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16th IEEE International Conference on parallel and distributed Systems, ICPADS 2010

作者： Huang, Feng Li, Dongsheng National Lab. for Parallel and Distributed Processing College of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9780769543079

Combining virtual machine technology, virtual computing is able to effectively aggregate the widely distributed resources to provide users services. We view the federation of multiple data centers and voluntary resources on the Internet as a very large scale resource pool. Based on the tree structure of the pool, this paper proposes a virtual machine deployment algorithm, called iVDA, considers users' requests and the capabilities of the physical resources as well as the dynamic load, implements an adaptive mechanism to scheduling servers to host virtual machines forming virtual execution environments for various applications, and supports on-demand computing. © 2010 IEEE.

关键词： Dynamic loads

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Predicting job failures in auvergrid based on workload log analysis

Predicting job failures in auvergrid based on workload log a...

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作者： Saadatfar, Hamid Fadishei, Hamid Deldari, Hossein Parallel and Distributed Processing Lab Computer Engineering Department Ferdowsi University of Mashhad Azadi Sq. Mashhad Iran

Grid systems are popular today due to their ability to solve large problems in business and science. Job failures which are inherent in any computational environment are more common in grids due to their dynamic and complex nature. Furthermore, traditional methods for job failure recovery have proven costly and thus a need to shift toward proactive and predictive management strategies is necessary in such systems. In this paper, an innovative effort has been made to predict the futurity of jobs in a production grid environment. First of all, we investigated the relationship between workload characteristics and job failures by analyzing workload traces of AuverGrid which is a part of EGEE (Enabling Grids for E-science) project. After the recognition of failure patterns, the success or failure status of jobs during 6 months of AuverGrid activity was predicted with approximately 96% accuracy. The quality of services on the grid can be improved by integrating the result of this work into management services like scheduling and monitoring. © Ohmsha, Ltd. and Springer Japan 2012.

关键词： Bayesian networks

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A mobile recommendation system based on logistic regression and Gradient Boosting Decision Trees

A mobile recommendation system based on logistic regression ...

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2016 International Joint Conference on Neural Networks, IJCNN 2016

作者： Wang, Yaozheng Feng, Dawei Li, Dongsheng Chen, Xinyuan Zhao, Yunxiang Niu, Xin National Lab for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha410003 China

ISBN: (纸本)9781509006199

Real-life behaviors shown by the mobile users typically exhibit plenty noises, making it hard to construct an effective recommendation engine. In this paper, we present a fused model based on the LR algorithm and the GBDT algorithm to recommend vertical industry commodities in a mobile setting. A set of specifically designed methods are proposed to deal with the data preprocessing and feature extraction problem for the mobile recommendation scenario. The proposed method is evaluated on a large scale real-world dataset provided by the Alibaba mobile shopping department. Result on the F1 score has seen an improvement of 2%-36% compared with the baseline. © 2016 IEEE.

关键词： Recommender systems

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Skyline query processing on interval uncertain data

Skyline query processing on interval uncertain data

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作者： Li, Xiaoyong Wang, Yijie Li, Xiaoling Wang, Guangdong National Lab. for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha China

ISBN: (纸本)9780769546698

Many recent applications involve processing and analyzing uncertain data. Recently, several research efforts have addressed answering skyline queries efficiently on massive uncertain datasets. However, the research lacks methods to compute these queries on uncertain data, where each dimension of the uncertain object is represented as an interval or an exact value. In this paper, we extensively study the problem of skyline query on these interval based uncertain objects, which has never been studied before. We first model the problem of querying the skylines on interval datasets. Typically, we address two efficient algorithms with I/O optimal for the conventional interval skyline queries and constrained interval skyline queries, respectively. Extensive experiments demonstrate the efficiency of all our proposed algorithms. © 2012 IEEE.

关键词： Query processing

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Efficient parallel implementation of a density peaks clustering algorithm on graphics processing unit

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Frontiers of Information Technology & Electronic Engineering 2017年第7期18卷 915-927页

作者： Ke-shi GE Hua-you SU Dong-sheng LI Xi-cheng LU National Lab for Parallel and Distributed Processing College of Computer National University of Defense Technology Changsha 410003 China

The density peak （DP） algorithm has been widely used in scientific research due to its novel and effective peak density-based clustering approach. However, the DP algorithm uses each pair of data points several times when determining cluster centers, yielding high computational complexity. In this paper, we focus on accelerating the time-consuming density peaks algorithm with a graphics processing unit （GPU）. We analyze the principle of the algorithm to locate its computational bottlenecks, and evaluate its potential for parallelism. In light of our analysis, we propose an efficient parallel DP algorithm targeting on a GPU architecture and implement this parallel method with compute unified device architecture （CUDA）, called the ‘CUDA-DP platform＇. Specifically, we use shared memory to improve data locality, which reduces the amount of global memory access. To exploit the coalescing accessing mechanism of CPU, we convert the data structure of the CUDA-DP program from array of structures to structure of arrays. In addition, we introduce a binary search-and-sampling method to avoid sorting a large array. The results of the experiment show that CUDA-DP can achieve a 45-fold acceleration when compared to the central processing unit based density peaks implementation.

关键词： Density peak Graphics processing unit parallel computing Clustering

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An online service-oriented performance profiling tool for cloud computing systems

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Frontiers of Computer Science 2013年第3期7卷 431-445页

作者： Haibo MI Huaimin WANG Yangfan ZHOU Michael Rung-Tsong LY~ Hua CAI Gang YIN National Lab for Parallel & Distributed Processing National University of Defense Technology Changsha 410073 China Shenzhen Research Institute The Chinese University of Hong Kong Shenzhen 518000 China Computing Platform Alibaba Cloud Computing Company Hangzhou 310000 China

The growing scale and complexity of component interactions in cloud computing systems post great challenges for operators to understand the characteristics of system performance. Profiling has long been proved to be an effective approach to performance analysis; however, existing approaches confront new challenges that emerge in cloud computing systems. First, the efficiency of the profiling becomes of critical concern; second, service-oriented profiling should be considered to support separation-of-concerns performance analysis. To address the above issues, in this paper, we present P-Tracer, an online performance profiling tool specifically tailored for cloud computing systems. P-Tracer constructs a specific search engine that proactively processes performance logs and generates a particular index for fast queries; second, for each service, P-Tracer retrieves a statistical insight of performance characteristics from multi-dimensions and provides operators with a suite of web-based interfaces to query the critical information. We evaluate P- Tracer in the aspects of tracing overheads, data preprocessing scalability and querying efficiency. Three real-world case studies that happened in Alibaba cloud computing platform demonstrate that P-Tracer can help operators understand soft-ware behaviors and localize the primary causes of performance anomalies effectively and efficiently.

关键词： cloud computing performance profiling performance anomaly visual analytics

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Agent framework based on distributed object

Proceedings of the Conference on Technology of Object-Orient...

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Proceedings of the Conference on Technology of Object-Oriented Languages and Systems, TOOLS 2000年第TOOL 36期 188-194页

作者： Zhou, Jian Zhou, Minghui Wu, Quanyuan Natl Lab for Parallel & Distributed Processing Hunan China

In the process of developing distributed applications, system reliability, availability, openness, resource sharing and reusability, etc are very complex and difficult to solve. Resent researches about agent theory displays that agent-oriented technology may be an effective effort in handling these problems. This paper first discusses the relationships of distributed system in agent viewpoint, then presents an agent framework based on distributed object which could be used to construct enterprise distributed application. To enhance the openness and resource sharing in distributed systems, an agent communication language - KQML is introduced and implemented in the framework.

关键词： Object oriented programming

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Formal Proof for a General Architecture of Hybrid Prefix/Carry-Select Adders

Formal Proof for a General Architecture of Hybrid Prefix/Car...

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10th International Conference on Algorithms and Architectures for parallel processing

作者： Liu, Feng Tan, Qingping Song, Xiaoyu Chen, Gang National Lab. of Parallel Distributed Processing Hunan China ECE Department Portland State University Portland OR United States Lingcore Lab. Portland OR United States

ISBN: (纸本)9783642131189

In this paper, we present a general architecture of hybrid prefix/carry-select adder. Based on this architecture, we formalize the hybrid adder's algorithm using the first-order recursive equations and develop a proof framework to prove its correctness. Since several previous adders in the literature are special cases of this general architecture, our methodology can be used to prove the correctness of different hybrid prefix/carry-select adders. The formal proof for a special hybrid prefix/carry-select adder shows the effectiveness of the algebraic structures built in this paper.

关键词： Adders

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Creating virtual networks for distributed virtual computing environment

Creating virtual networks for distributed virtual computing ...

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15th International Conference on parallel and distributed Systems, ICPADS '09

作者： Li, Dongsheng Chen, Yixin Huang, Feng National Lab. for Parallel and Distributed Processing College of Computer National University of Defense Technology Changsha City Hunan Province China

ISBN: (纸本)9780769539003

Virtual network is an important approach to support multiple legacy applications running unmodified in distributed virtual computing environments. A virtual networking approach called VirNet is proposed in this paper. VirNet can build multiple customized and isolated virtual networks simultaneously on the same physical hosts in the network, and it enables existing distributed applications written for LANs to run seamlessly on Internet. VirNet is designed completely in user space and requires no change to the kernel of operating systems. Experimental evaluation performed by a reference implementation shows that VirNet is efficient. The latency overhead caused by VirNet is very small and the bandwidth of VirNet is more than 85% of the available physical network bandwidth in both the LAN and emulated WAN environments. © 2009 IEEE.

关键词： Taps

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Model transformation based verification of Web services composition

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4th International Conference on Grid and Cooperative Computing - GCC 2005

作者： Yang, YanPing Tan, QingPing Xiao, Yong School of Computer Science National University of Defense Technology Changsha 410073 China National Lab. of Parallel Distributed Processing Changsha 410073 China

ISBN: (纸本)3540305106

Current Web services composition proposals, such as BPEL, BPSS, BPMN and WSCI, provide notations for describing the control and message flows in Web service collaborations. However, such proposals remain at the descriptive level, without providing any kind of mechanisms or tool support for verifying the composition specified in the proposed notations. In this paper, we present to analyze and verify Web services composition by using CP-nets. CP-nets combine the strengths of Petri nets with the expressive power of high-level programming and have sound mathematical semantics. These services composition proposals can be transformed by model transformation rules into CP-nets, which can be used to analyze the performance and to investigate behavioral properties by CP-nets specialized tools. © Springer-Verlag Berlin Heidelberg 2005.

关键词： World Wide Web

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