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Empirical Analysis of Disaggregated Cloud Memory on Memory Intensive Applications
Yeonwoo Jeong,Gyeonghwan Jung,Kyuli Park,Youngjae Kim,Sungyong Park 대한전자공학회 2023 Journal of semiconductor technology and science Vol.23 No.5
Disaggregated Cloud Memory (DCM) is a hypervisor-based solution that allows client node to extend local memory by leveraging underutilized memory from remote node. These two nodes are generally connected through Remote Direct Memory Access (RDMA)-based high-bandwidth InfiniBand networks. DCM has been a viable alternative to mitigate the performance degradation of memory-intensive applications in memory-constrained environments. There has also been a growing interest in developing memory-intensive applications with managed languages (we call managed applications) such as Java and Python. These managed languages are easy to use but introduce unpredictability in memory usage at runtime. Despite the advantage of memory extension in DCM, the empirical studies that analyze the performance impact and overhead of running managed applications in DCM are lacking. This paper presents the results of a comprehensive study of DCM on both managed and unmanaged applications. The experimental results revealed that the performance degradation of unmanaged applications in DCM is only less than 6% due to fast remote paging and optimized page eviction policy. However, Garbage Collection (GC) severely degrades the performance of managed applications when page fault occurs, while DCM mitigates the performance degradation efficiently.
교각운동이 월경곤란증으로 인한 허리통증을 가진 여대생에게 미치는 영향
정연우 ( Jeong Yeonwoo ),홍상현 ( Hong Sanghyeon ),이승협 ( Lee Seunghyub ) 대한통합의학회 2016 대한통합의학회지 Vol.4 No.4
Purpose : This study determines the effect and sustainability of the trunk stability exercise program, specifically using the bridge exercise, by measuring Visual Analogue Scale(VAS), Menstrual Distress Questionaire(MDQ) and muscle strength in women university students complaining of low back pain. Methods : The trunk stability exercise program was progressed by 22 women university students, for 4 weeks, (3 times a week, 1 hour per session). At this time, low back pain happened at the period of menstruation and was measured using VAS, Dysmenorrhea using the MDQ tool and abdominal and back muscle strength using HUR. This study was evaluated 4 times (before and after the exercise program, after 4 weeks and 8 weeks) to investigate the effect of time variation after the exercise program. Results : The trends showed a decrease in VAS and MDQ and an increase in abdominal and back muscle strength. Therefore, these results were evaluated positively from a statistical perspective(p<.05). Conclusions : The trunk stability exercise results in a decreased VAS and MDQ, and increases the muscle strength in women university students who complained of low back pain form dysmenorrhea. Therefore, the low back pain from dysmenorrhea could have been avoided and quality of everyday life improved.