Author: "Sang Lyul Min" / Database: Supplemental Index - Searchworks@Jio Institute Digital Library Search Results

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Author: Goos, Gerhard, Hartmanis, Juris, Leeuwen, Jan, Mueller, Frank, Bestavros, Azer, Sheayun Lee, Chang-Gun Lee, Minsuk Lee, Sang Lyul Min, and Chong Sang Kim
Abstract: In multi-tasking real-time systems, inter-task cache interference due to preemptions degrades system performance and predictability, complicating system design and analysis. To address this problem, we propose a novel scheduling scheme, called LPS (Limited Preemptible Scheduling), that limits preemptions to predetermined points with small cache-related preemption costs. We also give an accompanying analysis method that determines the schedulability of a given task set under LPS. By limiting preemption points, the proposed LPS scheme reduces preemption costs and thus increases the system throughput. Experimental results show that LPS can increase schedulable utilization by more than 10 % and save processor time by up to 44 % as compared with a traditional fully preemptible scheduling scheme. [ABSTRACT FROM AUTHOR]
Published: 1998
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Author: SUNG-KWAN KIM, HUNKI KWON, DONG-HEE LEE, SAM H. NOH, and SANG LYUL MIN
Subjects: CLUSTER set theory, ALGORITHMS, COMPUTER files, LINUX operating systems, LEGACY systems, MULTIMEDIA systems, STORAGE fragmentation (Computer science)
Abstract: As the multimedia handheld devices using NAND flash memory as storage media is becoming more popular, the importance of the flash file system is increasing. Although there has been substantial research on file systems dedicated to NAND flash memory, little attention has been paid to legacy file systems running on top of NAND flash memory. In this paper, we propose an anti-fragmentation cluster allocation (AFCA) scheme for the Linux Ext2 file system. For the proposed scheme, we re-define the concept of file system fragmentation that takes into account the characteristics of NAND flash memory. The proposed AFCA scheme tries to minimize the performance degradation resulting from the fragmentation problem by discriminately allocating free clusters to files depending on their size relative to the flash memory block size. Evaluation results show that compared to the original cluster allocation scheme in Ext2, the proposed AFCA scheme significantly reduces the file system fragmentation according to the new definition and improves the file system performance, especially the write performance, by up to 43%. [ABSTRACT FROM AUTHOR]
Published: 2009

Author: Seongjun Ahn, Jongmoo Choi, Donghee Lee, Noh, Sam H., Sang Lyul Min, and Yookun Cho
Subjects: FLASH memory, INTEGRATED circuits, INTERNETWORKING, COMPUTER files, COMPUTER storage devices
Abstract: Interoperability is an important requirement for portable storage devices that are increasingly being used to exchange and share data among diverse hosts. However, interoperability cannot be provided if different host systems use different file systems. To address this problem, we propose a storage device that contains a file system within itself, which we refer to as FSOC (File System On Chip). In this paper, we explain the design and implementation of a Flash memory-based FSOC as a proof-of-concept. We also propose a performance model for FSOC, which is derived by analyzing operations of the host and storage device. Using this model, we show that aside from qualitative benefits, there are quantitative benefits in using FSOC instead of a conventional storage device. Results from a series of experiments are given that compare the performance of a conventional storage device and the FSOC using synthetic workloads as well as real applications, which verifies the proposed model. [ABSTRACT FROM AUTHOR]
Published: 2007

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