Poster 106: Optimizing Hybrid Access Virtual Memory System Using SCM/DRAM Unified Memory Management Unit

Authors: Yusuke Shirota (Toshiba Corporation), Shiyo Yoshimura (Toshiba Corporation), Satoshi Shirai (Toshiba Corporation), Tatsunori Kanai (Toshiba Corporation)

Abstract: In HPC systems, expectations for storage-class memory (SCM) are increasing in large-scale in-memory processing. While SCM can deliver higher capacity and lower standby power than DRAM, it is slower and the dynamic power is higher. Therefore, in order to realize high-speed, low-power and scalable main memory, it is necessary to build an SCM/DRAM unified memory, and dynamically optimize data placement between the two memories according to the memory access pattern.

In this poster, we describe a new hybrid access type virtual memory method using TLB-extended unified memory management unit which enables collecting and extracting fine-grained memory access locality characteristics. We show that with the proposed method, Hybrid Access control, which is a memory hierarchy control that selectively uses Direct Access to bus attached byte-addressable SCM and low power Aggressive Paging using small DRAM as cache, can be made more accurate, and the efficiency of memory access can be significantly improved.

Best Poster Finalist (BP): no

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