix * Ifpack_CreateOverlappingCrsMatrix(const Epetra_RowMatrix *Matrix, const int OverlappingLevel)
Creates an overlapping Epetra_CrsMatrix. Returns 0 if OverlappingLevel is 0.
long long NumGlobalRows64() const
long long NumGlobalNonzeros64() const
int Multiply(bool TransA, const Epetra_Vector &x, Epetra_Vector &y) const
const Epetra_Map & RowMatrixRowMap() const
int NumProc() const
int MyPID() const
int PutScalar(double ScalarConstant)
Ifpack_LocalFilter a class for light-weight extraction of the submatrix corresponding to local rows a...
Ifpack_OverlappingRowMatrix: matrix with ghost rows, based on Epetra_RowMatrix.
int ExportMultiVector(const Epetra_MultiVector &OvX, Epetra_MultiVector &X, Epetra_CombineMode CM=Add)
int ImportMultiVector(const Epetra_MultiVector &X, Epetra_MultiVector &OvX, Epetra_CombineMode CM=Insert)
virtual const Epetra_Map & RowMatrixRowMap() const
Returns the Epetra_Map object associated with the rows of this matrix.
virtual int Multiply(bool TransA, const Epetra_MultiVector &X, Epetra_MultiVector &Y) const
Returns the result of a Epetra_RowMatrix multiplied by a Epetra_MultiVector X in Y.
virtual long long NumGlobalNonzeros64() const
Returns the number of nonzero entries in the global matrix.
virtual long long NumGlobalRows64() const
Returns the number of global matrix rows.
int main(int argc, char *argv[])