Journal of KIISE:Software and Applications (한국정보과학회논문지:소프트웨어및응용)

Korean Institute of Information Scientists and Engineers (한국정보과학회)
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Effect of Garbage Collection in the ZG-machine

ZG-machine에서 기억 장소 재활용 체계의 영향

  • 우균 (동아대학교 전기전자컴퓨터공학부) ;
  • 한태숙 (한국과학기술원 전자전산학과)
  • Published : 2000.07.15
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Abstract

The ZG-machine is a space-efficient G-machine, which exploits a simple encoding method, called tag-forwarding, to compress the heap structure of graphs. Experiments on the ZG-machine without garbage collection shows that the ZG-machine saves 30% of heap space and the run-time overhead is no more than 6% than the G-machine. This paper presents the results of further experiments on the ZG-machine with the garbage collector. As a result, the heap-residency of the ZG-machine decreases by 34% on average although the run-time increases by 34% compared to the G-machine. The high rate of the run-time overhead of the ZG-machine is incurred by the garbage collector. However, when the heap size is 7 times the heap-residency, the run-time overhead of the ZG-machine is no more than 12% compared to the G-machine. With the aspect of reduced heap-residency, the ZG-machine may be useful in memory-restricted environments such as embedded systems. Also, with the development of a more efficient garbage collector, the run-time is expected to decrease significantly.

ZG-machine은 태그옮김이라는 간단한 부호화 기법을 채택한 공간 효율적인 G-machine이다. 기억 장소 재활용 체계 없이 실험한 이전 실험에서 ZG-machine은 G-machine과 비교하여 30%의 힙 공간을 절약할 수 있었고 수행 시간 부담은 6%를 넘지 않았었다. 이 논문에서는 ZG-machine에 기억 장소 재활용 체계를 장착하여 추가로 실험한 결과를 설명한다. 결과에 따르면, G-machine과 비교할 때, ZG-machine의 수행 시간은 34% 증가하였지만 최소 힙 사용량은 평균 34% 감소하였다. 수행 시간 부담이 커진 이유는 기억 장소 재활용 체계때문이다. 그러나 힙 공간을 최소 힙 사용량의 7 배 정도로 늘렸을 경우에 G-machine에 대한 수행 시간 부담은 12%를 넘지 않았다. ZG-machine에서 최소 힙 사용량이 줄어든 특성은 ZG-machine이 내장 체계와 같은 기억 장소가 제한된 응용 분야에 사용될 수 있음을 의미한다. 또한 보다 효율적인 기억 장소 재활용 쳬계를 개발함으로써 수행 시간은 상당히 줄어들 것으로 예상 된다.

Keywords

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