Actual source code: ex12.c
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";
4: #include <petscmat.h>
6: extern PetscErrorCode TestMatZeroRows_Basic(Mat, IS, PetscScalar);
7: extern PetscErrorCode TestMatZeroRows_with_no_allocation(Mat, IS, PetscScalar);
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;
17: PetscFunctionBeginUser;
18: PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
19: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
20: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
21: n = 2 * size;
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));
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));
60: PetscCall(TestMatZeroRows_Basic(A, is, 0.0));
61: PetscCall(TestMatZeroRows_Basic(A, is, diag));
63: PetscCall(TestMatZeroRows_with_no_allocation(A, is, 0.0));
64: PetscCall(TestMatZeroRows_with_no_allocation(A, is, diag));
66: PetscCall(MatDestroy(&A));
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));
102: PetscCall(TestMatZeroRows_Basic(A, is, 0.0));
103: PetscCall(TestMatZeroRows_Basic(A, is, diag));
105: PetscCall(MatDestroy(&A));
106: PetscCall(ISDestroy(&is));
107: PetscCall(PetscFinalize());
108: return 0;
109: }
111: PetscErrorCode TestMatZeroRows_Basic(Mat A, IS is, PetscScalar diag)
112: {
113: Mat B;
114: PetscBool keepnonzeropattern;
116: /* Now copy A into B, and test it with MatZeroRows() */
117: PetscFunctionBeginUser;
118: PetscCall(MatDuplicate(A, MAT_COPY_VALUES, &B));
120: PetscCall(PetscOptionsHasName(NULL, NULL, "-keep_nonzero_pattern", &keepnonzeropattern));
121: if (keepnonzeropattern) PetscCall(MatSetOption(B, MAT_KEEP_NONZERO_PATTERN, PETSC_TRUE));
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: }
129: PetscErrorCode TestMatZeroRows_with_no_allocation(Mat A, IS is, PetscScalar diag)
130: {
131: Mat B;
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));
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: }
145: /*TEST
147: test:
148: nsize: 2
149: filter: grep -v " MPI process"
151: test:
152: suffix: 2
153: nsize: 3
154: args: -mat_type mpibaij -mat_block_size 3
155: filter: grep -v " MPI process"
157: test:
158: suffix: 3
159: nsize: 3
160: args: -mat_type mpiaij -keep_nonzero_pattern
161: filter: grep -v " MPI process"
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"
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"
176: TEST*/