•Consider
the execution of a program on p processors - let the part q
(0<q<1) of each operation be parallelized. Maximum speedup
–spfalse = tk/tp = k/ [(q/p) +(1-q)]
–Indicates
the rapid loss of speedup if parallel fraction is not high enough
as p increases
–To
get 50% efficiency i.e. 256 on 512 q =0.998