Actual source code: ex2.c
1: /*$Id: ex2.c,v 1.21 2001/04/10 19:37:18 bsmith Exp $*/
3: static char help[] = "Tests application ordering.\n\n";
5: #include petsc.h
6: #include petscao.h
10: int main(int argc,char **argv)
11: {
12: int n,ierr,rank,size,*ispetsc,*isapp,start,N,i;
13: AO ao;
15: PetscInitialize(&argc,&argv,(char*)0,help);
16: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
17: MPI_Comm_rank(PETSC_COMM_WORLD,&rank); n = rank + 2;
18: MPI_Comm_size(PETSC_COMM_WORLD,&size);
20: /* create the orderings */
21: PetscMalloc(2*n*sizeof(int),&ispetsc);
22: isapp = ispetsc + n;
24: MPI_Scan(&n,&start,1,MPI_INT,MPI_SUM,PETSC_COMM_WORLD);
25: MPI_Allreduce(&n,&N,1,MPI_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: fprintf(stdout,"[%d] Problem with mapping %d to %d\n",rank,i,ispetsc[i]);
43: }
44: }
46: PetscFree(ispetsc);
48: AODestroy(ao);
49: PetscFinalize();
50: return 0;
51: }
52: