PM ??? DRAM ??????????????? ????????? ???????????? ?????? ?????? ????????? ??? ????????? ????????? ????????? ?????? ??????

Department of Computer Science and EngineeringThe emergence of persistent memory (PM), which has characteristics of similar to DRAM at much lower cost, is now being deployed in real systems. By configuring systems in hybrid form, with both PM and DRAM, demands for high memory capacity can be cost-effectively satisfied. However, if memory management is not done judiciously, it can have detrimental effects on performance. Hence, the negative characteristics of PM such as latency and bandwidth limitations that differ from DRAM have required researchers to study judicious use policies to improve system-wide efficiency. Such policies become especially important when PM is applied to NUMA (Non-Uniform Memory Access) systems where PM performance becomes even more sensitive and different from DRAM according to local and remote accesses. Previous studies have referred to this memory environment as a tiered memory environment, and recent studies have been conducted to optimize the performance in this environment. While early results have proposed ways to optimize performance in hybrid tiered memory environments, in this thesis, we consider the effect of multithreading and concurrency level, which to the best of our knowledge, have not been considered elsewhere. We implement the MCAM policy, which is a multithreading and concurrency aware policy. As a result of testing the performance of the PM distribution system by applying the newly implemented MCAM policy, 38% improvement was obtained compared to the policy of the existing system.ope