Machine (P#0 Backend=Linux)
  PU L#0 (P#0)
  PU L#1 (P#1)
  PU L#2 (P#2)
  PU L#3 (P#3)
depth 0:	1 Machine (type #1)
 depth 1:	4 PU (type #6)
Topology not from this system