1 static char help[] = "Demonstrates constructing an application ordering.\n\n";
2
3 #include <petscao.h>
4 #include <petscviewer.h>
5
main(int argc,char ** argv)6 int main(int argc, char **argv)
7 {
8 PetscInt n = 5;
9 PetscMPIInt rank, size;
10 IS ispetsc, isapp;
11 AO ao;
12
13 PetscFunctionBeginUser;
14 PetscCall(PetscInitialize(&argc, &argv, NULL, help));
15 PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL));
16 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
17 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
18
19 /* create the index sets */
20 PetscCall(ISCreateStride(PETSC_COMM_WORLD, n, rank, size, &ispetsc));
21 PetscCall(ISCreateStride(PETSC_COMM_WORLD, n, n * rank, 1, &isapp));
22
23 /* create the application ordering */
24 PetscCall(AOCreateBasicIS(isapp, ispetsc, &ao));
25
26 PetscCall(AOView(ao, PETSC_VIEWER_STDOUT_WORLD));
27
28 PetscCall(ISView(ispetsc, PETSC_VIEWER_STDOUT_WORLD));
29 PetscCall(ISView(isapp, PETSC_VIEWER_STDOUT_WORLD));
30 PetscCall(AOPetscToApplicationIS(ao, ispetsc));
31 PetscCall(ISView(isapp, PETSC_VIEWER_STDOUT_WORLD));
32 PetscCall(ISView(ispetsc, PETSC_VIEWER_STDOUT_WORLD));
33
34 PetscCall(ISDestroy(&ispetsc));
35 PetscCall(ISDestroy(&isapp));
36
37 PetscCall(AODestroy(&ao));
38 PetscCall(PetscFinalize());
39 return 0;
40 }
41
42 /*TEST
43
44 test:
45 nsize: 2
46
47 TEST*/
48