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: