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: