4. EVALUATION OF WEBSITES FOR ENERGY
SAVING
4.1 Rating the power consumption of websites
Based on the measurements of energy usage, we can classify
web contents into various levels of power consumption,
from the best energy-efficient rate 1 to the worst energyinefficient
rate 5. For this purpose, we define a power consumption
rating function R(P(i, j)) for power P(i, j) consumed
by content j of website i. In Eqn. 1, we have set
the threshold such that the worst grade (=5) begins at two
times the average power consumption value. We configured
the maximum value as the 99th percentile (22.62 W) to eliminate
the skewed distribution.