Actual source code: ex251.c
1: static char help[] = "Test MatAXPY \n\n";
3: #include <petscmat.h>
4: int main(int argc, char **args)
5: {
6: Mat A = NULL, B = NULL;
7: PetscInt k;
8: const PetscInt M = 18, N = 18;
9: PetscMPIInt rank;
11: /* A, B are 18 x 18 nonsymmetric matrices. Initially, B's nonzero pattern is a subset of A.
12: Big enough to have complex communication patterns but still small enough for debugging.
13: */
14: PetscInt Ai[] = {0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17};
15: PetscInt Aj[] = {0, 1, 2, 7, 3, 8, 4, 9, 5, 8, 2, 6, 11, 0, 7, 1, 6, 2, 4, 10, 16, 11, 15, 12, 17, 12, 13, 14, 15, 17, 11, 13, 3, 16, 9, 15, 11, 13};
16: PetscInt Bi[] = {0, 0, 1, 1, 2, 2, 4, 4, 5, 5, 5, 6, 7, 7, 8, 8, 9, 9, 10, 10, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17};
17: PetscInt Bj[] = {0, 1, 2, 7, 3, 8, 5, 8, 2, 6, 11, 0, 1, 6, 2, 4, 10, 16, 11, 15, 12, 13, 14, 17, 11, 13, 3, 16, 9, 15, 11, 13};
19: PetscInt Annz = PETSC_STATIC_ARRAY_LENGTH(Ai);
20: PetscInt Bnnz = PETSC_STATIC_ARRAY_LENGTH(Bi);
22: PetscFunctionBeginUser;
23: PetscCall(PetscInitialize(&argc, &args, NULL, help));
24: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
26: PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
27: PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, M, N));
28: PetscCall(MatSetFromOptions(A));
29: PetscCall(MatSeqAIJSetPreallocation(A, 2, NULL));
30: PetscCall(MatMPIAIJSetPreallocation(A, 2, NULL, 2, NULL));
31: PetscCall(MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE));
33: if (rank == 0) {
34: for (k = 0; k < Annz; k++) PetscCall(MatSetValue(A, Ai[k], Aj[k], Ai[k] + Aj[k] + 1.0, INSERT_VALUES));
35: }
37: PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
38: PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
40: PetscCall(MatCreate(PETSC_COMM_WORLD, &B));
41: PetscCall(MatSetSizes(B, PETSC_DECIDE, PETSC_DECIDE, M, N));
42: PetscCall(MatSetFromOptions(B));
43: PetscCall(MatSeqAIJSetPreallocation(B, 2, NULL));
44: PetscCall(MatMPIAIJSetPreallocation(B, 2, NULL, 2, NULL));
45: PetscCall(MatSetOption(B, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE));
47: if (rank == 0) {
48: for (k = 0; k < Bnnz; k++) PetscCall(MatSetValue(B, Bi[k], Bj[k], Bi[k] + Bj[k] + 2.0, INSERT_VALUES));
49: }
50: PetscCall(MatAssemblyBegin(B, MAT_FINAL_ASSEMBLY));
51: PetscCall(MatAssemblyEnd(B, MAT_FINAL_ASSEMBLY));
53: PetscCall(MatAXPY(A, 1.0, B, SUBSET_NONZERO_PATTERN)); /* A += B */
54: PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD));
56: /* Blow up B so it will have the same nonzero pattern as A */
57: PetscCall(MatAXPY(B, 5, A, DIFFERENT_NONZERO_PATTERN)); /* B += 5A */
58: PetscCall(MatView(B, PETSC_VIEWER_STDOUT_WORLD));
60: PetscCall(MatAXPY(A, 3, B, SAME_NONZERO_PATTERN)); /* A += 7B */
61: PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD));
63: PetscCall(MatDestroy(&A));
64: PetscCall(MatDestroy(&B));
66: PetscCall(PetscFinalize());
67: return 0;
68: }
70: /*TEST
71: testset:
72: nsize: {{1 2}}
73: filter: grep -ve type -ve "Mat Object"
74: output_file: output/ex251_1.out
76: test:
77: suffix: 1
78: args: -mat_type aij
80: test:
81: suffix: cuda
82: requires: cuda
83: args: -mat_type aijcusparse
85: test:
86: suffix: kok
87: requires: kokkos_kernels
88: args: -mat_type aijkokkos
90: TEST*/