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Mobile process description and execution

Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2006年 4025卷 32-47页

作者： Kunze, Christian P. Zaplata, Sonja Lamersdorf, Winfried Distributed Systems and Information Systems Computer Science Department University of Hamburg Vogt-Kölln-Str. 30 Hamburg22527 Germany

ISBN: (纸本)3540351264

Mobile devices are increasingly aware of their respective locations and vicinity and tend to communicate rather loosely with each other;therefore asynchronous communication paradigms are used predominately so far for corresponding mobile applications. However, while such communication mechanisms are suitable for simple activities, they may become insufficient for more complex tasks which consist of longer sequences of related activities tied together in application-oriented processes. This is of particular importance if the resulting operating sequence spans several mobile devices in frequently changing vicinities. Therefore, the work presented here provides a concept for integrating explicit support for such mobile processes into mobile system infrastructures and for distributing their execution over different nodes in the network. For this purpose, a corresponding middleware platform (extension) for context-aware mobile applications is proposed. It supports such migrating processes and helps to execute them under the restrictions typically imposed by realistic mobile applications. In particular, this paper proposes a corresponding process description language and an execution model for mobile and distributed (business) processes in the context of the project DEMAC (distributed Environment for Mobility-Aware Computing). © 2006, IFIP International Federation for Information Processing 2006.

关键词： Mobile computing

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Managing Risk of Inaccurate Runtime Estimates for Deadline Constrained Job Admission Control in Clusters

Managing Risk of Inaccurate Runtime Estimates for Deadline C...

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International Conference on Parallel Processing (ICPP)

作者： Chee Shin Yeo Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia

The advent of service-oriented grid computing has resulted in the need for grid resources such as clusters to enforce user-specific service needs and expectations. Service level agreements (SLAs) define conditions which a cluster needs to fulfill for various jobs. An example of SLA requirement is the deadline by which a job has to be completed. In addition, these clusters implement job admission control so that overall service performance does not deteriorate due to accepting exceeding amount of jobs. However, their effectiveness is highly dependent on accurate runtime estimates of jobs. This paper thus examines the adverse impact of inaccurate runtime estimates for deadline constrained job admission control in clusters using the earliest deadline first (EDF) strategy and a deadline-based proportional processor share strategy called Libra. Simulation results show that an enhancement called LibraRisk can manage the risk of inaccurate runtime estimates better than EDF and Libra by considering the risk of deadline delay

关键词： Risk management Admission control Grid computing Runtime library Delay estimation Resource management Quality of service Laboratories computer science Software engineering

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Policy-based Resource Allocation in Hierarchical Virtual Organizations for Global Grids

Policy-based Resource Allocation in Hierarchical Virtual Org...

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International Symposium on computer Architecture and High Performance Computing (SBAC-PAD)

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

In previous years, many studies have been conducted on grid computing, in which users and resource providers organize various virtual organizations (VOs) to share resources and services. A VO organizes other sub-VOs for the purpose of achieving the VO goal, which forms the hierarchical VO environment. In this paper, we model and formalize the resource allocation problem in hierarchical VOs. Resource providers and VOs agree upon the VO resource sharing policy, such as resource sharing amount and resource usage cost for VOs. We provide the resource allocation scheme of a VO resource broker to minimize the total cost in order to meet a user's job deadline. In addition, we deal with several cost adjustment methods in resource providers to utilize their resources efficiently in hierarchical VOs

关键词： Resource management Costs Grid computing Processor scheduling distributed computing Large-scale systems computer networks Authentication Aggregates Laboratories

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Gridscape II: A Customisable and Pluggable Grid Monitoring Portal and its Integration with Google Maps

Gridscape II: A Customisable and Pluggable Grid Monitoring P...

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International Conference on Grid and Cooperative Computing (GCC)

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

Grid computing has emerged as an effective means of facilitating the sharing of distributed heterogeneous resources, enabling collaboration in large scale environments. However, the nature of grid systems coupled with the overabundance and fragmentation of information, makes it difficult to monitor resources, services, and computations in order to plan and make decisions. In this paper we present Gridscape II, a customisable portal component that can be used on its own or plugged-in to compliment existing grid portals. Gridscape II manages the gathering of information from arbitrary, heterogeneous and distributed sources and presents them together seamlessly within a single interface. It also leverages the Google Maps API in order to provide a highly interactive user interface. Gridscape II is simple and easy to use, providing a solution to those users who do not wish to invest heavily in developing their own monitoring portal from scratch, and also for those users who want something easy to customise and extend for their specific needs

关键词： Portals Grid computing Information management Middleware Switches Resource management computerized monitoring computer science Software engineering Collaborative software

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City@home: Monte Carlo derivative pricing distributed on networked computers 1

City@home: Monte Carlo derivative pricing distributed on net...

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1st International Workshop on Grid Technology for Financial Modeling and Simulation, GRID 2006

作者： Germano, Guido Engel, Michael Scalas, Enrico Computer Simulation Group Department of Chemistry Philipps University Marburg Marburg35032 Germany Distributed Systems Group Department of Mathematics and Computer Science Philipps University Marburg Marburg35032 Germany Department of Advanced Sciences and Technologies Amedeo Avogadro University of East Piedmont Via Bellini 25 G Alessandria15100 Italy

Monte Carlo is a powerful and versatile derivative pricing tool, with the main drawback of requiring a large amount of computing time to generate enough realisations of the stochastic process. However, since realisations are independent from each other, the task is "embarassingly" parallel and the workload can be easily distributed on a large set of processors without the need for fast networking and thus an expensive dedicated supercomputer. Such an alternative, much cheaper and more accessible way can be realised with the BOINC toolkit, distributing the Monte Carlo runs on networked clients running under Windows, Linux or various Unix variants, and recollecting the results at the end for a statistical evaluation of the price distribution at the final time. Though it is likely that the clients will belong to the intranet of a large company or institution, we gave our program the evocative name City@home in honour of the paradigmatic SETI@home project. As an application, we present the generation of synthetic high frequency financial time series for speculative option valuation in the context of uncoupled continuous-time random walks (fractional diffusion), with a Lévy marginal density function for the tick-by-tick log returns and a Mittag-Leffler marginal density function for the waiting times. Lévy deviates are generated with the Chambers-Mallows-Stuck method, Mittag-Leffler deviates with the Kozubowski-Pakes method. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

关键词： Supercomputers

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KidneyGrid: A grid platform for integration of distributed kidney models and resources

KidneyGrid: A grid platform for integration of distributed k...

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4th International Workshop on Middleware for Grid Computing (MGC'06) held at the ACM/IFIP/USENIX International Middleware Conference

作者： Chu, Xingchen Lonie, Andrew Harris, Peter Thomas, S. Randall Buyya, Rajkumar Grid Computing and Distributed Systems Lab. Dept. of Computer Science and Software Eng. University of Melbourne Australia Department of Information Systems University of Melbourne Australia Unit Faculty of Medicine Dentistry and Health Sciences University of Melbourne Australia FRE 2873 CNRS/Université d'Evry - Val d'Essonnes 91000 Evry France

ISBN: (纸本)1595935819

In this paper, we present a grid computing platform that provides experimental scientists and analysts with access to computational simulations and knowledge databases hosted in separate laboratories around the world involved with human and animal kidney research. No single laboratory can develop these resources in isolation and the community of users should no longer need to be dependent upon the specific programming environment in which applications have been developed. This is a major innovation in life science and exploits the power of existing and planned high-bandwidth communications networks for collaborative research and for shared access to knowledge resources. The innovation is developed within a specialist community of renal scientists but will be transferable to any other field of research requiring interaction between published literature and databases, theoretical models and simulations and the formulation of effective experimental design. © 2006 ACM.

关键词： Grid computing

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A budget constrained scheduling of workflow applications on utility Grids using genetic algorithms

A budget constrained scheduling of workflow applications on ...

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Workshop on Workflows in Support of Large-Scale science, WORKS

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

Over the last few years, grid technologies have progressed towards a service-oriented paradigm that enables a new way of service provisioning based on utility computing models. Users consume these services based on their QoS (quality of service) requirements. In such “pay-per-use” grids, workflow execution cost must be considered during scheduling based on users' QoS constraints. In this paper, we propose a budget constraint based scheduling, which minimizes execution time while meeting a specified budget for delivering results. A new type of genetic algorithm is developed to solve the scheduling optimization problem and we test the scheduling algorithm in a simulated grid testbed.

关键词： Genetic algorithms Silicon Photovoltaic effects Optical interconnections Microactuators Electrostatics Electrodes Mirrors Photovoltaic systems Solar power generation

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Medium Access Control with Adjustable Sleeps for Wireless Sensor Networks

Medium Access Control with Adjustable Sleeps for Wireless Se...

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IEEE Symposium on computers and Communications (ISCC)

作者： C.K. Nguyen A. Kumar Mobile Information Networks & Distributed Systems MINDS Lab Computer Engineering & Computer Science CECS Department University of Louisville Louisville KY USA

The paper proposes a throughput and energy-aware medium-access-control protocol for wireless sensor networks. The proposed approach provides a sleeping-time adjustment scheme to flexibly adjust the sleep time to reduce the wasted energy in a low-traffic network and increase the throughput in a high-traffic network. The sleeping and waking durations are determined using time counters rather than time slots. A waking-time sharing scheme is responsible for establishing the common waking time among a group of neighbors for group communication. The proposed protocol solves the energy inefficiency caused by idle listening. Simulation experiments have been performed to demonstrate the effectiveness of the proposed approach compared to some other energy-aware medium-access-control protocols.

关键词： Media Access Protocol Sleep Wireless sensor networks Throughput Access protocols Energy consumption Scheduling Wireless application protocol Frequency Time division multiple access

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Design and Performance Evaluation of Fail-over and Recovery Strategies for Large-Scale Multimedia Storage systems

Design and Performance Evaluation of Fail-over and Recovery ...

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IEEE International Conference on Networks

作者： Zeng Zeng Bharadwaj Veeravalli Jaideep Srivastava Computer Networks and Distributed Systems Laboratory National University of Singapore Singapore Department of Computer Science and Engineering University of Minnesota Minneapolis MN USA

ISBN: (纸本)0780397460

Failure-over and recovery is a crucial issue for large-scale multimedia storage system (MSS). In the literature, there are two fail-over policies: active-standby fail-over and active-active fail-over. In this paper, we adopt an active-active policy and design two heuristic algorithms to determine the number and the placement of the object replicas among the multimedia servers. One is named as "minimum average waiting time" (MAWT) strategy, in which we will choose the server to store an object replica according to an optimal solution, and the other algorithm is named as "one of the best two choices" (OBTC) strategy, in which we will randomly choose one out of the first two best choices according to an optimal solution. We analyze their performance in the cases when the system runs normally and when some failure occurs. Via rigorous simulations, we find that when the system is running normally (without failures), MAWT performs better than OBTC and when some server fails, OBTC performs much better than MAWT

关键词： Large-scale systems Multimedia systems Network servers Information retrieval File servers computer science Design engineering computer networks Laboratories Algorithm design and analysis

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Throughput Performance of Java Messaging Services Using FioranoMQ

Throughput Performance of Java Messaging Services Using Fior...

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13th GI/ITG Conference - Measuring, Modelling and Evaluation of computer and Communication systems

作者： Robert Henjes Michael Menth Sebastian Gehrsitz Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland D-97074 Würzburg Germany

The Java messaging service (JMS) is a means to organize communication among distributed applications according to the publish/subscribe principle. If the subscribers install filter rules on the JMS server, JMS can be used as a message routing platform, but it is not clear whether its message throughput is sufficiently high to support large-scale systems. In this paper, we investigate the capacity of the high performance JMS server implementation by Fiorano. In contrast to other studies, we focus on the message throughput in the presence of filters and show that filtering reduces the performance significantly. We also present a model that describes the service time for a single message depending on the number of installed filters and validate it by measurements. This model helps to forecast the system throughput for specific application scenarios.

关键词： Random access memory Throughput

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