Actual source code: ex300.c
2: static char help[] = "Show MatShift BUG happening after copying a matrix with no rows on a process";
3: /*
4: Contributed by: Eric Chamberland
5: */
6: #include <petscmat.h>
8: /* DEFINE this to turn on/off the bug: */
9: #define SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES
11: int main(int argc, char **args)
12: {
13: Mat C;
14: PetscInt i, m = 3;
15: PetscMPIInt rank, size;
16: PetscScalar v;
17: Mat lMatA;
18: PetscInt locallines;
19: PetscInt d_nnz[3] = {0, 0, 0};
20: PetscInt o_nnz[3] = {0, 0, 0};
22: PetscFunctionBeginUser;
23: PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
24: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
25: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
27: PetscCheck(2 == size, PETSC_COMM_WORLD, PETSC_ERR_ARG_INCOMP, "Relevant with 2 processes only");
28: PetscCall(MatCreate(PETSC_COMM_WORLD, &C));
30: #ifdef SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES
31: if (0 == rank) {
32: locallines = m;
33: d_nnz[0] = 1;
34: d_nnz[1] = 1;
35: d_nnz[2] = 1;
36: } else {
37: locallines = 0;
38: }
39: #else
40: if (0 == rank) {
41: locallines = m - 1;
42: d_nnz[0] = 1;
43: d_nnz[1] = 1;
44: } else {
45: locallines = 1;
46: d_nnz[0] = 1;
47: }
48: #endif
50: PetscCall(MatSetSizes(C, locallines, locallines, m, m));
51: PetscCall(MatSetFromOptions(C));
52: PetscCall(MatXAIJSetPreallocation(C, 1, d_nnz, o_nnz, NULL, NULL));
54: v = 2;
55: /* Assembly on the diagonal: */
56: for (i = 0; i < m; i++) PetscCall(MatSetValues(C, 1, &i, 1, &i, &v, ADD_VALUES));
57: PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY));
58: PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY));
59: PetscCall(MatSetOption(C, MAT_NEW_NONZERO_LOCATION_ERR, PETSC_TRUE));
60: PetscCall(MatSetOption(C, MAT_KEEP_NONZERO_PATTERN, PETSC_TRUE));
61: PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD));
62: PetscCall(MatConvert(C, MATSAME, MAT_INITIAL_MATRIX, &lMatA));
63: PetscCall(MatView(lMatA, PETSC_VIEWER_STDOUT_WORLD));
65: PetscCall(MatShift(lMatA, -1.0));
67: PetscCall(MatDestroy(&lMatA));
68: PetscCall(MatDestroy(&C));
69: PetscCall(PetscFinalize());
70: return 0;
71: }
73: /*TEST
75: test:
76: nsize: 2
78: TEST*/