Actual source code: ex2.c
2: static char help[] = "Tests application ordering.\n\n";
4: #include petscsys.h
5: #include petscao.h
9: int main(int argc,char **argv)
10: {
12: PetscMPIInt rank,size;
13: PetscInt n,*ispetsc,*isapp,start,N,i;
14: AO ao;
16: PetscInitialize(&argc,&argv,(char*)0,help);
17: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
18: MPI_Comm_rank(PETSC_COMM_WORLD,&rank); n = rank + 2;
19: MPI_Comm_size(PETSC_COMM_WORLD,&size);
21: /* create the orderings */
22: PetscMalloc2(n,PetscInt,&ispetsc,n,PetscInt,&isapp);
24: MPI_Scan(&n,&start,1,MPIU_INT,MPI_SUM,PETSC_COMM_WORLD);
25: MPI_Allreduce(&n,&N,1,MPIU_INT,MPI_SUM,PETSC_COMM_WORLD);
26: start -= n;
28: for (i=0; i<n; i++) {
29: ispetsc[i] = start + i;
30: isapp[i] = N - start - i - 1;
31: }
33: /* create the application ordering */
34: AOCreateBasic(PETSC_COMM_WORLD,n,isapp,ispetsc,&ao);
36: AOView(ao,PETSC_VIEWER_STDOUT_WORLD);
38: /* check the mapping */
39: AOPetscToApplication(ao,n,ispetsc);
40: for (i=0; i<n; i++) {
41: if (ispetsc[i] != isapp[i]) {
42: PetscPrintf(PETSC_COMM_WORLD,"[%d] Problem with mapping %D to %D\n",rank,i,ispetsc[i]);
43: }
44: }
45: PetscFree2(ispetsc,isapp);
47: AODestroy(ao);
48: PetscFinalize();
49: return 0;
50: }
51: