Optimizing Capacitance and Switching Activity to Reduce Dynamic Power - Computer Architecture Techniques for Power-Efficiency - page 129

The sum is minimized, but this is not equivalent to finding the optimal global EDP.
This, in contrast, is done by selecting the j for each i with the intent of minimizing the
following product of sums :

MIN

n n

E ji t ji × .

i i

i = 1 i = 1

It is possible, therefore, for the two formulae above to have significantly different
solutions. The same can be shown for ED 2 P[ 198 ]. In contrast, energy can be safely
optimized with interval-based approaches using just local decisions [ 198 ].