1c4762a1bSJed Brown static char help[] = "Show MatShift BUG happening after copying a matrix with no rows on a process";
2c4762a1bSJed Brown /*
3c4762a1bSJed Brown Contributed by: Eric Chamberland
4c4762a1bSJed Brown */
5c4762a1bSJed Brown #include <petscmat.h>
6c4762a1bSJed Brown
7c4762a1bSJed Brown /* DEFINE this to turn on/off the bug: */
8c4762a1bSJed Brown #define SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES
9c4762a1bSJed Brown
main(int argc,char ** args)10d71ae5a4SJacob Faibussowitsch int main(int argc, char **args)
11d71ae5a4SJacob Faibussowitsch {
12c4762a1bSJed Brown Mat C;
13c4762a1bSJed Brown PetscInt i, m = 3;
14c4762a1bSJed Brown PetscMPIInt rank, size;
15c4762a1bSJed Brown PetscScalar v;
16c4762a1bSJed Brown Mat lMatA;
17c4762a1bSJed Brown PetscInt locallines;
18c4762a1bSJed Brown PetscInt d_nnz[3] = {0, 0, 0};
19c4762a1bSJed Brown PetscInt o_nnz[3] = {0, 0, 0};
20c4762a1bSJed Brown
21327415f7SBarry Smith PetscFunctionBeginUser;
22*c8025a54SPierre Jolivet PetscCall(PetscInitialize(&argc, &args, NULL, help));
239566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
249566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
25c4762a1bSJed Brown
2608401ef6SPierre Jolivet PetscCheck(2 == size, PETSC_COMM_WORLD, PETSC_ERR_ARG_INCOMP, "Relevant with 2 processes only");
279566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD, &C));
28c4762a1bSJed Brown
29c4762a1bSJed Brown #ifdef SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES
30c4762a1bSJed Brown if (0 == rank) {
31c4762a1bSJed Brown locallines = m;
32c4762a1bSJed Brown d_nnz[0] = 1;
33c4762a1bSJed Brown d_nnz[1] = 1;
34c4762a1bSJed Brown d_nnz[2] = 1;
35c4762a1bSJed Brown } else {
36c4762a1bSJed Brown locallines = 0;
37c4762a1bSJed Brown }
38c4762a1bSJed Brown #else
39c4762a1bSJed Brown if (0 == rank) {
40c4762a1bSJed Brown locallines = m - 1;
41c4762a1bSJed Brown d_nnz[0] = 1;
42c4762a1bSJed Brown d_nnz[1] = 1;
43c4762a1bSJed Brown } else {
44c4762a1bSJed Brown locallines = 1;
45c4762a1bSJed Brown d_nnz[0] = 1;
46c4762a1bSJed Brown }
47c4762a1bSJed Brown #endif
48c4762a1bSJed Brown
499566063dSJacob Faibussowitsch PetscCall(MatSetSizes(C, locallines, locallines, m, m));
509566063dSJacob Faibussowitsch PetscCall(MatSetFromOptions(C));
519566063dSJacob Faibussowitsch PetscCall(MatXAIJSetPreallocation(C, 1, d_nnz, o_nnz, NULL, NULL));
52c4762a1bSJed Brown
53c4762a1bSJed Brown v = 2;
54c4762a1bSJed Brown /* Assembly on the diagonal: */
5548a46eb9SPierre Jolivet for (i = 0; i < m; i++) PetscCall(MatSetValues(C, 1, &i, 1, &i, &v, ADD_VALUES));
569566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY));
579566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY));
589566063dSJacob Faibussowitsch PetscCall(MatSetOption(C, MAT_NEW_NONZERO_LOCATION_ERR, PETSC_TRUE));
599566063dSJacob Faibussowitsch PetscCall(MatSetOption(C, MAT_KEEP_NONZERO_PATTERN, PETSC_TRUE));
609566063dSJacob Faibussowitsch PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD));
619566063dSJacob Faibussowitsch PetscCall(MatConvert(C, MATSAME, MAT_INITIAL_MATRIX, &lMatA));
629566063dSJacob Faibussowitsch PetscCall(MatView(lMatA, PETSC_VIEWER_STDOUT_WORLD));
63c4762a1bSJed Brown
649566063dSJacob Faibussowitsch PetscCall(MatShift(lMatA, -1.0));
65c4762a1bSJed Brown
669566063dSJacob Faibussowitsch PetscCall(MatDestroy(&lMatA));
679566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C));
689566063dSJacob Faibussowitsch PetscCall(PetscFinalize());
69b122ec5aSJacob Faibussowitsch return 0;
70c4762a1bSJed Brown }
71c4762a1bSJed Brown
72c4762a1bSJed Brown /*TEST
73c4762a1bSJed Brown
74c4762a1bSJed Brown test:
75c4762a1bSJed Brown nsize: 2
76c4762a1bSJed Brown
77c4762a1bSJed Brown TEST*/
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