Actual source code: ex300.c
1: static char help[] = "Show MatShift BUG happening after copying a matrix with no rows on a process";
2: /*
3: Contributed by: Eric Chamberland
4: */
5: #include <petscmat.h>
7: /* DEFINE this to turn on/off the bug: */
8: #define SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES
10: int main(int argc, char **args)
11: {
12: Mat C;
13: PetscInt i, m = 3;
14: PetscMPIInt rank, size;
15: PetscScalar v;
16: Mat lMatA;
17: PetscInt locallines;
18: PetscInt d_nnz[3] = {0, 0, 0};
19: PetscInt o_nnz[3] = {0, 0, 0};
21: PetscFunctionBeginUser;
22: PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
23: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
24: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
26: PetscCheck(2 == size, PETSC_COMM_WORLD, PETSC_ERR_ARG_INCOMP, "Relevant with 2 processes only");
27: PetscCall(MatCreate(PETSC_COMM_WORLD, &C));
29: #ifdef SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES
30: if (0 == rank) {
31: locallines = m;
32: d_nnz[0] = 1;
33: d_nnz[1] = 1;
34: d_nnz[2] = 1;
35: } else {
36: locallines = 0;
37: }
38: #else
39: if (0 == rank) {
40: locallines = m - 1;
41: d_nnz[0] = 1;
42: d_nnz[1] = 1;
43: } else {
44: locallines = 1;
45: d_nnz[0] = 1;
46: }
47: #endif
49: PetscCall(MatSetSizes(C, locallines, locallines, m, m));
50: PetscCall(MatSetFromOptions(C));
51: PetscCall(MatXAIJSetPreallocation(C, 1, d_nnz, o_nnz, NULL, NULL));
53: v = 2;
54: /* Assembly on the diagonal: */
55: for (i = 0; i < m; i++) PetscCall(MatSetValues(C, 1, &i, 1, &i, &v, ADD_VALUES));
56: PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY));
57: PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY));
58: PetscCall(MatSetOption(C, MAT_NEW_NONZERO_LOCATION_ERR, PETSC_TRUE));
59: PetscCall(MatSetOption(C, MAT_KEEP_NONZERO_PATTERN, PETSC_TRUE));
60: PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD));
61: PetscCall(MatConvert(C, MATSAME, MAT_INITIAL_MATRIX, &lMatA));
62: PetscCall(MatView(lMatA, PETSC_VIEWER_STDOUT_WORLD));
64: PetscCall(MatShift(lMatA, -1.0));
66: PetscCall(MatDestroy(&lMatA));
67: PetscCall(MatDestroy(&C));
68: PetscCall(PetscFinalize());
69: return 0;
70: }
72: /*TEST
74: test:
75: nsize: 2
77: TEST*/