Thanks for the replay,
but still..
my point is that for 291 min ( which is the time period we measure) 8 processors may spend no more than 2332.96 minutes in processing ( i.e 291 min * 8 processors)
How can we then claim that even the comulative CPU is 439177 sec (or 7319 min.)
It is much jigher than physically possible CPU time

Thanks
Boris