1 static char help[] = "Tests the use of MatZeroRows() for parallel matrices.\n\
2 This example also tests the use of MatDuplicate() for both MPIAIJ and MPIBAIJ matrices";
3
4 #include <petscmat.h>
5
6 extern PetscErrorCode TestMatZeroRows_Basic(Mat, IS, PetscScalar);
7 extern PetscErrorCode TestMatZeroRows_with_no_allocation(Mat, IS, PetscScalar);
8
main(int argc,char ** args)9 int main(int argc, char **args)
10 {
11 Mat A;
12 PetscInt i, j, m = 3, n, Ii, J, Imax;
13 PetscMPIInt rank, size;
14 PetscScalar v, diag = -4.0;
15 IS is;
16
17 PetscFunctionBeginUser;
18 PetscCall(PetscInitialize(&argc, &args, NULL, help));
19 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
20 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
21 n = 2 * size;
22
23 /* create A Square matrix for the five point stencil,YET AGAIN*/
24 PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
25 PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n));
26 PetscCall(MatSetFromOptions(A));
27 PetscCall(MatSetUp(A));
28 for (i = 0; i < m; i++) {
29 for (j = 2 * rank; j < 2 * rank + 2; j++) {
30 v = -1.0;
31 Ii = j + n * i;
32 if (i > 0) {
33 J = Ii - n;
34 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES));
35 }
36 if (i < m - 1) {
37 J = Ii + n;
38 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES));
39 }
40 if (j > 0) {
41 J = Ii - 1;
42 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES));
43 }
44 if (j < n - 1) {
45 J = Ii + 1;
46 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES));
47 }
48 v = 4.0;
49 PetscCall(MatSetValues(A, 1, &Ii, 1, &Ii, &v, INSERT_VALUES));
50 }
51 }
52 PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
53 PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
54
55 /* Create AN IS required by MatZeroRows() */
56 Imax = n * rank;
57 if (Imax >= n * m - m - 1) Imax = m * n - m - 1;
58 PetscCall(ISCreateStride(PETSC_COMM_SELF, m, Imax, 1, &is));
59
60 PetscCall(TestMatZeroRows_Basic(A, is, 0.0));
61 PetscCall(TestMatZeroRows_Basic(A, is, diag));
62
63 PetscCall(TestMatZeroRows_with_no_allocation(A, is, 0.0));
64 PetscCall(TestMatZeroRows_with_no_allocation(A, is, diag));
65
66 PetscCall(MatDestroy(&A));
67
68 /* Now Create a rectangular matrix with five point stencil (app)
69 n+size is used so that this dimension is always divisible by size.
70 This way, we can always use bs = size for any number of procs */
71 PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
72 PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, m * n, m * (n + size)));
73 PetscCall(MatSetFromOptions(A));
74 PetscCall(MatSetUp(A));
75 for (i = 0; i < m; i++) {
76 for (j = 2 * rank; j < 2 * rank + 2; j++) {
77 v = -1.0;
78 Ii = j + n * i;
79 if (i > 0) {
80 J = Ii - n;
81 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES));
82 }
83 if (i < m - 1) {
84 J = Ii + n;
85 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES));
86 }
87 if (j > 0) {
88 J = Ii - 1;
89 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES));
90 }
91 if (j < n + size - 1) {
92 J = Ii + 1;
93 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES));
94 }
95 v = 4.0;
96 PetscCall(MatSetValues(A, 1, &Ii, 1, &Ii, &v, INSERT_VALUES));
97 }
98 }
99 PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
100 PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
101
102 PetscCall(TestMatZeroRows_Basic(A, is, 0.0));
103 PetscCall(TestMatZeroRows_Basic(A, is, diag));
104
105 PetscCall(MatDestroy(&A));
106 PetscCall(ISDestroy(&is));
107 PetscCall(PetscFinalize());
108 return 0;
109 }
110
TestMatZeroRows_Basic(Mat A,IS is,PetscScalar diag)111 PetscErrorCode TestMatZeroRows_Basic(Mat A, IS is, PetscScalar diag)
112 {
113 Mat B;
114 PetscBool keepnonzeropattern;
115
116 /* Now copy A into B, and test it with MatZeroRows() */
117 PetscFunctionBeginUser;
118 PetscCall(MatDuplicate(A, MAT_COPY_VALUES, &B));
119
120 PetscCall(PetscOptionsHasName(NULL, NULL, "-keep_nonzero_pattern", &keepnonzeropattern));
121 if (keepnonzeropattern) PetscCall(MatSetOption(B, MAT_KEEP_NONZERO_PATTERN, PETSC_TRUE));
122
123 PetscCall(MatZeroRowsIS(B, is, diag, 0, 0));
124 PetscCall(MatView(B, PETSC_VIEWER_STDOUT_WORLD));
125 PetscCall(MatDestroy(&B));
126 PetscFunctionReturn(PETSC_SUCCESS);
127 }
128
TestMatZeroRows_with_no_allocation(Mat A,IS is,PetscScalar diag)129 PetscErrorCode TestMatZeroRows_with_no_allocation(Mat A, IS is, PetscScalar diag)
130 {
131 Mat B;
132
133 /* Now copy A into B, and test it with MatZeroRows() */
134 PetscFunctionBeginUser;
135 PetscCall(MatDuplicate(A, MAT_COPY_VALUES, &B));
136 /* Set this flag after assembly. This way, it affects only MatZeroRows() */
137 PetscCall(MatSetOption(B, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_TRUE));
138
139 PetscCall(MatZeroRowsIS(B, is, diag, 0, 0));
140 PetscCall(MatView(B, PETSC_VIEWER_STDOUT_WORLD));
141 PetscCall(MatDestroy(&B));
142 PetscFunctionReturn(PETSC_SUCCESS);
143 }
144
145 /*TEST
146
147 test:
148 nsize: 2
149 filter: grep -v " MPI process"
150
151 test:
152 suffix: 2
153 nsize: 3
154 args: -mat_type mpibaij -mat_block_size 3
155 filter: grep -v " MPI process"
156
157 test:
158 suffix: 3
159 nsize: 3
160 args: -mat_type mpiaij -keep_nonzero_pattern
161 filter: grep -v " MPI process"
162
163 test:
164 suffix: 4
165 nsize: 3
166 args: -keep_nonzero_pattern -mat_type mpibaij -mat_block_size 3
167 filter: grep -v " MPI process"
168
169 test:
170 requires: !defined(PETSC_HAVE_THREADSAFETY)
171 suffix: 5
172 nsize: 3
173 args: -mat_type mpibaij -mat_block_size 3 -mat_view
174 filter: grep -v " MPI process"
175
176 TEST*/
177