Group Scheduling for Improving Both CPU and Memory Power Efficiency Simultaneously

Improving power efficiency of processor and memory has recently received a lot of attention. However, most existing solutions concentrate on processor or memory separately and cannot combine well to simultaneously improve both. This paper presents a solution to improve both processor and memory power efficiency simultaneously through group scheduling (GS) which managing CPU frequency and memory rank according group. The main idea is to adopt the concept of group which contains thread group and memory rank group. Experimental results demonstrate our group scheduling is more power efficient than some state-of-the-art solutions both in CPU and memory. Furthermore, GS improves system performance while avoiding memory hotspot.