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Lecture Notes in computer science

作者： Yang, Chao-Tung Wang, Kuan-Chieh Cheng, Hsiang-Yao Kuo, Cheng-Ta Hsu, Ching-Hsien High-Performance Computing Laboratory Department of Computer Science Tunghai University Taichung 40704 Taiwan Department of Computer Science and Information Engineering Chung Hua University Hsinchu 300 Taiwan

ISBN: (纸本)9783642236402

With the development of electronic of government and business, the implementation of these services are increasing the demand for servers, each year a considerable number of the procurement server and out of the server are too old to provide better service. However, due to the speed of the server out of nowhere near the rate of increase, the continued expansion of the server, on behalf of our need to prepare more space, power, air conditioning, network, human and other infrastructure. Derived from these costs, long years, the often less than the purchase price of the server. And the provision of these services is actually quite energy-intensive, especially when the server is running at low utilization, the making idle resources, waste, which is caused by the energy efficiency of data centers the main reason for the low. Even in a very low load, such as 10% CPU utilization, the total power consumption is more than 50% in the peak. Similarly, if the disk, network, or any such resource is the bottleneck, it will increase the waste of other resources. The "Green" became a hot key word recently. And we aimed the topic and proposed power management approach with virtualization technology. © 2011 Springer-Verlag.

关键词： Virtualization

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Dasher: A peer-to-peer content distribution system based on combined network coding

Dasher: A peer-to-peer content distribution system based on ...

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2009 2nd IEEE International Conference on Broadband Network and Multimedia Technology, IEEE IC-BNMT2009

作者： Kaiqian, Ou Yinlong, Xu Guanjun, Ma Yulin, Zhu Department of Computer Science and Technology University of Science and Technology of China Key Laboratory on High Performance Computing Anhui Province China

ISBN: (纸本)9781424450053

Network coding can ease the block scheduling and thus makes the distribution more efficient. However, the complexities of encoding and decoding increase sharply as the content size scales up. In this paper, we propose a coding scheme which combines chunked coding and sparse linear network coding to reduce both encoding and decoding costs of content distribution. Based on the combined scheme, we implement a P2P content distribution system, named Dasher, where Local-Rarest-First scheme is adopted for chunk scheduling. Under the same system architecture, we implement three comparative systems, a BitTorrent-like system, named Mybt, a system only with sparse coding, named Sparser and a system using chunked coding, named Chunker. We conduct extensive experiments to compare the performance among these four systems. The experimental results show that Dasher with certain chunk sizes can reduce the average downloading time up to 15% compared with Mybt, and up to 43% with Chunker. With proper chunk sizes, the downloading time of Dasher is almost the same with Sparser. The average decoding rate of Dasher is the same with Chunker, and is nearly m times as fast as Sparser, where m is the number of chunks. Moreover, with respect to robustness, Dasher performs almost as well as Chunker, better than Mybt, but worse than Sparser. ©2009 IEEE.

关键词： Network coding

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How can network coding help P2P content distribution?

How can network coding help P2P content distribution?

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2009 IEEE International Conference on Communications, ICC 2009

作者： Ma, Guanjun Xu, Yinlong Kaiqian, Ou Wen, Luo Department of Computer Science and Technology University of Science and Technology of China Key Laboratory on High Performance Computing Anhui Province China

ISBN: (纸本)9781424434350

It is well known that network coding can enhance the performance of Peer-to-Peer (P2P) content distribution systems since it benefits block scheduling. In this paper, we introduce our P2P content distribution system "SmartCode" with sparse network coding on PlanetLab. SmartCode uses pre-checking to avoid linearly dependent blocks being transmitted. Under the same system architecture, we also implement two systems "Ecode" and "LRF". Ecode is also based on sparse network coding, but without pre-checking. LRF is BitTorrent-like, using local-rarest-first for block scheduling. We conduct extensive experiments to compare the performances among the three systems. Experimental results show that the distributing time of SmartCode is reduced by 11% on average and up to 19% compared with LRF, and by 7% on average and up to 16% compared with Ecode. We also conduct experiments to analyze robustness among the three systems under the assumption that peers join in and leave a content distribution session dynamically and the seed leave the session after it has transmitted a fixed percentage of blocks over the total blocks of the content. In dynamical cases, SmartCode outperforms evidently than Ecode and LRF in downloading time and the times of peers completing the downloading. ©2009 IEEE.

关键词： Network coding

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A peer-to-peer file resource sharing system for mobile devices

A peer-to-peer file resource sharing system for mobile devic...

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3rd International Conference on Grid and Pervasive computing Symposia/Workshops, GPC 2008

作者： Yang, Chao-Tung Chen, Chun-Jen Chen, Hung-Yen Hsu, Ching-Hsien High-Performance Computing Laboratory Department of Computer Science and Information Engineering Tunghai University Taichung 40704 Taiwan Department of Computer Science and Information Engineering Chung Hua University Hsinchu 30013 Taiwan

ISBN: (纸本)9780769531779

In this paper, we present a peer-to-peer file sharing platform combined with Data Grid system for mobile devices. Facing the limit of network bandwidth and unstable signal strength in wireless network, wireless peer-to-peer architecture is now widely accepted as a new computing paradigm for wireless devices. In wireless P2P architecture, one can speedup parallel file transfer and enhance the communication stability by establishing multiple concurrent P2P connections. This paper mainly applies Data Grid system to deal with the problems of file location discovery and client certification. We propose an architecture that uses GridFTP protocol to establish a video sharing platform for mobile devices. Combined with data grid, the system can perform video analysis and classification upon on its computing resources, keeping the files in the newest state at all times. © 2008 IEEE.

关键词： Network architecture

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Lexicographically fair bandwidth allocation in multi-session layered media multicast using network coding

Lexicographically fair bandwidth allocation in multi-session...

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2009 2nd IEEE International Conference on Broadband Network and Multimedia Technology, IEEE IC-BNMT2009

作者： Xiaobin, Lin Yinlong, Xu Yulin, Zhu Kaiqian, Ou Department of Computer Science and Technology University of Science and Technology of China Key Laboratory on High Performance Computing Anhui Province China

ISBN: (纸本)9781424450053

Layering techniques effectively cope with network heterogeneity encountered in media distribution. Recent work on network coding shows that the multicast throughput can be greatly improved by allowing coding operation at the intermediate nodes in the network. In this paper, we study the problem of lexicographically fair bandwidth allocation to make the receivers of different sessions share network bandwidth fairly in multi-session layered media multicast using network coding and formulate it into an integer linear programming (ILP). Because the ILP is not time efficient when the network is large, a LP-based polynomial time algorithm ApprOpt is proposed to approximate the optimal solution of the ILP. Numerical results show that the throughput of all media multicast sessions is significantly improved by network coding, and that algorithm ApprOpt allocates network bandwidth very close to the optimal solution of the ILP and utilizes network bandwidth efficiently. ©2009 IEEE.

关键词： Network coding

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A computational-intelligence-based optimization of agents' initial positions in land combat simulation

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自然科学进展(英文版) 2003年第8期13卷 620-625页

作者： WU Chunguo LIANG Yanchun GE Hongwei CAO Lijuan LEE Heow Pueh College of Computer Science and Technology Jilin University Changchun 130012 China Institute of High Performance Computing Singapore 117528 Singapore College of Mathematics Science Jilin University Changchun 130012 China Institute of High Performance Computing Singapore 117528 Singapore Institute of High Performance Computing Singapore 117528 Singapore Department of Mechanical Engineering National University of Singapore Singapore 119260 Singapore

The optimization of agents' initial properties enables agents to perform their assigned tasks more perfectly. This paper presents an optimizing method using the combination of radial basis function (RBF) neural network and genetic algorithm (GA). In the land combat simulation, the method can ensure that the agents optimized defeat the agents not optimized absolutely. Compared with the optimization based on support vector machines (SVM), the proposed method improves the efficiency more than twenty times, so it suits the cases where the speed as well as performance is required.

关键词： multi-agent system RBF neural network support vector machine land combat simulation genetic algorithm

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Using spatial correlations in distributed video coding

Using spatial correlations in distributed video coding

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International Symposium on Artificial Intelligence and Signal Processing

作者： Fathy, Mahmood Haqqani, Mohammad High Performance Computing Lab. Computer Engineering Department Iran University of Science and Technology Tehran Iran

ISBN: (纸本)9781424498345

Distributed video coding (DVC) is a new paradigm of coding that makes very interest to itself in the past decade. It's usually based on temporal correlations between successive frames which are called key frames. But this approach failed for high object motion in a scene and need very complex decoder to cover it. In this paper we propose a novel technique to use spatial correlation instead of temporal correlation in a frame by dividing a single frame to two sub frames which one of them is used as a key frame for generate side information at the decoder. Simulation results show a significant improvement on rate distortion parameter in DVC schema. © 2011 IEEE.

关键词： Decoding

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A study of code reuse and sharing characteristics of Java applications 1

A study of code reuse and sharing characteristics of Java ap...

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1st Workshop on Workload Characterization, WWC 1998

作者： Conte, M.T. Trick, A.R. Gyllenhaal, J.C. Hwu, W.W. Department of Electrical and Computer Engineering Coordinated Science Laboratory Center for Reliable and High-performance Computing University of Illinois at Urbana-Champaign United States

ISBN: (纸本)0769504507

Presents a detailed characterization of Java application and applet workloads in terms of reuse and sharing of Java code at the program, class and method level. In order to expose more sharing opportunities, techniques for detecting code equivalence even in the presence of minor code changes or constant pool index differences) are also proposed and examined. The analyzed application workload consists of the recently released SPECjvm98 benchmarks, and the applet workload is derived from three extensive searches of the Internet between May 1997 and May 1998 using an enhanced Web crawler. Analysis of these workloads reveals several new code sharing and optimization opportunities. © 1998 IEEE.

关键词： Java programming language

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performance evaluation of container-based high performance computing ecosystem using OpenPOWER 32nd

Performance evaluation of container-based high performance c...

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32nd International Conference on high performance computing, ISC high performance 2017

作者： Kuity, Animesh Peddoju, Sateesh Kumar High Performance Computing Lab Department of Computer Science and Engineering Indian Institute of Technology Roorkee247667 India

ISBN: (纸本)9783319676296

Container-based high performance computing (HPC) has started gaining popularity due to its almost negligible performance penalty compared to the BareMetal hardware. Although HPC hardware architectures and programming models are continuously evolving, the platform models are suffering from the HPC community’s awareness. Power-awareness, hardware and application-aware co-design along with security related concerns have attracted the most in recent time to empower the platform models. Otherside, the OpenPOWER ecosystems have stepped into our life to fulfill the thirst of exploiting the last drop of a performance benefit from our invested system. It has Power8 compliant processor with a larger cache, big fat instructions and data path accompanied by the popular coherent accelerator. In this paper, we have proposed a container-based HPC ecosystem established using OpenPOWER machine. The performance of the designed and developed ecosystem is evaluated stressing on different subcomponents of the system such as processor, memory, IO, and interconnect. Finally, the results are compared with the performance of the equivalent environments made of virtual machines and BareMetal hardware. © Springer International Publishing AG 2017.

关键词： Ecosystems

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A channel-level RAID5 schema based physical address in SSD 20th

A channel-level RAID5 schema based physical address in SSD

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20th Annual Conference on computer engineering and Technology, NCCET 2016

作者： Feng, Ya Xing, Yuxuan Xiao, Nong Liu, Fang State Key Laboratory of High Performance Computing Department of Computer Science National University of Defense Technology Changsha China

ISBN: (纸本)9789811031588

Flash-based solid state disks (SSDs) have been widely used for its high performance, low power, and concurrency features. With the increase in storage capacity, the reliability problem of SSD is becoming increasingly serious. In this paper, we implemented a technique based SSDs by constructing RAID-5 to enhance the reliability of SSD while maintaining its performance. First, we construct RAID-5 stripe based on SSD physical address which means no mapping tables to store stripe information. Second, our schema constructs dynamic stripe with log-structure to solve the inherent small write problem associated with conventional RAID-5. Third, since the correlation between data stripe, we realize garbage collection based on stripe group. Finally, we conduct extensive simulations using real-world traces and synthetic benchmarks in the SSDsim [1]. The experimental results show that we consume less than 7% of the performance and 6% of the storage consumption of SSD to achieve inner-channel RAID-5 to improve the reliability of SSD. © Springer Nature Singapore Pte Ltd. 2016.

关键词： Reliability

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