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RTRM: A response time-based replica management strategy for cloud storage system

引用

8th International Conference on grid and Pervasive computing, GPC 2013

作者： Bai, Xiaohu Jin, Hai Liao, Xiaofei Shi, Xuanhua Shao, Zhiyuan Services Computing Technology and System Lab. Cluster and Grid Computing Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783642380266

Replica management has become a hot research topic in storage systems. This paper presents a dynamic replica management strategy based on response time, named RTRM. RTRM strategy consists of replica creation, replica selection, and replica placement mechanisms. RTRM sets a threshold for response time, if the response time is longer than the threshold, RTRM will increase the number of replicas and create new replica. When a new request comes, RTRM will predict the bandwidth among the replica servers, and make the replica selection accordingly. The replica placement refers to search new replica placement location, and it is a NP-hard problem. Based on graph theory, this paper proposes a reduction algorithm to solve this problem. The simulation results show that RTRM strategy performs better than the five built-in replica management strategies in terms of network utilization and service response time. © 2013 Springer-Verlag.

关键词： Graph theory

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DDASTM: Ensuring conflict serializability efficiently in distributed STM

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8th International Conference on grid and Pervasive computing, GPC 2013

作者： Zhang, Yu Jin, Hai Liao, Xiaofei Services Computing Technology and System Lab. Cluster and Grid Computing Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783642380266

CS (Conflict Serializability) is a recently proposed relaxer correctness criterion that can increase transactional memory's parallelism. DDA (Distributed Dependency-Aware) model is currently proposed to implement CS in distributed STM (Software Transactional Memory) for the first time. However, its transactions detect conflicts individually via detecting cycles in PG (Precedence Graph) and cause extra runtime overhead, especially at the condition that the transactions access lots of objects or the PG is large. In this paper, we propose an approach to make each cycle in PG detected by those transactions, which construct this cycle, together in parallel way, instead of detecting cycle individually. Experimental results show that the average execution time and communication cost of all transactions, including aborted ones, in our approach, can be decreased to 76% and 78% of those in DDA respectively. Its speedup is up to 2.56x against baseDSTM, employing two-phase locking. © 2013 Springer-Verlag.

关键词： Locks (fasteners)

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Resource allocation in contending virtualized environments through stochastic virtual machine performance modeling and feedback

Resource allocation in contending virtualized environments t...

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作者： Jiang, Cong-Feng Wan, Jian Xu, Xiang-Hua Zhang, Ji-Lin You, Xin-Dong Grid and Services Computing Technology Lab Hangzhou Dianzi University Hangzhou 310037 China

In virtualized systems, allocation and scheduling of resources shared among multiple virtual machines faces challenges such as autonomy, isolation and high workload dynamics. The multiplexing and consolidation nature of virtualized systems also raise issues such as interference and conflicts among various virtual machine instances. Therefore traditional resource allocation strategy can't achieve good performance without modifications according to these particular characteristics in virtualized systems. In this paper we use a stochastic model to characterize the resources (especially CPU) and workload dynamics. Then we use a weighted priority based service differentiation strategy to allocate resources in contending conditions to provide performance guarantees as well as load balance and fairness. In the proposed algorithms user behavior and workloads are characterized through the historical and real time performance profiling and estimation from hosted agents within individual Virtual Machines. The resources are allocated according to the demand as well as the performance of the targeted Virtual Machines based on the Sufferage aggregation and performance feedback. Experiments on a real Xen based virtualization environment with 20 Virtual Machines are conducted and evaluated for accuracy, efficiency, sensitivity, and overhead. The results show that the performance feedback based allocation can achieve a higher SLA satisfaction rate as 97.1%, a lower load imbalance index as 18.7%. The performance feedback based allocator uses 14.06% less CPU time for CPU-intensive applications and reduces 45.59% I/O wait time in disk contention environments. The results also show that the feedback based algorithm is valid, effective and scalable for implementation in real virtualized environments.

关键词： Virtual machine

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Supporting parallel soft real-time applications in virtualized environment

Supporting parallel soft real-time applications in virtualiz...

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22nd ACM International Symposium on High-Performance Parallel and Distributed computing, HPDC 2013

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

ISBN: (纸本)9781450319102

The prevalence of multicore processors and virtualization technology enables parallel soft real-time applications to run in virtualized environment. However, current hypervisors do not provide adequate support for them because of soft real-time constraints and synchronization problems, which result in frequent deadline misses and serious performance degradation. In this paper, we propose a novel parallel soft real-time scheduling algorithm which addresses them well, and implement a parallel soft real-time scheduler, named Poris, based on Xen. Our evaluation shows that Poris shortens the execution time of PARSEC benchmark by up to 44.12% compared to Credit scheduler. © 2013 Authors.

关键词： Virtualization

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Vehicle Tracking with Non-overlapping Views for Multi-camera Surveillance System

Vehicle Tracking with Non-overlapping Views for Multi-camera...

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

作者： Wenbin Jiang Chang Xiao Hai Jin Shuo Zhu Zhiwei Lu Services Computing Technology and System Lab Cluster and Grid Computing Huazhong University of Science and Technology Wuhan China

With the rapid development of intelligent video surveillance system for transportation, traditional single-camera-based video analysis has become insufficient. Many researches have focused on the non-overlapping multi-camera target tracking. However, the tracking precision and the computing overhead are still big obstacles. This paper proposes a novel vehicle tracking approach for non-overlapping multi-camera targets with data fusion by using minimum cost and maximum flow method. Structured information of moving targets is extracted and associated with other information such as motion time, the topology of camera network to solve targeted vehicle tracks. Besides, to improve the performance of the process, a parallelization algorithm for camera network topology partitioning is presented, which makes it possible for each sub-graph to track target independently in parallel. The experiment results show that the presented approach is able to perform target vehicle tracking analysis with high efficiency and accuracy.

关键词： Cameras Target tracking Vehicles Feature extraction Network topology Topology

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Exploiting Spatial Locality to Improve Disk Efficiency in Virtualized Environments

Exploiting Spatial Locality to Improve Disk Efficiency in Vi...

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International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS)

作者： Xiao Ling Shadi Ibrahim Hai Jin Song Wu Songqiao Tao Cluster and Grid Computing Lab Services Computing Technology Huazhong University of Science and Technology Wuhan China INRIA Rennes - Bretagne Atlantique Rennes France

Virtualization has become a prominent tool in data centers and is extensively leveraged in cloud environments: it enables multiple virtual machines (VMs) - with multiple operating systems and applications - to run within a physical server. However, virtualization introduces the challenging issue of preserving the high disk utilization (i.e., reducing the seek delay and rotation overhead) when allocating disk resources to VMs. Exploiting spatial locality, a key technique for improving disk utilization and performance, faces additional challenges in the virtualized cloud because of the transparency feature of virtualization (hyper visors do not have the information about the access patterns of applications running within each VM). To this end, this paper contributes a novel disk I/O scheduling framework, named Pregather, to improve disk I/O efficiency through exposure and exploitation of the special spatial locality in the virtualized environment (regional and sub-regional spatial locality corresponds to the virtual disk space and applications' access patterns, respectively), thereby improving the performance of disk-intensive applications without harming the transparency feature of virtualization (without a priori knowledge of the applications' access patterns). The key idea behind Pregather is to implement an intelligent model to predict the access regularity of sub-regional spatial locality for each VM. We implement the Pregather disk scheduling framework and perform extensive experiments that involve multiple simultaneous applications of both synthetic benchmarks and a MapReduce application on Xen-based platforms. Our experiments demonstrate the accuracy of our prediction model and indicate that Pregather results in the high disk spatial locality and a significant improvement in disk throughput and application performance.

关键词： Virtual machine monitors Virtualization Predictive models Analytical models Prediction algorithms Data models Throughput

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Cloud Based Mobile Video Editing System

Cloud Based Mobile Video Editing System

引用

International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Linchen Yu Xiaofei Liao School of Computer China University of Geosciences Wuhan China Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479934300

Mobile video editing systems need efficient streaming transmission and interactive operations. Rather than using a specialized protocol and stream format, the video editing system makes use of a generic mechanism based on chunks in the cloud computing environment. Chunks are in fixed-size and contains a mixture of scalar data and references to other chunks. Chunks allow programmers to expose large, but fine-grained, data structures over the network. The video editing system organizes video clips with simple data types including linked lists and search trees, allowing a client to retrieve. The mobile video editing system supports resource adaptive play-back and "live" streaming of real-time video as well as fast, frame-accurate seeking, bandwidth-efficient high-speed play-back, and compilation of editing decisions from a set of clips. All the editing functions are completed in the cloud center and the editing results are showed on the mobile devices. Evaluations indicate that our system uses less bandwidth than HTTP Live Streaming while providing better support for editing primitives.

关键词： Streaming media Servers Mobile communication Media Protocols Data structures Context

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CloudWeb: A Cloud Based Webpage Transforming for Mobile Devices

CloudWeb: A Cloud Based Webpage Transforming for Mobile Devi...

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Linchen Yu Xiaofei Liao School of Computer China University of Geosciences Wuhan China Cluster and Grid Computing Lab Hauzhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479934300

Mobile devices have already been widely used to access the Web. However, because most available web pages are designed for desktop PC, it is inconvenient to browse these large web pages on a mobile device with a small screen. In this paper, we propose a new web page transforming scheme to facilitate navigation on a small-form-factor device based on cloud computing. Different with other existing schemes, our approach is based on page segmentation and template-rendering. The semantic structure of a web page is extracted by DOM (Document Object Model) analyzing. Such semantic structure is hierarchical. Each node is corresponded to a block area of one web page and is in charge of reconstructing the whole web page. According to different content styles, the template-rendering scheme generates different display modes. Experimental results show good experience.

关键词： Mobile communication Sorting Web pages Mobile handsets Layout Browsers Internet

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Accelerating GPGPU architecture simulation

Accelerating GPGPU architecture simulation

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2013 ACM SIGMETRICS International Conference on Measurement and Modeling of Computer Systems, SIGMETRICS 2013

作者： Yu, Zhibin Eeckhout, Lieven Goswami, Nilanjan Li, Tao John, Lizy K. Jin, Hai Xu, Chengzhong Shenzhen Institute of Advanced Technology Chinese Academy of Sciences China ELIS Department Ghent University Belgium Intelligent Design of Efficient Architectures Lab. University of Florida Gainesville FL United States Department of Electrical and Computer Engineering University of Texas Austin TX United States Service Computing Technologies and System Lab./Cluster and Grid Computing Lab. HUST Wuhan China Department of Electrical and Computer Engineering Wayne State University MI United States

ISBN: (纸本)9781450319003

Recently, graphics processing units (GPUs) have opened up new opportunities for speeding up general-purpose parallel applications due to their massive computational power and up to hundreds of thousands of threads enabled by programming models such as CUDA. However, due to the serial nature of existing micro-architecture simulators, these massively parallel architectures and workloads need to be simulated sequentially. As a result, simulating GPGPU architectures with typical benchmarks and input data sets is extremely time-consuming. This paper addresses the GPGPU architecture simulation challenge by generating miniature, yet representative GPGPU kernels. We first summarize the static characteristics of an existing GPGPU kernel in a profile, and analyze its dynamic behavior using the novel concept of the divergence flow statistics graph (DFSG). We subsequently use a GPGPU kernel synthesizing framework to generate a miniature proxy of the original kernel, which can reduce simulation time significantly. The key idea is to reduce the number of simulated instructions by decreasing per-thread iteration counts of loops. Our experimental results show that our approach can accelerate GPGPU architecture simulation by a factor of 88X on average and up to 589X with an average IPC relative error of 5.6%.

关键词： Graphics processing unit

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Genome-wide identification and analysis of MAPK and MAPKK gene families in Brachypodium distachyon

Genome-wide identification and analysis of MAPK and MAPKK ge...

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第十四届全国植物基因组学大会

作者： Lihong Chen Yang Zhang Yuan He Wei Hu Shenglong Tan Min Wang Shiyi Zhou Xiaomin Deng Chao Huang Kexiu Li Junli Chang Mingjie Chen Yuesheng Wang Guangxiao Yang Guangyuan He The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology Key Laboratory of Molecular Biophysics of Chinese Ministry of EducationCollege of Life Science and TechnologyCollege of Life Science and TechnologyHuazhong University of Science & Technology(HUST) Services Computing Technology and System Laboratory Cluster and Grid Computing LaboratorySchool of Computer Science and TechnologyHuazhong University of Science & Technology(HUST)

Mitogen-activated protein kinase(MAPK) cascade,consisting of three Ser/Thr protein kinases,namely,MAPKKK,MAPKK and MAPK,is a universal module in signal transduction pathways in *** proteins have been implicated in diverse cellular processes including cell growth,proliferation,differentiation,survival, development and in responses to a diversity of environmental stimuli including cold, heat,reactive oxygen species,UV,drought and pathogen attack.

关键词： Brachypodium distachyon MAPK MAPKK phylogenetic analysis yeast two hybrid expression profile

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