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