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Predicting change propagation in object-oriented systems: A control-call path based approach and associated tool

Predicting change propagation in object-oriented systems: A ...

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20th International Conference on software engineering and Knowledge engineering, SEKE 2008

作者： Badri, Linda Badri, Mourad St-Yves, Daniel Department of Mathematics and Computer Science Software Engineering Research Laboratory University of Quebec at Trois-Rivieres C.P. 500 Trois-Rivières QC G9A 5H7 Canada

ISBN: (纸本)9781627486620

Change impact analysis plays an important role in software maintenance. It allows evaluating the possible effects of a change. We present, in this paper, a static technique supporting predictive change impact analysis for object-oriented systems and associated tool. The technique uses a model based on control-call flow graphs obtained by static analysis. The control-call flow paths, generated in a compacted form from the model, are used to predict change propagation. The technique we present has been compared, according to several criteria (quality of precision and performance), to two static impact analysis techniques (call graph and slicing based techniques). We used several versions of a Java project (JMOL). The results are reported and discussed in the paper. We also give an overview of the environment we developed to support the proposed approach.

关键词： Static analysis

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Autonomic Management of Hybrid Sensor Grid systems and Applications

Autonomic Management of Hybrid Sensor Grid Systems and Appli...

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International Conference on computer Communications and Networks (ICCCN)

作者： Xiaolin Li Xinxin Liu Huanyu Zhao Nanyan Jiang Manish Parashar Department of Computer Science Scalable Software Systems Laboratory Oklahoma State University Stillwater OK USA Department of Electrical & Computer Engineering Applied Software Systems Laboratory Rutgers University NJ USA

In this paper, we propose an autonomic management framework (ASGrid) to address the requirements of emerging large-scale applications in hybrid grid and sensor network systems. To the best of our knowledge, we are the first who proposed the autonomic sensor grid system concept in a holistic manner targeted at non-trivial large applications. To bridge the gap between the physical world and the digital world and facilitate information analysis and decision making, ASGrid is designed to smooth the integration of sensor networks and grid systems and efficiently use both on demand. Under the blueprint of ASGrid, we present several building blocks that fulfill the following major features: (1) Self-configuration through content-based aggregation and associative rendezvous mechanisms; (2) Self-optimization through utility-based sensor selection and model-driven hierarchical sensing task scheduling; (3) Self-protection through ActiveKey dynamic key management and S3Trust trust management mechanisms. Experimental and simulation results on these aspects are presented.

关键词： Sensor systems and applications Content management Grid computing Instruments Sensor phenomena and characterization Resource management Power system management Sensor systems Waste management Application software

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Rescheduling co-allocation requests based on flexible advance reservations and processor remapping

Rescheduling co-allocation requests based on flexible advanc...

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International Workshop on Grid Computing

作者： Marco A. S. Netto Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

Large-scale computing environments, such as TeraGrid, Distributed ASCI Supercomputer (DAS), and Gridpsila5000, have been using resource co-allocation to execute applications on multiple sites. Their schedulers work with requests that contain imprecise estimations provided by users. This lack of accuracy generates fragments inside the scheduling queues that can be filled by rescheduling both local and multi-site requests. Current resource co-allocation solutions rely on advance reservations to ensure that users can access all the resources at the same time. These coallocation requests cannot be rescheduled if they are based on rigid advance reservations. In this work, we investigate the impact of rescheduling co-allocation requests based on flexible advance reservations and processor remapping. The metascheduler can modify the start time of each job component and remap the number of processors they use in each site. The experimental results show that local jobs may not fill all the fragments in the scheduling queues and hence rescheduling co-allocation requests reduces response time of both local and multi-site jobs. Moreover, we have observed in some scenarios that processor remapping increases the chances of placing the tasks of multi-site jobs into a single cluster, thus eliminating the inter-cluster network overhead.

关键词： Time factors Estimation Runtime Schedules Resource management Processor scheduling Supercomputers

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N-Most Interesting Closed Itemset Mining

N-Most Interesting Closed Itemset Mining

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International Conference on Convergence Information Technology

作者： Panida Songram Veera Boonjing Department of Mathematics and Computer Science Faculty of Science King Mongkuts Institute of Technology Ladkrabang Software Systems Engineering Laboratory Bangkok Thailand Department of Computer Science Faculty of Informatics Mahasarakham University Mahasarakham Thailand

In this paper, we propose an efficient algorithm, NCLOSED, for mining the N k-closed itemsets with the highest supports for 1 up to a certain k max value. The algorithm adopts best-first search strategy to generate closed itemsets with highest remaining supports. It does not keep closed itemsets mined in main memory to ensure that they are really closed. This is because this algorithm can directly generate closed itemsets. Moreover, duplicated closed itemsets are detected and discarded from this algorithm.

关键词： Itemsets Data mining computer science Information technology software systems systems engineering and theory Laboratories mathematics Informatics software algorithms

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A Meta-scheduler with Auction Based Resource Allocation for Global Grids

A Meta-scheduler with Auction Based Resource Allocation for ...

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International Conference on Parallel and Distributed systems (ICPADS)

作者： Saurabh Kumar Garg Srikumar Venugopal Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

As users increasingly require better quality of service from grids, resource management and scheduling mechanisms have to evolve in order to satisfy competing demands on limited resources. Traditional schedulers for grids are system centric and favour system performance over increasing userpsilas utility. On the other hand market oriented schedulers are price-based systems that favour users but are based solely on user valuations. This paper proposes a novel meta-scheduler that unifies the advantages of both the systems for benefiting both users and resources. In order to do that, we design a valuation metric for userpsilas applications and computational resources based on multi-criteria requirements of users and resource load. The meta-scheduler maps user applications to suitable distributed resources using a continuous double auction (CDA). Through simulation, we compare our scheduling mechanism against other common mechanisms used by current meta-schedulers. The results show that our meta-scheduler mechanism can satisfy more users than the others while still meeting traditional system-centric performance criteria such as average load and deadline of applications.

关键词： Resource management Processor scheduling Cost accounting Grid computing Computational modeling Environmental economics Laboratories computer science software engineering Quality of service

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Performance analysis of multiple site resource provisioning: effects of the precision of availability information 08

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Proceedings of the 15th international conference on High performance computing

作者： Marcos Dias De Assunção Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering The University of Melbourne Australia and NICTA Victoria Research Laboratory The University of Melbourne Australia Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering The University of Melbourne Australia

ISBN: (纸本)9783540898931

Emerging deadline-driven Grid applications require a numberof computing resources to be available over a time frame, startingat a specific time in the future. To enable these applications, it is importantto predict the resource availability and utilise this informationduring provisioning because it affects their performance. It is impracticalto request the availability information upon the scheduling of everyjob due to communication overhead. However, existing work has notconsidered how the precision of availability information influences theprovisioning. As a result, limitations exist in developing advanced resourceprovisioning and scheduling mechanisms. This work investigateshow the precision of availability information affects resource provisioningin multiple site environments. Performance evaluation is conductedconsidering both multiple scheduling policies in resource providers andmultiple provisioning policies in brokers, while varying the precision ofavailability information. Experimental results show that it is possible toavoid requesting availability information for every Grid job scheduledthus reducing the communication overhead. They also demonstrate thatmultiple resource partition policies improve the slowdown of Grid jobs.

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Market-Oriented Cloud Computing: Vision, Hype, and Reality for Delivering IT Services as Computing Utilities

Market-Oriented Cloud Computing: Vision, Hype, and Reality f...

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

作者： Rajkumar Buyya Chee Shin Yeo Srikumar Venugopal Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

This keynote paper: presents a 21 st century vision of computing; identifies various computing paradigms promising to deliver the vision of computing utilities; defines Cloud computing and provides the architecture for creating market-oriented Clouds by leveraging technologies such as VMs; provides thoughts on market-based resource management strategies that encompass both customer-driven service management and computational risk management to sustain SLA-oriented resource allocation; presents some representative Cloud platforms especially those developed in industries along with our current work towards realising market-oriented resource allocation of Clouds by leveraging the 3rd generation Aneka enterprise Grid technology; reveals our early thoughts on interconnecting Clouds for dynamically creating an atmospheric computing environment along with pointers to future community research; and concludes with the need for convergence of competing IT paradigms for delivering our 21 st century vision.

关键词： Meteorology Cloud computing Resource management Grid computing Quality of service Industries Monitoring

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A Linear Programming Driven Genetic Algorithm for Meta-Scheduling on Utility Grids

A Linear Programming Driven Genetic Algorithm for Meta-Sched...

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International Conference on Advanced Computing and Communications (ADCOM)

作者： Saurabh Garg Pramod Konugurthi Rajkumar Buyya Department of Computer Science and Software Engineering Grid Computing and Distributed Systems Laboratory CSSE University of Melbourne Australia

The user-level brokers in grids consider individual application QoS requirements and minimize their cost without considering demands from other users. This results in contention for resources and sub-optimal schedules. Meta-scheduling in grids aims to address this scheduling problem, which is NP hard due to its combinatorial nature. Thus, many heuristic-based solutions using genetic algorithm (GA) have been proposed, apart from traditional algorithms such as greedy and FCFS. We propose a Linear Programming/Integer Programming model (LP/IP) for scheduling these applications to multiple resources. We also propose a novel algorithm LPGA (linear programming driven genetic algorithm) which combines the capabilities of LP and GA. The aim of this algorithm is to obtain the best meta-schedule for utility grids which minimize combined cost of all users in a coordinated manner. Simulation results show that our proposed integrated algorithm offers the best schedule having the minimum processing cost with negligible time overheard.

关键词： Linear programming Genetic algorithms Costs Processor scheduling Grid computing Scheduling algorithm Laboratories computer science software engineering Application software

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A Negotiation Mechanism for Advance Resource Reservations Using the Alternate Offers Protocol

A Negotiation Mechanism for Advance Resource Reservations Us...

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International Workshop on Quality of Service

作者： Srikumar Venugopal Xingchen Chu Rajkumar Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

ISBN: (纸本)9781424420841

Service level agreements (SLAs) between grid users and providers have been proposed as mechanisms for ensuring that the users' quality of service (QoS) requirements are met, and that the provider is able to realise utility from its infrastructure. This paper presents a bilateral protocol for SLA negotiation using the alternate offers mechanism wherein a party is able to respond to an offer by modifying some of its terms to generate a counter offer. We apply this protocol to the negotiation between a resource broker and a provider for advance reservation of compute nodes, and implement and evaluate it on a real grid system.

关键词： Protocols Resource management Contracts Grid computing Quality of service Counting circuits Proposals Streaming media computer architecture Laboratories

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Service and Utility Oriented Distributed Computing systems: Challenges and Opportunities for Modeling and Simulation Communities

Service and Utility Oriented Distributed Computing Systems: ...

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Annual Symposium on Simulation

作者： Rajkumar Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

Summary form only given. Grids and peer-to-peer (P2P) networks have emerged as popular platforms for the next generation parallel and distributed computing. In these environments, resources are geographically distributed, managed and owned by various organizations with different policies, and interconnected by wide-area networks or the Internet. This introduces a number of resource management and application scheduling challenges in the domain of security, resource and policy heterogeneity, fault tolerance, and dynamic resource conditions. In these dynamic distributed computing environments, it is hard and challenging to carry out resource management design studies in a repeatable and controlled manner as resources and users are autonomous and distributed across multiple organizations with their own policies. Therefore, simulations have emerged as the most feasible technique for analyzing policies for resource allocation. This paper presents emerging trends in distributed computing and their promises for revolutionizing the computing field, and identifies distinct characteristics and challenges in building them. We motivate opportunities for modeling and simulation communities and present our discrete-event grid simulation toolkit, called GridSim, used by researchers world-wide for investigating the design of utility-oriented computing systems such as data centers and grids. We present various case studies on the use of GridSim in modeling and simulation of business grids, parallel applications scheduling, workflow scheduling, and service pricing and revenue management.

关键词： Distributed computing Computational modeling Resource management Processor scheduling Peer to peer computing Next generation networking computer network management Environmental management IP networks Dynamic scheduling

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