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2011 IEEE Asia-Pacific services computing Conference, APSCC 2011

作者： Tong, Guan Jin, Hai Xie, Xia Cao, Wenzhi Yuan, Pingpeng Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769546247

Virtualization as a powerful and convenient technique has been widely used recently. Inserting the VMM between the hardware and operation system enables multiple virtual machines simultaneously running on hardware. However, these changes in system architecture, while improving the whole physical computing resources' utilization, also pay a certain price for virtualization. How to measure this part of CPU overhead, and how about the relationship between this part of CPU overhead and virtual machine number and the type of workload executing in virtual machine are two important questions to the further research of virtualization performance. In this paper we provide a system to measure the overhead of virtualization. With this system we could dynamically obtain the utilization of computing resource. Based on the analysis to the results of several experiments, we compare and study the relationship between the different factors and the overhead of virtualization. Finally, we predict the probably trend of the overhead under the impact of some factors. © 2011 IEEE.

关键词： Virtualization

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Fast saving and restoring virtual machines with page compression

Fast saving and restoring virtual machines with page compres...

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2011 International Conference on Cloud and Service computing, CSC 2011

作者： Deng, Li Jin, Hai Wu, Song Shi, Xuanhua Zhou, Jiangfu Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781457716362

More and more enterprises are moving beyond server virtualization to desktop virtualization in recent years. In virtualization environments, centralized shared storage systems are generally used to take advantage of virtualization features such as VM migration. Network file system (NFS) is considered to be the best choice in small or medium sized LANs due to its flexibility and low cost. But it becomes the bottleneck when many clients access the server simultaneously, especially when multiple virtual machines access a large amount of data at the same time, such as operation save and restore. In this paper, we present a new method named ComIO to quickly save and restore virtual machines using page compression. Based on the analysis of virtual machines' memory characteristics, we design a fast enhanced characteristic-based compression (ECBC) algorithm. Combined with multi-threaded techniques, the compression tasks are parallelized for significantly shortened compresssion time. Page boundary alignment is proposed to enable wanted page data to be directly extracted from the compressed block. The experimental results demonstrate that compared with Xen, our method ComIO not only greatly reduces the time spent on saving and restoring virtual machines on average, but also indirectly augments the effective storage space. © 2011 IEEE.

关键词： Virtual machine

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MoClouDesk: Virtualized desktop for mobile environment

MoClouDesk: Virtualized desktop for mobile environment

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14th IEEE Int. Conf. on Computational Science and Engineering, CSE 2011, the 11th International Symposium on Pervasive systems, Algorithms, and Networks, I-SPAN 2011, and the 10th IEEE Int. Conf. on Ubiquitous computing and Communications, IUCC 2011

作者： Liao, Xiaofei Jin, Hai Bao, Zheng Li, He Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769544779

Mobile devices such as PDAs and cellphones, limited to its' computing and storage capability, are not capable to run ordinary PC applications. But virtualization technology gives us another choice: the software can run on a server (generally in a virtual machine) and the user interface is transmitted to the client. We have developed MoClouDesk, a virtualized desktop architecture for mobile devices, which provides a real virtual working environment. MoClouDesk virtualizes the desktop by forming a desktop environment, similar to local desktop, while all the applications are running on the virtual machine of remote servers. Users can use different applications from cross-platform operating systems, and use them just the same as local applications. Users could personally customize and update the applications list from the application templates library. This paper explores how to build a virtual desktop environment for mobile device. Experiments demonstrate and evaluate its efficiency and effectiveness. © 2011 IEEE.

关键词： Virtualization

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Sharing virtual USB device in virtualized desktop

Sharing virtual USB device in virtualized desktop

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2011 4th International Symposium on Parallel Architectures, Algorithms and Programming, PAAP 2011

作者： Liao, Xiaofei Xie, Xiao Jin, Hai Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769545752

With the development of computer science, desktop virtualization technology is more and more popular. In virtualized desktop, it is a very significant research to share periphery devices in the client-end computer seamlessly. We implement a device sharing mechanism to extend the universal serial bus in client-end host to the network for server-end host using transparently. This virtual device bus is deployed in the driver layer so that most applications and drivers in virtualized desktop could access remote shared devices through original interface. After deploying the virtual device bus driver, the duplicated virtual device could be accessed just like a real local device. In our implementation, the virtual device bus driver, which is the main module for virtualizing real USB devices and the interface for applications, is OS independent. Experiments show that the mechanism has a very friendly and easy interface to access virtual USB devices, and good performance. © 2011 IEEE.

关键词： Buses

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A web-based phylogenetic analysis for a query gene

A web-based phylogenetic analysis for a query gene

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5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011

作者： Tan, Shenglong Wu, Song Services Computing Technology and System Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China School of Computer Hubei University of Economics Wuhan China

ISBN: (纸本)9781424450893

We present a robust web server called Phytree of a query gene for phylogenetic analysis from the latest protein database with a user-friendly, interactive graphical user interface. Phytree of a query gene combines a BLAST search with a suite of tools that allows interactive, phylogenetic-oriented exploration of the BLAST results and flexible selection of homologous sequences among the BLAST hits. Once the selection of the BLAST hits is done, the corresponding sequences can be passed to the phylogenetic tree reconstruction pipelines (multiple alignment, data process, phylogenetic reconstruction, tree visualization). As the major technological innovation, selection of a meaningful subset of BLAST hits is implemented using pipeline programming and tree visualization used Java-based recursive method that allows trees to be integrated and viewed seamlessly in standard web browsers with no extra software required. Phytree of a query gene only needs users to copy their amino acid sequence of their query gene to the input box, and the phylogenetic tree will be built once and for all. This function is very practical for non-specialist in phylogeny. Moreover, Phytree of a query gene introduces several new methods in treatment of intermediate results, which makes it much faster, easier and more accurate, robust in phylogenetic tree reconstruction. It is specially designed for users who have no experience in phylogeny. It is freely available on our web page: © 2011 IEEE.. © 2011 IEEE.

关键词： Genes

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RAPN: Network attack prediction using ranking access petri net

Proceedings - 2011 6th Annual ChinaGrid Conference, ChinaGri...

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Proceedings - 2011 6th Annual ChinaGrid Conference, ChinaGrid 2011 2011年 108-115页

作者： Traore, Moussa Djiriba Jin, Hai Zou, Deqing Qiang, Weizhong Xiang, Guofu Services Computing Technology and System Lab. Cluster and Grid Computing Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769544724

Exploits sequencing is a typical way by which an attacker breaks into a network. In such a scenario, each exploit lays as an atomic proposition for subsequent exploits. An attack path is seen as a succession of exploits which take an attacker right to his/her final goal. The set of all possible attack paths form an attack graph. Researchers have proposed a multitude of techniques to generate attack graph which grows exponentially in the size of the network. Hence it is preferable to optimize the choice of solutions which avoid the cost of scalability and cumbersome. In this paper, we propose a comprehensive approach to network vulnerability analysis by ranking access Petri net graph and utilizing a penetration tester's perspective of maximal level of access possible on a host. Our approach has the following benefits: it provides a simple model in which an analyst can work, its algorithmic complexity is polynomial in the size of the network, and has the ability of scaling well to large size networks. Nevertheless, it has some drawback as in place of all possible attack paths, we seek only good attack paths. An analyst may make suboptimal choices when repairing the network. © 2011 IEEE.

关键词： Petri nets

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A Rule-based Framework of Metadata Extraction from Scientific Papers

A Rule-based Framework of Metadata Extraction from Scientifi...

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2011 IEEE 10th International Symposium on Distributed computing and Applications to Business,Engineering(第十届电子商务、工程及科学领域的分布式计算和应用国际学术研讨会 DCABES 2011)

作者： Zhixin Guo Hai Jin Cluster and Grid Computing Lab Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan 430074 China

Most scientific documents on the web are unstructured or semi-structured, and the automatic document metadata extraction process becomes an important task. This paper describes a framework for automatic metadata extraction from scientific papers. Based on a spatial and visual knowledge principle, our system can extract title, authors and abstract from scientific papers. We utilize format information such as font size and position to guide the metadata extraction process. The experiment results show that our system achieves a high accuracy in header metadata extraction which can effectively assist the automatic index creation for digital libraries.

关键词： document metadata information extraction rulebased

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An approach to use cluster-wide free memory in virtual environment

Proceedings - 2011 6th Annual ChinaGrid Conference, ChinaGri...

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Proceedings - 2011 6th Annual ChinaGrid Conference, ChinaGrid 2011 2011年 163-167页

作者： Zhou, Like Wu, Song Shi, Xuanhua Jin, Hai Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769544724

Memory and I/O intensive applications always use a huge amount of memory and the performance decreases quickly when memory pressure arises. With the development of high performance network and widely used in cluster, the latency of remote memory access is much less than that of disk operation. In this paper, we present an approach to let the VM (Virtual Machine) use cluster-wide free memory, which can overcome the limitation of physical memory by exploiting low-latency access to the memory of other nodes in cluster. This approach can reduce the execution time for memory and I/O intensive applications significantly by utilizing cluster-wide memory and increase the whole cluster utilization. © 2011 IEEE.

关键词： Virtualization

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Compound face image retrieval based on vertical web image retrieval

Proceedings - 2011 6th Annual ChinaGrid Conference, ChinaGri...

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Proceedings - 2011 6th Annual ChinaGrid Conference, ChinaGrid 2011 2011年 130-135页

作者： Zheng, Ran Wen, Shilei Zhang, Qin Jin, Hai Xie, Xia Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769544724

Text-based image search engine and content-based image retrieval (CBIR) have achieved much progress in commerce and academic community. In addition, a few attempts have been conducted to integrate the two techniques for image retrieval in web context. However, it is very difficult for general search engine based on image context to return highly accurate results. Compound face image retrieval system, based on a novel vertical web image retrieval framework, is designed to make comprehensive uses of text, image content and some related technologies in face detection and recognition. It incorporates high-level semantics and lowlevel visual features of web image and provides more accurate results and good extensibility for further applications. © 2011 IEEE.

关键词： Search engines

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I/O Scheduling by Using Multi-network Interfaces of Virtualization system

I/O Scheduling by Using Multi-network Interfaces of Virtuali...

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IEEE International Conference on Trust, Security and Privacy in computing and Communications (TrustCom)

作者： Xia Xie Haiqing Zhu Wenzhi Cao Hai Jin Pingpeng Yuan Services Computing Technology and System Laboratory Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

With the development of virtualization technology, it can run more and more guest domains on one single physical machine. So the network I/O demand is also rapidly increasing, for these guest domains can supply more and more services or run more and more applications. This will lead to serious contention on network I/O of physical machine. Although we can use high performance NICs (network interface cards) to improve network I/O performance, one single NIC cannot get further performance improvement which depends on hardware technology. Linux bonding can achieve high bandwidth network by using multiple NICs, but it does not guarantee QoS among guest domains. Also it would terminate one guest domain's communication because of its response mechanism of ARP. Therefore, we present an approach named Virtual Bonding to achieve high bandwidth network by using multi-NICs. It aggregates multi-NICs to provide high bandwidth and high-quality network services. It also introduces load balancing mechanism between multi-NICs. So it can make full use of every NIC. Furthermore, it makes perfect support to virtualization environment.

关键词： Bonding Bridges Bandwidth Load management Servers Linux IP networks

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