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International Conference on Parallel Processing (ICPP)

作者： M. Venkateswara Reddy A. Vijay Srinivas Tarun Gopinath D. Janakiram Department of Computer Science & Engineering Distributed and Object Systems Laboratory Chennai India

The abundant computing resources available on the Internet has made grid computing over the Internet a viable solution, to scientific problems. The dynamic nature of the Internet necessitates dynamic reconfigurability of applications to handle failures and varying loads. Most of the existing grid solutions handle reconfigurability to a limited extent. These systems lack appropriate support to handle the failure of key-components, like coordinators, essential for the computational model. We propose a two layered peer-to-peer middleware, Vishwa, to handle reconfiguration of the application in the face of failure and system load. The two-layers, task management layer and reconfiguration layer, are used in conjunction by the applications to adapt and mask node failures. We show that our system is able to handle the failures of the key-components of a computation model. This is demonstrated in the case studies of two computational models, namely bag of tasks and connected problems, with an appropriate example for each

关键词： Middleware Grid computing Peer to peer computing Internet Computational modeling computer networks IP networks Scalability Routing computer architecture

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Focus group report: Capturing architectural knowledge with architectural patterns

Focus group report: Capturing architectural knowledge with a...

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11th European Conference on Pattern Languages of Programs, EuroPLoP 2006

作者： Harrison, Neil B. Avgeriou, Paris Zdun, Uwe Department of Computer Science and Engineering Utah Valley State College Orem UT United States Department of Mathematics and Computing Science University of Groningen Groningen Netherlands Distributed Systems Group Information Systems Institute Vienna University of Technology Vienna Austria

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distributed wisdom: Designing a replication service for large peer-to-peer data grids

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IEEE distributed systems Online 2006年第3期7卷 25-30页

作者： Srinivas, A. Vijay Reddy, M. Venkateswara Janakiram, D. Indian Institute of Technology Madras India Distributed and Object Systems Lab. Department of Computer Science and Engineering Indian Institute of Technology Madras India Department of Computer Science and Engineering Indian Institute of Technology Madras India

Some of the key issues in building services for large scale distributed systems, realizing Vishwa, a peer-to-peer (P2P) middleware architecture for developing grid applications are discussed. Researchers are producing large amounts of scientific data and believe that distributed computations on the data must be scheduled and available to a large number of scientists. It is suggested that the platform must scale up to a large number of nodes and data units in the system and must also be scalable geographically. A scalable, reconfigurable shared-object space over the two-layer architecture can be developed that incorporates mechanisms to maintain replicated data and must also provide a shared-object abstraction over a wide-area distributed system.

关键词： distributed computer systems

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Eliminating execution overhead of disabled optional features in connectors 1

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3rd European Workshop on Software Architecture, EWSA 2006

作者： Bulej, LubomÍr Bure Š, TomÁš Distributed Systems Research Group Department of Software Engineering Charles University Malostranské nám. 25 Prague118 00 Czech Republic Institute of Computer Science Academy of Sciences of the Czech Republic Pod Vodárenskou věží 2 Prague182 07 Czech Republic

ISBN: (数字)9783540692720

ISBN: (纸本)9783540692713

Connectors are used to realize component interactions in component systems. Apart from their primary function, which is mediating the communication, their implementation can also support additional features that, while unrelated to the primary function, may benefit from their placement in connectors. Such features are often optional in the sense that they can be activated and deactivated at run-time. The problem is that even if they are disabled, their very presence in the connector incurs certain overhead. In this paper, we describe an approach to eliminate this overhead by reconfiguration of the connector implementation. Besides connectors, the approach is applicable to similar technologies such as reflective middleware and other architecture-based component systems and frameworks. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Middleware

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Combining Probabilistic Ranking and Latent Semantic Indexing for Feature Identification

Combining Probabilistic Ranking and Latent Semantic Indexing...

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IEEE Workshop on Program Comprehension

作者： D. Poshyvanyk A. Marcus V. Rajlich Y.-G. Gueheneuc G. Antoniol Department of Computer Science Wayne State University Detroit MI USA GEODES-Research Group on Open Distributed Systems Experimental Software Engineering University of Montreal Canada Department of Mathematics and Computer Science Babeş-Bolyai University Cluj-Napoca Romania Département de Génie Informatique École Polytechnique de Montréal Canada

The paper recasts the problem of feature location in source code as a decision-making problem in the presence of uncertainty. The main contribution consists in the combination of two existing techniques for feature location in source code. Both techniques provide a set of ranked facts from the software, as result to the feature identification problem. One of the techniques is based on a scenario based probabilistic ranking of events observed while executing a program under given scenarios. The other technique is defined as an information retrieval task, based on the latent semantic indexing of the source code. We show the viability and effectiveness of the combined technique with two case studies. A first case study is a replication of feature identification in Mozilla, which allows us to directly compare the results with previously published data. The other case study is a bug location problem in Mozilla. The results show that the combined technique improves feature identification significantly with respect to each technique used independently

关键词： Indexing computer science Software engineering Information retrieval Information analysis Data mining Decision making Uncertainty Software debugging Software systems

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Roles:From objects, security and databases perspective

Roles:From objects, security and databases perspective

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2005 AAAI Fall Symposium

作者： Chandra Sekharaiah, Kangaluru Janaki Ram, D. Distributed Object Systems Group Department of Computer Science and Engg. JNTU College of Engineering Hyderabad India Distributed Object Systems Lab. Department of Computer Science and Engg. Indian Institute of Technology Madras

ISBN: (纸本)1577352548

A role paradigm conformance model (RPCM) called Typehole model was developed and implemented in Java. It does not use Is-role-of inheritance and is free from the object schizophrenia (OS) problem (OSP). An extended distributed role model provides multifarious role hierarchies at different sites. Modeling object role systems is prone to OSP. OSP is the error in the RPCM design to subscribe to the viewpoints in the client space. OS and OSP are contrasted. A classification of OSPs is made. Role modeling problem is the requirement to design an OSP-free RPCM with Is-role-of inheritance. The existing object-oriented role models have been evaluated as regards OSP. No role model has strong claims as regards solving the role modeling problem. A security model was developed for RPCM-based distributed object systems and implemented on CORBA. By designing message filter hierarchies, hybrid security is developed at global and local levels for RPCM-based object systems. Role is either abstract or concrete as it can be a type or an instance. Copyright © 2005, American Association for Artificial Intelligence (***). All rights reserved.

关键词： Database systems

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A Simple Model for Evaluating the Scalability in Wireless Sensor Networks

A Simple Model for Evaluating the Scalability in Wireless Se...

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Intelligent Sensors, Sensor Networks and Information Processing Conference (ISSNIP)

作者： R. Venkateswarlu D. Janakiram Distributed and Object Oriented Systems Lab Department of Computer Science and Engineering IIT Madras Chennai India

Recent advances in wireless technology have enabled the rapid development of wireless sensor networks. Such networks, consisting of ten to thousands of randomly deployed nodes collaborating to achieve a goal, are used in a variety of applications. We have developed a new framework called TinyMaCLaS(tiny middleware and compositional language for sensor networks) for sensor networks that simplifies the process of developing applications. As a part of this framework, we have developed a COMiS(component oriented middleware for sensor networks). Most of the protocols and middleware argue scalability through simulations. Unfortunately, theoretical analysis does not exist for scalability. We have done theoretical analysis, in order to prove the scalability of our middleware. The paper presents the theoretical analysis, and it can be used for any middleware or protocol.

关键词： Scalability Intelligent networks Wireless sensor networks Middleware Protocols object oriented modeling Intelligent sensors Intelligent transportation systems computer science Collaboration

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Automated detection of performance regressions: the mono experience

Automated detection of performance regressions: the mono exp...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication systems (MASCOTS)

作者： T. Kalibera L. Bulej P. Tuma Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Prague Czech Republic Institute of Computer Science Academy of Sciences of Czech Republic Czech Republic

engineering a large software project involves tracking the impact of development and maintenance changes on the software performance. An approach for tracking the impact is regression benchmarking, which involves automated benchmarking and evaluation of performance at regular intervals. Regression benchmarking must tackle the nondeterminism inherent to contemporary computer systems and execution environments and the impact of the nondeterminism on the results. On the example of a fully automated regression benchmarking environment for the mono open-source project, we show how the problems associated with nondeterminism can be tackled using statistical methods.

关键词： MONOS devices Benchmark testing Software performance Software testing Software quality Quality assurance Automatic testing Robustness Performance analysis Software engineering

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Music2Share - Copyright-compliant music sharing in P2P systems

Music2Share - Copyright-compliant music sharing in P2P syste...

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作者： Kalker, Ton Epema, Dick H. J. Hartel, Pieter H. Lagendijk, R.L. Van Steen, Maarten Philips Research Eindhoven Eindhoven 5656 AA Netherlands Technical University Eindhoven Eindhoven 5612 AZ Netherlands Parallel and Distributed Systems Group Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft 2600 GA Netherlands Distributed and Embedded Systems Group Department of Computer Science University of Twente Enschede 7500 AE Netherlands Delft University of Technology Delft 2628 CD Netherlands Department of Computer Science Vrije Universiteit Amsterdam 1081 HV Netherlands

Peer-to-peer (P2P) networks are generally considered to be free havens for pirated content, in particular with respect to music. We describe a solution for the problem of copyright infringement in P2P networks for music sharing. In particular, we propose a P2P protocol that integrates the functions of identification, tracking, and sharing of music with those of licensing, monitoring, and payment. This highly decentralized music-aware P2P protocol will allow access to large amounts of music of guaranteed quality;it merges in a natural way the policing functions for copyright protection·and an efficient music-management infrastructure for the benefit of the user. © 2004 IEEE.

关键词： Copyrights

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Generic Environment for Full Automation of Benchmarking 1

Generic Environment for Full Automation of Benchmarking

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Testing of Component-Based systems and Software Quality, 1st International Workshop on Software Quality, SOQUA 2004 and Workshop Testing Component-Based systems, TECOS 2004

作者： Kalibera, Tomáš Bulej, Lubomír Tůma, Petr Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Malostranské nám. 25 Prague118 00 Czech Republic Institute of Computer Science Czech Academy of Sciences Pod Vodárenskou věží 2 Prague182 07 Czech Republic

ISBN: (纸本)3885793873

Regression testing is an important part of software quality assurance. We work to extend regression testing to include regression benchmarking, which applies benchmarking to detect regressions in performance. Given the specific requirements of regression benchmarking, many contemporary benchmarks are not directly usable in regression benchmarking. To overcome this, we present a case for designing a generic benchmarking environment that will facilitate the use of contemporary benchmarks in regression benchmarking, analyze the requirements and propose architecture of such an environment. © 2004 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Benchmarking

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