Abstract
Phase change memory (PCM) is a promising candidate to replace DRAM as main memory, thanks to its better scalability and lower static power than DRAM. However, PCM also presents a few drawbacks, such as long write latency and high write power. Moreover, the write commands parallelism of PCM is restricted by instantaneous power constraints, which degrades write bandwidth and overall performance. The write power of PCM is asymmetric: writing a zero consumes more power than writing a one. In this paper, we propose a new scheduling policy, write power asymmetry scheduling (WPAS), that exploits the asymmetry of write power. WPAS improveswrite commands parallelism of PCM memory without violating power constraint. The evaluation results show that WPAS can improve performance by up to 35.5%, and 18.5% on average. The effective read latency can be reduced by up to 33.0%, and 17.1% on average.
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QiWang is a PhD candidate in Institute of Acoustics, Chinese Academy of Sciences, China. Her research interests include VLSI design, computer architecture, and emerging memory technologies.
Donghui Wang received his BS from Tsinghua University, China in 1997. He received the PhD from Institute of Semiconductors, Chinese Academy of Sciences in 2002. Now, he is a professor of Institute of Acoustics, Chinese Academy of Sciences. His research interests include digital signal processor design, VLSI design and signal processing.
Chaohuan Hou received his BS from Peking University, China in 1958. He is a professor of Institute of Acoustics, Chinese Academy of Sciences, China. He was elected as a member of the Academic Division of Science and Technology, the Chinese Academy of Sciences in 1995. His research interests include VLSI signal processing, DSP design, and CPU design.
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Wang, Q., Wang, D. & Hou, C. Exploiting write power asymmetry to improve phase change memory system performance. Front. Comput. Sci. 9, 566–575 (2015). https://doi.org/10.1007/s11704-014-4185-4
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DOI: https://doi.org/10.1007/s11704-014-4185-4