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An energy-efficient scheduling algorithm for sporadic real-time tasks in multiprocessor systems

An energy-efficient scheduling algorithm for sporadic real-t...

引用

13th IEEE International Workshop on FTDCS 2011, the 8th International Conference on ATC 2011, the 8th International Conference on UIC 2011 and the 13th IEEE International Conference on HPCC 2011

作者： Zhang, Dong-Song Chen, Fang-Yuan Li, Hong-Hua Jin, Shi-Yao Guo, De-Ke National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha 410073 China School of Computing Science Simon Fraser University 8888 University Drive Burnaby BC V5A 1S6 Canada National Laboratory for Information System Engineering School of Information Systems and Management National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9780769545387

As the energy consumption of embedded multiprocessor systems becomes increasingly prominent, the real-time energy-efficient scheduling in multiprocessor systems becomes an urgent problem to reduce the system energy consumption while meeting real-time constraints. For a multiprocessor with independent DVFS and DPM at each processor, this paper proposes an energy-efficient real-time scheduling algorithm named LRE-DVFS-EACH, based on LRE-TL which is an optimal real-time scheduling algorithm for sporadic tasks. LRE-DVFS-EACH utilizes the concept of TL plane and the idea of fluid scheduling to dynamically scale the voltage and frequency of processors at the initial time of each TL plane as well as the release time of a sporadic task in each TL plane. Consequently, LRE-DVFS-EACH can obtain a reasonable tradeoff between the real-time constraints and the energy saving. LRE-DVFS-EACH is also adaptive to the change of workload caused by the dynamic release of sporadic tasks, which can obtain more energy savings. The experimental results show that compared with existing algorithms, LRE-DVFS-EACH can not only guarantee the optimal feasibility of sporadic tasks, but also achieve more energy savings in all cases, especially in the case of high workloads. © 2011 IEEE.

关键词： Real time systems

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An Energy-Efficient Scheduling Algorithm for Sporadic Real-Time Tasks in Multiprocessor systems

An Energy-Efficient Scheduling Algorithm for Sporadic Real-T...

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IEEE International Conference on High Performance Computing and Communications (HPCC)

作者： Dong-Song Zhang Fang-Yuan Chen Hong-Hua Li Shi-Yao Jin De-Ke Guo National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha China School of Computing Science Simon Fraser University Burnaby BC Canada National Laboratory for Information System Engineering School of Information Systems and Management National University of Defense Technology Changsha China

关键词： Real time systems Scheduling algorithm Time frequency analysis Scheduling Heuristic algorithms Power demand

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A continuous stream service and high service availability mechanism for continuous media servers

A continuous stream service and high service availability me...

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6th International Conference on Advanced Communication Technology: Broadband Convergence Network Infrastructure

作者： Jung, Sung-In Lee, Cheol-Hoon Computer System Division Electron./Telecom. Res. Institute Daejon Korea Republic of Parallel Processing Laboratory Department of Computer Engineering Chungnam National University Daejon Korea Republic of

ISBN: (纸本)8955191197

Due to the explosive growth of the Internet, stream services are becoming more popular. The large media servers supporting thousands of concurrent media streams have to satisfy us with both good throughout and high availability. Although they are reciprocal from the viewpoint of system performance, the stream service continuity, as well as throughput, should be considered in clustered media servers. This is because media stream services should be continuously available to the clients even on the event of system failure. In this paper, we introduce service availability as the gauge of service degree on media servers, and present the basic scheme for guaranteeing continuous stream service. To do this, we propose LSS(Log Stream Status) and RRD(Ready Resource for instant Delivery) mechanisms. They are classified according to the status management method of stream service and the resumption method of closed service. Although these mechanisms require additional overhead, we found that they can be applied to clustered media servers with minimum overhead. Additionally, we concluded that they can provide higher quality of service availability on traditional clustered media servers.

关键词： Servers

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Improved fuzzy clustering for identification of Takagi-Sugeno model

Improved fuzzy clustering for identification of Takagi-Sugen...

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International IEEE Conference on Intelligent systems, IS

作者： K.M. Alexiev O.I. Georgieva Central laboratory for parallel Processing Bulgarian Academy of Sciences Sofia Bulgaria Institute of Control and System Research Bulgarian Academy of Sciences Sofia Bulgaria

The paper deals with the Takagi-Sugeno fuzzy modeling approach improved with procedure for cluster initialization. Takagi-Sugeno approach decomposes the input-output data space into subspaces and then approximates the system in each subspace. A powerful method for subsystem determination is fuzzy clustering. The main drawback of the fuzzy clustering algorithms is the lack of initialization procedure. There is no reliable technique for determining the number of clusters and initial data partition in order to avoid the local minima in solving the clustering task. In this paper a Hough transform initiation procedure for finding the number of clusters and a good starting point in the clustering optimization procedure is implemented. In this way the efficiency of overall estimation procedure is increased and the accuracy of the obtained model is improved.

关键词： Takagi-Sugeno model Fuzzy systems Clustering algorithms Partitioning algorithms Power system modeling Power system reliability Time varying systems Least squares approximation Parameter estimation Least squares methods

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A continuous stream service and high service availability mechanism for continuous media servers

A continuous stream service and high service availability me...

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International Conference on Advanced Communication Technology (ICACT)

作者： Sung-In Jung Cheol-Hoon Lee Computer System Division Electronics and Telecommunications Research Institute Daejeon South Korea Parallel Processing Laboratory Department of Computer Engineering Chungnam National University Daejeon South Korea

ISBN: (纸本)8955191197

关键词： Availability Streaming media Web server Concurrent computing Telecommunication computing Quality of service Network servers Monitoring parallel processing Laboratories

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A selectively accessing TLB for high performance and lower power consumption 3

A selectively accessing TLB for high performance and lower p...

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3rd IEEE Asia-Pacific Conference on ASIC, AP-ASIC 2002

作者： Min, Jung-Hi Lee, Jung-Hoon Jeong, Seh-Woong Kim, Shin-Dug Parallel Processing Laboratory Dept. of Computer Science Yonsei University Seoul120-749 Korea Republic of Media SOC Team System LSI Business Samsung Electronics Co. Ltd. Kihueng Korea Republic of

ISBN: (纸本)0780373634

This paper presents a structure of TLB (translation lookaside buffer) for low power consumption but high performance. The proposed TLB is constructed as a combination of one block buffer and two-way banked TLBs. The processor can access the block buffer or one of two banked TLBs selectively. This feature is quite different from that used in the traditional block buffering technique. Simulation results show its effectiveness in terms of power consumption and energy∗delay product. The proposed TLB can reduce power consumptions by about 40%, 10%, 23%, and 23%, compared with a FA (fully associative)-TLB, a micro-TLB, a victim-TLB, and a banked-TLB respectively. Also the proposed TLB can reduce Energy∗Delay products by about 38%, 28%, 21%, and 21%, compared with a FA-TLB, a micro-TLB, a victim-TLB, and a banked-TLB respectively. Therefore the proposed TLB can achieve low power consumption and high performance with a simple architecture. © 2002 IEEE.

关键词： Electric power utilization

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A selective temporal and aggressive spatial cache system based on time interval

A selective temporal and aggressive spatial cache system bas...

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IEEE International Conference on Computer Design: VLSI in Computers and Processors, (ICCD)

作者： Jung Hoon Lee Jang-Soo Lee Shin-Dug Kim Dept. of Comput. Sci. Yonsei Univ. Seoul South Korea Department of Computer Science Parallel Processing System Laboratory Yonsei University Seoul South Korea

This paper proposes a new cache system that can increase the effect by temporal and spatial locality by using only simple hardware control without any locality detection hardware or compiler aid. The proposed cache system consists of two caches with different associativities and different block sizes, i.e., a direct-mapped cache with small block size and a fully associative spatial buffer with large block size as a multiple of small blocks. Therefore, the spatial locality can be exploited by aggressively fetching large blocks including any missed small block into the buffer, and the temporal locality can also be exploited by selectively storing small blocks that were referenced at the spatial buffer in the past. To determine the blocks to be stored at the direct-mapped cache, the proposed cache system uses a time interval-based selection mechanism. According to the simulation results, similar performance can be achieved by using four times smaller cache size compared with the conventional direct-mapped cache.

关键词： Buffer storage Hardware parallel processing Laboratories Computer science Control systems Computational modeling Cache memory Delay Energy consumption

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A selective compressed memory system by on-line data decompressing

A selective compressed memory system by on-line data decompr...

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25th EUROMICRO Conference on Informatics: Theory and Practice for the New Millennium, EUROMICRO 1999

作者： Lee, Jang-Soo Hong, Won-Kee Kim, Shin-Dug Parallel Processing System Laboratory Department of Computer Science Yonsei University 134 Shinchon-Dong Seodaemun-Ku Seoul 120-749 Korea Republic of

ISBN: (纸本)0769503217

The article proposes a selective compressed memory system (SCMS) focusing on a compressed cache architecture, in which only data blocks with good compression efficiency are compressed selectively and all compressed blocks are stored in a fixed memory space. The selective compression technique can reduce decompression overhead caused by online data decompression and also the fixed memory space allocation allows efficient management of the compressed blocks. The results from a trace driven simulation show that the SCMS approach can provide around a 35% decrease in the on-chip cache miss ratio as well as a 53% decrease in the data traffic over conventional memory systems. Furthermore, a large amount of the decompression overhead can be reduced, and thus the average memory access time can also be reduced by a maximum 20% against conventional memory systems. © 1999 IEEE.

关键词： Cost reduction

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A selective compressed memory system by on-line data decompressing

A selective compressed memory system by on-line data decompr...

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EUROMICRO Conference

作者： Jang-Soo Lee Won-Kee Hong Shin-Dug Kim Parallel Processing System Laboratory Department of Computer Science Yonsei University Seoul South Korea

关键词： Cache memory Bandwidth parallel processing Laboratories Computer science Memory management Hip Delay Process design Bridges

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Design and evaluation of a selective compressed memory system

Design and evaluation of a selective compressed memory syste...

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IEEE International Conference on Computer Design: VLSI in Computers and Processors, (ICCD)

作者： Jang-Soo Lee Won-Kee Hong Shin-Dug Kim Department of Computer Science Parallel Processing System Laboratory Yonsei University Seoul South Korea

This research explores any potential for an on-chip cache compression which can reduce not only cache miss ratio but also miss penalty, if main memory is also managed in compressed form. However, the decompression time causes a critical effect on the memory access time and variable-sized compressed blocks tend to increase the design complexity of the compressed cache architecture. This paper suggests several techniques to reduce the decompression overhead and to manage the compressed blocks efficiently which include selective compression, fixed space allocation for the compressed blocks, parallel decompression, the use of a decompression buffer, and so on. Moreover a simple compressed cache architecture based on the above techniques and its management method are proposed. The results from trace-driven simulation show that this approach can provide around 35% decrease in the on-chip cache miss ratio as well as a 53% decrease in the data traffic over the conventional memory systems. Also, a large amount of the decompression overhead can be reduced, and thus the average memory access time can also be reduced by maximum 20% against the conventional memory systems.

关键词： Memory management Delay Hip Bandwidth parallel processing Laboratories Computer science Ores Read only memory Process design

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