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PIBUS: A network memory-based peer-to-peer IO buffering service

6th International IFIP-TC6 Networking Conference, NETWORKING 2007

作者： Zhang, Yiming Li, Dongsheng Chu, Rui Xiao, Nong Lu, Xicheng National Laboratory for Parallel and Distributed Processing NUDT Changsha Hunan410073 China

ISBN: (纸本)9783540726050

This paper proposes a network memory-based P2P IO BUffering Service (PIBUS), which buffers blocks for IO-intensive applications in P2P network memory like a 2-level disk cache. PIBUS reduces the IO overhead when local cache is missed due to speed advantage of network memory over disks, and improves hit ratio based on accurate classification of IO behaviors. © IFIP International Federation for Information processing 2007.

关键词： Peer to peer networks

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A stream system-on-chip architecture for high speed target recognition based on biologic vision

A stream system-on-chip architecture for high speed target r...

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12th Asia-Pacific Computer Systems Architecture Conference, ACSAC 2007

作者： Wu, Nan Yang, Qianming Wen, Mei He, Yi Xun, Changqing Zhang, Chunyuan National Laboratory for Parallel and Distributed Processing Chang Sha Hu Nan 410073 China

ISBN: (纸本)9783540743088

For target recognition based on biologic vision, an application-specific stream SOC: MASA-MI is described in this paper. MASA-MI consists of several heterogeneous cores, and a stream accelerator core is used to accelerate matching image which consumes the most time in target recognition. We implemented it on Altera EP2S60 FPGA. Result shows the 166MHz MASA-MI provides a peak performance of 585 fps. MASA-MI's performance is an order of magnitude higher than those of today's DSPs such as the Texas Instruments TMS320DM642 (600MHz). On the other hand, the cost is far less than special purpose processors. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Integrated circuit layout

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Towards a new methodology for estimating available bandwidth on network paths

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7th International Symposium on Advanced parallel processing Technologies, APPT 2007

作者： Lv, Shaohe Wang, Xiaodong Zhou, Xingming Yin, Jianping National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha Hunan 410073 China

ISBN: (纸本)9783540768364

This paper presents a novel methodology, called COPP, to estimate available bandwidth over a given network path. COPP deploys a particular probe scheme, namely chirp of packet pairs, which is composed of several packet pairs with decremental inter-packet spacing. After each pair chirp is received, COPP discovers all turning points, e.g. such packet pair that is interfered more seriously in contrast to its adjacent pairs, and give each point a distinct weight according to the degree to which the pair and its consecutive neighbors are interfered by cross traffic to yield an estimate. The final estimate is the average of the results of all chirps in a measurement episode. Two decision rules are developed to determine whether a packet pair is turning point We test COPP in various simulations and find that COPP can provide accurate results with relatively less overhead while adapt to network variations rapidly. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Bandwidth

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Collaborative search in large-scale unstructured peer-to-peer networks

Collaborative search in large-scale unstructured peer-to-pee...

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36th International Conference on parallel processing in Xi'an, ICPP

作者： Zhang, Yiming Li, Dongsheng Chen, Lei Lu, Xicheng National Laboratory for Parallel and Distributed Processing NUDT Department of Computer Science Hong Kong University of Science and Technology

ISBN: (纸本)076952933X

Searching in large-scale unstructured peer-to-peer networks is challenging due to the lack of effective hint information to guide queries. In this paper, we propose POP, a parallel, cOllaborative and Probabilistic search mechanism, in which query messages are viewed as search units to collaborate with each other and aggregate the distributed hints during the search process. A scheme called distributed Bloom Filter (DBF) is presented to propagate the hints with a bandwidth-aware manner, in which a node divides the received Bloom filter vector into subvectors and disseminates the fragments to its neighbors according to their bandwidth capacity. The effectiveness of POP is demonstrated through theoretical analysis and extensive simulations. © 2007 IEEE.

关键词： Bandwidth

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Scalable distributed resource information service for internet-based virtual computing environment

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Ruan Jian Xue Bao/Journal of Software 2007年第8期18卷 1933-1942页

作者： Zhang, Yi-Ming Li, Dong-Sheng Lu, Xi-Cheng National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha 410073 China

Based on the characteristics of evolution, autonomy and diversity of Internet resources, researchers recently proposed to realize the publication and query of Internet resource information through common DHT (distributed Hash table) information services. However, current research on resource information services is insufficient in generality, usability and adaptability. Aiming at the needs of iVCE (Internet-based virtual computing environment) for resource aggregation, the SDIRIS (scalable distributed resource information service) is proposed to construct. First, the adaptive DHT (A-FissionE) infrastructure is presented, which supports to adapt to different system scale and stability transparently. Second, the MR-FissionE, which is an efficient multiple-attribute range query algorithm, is presented based on A-FissionE. Theoretical analysis and experimental results prove that SDIRIS can realize resource information publication and query efficiently.

关键词： Information services

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The detection and assessment of possible RNA secondary structure using multiple sequence alignment

Proceedings of the ACM Symposium on Applied Computing

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Proceedings of the ACM Symposium on Applied Computing 2007年 133-137页

作者： Fang, Xiaoyong Wang, Zhenghua Luo, Zhigang Yuan, Bo Ding, Fan National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha 410073 China Department of Biomedical Informatics College of Medicine and Public Health Ohio State University Columbus OH 43210-1239 United States

ISBN: (纸本)1595934804;9781595934802

We here devise a new method for detecting and assessing RNA secondary structure by using multiple sequence alignment. The central idea of the method is to first detect conserved stems in the alignment using a special matrix and then assess them by evaluating the ratio of the signal to the noise. We tested the method on data sets composed of pairwise and three-way alignments of known ncRNAs. For the pairwise tests, our method has sensitivity 61.42% and specificity 97.05% for structural alignments, and sensitivity 42.05% and specificity 98.15% for BLAST alignments. For the three-way tests, our method has sensitivity 65.17% and specificity 97.96% for structural alignments, and sensitivity 40.70% and specificity 97.87% for CLUSTALW alignments. Our method can detect conserved secondary structures in gapped or ungapped RNA alignments. Copyright 2007 ACM.

关键词： RNA

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A Resource Information Management System for RAM Grid

A Resource Information Management System for RAM Grid

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第六届网格与协同计算国际会议(The Sixth International Conference on Grid and Cooperative Computing GCC 2007)

作者： Rui Chu Nong Xiao Xicheng Lu National Laboratory for Parallel and Distributed Processing ChangSha HuNan China

RAM Grid is a novel grid system to share the distributed memory resources across the wide area network, and provides disk cache for other nodes which are short of memory. The resource information management system, which monitors and manages the resources in grid environment, takes a key role for RAM Grid. Under the special requirements of RAM Grid, we propose a grid resources management system GridEye, the architecture and mechanism are also discussed. In order to improve the performance, a new caching strategy optimized for RAM Grid is *** have verified the effectiveness of the proposed method through analysis and experiments on the implemented prototype system.

关键词： Information management Read-write memory Random access memory Memory management Resource management Grid computing Sections Environmental management Prototypes Performance analysis

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A clustering model for memory resource sharing in large scale distributed system

A clustering model for memory resource sharing in large scal...

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International Conference on parallel and distributed Systems (ICPADS)

作者： Rui Chu Nong Xiao Xicheng Lu National Laboratory for Parallel and Distributed Processing ChangSha Hunan China

As an application of large scale distributed network computing system, RAM Grid tries to solve the problem of memory resource sharing and utilization. Due to the special properties of memory, traditional resource information management approaches cannot be adapted easily. This paper proposes a clustering based resource aggregating scheme under the background of RAM Grid, which can reduce the scale of resource information management efficiently. With analogy to the force field and potential energy theory in physics, the basic model, the force field-potential energy model, and the corresponding distributed algorithms are proposed, respectively. The model and algorithms are also evaluated by real network topologies based simulation.

关键词： Resource management Large-scale systems Random access memory Read-write memory Information management Computer networks distributed computing Grid computing Memory management Potential energy

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RAM Grid Middleware for Autonomic Cooperative Caching

RAM Grid Middleware for Autonomic Cooperative Caching

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第六届网格与协同计算国际会议(The Sixth International Conference on Grid and Cooperative Computing GCC 2007)

作者： Rui Chu Jiancong Xie Nong Xiao Xicheng Lu National Laboratory for Parallel and Distributed Processing ChangSha HuNan China

As an innovative grid computing technique for sharing the distributed memory resources in a widearea network, RAM Grid exploits the free nodes to provide remote memory for others. The data intensive applications with massive random disk IO, such as the web server or database systems, have potential benefits from RAM Grid. We analyzed the trace collected from real servers, and proposed the key issues and solution of the caching RAM Grid system for such applications,to reduce the IO overhead. Furthermore, we proposed an autonomic cooperation mechanism to improve the performance through time correlation and content redundancy detection and elimination. We have verified the effectiveness of the proposed method through comprehensive trace-driven simulations.

关键词： Middleware Cooperative caching Random access memory Read-write memory Grid computing Wide area networks Computer networks Web server Database systems Application software

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Efficient Rate Adaptation in Multi-rate 802.11 Networks

Efficient Rate Adaptation in Multi-rate 802.11 Networks

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IEEE Symposium on Computers and Communications (ISCC)

作者： Shaohe Lv Xiaodong Wang Xingming Zhou Chi Liu National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha Hunan China

Given the multi-rate option in most 802.11 standards, rate adaptation based on dynamic channel condition is crucial to the system performance. This paper presents an efficient rate adaptation mechanism at MAC layer, called ERA, to improve the transport layer throughput. Such scheme raises the transmission rate aggressively, e.g., upon only a few consecutive successful transmissions. In opposite, we reduce the transmission rate more cautiously only when the station encounters severe consecutive frame losses or relatively high loss ratio at MAC layer. ERA also attempts to protect the performance under steady condition without losing the ability to respond to the channel variation quickly. We evaluate ERA using NS-2 simulations and find that it performs better than or at least similarly with many other proposals in various scenarios. ERA is a sender-based method and requires minor modification at sender side only, thus completely standard-compliant and very easy to be implemented and deployed.

关键词： System performance Throughput Propagation losses Protection Laboratories distributed processing Performance evaluation Proposals Physical layer Data mining

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