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Conch: A Cyclic MapReduce Model for Iterative Applications

Conch: A Cyclic MapReduce Model for Iterative Applications

引用

Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： Ran Zheng Genmao Yu Hai Jin Xuanhua Shi Qin Zhang Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

MapReduce programming model is a popular model to simplify but speed up data parallel applications. However, it is not efficient for iterative applications because of its repeated data transmission with HDFS (Hadoop Distributed File system). Conch, a cyclic MapReduce model, is designed for efficient processing of iterative applications. In order to minimize network overhead, shared data is cached locally and a "map-shuffle" phase is presented with a combined transmission mechanism. Meanwhile, a prediction scheduler for iterative applications is brought out to achieve better data locality in terms of runtime information. The experiments show that Conch can support iterative applications transparently and efficiently. Compared with Hadoop and HaLoop in single-job environment, Conch can achieve 13%-17% improvements on K-Means and fuzzy C-Means. Especially in multi-job environment, 63.6% and 28.6% improvements can be obtained compared with Hadoop and HaLoop.

关键词： Delays Iterative methods Computational modeling Prediction algorithms Heart beat Data transfer Data models

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WiMA: A Novel Wireless Multicast Agent Mechanism for Live Streaming system

WiMA: A Novel Wireless Multicast Agent Mechanism for Live St...

引用

International Conference on Convergence Information technology

作者： Wenbin Jiang Xiaofei Liao Hai Jin Zhi Yuan Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781424431779

The bandwidth bottleneck and the high rate of losing packets are the major obstacles when extending P2P live streaming system to WLAN. To tide over them, a new wireless multicast agent mechanism (WiMA) based on the IP multicast buffering schedule is proposed. Wireless multicast agent gains media data by interacting with wired neighbor peers as a common P2P node, and sends data to other wireless peers in WLAN by means of multicast pushing and multicast patching. A normal wireless peer requests data according to the strategy of "emergent ones first". Experiments show that WiMA can save bandwidth in WLAN obviously with acceptable start delay and satisfied playing continuity.

关键词： Wireless LAN Peer to peer computing Bandwidth WiMAX Tides Delay Internet Smart phones Wireless networks Information technology

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An Asymmetrical Encryption Based automated trust negotiation model

An Asymmetrical Encryption Based automated trust negotiation...

引用

Inaugural IEEE-IES Digital Ecosystems and Technologies Conference, DEST

作者： Hai Jin Zhensong Liao Deqing Zou Chisong Li Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781424414895

Automated trust negotiation (ATN) is an important means to establish trust between strangers through the exchange of digital credentials and mobile access control policies specifying what combinations of credentials a stranger must submit. As a certificate may contain sensitive information, unlimited disclosure will leak valuable information or jeopardize individual privacy. In order to prevent information leakage, the negotiation protocol is designed so complicated that a requestor is hard to attain the access. In addition, if the encryption algorithm is short in security intensity, the transmitting message over the public channel is easy to be attacked. To solve these problems, an asymmetrical encryption based ATN model (AEBM) is proposed in this paper. AEBM adopts credentials with a flexible format to meet the requirements of access control policies, instead of disclosing the whole contents of a certificate. Further, AEBM uses asymmetric encryption technique to encrypt the transmitting message, which can prevent information from leaking. AEBM presents a new negotiation strategy to enhance the negotiation efficiency. A use case is studied to prove that AEBM is sound and reasonable.

关键词： Cryptography Access control Protocols Public key Educational institutions Authentication Ecosystems

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A Scalab.e Service Scheme for Secure Group Communication in grid

A Scalable Service Scheme for Secure Group Communication in ...

引用

IEEE Annual International Computer Software and Applications Conference (COMPSAC)

作者： Yunfa Li Hai Jin Deqing Zou Jieyun Chen Zongfen Han Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

In this paper, we propose a scalab.e service scheme for secure group communication in grid. In the service scheme, a series of methods and strategies are presented, such as the initialization methods for group member, administrative domain and virtual organization, the key distribution strategy and the rekeying strategy. In order to improve the scalab.lity of this service scheme, the services for a group are logically divided into two hierarchical levels, which is in accordance with the characteristics of group communication in grid. In addition, in order to show the efficiency and the scalab.lity of the service scheme, simulation experiments are done. The results show that the service scheme is efficient and scalab.e. Thus, the service scheme can satisfy the requirement of people in large-scale, dynamic grid environment.

关键词： grid computing Scalab.lity Large-scale systems Information security Public key Computer science Distribution strategy Analytical models Broadcasting Protocols

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Heterogeneous Medical Data Share and Integration on grid

Heterogeneous Medical Data Share and Integration on Grid

引用

International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Ran Zheng Hai Jin Qin Zhang Yingshu Liu Pan Chu Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

It is very significant for the medical and health enterprises to develop an efficient medical information grid to achieve sufficient medical data share and integration. In order to access heterogeneous data resources transparently, front agent is built on heterogeneous databases or medical systems, the same as the unified data models and mapping rules with grid services to communicate with upper grid middleware, so that users can query or access medical data conveniently. Two medical application instances, medical information integration and content-based image diagnosis or retrieval of emphysema disease, are introduced and realized with these technologies.

关键词： Biomedical imaging Medical diagnostic imaging Image databases Data models Middleware Medical services Biomedical equipment Information retrieval Image retrieval Content based retrieval

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esDMT: Efficient and scalab.e deterministic multithreading through memory isolation

esDMT: Efficient and scalable deterministic multithreading t...

引用

International Conference on Parallel and Distributed systems (ICPADS)

作者： Jie Sun Xiaofei Liao Long Zheng Hai Jin Yu Zhang School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Services Computing Technology and System Lab Cluster and Grid Computing Lab

Deterministic multithreading (DMT) system is well-known to eliminate the harmful program behaviors caused by nondeterminism, i.e., always proceeding the program execution into the same thread schedule for the same given input. To achieve this goal, two kinds of schedules are enforced by existing DMT systems. 1) A mem-based schedule ensures the determinism with the total order of the shared memory accesses, and 2) A sync-based schedule makes it by only enforcing the total order of the synchronization operations. Mem-schedule achieves full determinism but suffers from prohibitive overhead; while sync-schedule mitigates this overhead but cannot ensure the determinism for the race schedules, i.e., part determinism. Much recent research is devoted to the hybrid schedule combining the determinism of mem-schedule and efficiency of sync-schedule. However, they suffer from the practicability and scalab.lity problems due to the defects of their technical characteristics, such as trace collection in advance and huge schedule memoization. To address the above problem, this paper proposes esDMT, an efficient and scalab.e DMT system using a new technique of memory isolation. It can improve the efficiency by proceeding the execution of each thread in parallel within its private virtual memory, and defers the determinism guarantee by updating private memory into shared memory in a deterministic order according to deterministic lock algorithm, thus further reducing the overhead of inter-thread waiting. In contrast to the previous hybrid work avoiding the nondeterminism of race schedules offline based on the enormous historical records, our key insight is to eliminate the nondeterminism of race schedules online at runtime. Our experimental results on PARSEC benchmarks show that esDMT eliminates the nondeterminism successfully, almost gains the same performance as the sync-schedule (with

关键词： Instruction sets Schedules Synchronization Scalab.lity Clocks Computer crashes Runtime

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An Authenticated Encryption Mechanism for Secure Group Communication in grid

An Authenticated Encryption Mechanism for Secure Group Commu...

引用

International Conference on Internet computing in Science and Engineering (ICICSE)

作者： Yunfa Li Hai Jin Deqing Zou Sanmin Liu Zongfen Han Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

In grid computing, group communication is an important strategy to realize large-scale information resource sharing. However, it is very difficult to ensure the security of group communication in large-scale grid environment. In this paper, based on the basic theories of threshold signature and the basic characteristics of group communication in grid, we present four algorithms, including keys generating, individual signature generating and verifying, group signature generating and encrypting, decrypting and group signature verifying, which constitute the authenticated encryption mechanism for group communication in grid. Finally, we validate the correctness of the authenticated encryption mechanism proposed in this paper and analyze its security. In addition, the validity of this mechanism is verified by the experiments. The results show that it is efficient to ensure the security of group communication in grid.

关键词： Cryptography Communication system security Large-scale systems Mobile communication grid computing Character generation Mesh generation Information resources Information security Web and internet services

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A Novel Fast Approach for Convolutional Networks with Small Filters Based on GPU

A Novel Fast Approach for Convolutional Networks with Small ...

引用

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

作者： Wenbin Jiang Yiming Chen Hai Jin Bin Luo Ye Chi Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479989386

Recently, convolutional networks have achieved great successes in the field of computer vision. In order to improve the efficiency of convolutional networks, large amount of solutions focusing on training algorithms and parallelism strategies have been proposed. In this paper, a novel algorithm based on look-up table is proposed to speed up convolutional networks with small filters by applying GPU. By transforming multiplication operations in the convolution computation to some table-based summation operations, the overhead of convolution computation can be reduced largely. The process of creating table and looking up table is very appropriate for parallelization on GPU. Experiment results show that the proposed approaches can improve the speed of convolution computation by 20%-30%, compared with state-of-the-art existing works.

关键词： Convolution Graphics processing units Training Computational modeling Filtering algorithms Kernel Digital filters

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Virtual Machine Resource Management for High Performance computing Applications

Virtual Machine Resource Management for High Performance Com...

引用

International Symposium on Parallel and Distributed Processing with Applications, ISPA

作者： Zhiyuan Shao Hai Jin Yong Li Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

In this paper, we propose a scheme that manages the computational resource of virtual machines that are used to host high performance computing applications. Different from the static configuration methodology employed by the state-of-art virtual machine monitors, in our scheme, the virtual machines are automatically configured according to the actual load generated by the applications. NPB, HPL and kernel compilation are chosen as representative high performance computing applications to run inside the virtual machine constructed using our scheme, and the performance of such applications are compared with that obtained from the statically configured virtual machines. The comparison indicates that besides the great flexibility it brings, the performance penalty resulted by our scheme is below 5% in most cases, and the performance of the application running inside the automatically configured virtual machine is even better than that running inside the statically configured ones in some cases.

关键词： Virtual machining Resource management High performance computing Application software grid computing Virtual machine monitors Kernel Distributed processing Computer science technology management

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A Heterogeneous Data Parallel Computational Model for Cell Broadband Engine

A Heterogeneous Data Parallel Computational Model for Cell B...

引用

Chinagrid Annual Conference (Chinagrid)

作者： Bo Li Hai Jin Ran Zheng Qin Zhang Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9780769533063

Cell broadband engine (Cell BE) is a state-of-the-art heterogeneous multi-core processor. It is an accelerator-based multi-core architecture, which contains a powerful 64-bit dual-threaded PowerPC core and eight high efficient single-instruction-multiple-data (SIMD) cores. Apart from traditional parallel systems, the users must explicitly manage the communication, scheduling and load-balancing to achieve cellpsilas greatest performance. In this paper, a novel heterogeneous data parallel computational model on cell BE is proposed. This aggressive model could not only exploit computing power of SPE but also that of PPE and aggregate them together to achieve high performance. We investigate the performance of this model with naive ray tracing algorithm. The preliminary experimental results validate the efficiency of this model.

关键词： Computational modeling Computer architecture Data models Microprocessors Ray tracing Acceleration Optimization

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