Test PrintCom:
Communication for vector v (after vector distribution):
  vol           : 1000 (2.5)
  avg = vol/P   : 125 (0.3125)
  max sent      : 250 (0.625)
  max recd      : 125 (0.3125)
Nr components for vector v (after vector distribution):
  avg           : 50 (0.125) 
  max           : 100 (0.25)
OK