Actual source code: ex2.c
2: static char help[] = "Tests application ordering.\n\n";
4: #include petsc.h
5: #include petscao.h
9: int main(int argc,char **argv)
10: {
11: int n,ierr,rank,size,*ispetsc,*isapp,start,N,i;
12: AO ao;
14: PetscInitialize(&argc,&argv,(char*)0,help);
15: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
16: MPI_Comm_rank(PETSC_COMM_WORLD,&rank); n = rank + 2;
17: MPI_Comm_size(PETSC_COMM_WORLD,&size);
19: /* create the orderings */
20: PetscMalloc(2*n*sizeof(int),&ispetsc);
21: isapp = ispetsc + n;
23: MPI_Scan(&n,&start,1,MPI_INT,MPI_SUM,PETSC_COMM_WORLD);
24: MPI_Allreduce(&n,&N,1,MPI_INT,MPI_SUM,PETSC_COMM_WORLD);
25: start -= n;
27: for (i=0; i<n; i++) {
28: ispetsc[i] = start + i;
29: isapp[i] = N - start - i - 1;
30: }
32: /* create the application ordering */
33: AOCreateBasic(PETSC_COMM_WORLD,n,isapp,ispetsc,&ao);
35: AOView(ao,PETSC_VIEWER_STDOUT_WORLD);
37: /* check the mapping */
38: AOPetscToApplication(ao,n,ispetsc);
39: for (i=0; i<n; i++) {
40: if (ispetsc[i] != isapp[i]) {
41: fprintf(stdout,"[%d] Problem with mapping %d to %d\n",rank,i,ispetsc[i]);
42: }
43: }
45: PetscFree(ispetsc);
47: AODestroy(ao);
48: PetscFinalize();
49: return 0;
50: }
51: