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Knowledge granulation in interval-valued information systems

Knowledge granulation in interval-valued information systems

引用

International Workshop on Intelligent systems and Applications

作者： Zhang, Nan Miao, Duoqian Gao, Can Department of Computer Science and Technology Tongji University Shanghai 201804 China Department of Computer Science University of Regina Regina SK S4S 0A2 Canada Key Lab. of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 China Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6R 2G4 Canada

ISBN: (纸本)9781424498574

Rough set theory, proposed by Pawlak, has been proved to be a mathematical tool to deal with vagueness and uncertainty in intelligent information processing. In this paper, we propose the concept of knowledge granulation in interval-valued information systems, and discuss some important properties. From these properties, it can be shown that the proposed knowledge granulation provides important approaches to measuring the discernibility of different knowledge. It may be helpful for rule evaluation and knowledge discovery in interval-valued information systems. © 2011 IEEE.

关键词： Information systems

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Affinity-aware proportional share scheduling for virtual machine system

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

引用

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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SHelp: Automatic self-healing for multiple application instances in a virtual machine environment

SHelp: Automatic self-healing for multiple application insta...

引用

作者： Chen, Gang Jin, Hai Zou, Deqing Zhou, Bing Bing Qiang, Weizhong Hu, Gang Cluster and Grid Computing Lab. Services Computing Technology and System Lab. Huazhong University of Science and Technology Wuhan 430074 China Centre for Distributed and High Performance Computing School of Information Technologies University of Sydney NSW 2006 Australia

ISBN: (纸本)9780769542201

When multiple instances of an application running on multiple virtual machines, an interesting problem is how to utilize the fault handling result from one application instance to heal the same fault occurred on other sibling instances, and hence to ensure high service availab.lity in a cloud computing environment. This paper presents SHelp, a lightweight runtime system that can survive software failures in the framework of virtual machines. It applies weighted rescue points and error virtualization techniques to effectively make applications bypass the faulty path. A two-level storage hierarchy is adopted in the rescue point database for applications running on different virtual machines to share error handling information to reduce the redundancy and to more effectively and quickly recover from future faults caused by the same bugs. A Linux prototype is implemented and evaluated using four web server applications that contain various types of bugs. Our experimental results show that SHelp can make server applications to recover from these bugs in just a few seconds with modest performance overhead. © 2010 IEEE.

关键词： Software reliability

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Power aware resource allocation in virtualized environments through VM behavior identification

Power aware resource allocation in virtualized environments ...

引用

2010 IEEE/ACM International Conference on Green computing and Communications, GreenCom 2010, 2010 IEEE/ACM International Conference on Cyber, Physical and Social computing, CPSCom 2010

作者： Jiang, Congfeng Zhang, Jilin Wan, Jian Xu, Xianghua Yin, Yuyu Yu, Ritai Lv, Changping Grid and Service Computing Technology Lab. Hangzhou Dianzi University Hangzhou 310037 China

ISBN: (纸本)9780769543314

Virtualization technology enables server and service consolidation to save more power and operational costs of large scale computing systems. However, the consolidation nature of virtualization intensifies the power densities in a rack, thus resulting in higher probability of failures and service Level Agreements violations under constrained power budget. In this paper, we proposed a power aware resource allocation algorithm, named PaRA, to coordinate and tradeoff the power and performance. In order to provide enough information about power characteristics of individual VM and applications, we use agent for workload characterization and estimation. The real actuation of resource allocation is realized within the Virtual Machines Monitor (VMM). We evaluated our algorithm on a real Xen based virtualization environments with 3 VMs. The results show that the proposed approach can achieve a higher SLA satisfaction rate as 99.6% in RUBiS web application, and power consumption savings up to 17.6% compared to default Xen resource allocator. The results also show the potential of our algorithm to be used in real virtualization environments. © 2010 IEEE.

关键词： Virtualization

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Java multi threaded based parallel remote sensing image interpretation in desktop grid

Java multi threaded based parallel remote sensing image inte...

引用

5th Annual Chinagrid Conference, Chinagrid 2010

作者： Jiang, Congfeng Xu, Xianghua Wan, Jian Zhang, Jilin Li, Yunfa Grid and Service Computing Technology Lab. Hangzhou Dianzi University Hangzhou 310037 China

ISBN: (纸本)9780769541068

Typical remote sensing image interpretation consists of large number of long-lived independent computation jobs such as calibration, correction, and transformation and computation. These time consuming jobs are suitable for execution in desktop grid with high performance commodity PCs for its lower cost and high management ability. In this paper, a framework of parallel remote sensing image interpretation in desktop grid is proposed. The framework consists of modules such as job partitioning and scheduling, load balancing, communication, and image processing. We also provided an implementation based on java multi threaded programming. The computation results on real application of soil moisture estimation workload show that the average speedup is 6.1 in a 9-node heterogeneous desktop grid environment and failure rate of jobs is less than 5.6%. © 2010 IEEE.

关键词： Scheduling

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An event based GUI programming toolkit for embedded system

An event based GUI programming toolkit for embedded system

引用

2010 IEEE Asia-Pacific services computing Conference, APSCC 2010

作者： Hu, Xu Jiang, Congfeng Zhang, Wei Zhang, Jilin Yu, Ritai Lv, Changping Grid and Service Computing Technology Lab. Hangzhou Dianzi University Hangzhou 310037 China

ISBN: (纸本)9780769543055

Due to various differences in hardware architectures of devices in ubiquitous computing systems, portability and platform-independency become the main challenge for graphics programming in system design. In this paper, we propose an adaptive user interface programming toolkit for system design in ubiquitous computing environment. The toolkit leverages an existing system software infrastructure, making the application programming straightforward and platform independent. This proposed toolkit can be divided into two parts: the first part consists of open source cross-platform graphics libraries which are encapsulated into the platform dependent part of backend library for interacting with specific system. While another one, called core library, is responsible for the functions of control logics, graphics drawing and backend management. To demonstrate the practical use of this toolkit and its portability, a case study is provided for demonstration. The test results on three different embedded systems show its good adaptability on multiplatforms. © 2010 IEEE.

关键词： Embedded systems

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A survey of virtual machine system: Current technology and future trends

A survey of virtual machine system: Current technology and f...

引用

3rd International Symposium on Electronic Commerce and Security, ISECS 2010

作者： Li, Yunfa Li, Wanqing Jiang, Congfeng Grid and Service Computing Lab. School of Computer Science and Technology Hangzhou Dianzi University 310018 Hangzhou China

With the development of the computer technology, the virtual machine has been become the main research topic. Understanding of the current technology and future trends of virtual machine system greatly help to improve the service performance of system. Therefore, we describe the current technology and present the future trends of virtual machine system in the paper. In the current technology of virtual machine system, we mainly describe the virtualization technology, the resource scheduling technology, the migration technology, the security technology and the performance evaluation technology. In the future trends of virtual machine system, we mainly present an overview of the future CPU architecture, the management mode of future memory and resource, the future maintaining method of system security and the performance evaluation method of future multiple virtual machine system. © 2010 IEEE.

关键词： Virtual machine

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A control mechanism about Quality of service for resource scheduling in multiple virtual machine system

A control mechanism about Quality of Service for resource sc...

引用

11th International Conference on Parallel and Distributed computing, Applications and Technologies, PDCAT 2010

作者： Li, Yunfa Xu, Xiangha Wan, Jian Li, Wanqing Grid and Service Computing Lab. School of Computer Science and Technology Hangzhou Dianzi University 310018 Hangzhou China

ISBN: (纸本)9780769542874

With the growth of hardware and software resources, It becomes a challenge that how to ensure the Quality of service (QoS) of resource scheduling in multiple virtual machine system. In order to solve this problem, the authors propose a control mechanism about QoS for resource scheduling. In the control mechanism, we first propose a theoretical model. Then, we present an elicitation algorithm to resolve the optimal model. In order to justify the feasibility and availab.lity of this control mechanism about QoS for resource scheduling in multiple virtual machine system, a series of experiments have been done. The results show that it is feasible to schedule the system resources and control the QoS of system resources for tasks in multiple virtual machine system. © 2010 IEEE.

关键词： Quality of service

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A real-time scheduling mechanism of resource for multiple virtual machine system

A real-time scheduling mechanism of resource for multiple vi...

引用

5th Annual Chinagrid Conference, Chinagrid 2010

作者： Li, Yunfa Xu, Xianghua Wan, Jian Li, Wanqing Yuan, Youwei Grid and Service Computing Lab. School of Computer Science and Technology Hangzhou Dianzi University Hangzhou 310018 China

ISBN: (纸本)9780769541068

With the growth of hardware and software resources, the management of virtual machine system is becoming more and more difficult. It has become a very difficult problem that how to schedule the system resource in real time and improve the service performance of resource in a multiple virtual machine system. In order to solve this problem, the authors propose a real-time scheduling mechanism of resource for multiple virtual machine system. In the real-time scheduling mechanism of resource, the authors first describe the architecture of multiple virtual machine system. Then, the authors present a real-time scheduling strategy of resource. In order to justify the feasibility and the availab.lity of this resource scheduling mechanism, a series of experiments have been done. The results show that it is feasible to schedule the system resources for tasks in multiple virtual machine system. © 2010 IEEE.

关键词： Network security

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VITS test suit: A micro-benchmark for evaluating performance isolation of virtualization systems

VITS test suit: A micro-benchmark for evaluating performance...

引用

International Workshop on Cloud services-Platform Accelerating E-Business

作者： Yuan, Pingpeng Ding, Chong Cheng, Long Li, Shengli Jin, Hai Cao, Wenzhi Service Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769542270

Virtualization technology improves the resource utilization, but also raises the probability of resource contention. Thus, it arises one problem, namely how about performance isolation among VMs. To answer the question, benchmarks are highly required to evaluate performance isolation. However, few benchmarks to give solutions to the problem are availab.e. Especially, there does not exist a micro-benchmark to measure how the performance of individual primitive operations varies with the type of misbehavior. In the paper, we present VITS - a micro-benchmark to evaluate the performance isolation of virtualization system. VITS Test Suite can test both software and hardware performance isolation. It is mainly consisted of six interference programs, which respectively test the performance isolation of cache, memory bandwidth, memory space, CPU, network and disk. VITS Test Suite provides results for user to analyze the performance isolation problem of the virtualization system along with the underlying hardware. Besides, we test Xen using VITS test suit. The experimental results show that, the cache, memory and disk performance isolation still have some big weak points to improve, in other words, the current virtualization system Xen is still unfair in fine-grained resource share. © 2010 IEEE.

关键词： Virtualization

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