schedulingforreducedcpuenergy-展示頁
2024-08-01 17:01本頁面
【正文】 deadline ? Method 1 ? 50ms full speed。 energy consumption ? Cooperation of the operating system scheduler ? When to use full power amp。Scheduling for Reduced CPU Energy M. Weiser, B. Welch, A. Demers, and S. Shenker Introduction ? The Energy Saving of A Typical Laptop Computer ? Backlight and display amp。 Disk ? Turning off after a period of no use ? CPU ? Simple powerdownwhenidle techniques ? Another way? ? Opportunities ? Dynamically varying chip speed amp。 when not CPU Energy ? Q = C * V ? Charge = Capacitance * Volts ? E = Q * V ? Energy = Charge * Volts ? When charging a capacitor ? E =1/2 C V2 ? = Energy spent charging a gate is proprotional to the square of the voltage Reducing CPU Energy ? Empirically, lowervoltage circuits have longer settling times ? SGSThompson 8051 CMOS microcontroller ? 6 Mhz 5V ? MHz V ? 3 MHz V ? = max clock rate is proportional to voltage ? The relationship is close to linear for an interesting range of voltages 5V to ? Executing the same cycles at a lower voltage and a slower clock speed results in a power savings ? Adjust the CPU speed+voltage in response to scheduling demands An Energy Metric for CPUs ? MIPJ : Millions of instructions per joule ? = MIPS/WATTS ? No effect on changes in clock speed ? Opportunity For Quadra
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