AO Object: 3 MPI processes
  type: basic
Number of elements in ordering 9
PETSc->App  App->PETSc
  0    8      0    8
  1    7      1    7
  2    6      2    6
  3    5      3    5
  4    4      4    4
  5    3      5    3
  6    2      6    2
  7    1      7    1
  8    0      8    0