Evaluation of Variable Level Cache

Matsubara, Nobuyuki; Sasaki, Takahiro; Ohno, Kohei; Kondo, Takeshi

doi:10.1007/978-3-642-19853-3_33

Cited by 1 publication

(3 citation statements)

References 3 publications

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“…To solve the problem of DRI cache, we have proposed a VLC that improves DRI cache by reducing the penalty to write data back on resizing cache capacity [1], [11]. Our approach enables DRI technique to apply not only to a dedicated instruction cache but also to a data cache including unified L2 and/or L3 caches.…”

Section: Variable Level Cachementioning

confidence: 99%

“…In particular, the number of the extra access is increased when VLC executes a serious program that mainly has a low cache hit rate and occasionally gets a high cache hit rate because VLC operates in lower mode at that time. In ref [1], [2] the increase of extra accesses was not a problem because we estimated the energy consumption of VLC with a model for high leakage process according to previous trend. However, state-of-the-art CMOS device technologies reduce a ratio of leakage energy on a transistor contrary to the former prediction.…”

Section: B Problem Of the Previous Techniquementioning

confidence: 99%

“…In particular, the leakage energy consumed by a cache system is one major factor of energy consumption. Therefore, to reduce cache leakage energy without decrease in performance, we have proposed a variable level cache (VLC) [1], [2]. VLC dynamically resizes the cache size according to the required cache size from a running program.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reducing Dynamic Energy of Variable Level Cache

Watanabe¹,

Sasaki²,

Nakabayashi³

et al. 2013

IJCEE

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Abstract-Today, a high-performance and low-power processor is required. Even on an embedded processor, a large cache is implemented to achieve high performance, and leakage energy in such large cache has been increasing caused by scale down of semiconductor device. Therefore, reduction of cache leakage energy is very important. To reduce cache leakage energy, we propose a variable level cache (VLC) which reduces leakage energy with a little performance degradation. Generally, a required size of a cache depends on a program behavior. VLC dynamically estimates whether the current cache size is suitable for a running program, and if not VLC modifies its cache structure and cache hierarchy to change cache capacity. Since changing the cache construction and hierarchy incurs a large overhead, VLC adopts the low-overhead technique which reduces hierarchy changing overhead to prevent performance from degrading. However, previous VLC has a problem that dynamic energy consumption is increased because the technique needs many futile accesses. To solve the problem, this paper proposes the novel technique which reduces the number of the futile accesses to reduce dynamic energy consumption. According to our simulation results, the proposed VLC technique reduces 18% dynamic energy without performance degradation compared with the previous VLC.Index Terms-Low-power and high-performance cache, variable level cache, leakage energy, dynamic energy.

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Section: Variable Level Cachementioning

confidence: 99%

Section: B Problem Of the Previous Techniquementioning

confidence: 99%