CPUAutoplug:动态变频与自动调核相结合的电源管理方法

CPUAutoplug:a Hybrid Power Management Method Combines Dynamic Frequency Scaling and Automatic Processor Core Plugging

随着技术的发展,性能不再是衡量计算机系统的首要指标,取而代之的是性能功耗比.电源管理是降低能耗,进而提升性能功耗比的重要途径.中央处理器（CPU）是计算机系统中的主要耗能部件,传统的运行时处理器电源管理方法主要是动态变频.在一些多核处理器平台上,各个核心的频率不能独立调节,因此动态变频方法不能很好地发挥节能效果,或是会造成性能损失.CPUAutoplug是一种以全局负载水平为调节依据,结合了动态变频和自动调核两种节能措施的电源管理方法.该方法能在基本不影响性能的情况下,取得比纯动态变频更好的节能效果.在龙芯3A的参考平台上,实验数据表明CPUAutoplug可带来高达16%~20%的节能幅度.

With the development of technology, not only performance, but the ratio of performance and power consumption, becomes the most important metric of computer system. Power management is an important approach of power-saving, so as to improve the ratio of performance and power. CPU is the first component of power consumption in computer, and dynamic frequency scaling is the main method of run-time processor power management. On some multi-core platform, frequencies of each core cannot be scaled inde- pendently. In this case, dynamic frequency scaling cannot get its optimal effect, or causes significant performance loss. CPUAutoplug based on global system load,is a hybrid approach which combines dynamic frequency scaling and automatic processor core plugging. CPUAutoplug can obtain better power-saving effect than pure dynamic frequency scaling, and without performance degradation. On Godson-3A reference platform,experiment results show that CPUAutoplug can reduce power consumption as much as 16% -20%.