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- Title
Design and evaluation of fine‐grain‐mode transition method based on dynamic memory access analysing for variable stages pipeline processor.
- Authors
Sasaki, Takahiro; Nakabayashi, Tomoyuki; Nomura, Kazumasa; Ohno, Kazuhiko; Kondo, Toshio
- Abstract
This study proposes a fine‐grain‐mode transition method for variable stages pipeline (VSP) processor. The method is based on dynamic memory access analysing and it reduces energy consumption. A VSP processor varies the pipeline depth dynamically according to workload. When the workload is heavy, the processor shifts into a high‐speed mode that drives a deep pipeline at a high clock frequency. When the workload is light, the processor shifts into a low‐energy mode that unifies pipeline stages to make the pipeline shallower and drives it at a low clock frequency. The conventional mode transition method cannot follow sharp workload changes because it takes a long time to predict workload. The fine‐grain pipeline depth control, this study proposes, is based on a high‐speed workload prediction mechanism using memory access frequency, and it uses a novel method to conceal the overhead because of changing the pipeline depth. Simulation results show that the authors approach can reduce the energy‐delay product 10% below what it would be with the conventional approach.
- Publication
IET Computers & Digital Techniques (Wiley-Blackwell), 2013, Vol 7, Issue 1, p41
- ISSN
1751-8601
- Publication type
Article
- DOI
10.1049/iet-cdt.2012.0067