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.nn";
5: #include petsc.h
6: #include petscao.h
8: int main(int argc,char **argv)
9: {
10: int n,ierr,rank,size,*ispetsc,*isapp,start,N,i;
11: AO ao;
13: PetscInitialize(&argc,&argv,(char*)0,help);
14: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
15: MPI_Comm_rank(PETSC_COMM_WORLD,&rank); n = rank + 2;
16: MPI_Comm_size(PETSC_COMM_WORLD,&size);
18: /* create the orderings */
19: PetscMalloc(2*n*sizeof(int),&ispetsc);
20: isapp = ispetsc + n;
22: MPI_Scan(&n,&start,1,MPI_INT,MPI_SUM,PETSC_COMM_WORLD);
23: MPI_Allreduce(&n,&N,1,MPI_INT,MPI_SUM,PETSC_COMM_WORLD);
24: start -= n;
26: for (i=0; i<n; i++) {
27: ispetsc[i] = start + i;
28: isapp[i] = N - start - i - 1;
29: }
31: /* create the application ordering */
32: AOCreateBasic(PETSC_COMM_WORLD,n,isapp,ispetsc,&ao);
34: AOView(ao,PETSC_VIEWER_STDOUT_WORLD);
36: /* check the mapping */
37: AOPetscToApplication(ao,n,ispetsc);
38: for (i=0; i<n; i++) {
39: if (ispetsc[i] != isapp[i]) {
40: fprintf(stdout,"[%d] Problem with mapping %d to %dn",rank,i,ispetsc[i]);
41: }
42: }
44: PetscFree(ispetsc);
46: AODestroy(ao);
47: PetscFinalize();
48: return 0;
49: }
50: