dm: 
DM Object: 1 MPI process
  type: network
  NSubnets: 1; NEdges: 1; NVertices: 2; NSharedVertices: 0.
  [0] nEdges: 1; nVertices: 2; nSharedVertices: 0
     Subnet 0: nEdges 1, nVertices(include shared vertices) 2
       edge 0: 1 ----> 0
PetscSection Object: 1 MPI process
  type not yet set
Process 0:
  (   0) dof 1 offset   0
  (   1) dof 1 offset   1
  (   2) dof 1 offset   2

 dmclone: 
DM Object: 1 MPI process
  type: network
  NSubnets: 1; NEdges: 1; NVertices: 2; NSharedVertices: 0.
  [0] nEdges: 1; nVertices: 2; nSharedVertices: 0
     Subnet 0: nEdges 1, nVertices(include shared vertices) 2
       edge 0: 1 ----> 0
PetscSection Object: 1 MPI process
  type not yet set
Process 0:
  (   0) dof 2 offset   0
  (   1) dof 0 offset   2
  (   2) dof 0 offset   2

 dm vec:
Vec Object: 1 MPI process
  type: seq
  Edge 0:
    1.
  Vertex 0:
    1.
  Vertex 1:
    1.

 dmclone vec:
Vec Object: 1 MPI process
  type: seq
  Edge 0:
    2.
    2.