Empirical Study for Optimization of Power-Performance with On-Chip Memory
Identifieur interne : 000C41 ( Main/Exploration ); précédent : 000C40; suivant : 000C42Empirical Study for Optimization of Power-Performance with On-Chip Memory
Auteurs : Chikafumi Takahashi [Japon] ; Mitsuhisa Sato [Japon] ; Daisuke Takahashi [Japon] ; Taisuke Boku [Japon] ; Hiroshi Nakamura [Japon] ; Masaaki Kondo [Japon] ; Motonobu Fujita [Japon]Source :
- Lecture Notes in Computer Science [ 0302-9743 ] ; 2008.
Abstract
Abstract: Power-performance (performance per uniform power consumption) recently has become a more important factor in modern high-performance microprocessors. In processor design, it is a well-known that off-chip memory access has a large impact on both performance and power consumption. On-chip memory is one solution for this problem, so that many processors such as the Renesas SH-4 and some ARM architecture type processors adopt on-chip memory, which resides on the same layer as the cache memory. In this study, the effectiveness of the on-chip memory in an SH-4 processor was quantitatively examined by directly measuring the real power of the processor. For these experiments, we proposed a method that made use of the on-chip memory for power reduction. The experimental results show that the optimization of data transfer using on-chip memory reduces EDP(energy delay product) by up to 15.2%. As an extension of on-chip memory, we have proposed an on-chip RAM architecture called SCIMA (software controllable integrated memory architecture) which enables DMA (direct memory access) transfer to the on-chip memory. According to the empirical data from the SH-4 processor, it was found that the additional DMA transfer using SCIMA reduces EDP by up to 26.3%.
Url:
DOI: 10.1007/978-3-540-77704-5_44
Affiliations:
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<front><div type="abstract" xml:lang="en">Abstract: Power-performance (performance per uniform power consumption) recently has become a more important factor in modern high-performance microprocessors. In processor design, it is a well-known that off-chip memory access has a large impact on both performance and power consumption. On-chip memory is one solution for this problem, so that many processors such as the Renesas SH-4 and some ARM architecture type processors adopt on-chip memory, which resides on the same layer as the cache memory. In this study, the effectiveness of the on-chip memory in an SH-4 processor was quantitatively examined by directly measuring the real power of the processor. For these experiments, we proposed a method that made use of the on-chip memory for power reduction. The experimental results show that the optimization of data transfer using on-chip memory reduces EDP(energy delay product) by up to 15.2%. As an extension of on-chip memory, we have proposed an on-chip RAM architecture called SCIMA (software controllable integrated memory architecture) which enables DMA (direct memory access) transfer to the on-chip memory. According to the empirical data from the SH-4 processor, it was found that the additional DMA transfer using SCIMA reduces EDP by up to 26.3%.</div>
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