Metrics to Evaluate Systems
Power Consumption Trends Dyn power α activity x capacitance x voltage2 x frequency Capacitance per transistor and voltage are decreasing, but number of transistors is increasing at a faster rate; hence clock frequency must be kept steady Leakage power is also rising; is a function of transistor count, leakage current, and supply voltage Power consumption is already between 100-150W in high-performance processors today Energy = power x time = (dynpower + lkgpower) x time Problem 1 For a processor running at 100% utilization at 100 W, 20% of the power is attributed to leakage. What is the total power dissipation when the processor is running at 50% utilization?