PetscSF Object: Global-to-Natural SF 2 MPI processes
  type: basic
  [0] Number of roots=4, leaves=18, remote ranks=2
  [0] 0 <- (0,0)
  [0] 1 <- (0,1)
  [0] 2 <- (1,0)
  [0] 3 <- (1,1)
  [0] 4 <- (1,2)
  [0] 5 <- (1,3)
  [0] 6 <- (0,2)
  [0] 7 <- (0,3)
  [0] 8 <- (1,4)
  [0] 9 <- (1,5)
  [0] 10 <- (1,6)
  [0] 11 <- (1,7)
  [0] 12 <- (1,8)
  [0] 13 <- (1,9)
  [0] 14 <- (1,10)
  [0] 15 <- (1,11)
  [0] 16 <- (1,12)
  [0] 17 <- (1,13)
  [1] Number of roots=14, leaves=0, remote ranks=0
  MultiSF sort=rank-order
==== original V in global ordering. size==18	block size=2
Vec Object: V 2 MPI processes
  type: mpi
Process [0]
0.
0.
0.
0.5
Process [1]
0.5
0.
1.
0.
0.5
0.5
1.
0.5
0.
1.
0.5
1.
1.
1.
====  V in natural ordering. size==18	block size=2
Vec Object: NV 2 MPI processes
  type: mpi
Process [0]
0.
0.
0.5
0.
1.
0.
0.
0.5
0.5
0.5
1.
0.5
0.
1.
0.5
1.
1.
1.
Process [1]