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2011 International Conference on Information and Intelligent computing（ICIIC 2011）

作者： Jaeyong Kang Kwang Mong Sim Multiagent and Cloud Computing Systems Lab. Department of Information and Communication Gwangju Institute of Science and Technology (GIST) Gwangju Korea

Cloud computing has become another buzzword after Web 2.0. Many companies, such as Amazon, Google, Microsoft and so on, accelerate their paces in developing Cloud computing systems. However, there is no study that focuses on search engine and web portal for Cloud computing system. Hence, this paper presents Cloud portal with various service categories and Cloud service search engine for Cloud computing system. In Cloud service search engine, we use Cloud ontology to semantically define the relationship among Cloud services. It contains a set of Cloud concepts, individuals of those concepts, and the relationship among those individuals. It is used for determining the similarity among Cloud services with three kinds of reasoning methods (1) concept similarity reasoning, (2) object property similarity reasoning, and (3) datatype property similarity reasoning. The interface and features of the Cloud portal are briefly presented. Finally a proof-of-concept-example demonstrates the features and functionalities of our Cloud portal and Cloud search engine.

关键词： Cloud computing Cloud Portal Search Engines Cloud Ontology

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2011年 7084 LNCS卷 V-VI页

作者： Kappel, Gerti Maamar, Zakaria Motahari-Nezhad, Hamid R. Vienna University of Technology Institute of Software Technology and Interactive Systems Favoritenstraße 9-11/188 1040 Vienna Austria Zayed University College of Information Technology P.O. Box 19282 Dubai United Arab Emirates HP Labs. Services Research Lab. 1501 Page Mill Road Palo Alto CA 94304 United States

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MR-Scope: A real-time tracing tool for MapReduce 10

MR-Scope: A real-time tracing tool for MapReduce

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Proceedings of the 19th ACM International Symposium on High Performance Distributed computing

作者： Huang, Dachuan Shi, Xuanhua Ibrahim, Shadi Lu, Lu Liu, Hongzhang Wu, Song Jin, Hai Cluster and Grid Computing Lab. Services Computing Technique and System Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781605589428

MapReduce programming model is emerging as an efficient tool for data-intensive applications. Hadoop, an open-source implementation of MapReduce, has been widely adopted and experienced by both academia and enterprise. Recently, lots of efforts have been done on improving the performance of MapReduce system and on analyzing the MapReduce process based on the log files generated during the Hadoop execution. Visualizing log files seems to be a very useful tool to understand the behavior of the Hadoop process. In this paper, we present MRScope, a real-time MapReduce tracing tool. MR-Scope provides a real-time insight of the MapReduce process, including the ongoing progress of every task hosted in Task Tracker. In addition, it displays the health of the Hadoop cluster data nodes, the distribution of the file system's blocks and their replicas and the content of the different block splits of the file system. We implement MR-Scope in native Hadoop 0.1. Experimental results demonstrat that MR-Scope's overhead is less than 4% when running wordcount benchmark. Copyright 2010 ACM.

关键词： MapReduce

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Xenrelay: An efficient data transmitting approach for tracing guest domain

Xenrelay: An efficient data transmitting approach for tracin...

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2nd IEEE International Conference on Cloud computing technology and Science, CloudCom 2010

作者： Jin, Hai Cao, Wenzhi Yuan, Pingpeng Xie, Xia Cluster and Grid Computing Lab. Services Computing Technique and System Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769543024

As the degree of virtualization is growing considerably, improving performance of virtual machine environments motivates deeper investigation of the internal processes and performance implications of virtualization. Several tools are currently availab.e to help analyze performance in virtual machine environments. However, all of these cannot support users to add their own trace information. In this paper, we present Xenrelay, a unified, efficient, and simple mechanism for transferring large amounts of data from guest domain kernel to privileged domain user-space. Xenrelay allows users (who trace subsystems of guest domain to analyze performance) to record and fast relay data between domains. We provide a case of Xenrelay's value in revealing behavior of virtualization. We build a block trace toolkit (using Xenrelay as an engine). This toolkit is used to track the block I/O virtualization procedures and evaluates overheads in the Xen environment. Our trace results identify that the main delay is the time of request transmission and block device operation. Besides, the results reveal impact of the I/O schedules on the disk performance. © 2010 IEEE.

关键词： Virtualization

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Affinity-aware proportional share scheduling for virtual machine system

Affinity-aware proportional share scheduling for virtual mac...

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International Conference on Grid and Cloud computing

作者： Chen, Huacai Jin, Hai Hu, Kan Services Computing Technology and System Lab. Cluster and Grid Computing Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769543130

VM (virtual machine) scheduling is a fundamental topic of virtualization, and fairness is its important design goal. Most VMMs (virtual machine monitor) provide PS (proportional share) schedulers. A PS scheduler assign a weight to every VM to declare the computational resource requirement, and VM is allocated CPU cycles proportional to weight. CPU-affinity is a property of VCPU (virtual CPU) to describe which PCPUs (physical CPU) it can run on. However, current definition of weight does not collab.rate well with CPU-affinity. It behaves as if all PCPUs are availab.e to all VMs. We expose the issue by using Xen's Credit scheduler, and show that CPU cycles can be fairly allocated to VMs in the default free-mapping case (no affinity restriction), but not so in restricted-mapping cases (when affinities are configured). This fairness issue makes it necessary to extend the meaning of weight, so as to reflect the resource requirements in all cases. In this paper we reconcile the meaning of a domain's weight with CPU-affinity, and improve Credit scheduler as an affinity-aware one. Experimental results show that our affinity-aware proportional share scheduler (named Credit-APS scheduler) brings a good fairness both in free-mapping and restricted-mapping cases. © 2010 IEEE.

关键词： Mapping

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Benchmark object for virtual machines

Benchmark object for virtual machines

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2nd International Workshop on Education technology and Computer Science, ETCS 2010

作者： Xie, Xia Chen, Qingcha Cao, Wenzhi Yuan, Pingpeng 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)9780769539874

The most cost effective approach to study the performance of virtualization technology is to use the benchmark. In this paper, we present a new evaluation methodology to deploy a benchmark evaluation with a Benchmark Object. By encapsulating three steps of traditional benchmark processes and implementing an instance from a Benchmark Object, users need not evaluate manually. Furthermore, a Benchmark Object simplifies the use of benchmarks and saves a great deal of duplicate work to deploy, configure and execute benchmarks and analyze their results. We develop the virtualization system performance evaluation management facility to implement and manage the concept of a Benchmark Object. We discuss this performance evaluation tool in detail, test the performance of the tool, and draw some conclusions. © 2010 IEEE.

关键词： Virtual machine

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XenMVM: Exploring potential performance of multi-core system in virtual machine environment

XenMVM: Exploring potential performance of multi-core system...

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International Conference on Ubiquitous Information Technologies and Applications

作者： Shao, Zhiyuan Huang, Jian Jin, Hai Hu, Kan Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424488124

In this work, we propose computing resource management system based on Xen VMM and multi-core system, called XenMVM. It adjusts the computing resource dynamically according to the actual workload generated by the applications running in the virtual machine to improve the resource utilization of the computer system. According to the shared L2 cache architecture of multi-core system, we propose the Underlying Layout Aware Scheduling (ULAS) which can schedule the virtual CPUs of virtual machines to the appropriate physical CPUs. The test result shows that ULAS can improve the performance about 4.5%-32.52%. Furthermore, to improve the whole performance of multiple virtual machines and meet the needs of specific jobs (i.e., urgent and I/O intensive) deployed in the virtual machines, a simplified method called Domain-based static priority is adopted in XenMVM. Using case studies we show that our proposal reduces the turnover time of the whole system by 20.45% compared with FCFS scheduling scheme. ©2010 IEEE.

关键词： Virtual machine

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MISM: Modelica-based interactive scheduling mechanism for virtual educational experiments

MISM: Modelica-based interactive scheduling mechanism for vi...

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5th Annual ChinaGrid Conference, ChinaGrid 2010

作者： Jiang, Wenbin Tang, Zhen Jin, Hai Liu, Chao Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769541068

Different virtual educational experiments (VEEs) have different frameworks and implementations in different disciplines. How to integrate different VEEs into one unified supporting platform is a challenging problem. The key problem of this integration is how to build a unified mathematical model for VEEs of diversified disciplines. However, most existing multi-domain uniform modeling (MDUM) approaches such as Modelica are research-oriented and lack of real time interaction, which does not meet the requirement of virtual experiments that are user-oriented and highly interactive. To tackle above problem, a Modelica-based interactive scheduling mechanism (MISM) for VEE is proposed. In MISM, user-oriented interaction is based on a best step length algorithm and an interactive event step algorithm. The throughput is considered in the former and the real time interaction is resolved by the latter. Experimental results shows that the approaches presented can meet the requirements of VEEs efficiently. © 2010 IEEE.

关键词： Scheduling

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Adaptive audio-aware scheduling in Xen virtual environment

Adaptive audio-aware scheduling in Xen virtual environment

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2010 ACS/IEEE International Conference on Computer systems and Applications, AICCSA 2010

作者： Chen, Huacai Jin, Hai Hu, Kan Yuan, Minhao Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424477159

With the development of client virtualization technology, it has become an important tendency to apply soft real-time applications in virtual environment. Currently, most schedulers in VMM (i.e., virtual machine monitor) take the fairly sharing of processor resources and load balancing as a main concern, while show less regard to application diversity and I/O responsiveness. This would be unable to meet the requirement for latency-sensitive tasks, such as audio application. Audio stream may suffer from severe input buffer overrun or output buffer underrun, especially in the case that there is no real-time guarantee on virtualized clients under heavy load. In this paper, we introduce experiments to illustrate that current scheduler in Xen does a poor job in guaranteeing fluent audio playing, and then formulate the fluent playing conditions a scheduler should satisfy. A scheduling strategy with soft real-time support is proposed to improve the responsiveness of latency-sensitive guests. To implement our proposition, we extend the Credit scheduler by using flexible time slice and real-time priority. Our solution is audio-aware and capable of adjusting the real-time priority of guest domains adaptively, achieving a better experience for end-users. The experimental results show that audio glitches can be completely eliminated via our extended scheduler even when the system load is very high.

关键词： Virtual reality

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Meld: A real-time message logic debugging system for distributed systems

Meld: A real-time message logic debugging system for distrib...

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2010 IEEE Asia-Pacific services computing Conference, APSCC 2010

作者： Tu, Xuping Jin, Hai Fan, Xuepeng Ye, Jiang Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769543055

The largest difference between a distributed and a non-distributed system is that the former introduces network messages to the system. Network messages bring the scalab.lity to a distributed system as well as complexity to it. Testing large-scale distributed systems is a great challenge, because some errors happen after a distributed sequence of events that involves machine and network failures. Meld is a checker that allows developers to specify expected message logic on a deployed distributed system, and that verifies these logics while the system is running. When Meld finds a problem it starts collecting more information that led to the problem, allowing developers to quickly find the root cause. Developers write message logics on Meld and Meld verifies them through analyzing the collected abstract of messages. By using binary instrumentation, Meld works almost transparently with debugged systems and can change logics to be checked at runtime. An evaluation with a deployed system shows that Meld can detect non-trivial correctness at runtime. © 2010 IEEE.

关键词： Program debugging

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