1PetscSF Object: 1 MPI processes 2 type not yet set 3 PetscSFSetGraph() has not been called yet 4PetscSF Object: 1 MPI processes 5 type: basic 6 sort=rank-order 7 [0] Number of roots=0, leaves=0, remote ranks=0 8PetscSF Object: 1 MPI processes 9 type: basic 10 sort=rank-order 11 PetscSFSetGraph() has not been called yet 12PetscSF Object: 1 MPI processes 13 type: basic 14 sort=rank-order 15 [0] Number of roots=0, leaves=0, remote ranks=0 16