ATA-MQ: DRAM과 PCM을 사용하는 이기종 메모리 시스템에서의 메모리 접근 타입을 고려한 멀티 큐 알고리즘

학위논문 (석사)-- 서울대학교 대학원 : 컴퓨터공학부, 2016. 2. 엄현상.Phase change memory (PCM), compared to DRAM are being paid much attention to because of its lower power usage and greater capacity per unit. However due to their difference in characteristics, there are limita- tions when either is solely used. Therefore hybrid memory systems using a PCM and DRAM combination are being studied and are in process of de- velopment. Due to the characteristics of memory type, the page placement and migration algorithm is extremely important part of the entire system. In this paper, related studies are compared and analyzed and a new page mi- gration algorithmvirtues which includes reduction of the number of page migration, gaining benefits of energy and average access time by deciding pages hotness correctly and predicting future access patterns will be intro- duced. We have devised a new mechanism for effectively managing such hybrid memory systems, which places and migrates pages by deciding their Hotness correctly and predicting future access patterns. We have compared it with recently developed method that manages the hybrid memory sys- tems. We found that using of our approach reduces average access time and energy consumption approximately 40% compared with the Clock-DWF.Chaper 1 Introduction 1 Chaper 2 RelatedWork 4 2.1 MQ based algorithm 4 2.2 4Q algorithm 6 2.3 Clock based algorithm 7 Chaper 3 Motivation 9 Chaper 4 ATA-MQ:Access Type Aware - Multi-Queue 14 Chaper 5 Evaluation 19 5.1 The weight value 20 5.2 The migration threshold value 23 5.3 Compare with other algorithms 25 5.3.1 The number of page migrations 26 5.3.2 Performance comparison of the methods of determining the Hotness 27 5.4 Performance measure 30 Chaper 6 Conclusion 32 Chaper 7 Future work 33 References 34 초록 36Maste