Global Grids and Software Toolkits: A Study of Four Grid Middleware Technologies

Grid is an infrastructure that involves the integrated and collaborative use of computers, networks, databases and scientific instruments owned and managed by multiple organizations. Grid applications often involve large amounts of data and/or computing resources that require secure resource sharing across organizational boundaries. This makes Grid application management and deployment a complex undertaking. Grid middlewares provide users with seamless computing ability and uniform access to resources in the heterogeneous Grid environment. Several software toolkits and systems have been developed, most of which are results of academic research projects, all over the world. This chapter will focus on four of these middlewares--UNICORE, Globus, Legion and Gridbus. It also presents our implementation of a resource broker for UNICORE as this functionality was not supported in it. A comparison of these systems on the basis of the architecture, implementation model and several other features is included.Comment: 19 pages, 10 figure

A QoS-Control Architecture for Object Middleware

This paper presents an architecture for QoS-aware middleware platforms. We present a general framework for control, and specialise this framework for QoS provisioning in the middleware context. We identify different alternatives for control, and we elaborate the technical issues related to controlling the internal characteristics of object middleware. We illustrate our QoS control approach by means of a scenario based on CORBA

Analysis of Windows Cardspace Identity Management System

The Internet, which was originally developed for academic purposes, has expanded and been applied to commercial and business enterprises. It is possible to purchase airline tickets, check bank balances and communicate through e-mail with each other through the Internet. These services can all be performed relatively easily with the proliferation of Internet Service Providers and the lower cost of Personal Computers. The development of the Internet has also had a huge impact on businesses with the growth of e-commerce, e-banking and the tremendous growth in email traffic. There is however a negative impact to this development of the Internet with the rise in on-line criminal activity. The increasing use of the Internet has resulted in the development of on-line identities for users. There can be a great deal of sensitive and personal information associated with an on-line identity and gaining access to these privileges can provide cyber criminals with access to personal resources such as bank account details, credit card information etc. This type of activity has given rise to the term identity theft . This project will present an introduction to Microsoft Cardspace and how it relates to dealing with identity theft, the theory behind the application and present practical demonstrations of how the technology can be implemented using Microsoft© .NET framework technology

Summary

20090506_fidis_D3.12 final 1.0.od

Economic-based Distributed Resource Management and Scheduling for Grid Computing

Computational Grids, emerging as an infrastructure for next generation computing, enable the sharing, selection, and aggregation of geographically distributed resources for solving large-scale problems in science, engineering, and commerce. As the resources in the Grid are heterogeneous and geographically distributed with varying availability and a variety of usage and cost policies for diverse users at different times and, priorities as well as goals that vary with time. The management of resources and application scheduling in such a large and distributed environment is a complex task. This thesis proposes a distributed computational economy as an effective metaphor for the management of resources and application scheduling. It proposes an architectural framework that supports resource trading and quality of services based scheduling. It enables the regulation of supply and demand for resources and provides an incentive for resource owners for participating in the Grid and motives the users to trade-off between the deadline, budget, and the required level of quality of service. The thesis demonstrates the capability of economic-based systems for peer-to-peer distributed computing by developing users' quality-of-service requirements driven scheduling strategies and algorithms. It demonstrates their effectiveness by performing scheduling experiments on the World-Wide Grid for solving parameter sweep applications

Integrating Mobile Devices Into Grid Applications

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2007Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2007Mobil cihazların Grid teknolojilerine ve sunucu uygulamalarına entegrasyonu bir taraftan süper bilgisayarları bir mobil cihazla kumanda etmeye olanak sağlanarken diğer taraftan da büyük uygulamaların önemli verilere heryerde ve her zaman erişebilmesine olanak sağlayabilir. Bu çalışma, GPS, sıcaklık, sağlık izleme ve kirlilik gibi farklı çeşitteki algılayıcıları barındırabilecek aynı zamanda pekçok yerden veri toplamaya olanak sağlayacak mobil cihazlardan veri toplama, işleme ve paylaşma üzerine bir örnek olması üzere planlandı. Projede konum ve hız verisi üretebilecek GPS alıcısına sahip mobil cihazlara örnek olarak cep telefonları kullanıldı. Sürücünün cep telefonu gibi otomobil içerisinde yerleştirilen mobil cihazların üzerinde koşturmak üzere geliştirilen istemci, konum ve hız verisini kısa zaman aralıklarında XML mesajları fotmatında GPRS üzerinden sunucuya göndermektedir. GDF formatında ana yol koordinatları önceden girilmiş sunucu uygulaması, aracın üzerinde hareket ettiği yolu bulur, yol için hız verisini zaman damgası ile birlikte kaydeder. Hızların ortalamasını hesaplamak ve bunu Internet ve WAP üzerinden sunmak üzere bir de görüntüleme uygulaması geliştirilmiştir. Eğer güncel veri yoksa, yani eğer o anda o yol üzerinde veri aktaran bir araç yoksa, istatistiksel veri kullanılarak bilgi sunulur. Böylece trafiği sadece uzamsal değil ayrıca zamansal olarak önceden görmek mümkün olur. Mobil cihaz üzerinde koşturan istemci uygulaması veya herhangi bir bilgisayar entegre sistem tarafından üretilen bilgiyi kullanabilir. Her ne kadar projede geliştirilen uygulamanın asıl amacı trafik bilgisi üretmek ve paylaşmak olsa da araç takibi, hatta trafik yönetimi için sistematik yaklaşımlar bu proje tarafından mümkün kılınabilir.Integrating mobile devices into Grid technologies and server applications can give ability to command power of supercomputers with a mobile device on one hand and can allow big applications to reach important data anywhere, anytime, on the other. This project is planned to be an example to gather and share data that can be collected by ubiquitous mobile devices which can employ different kind of sensors such as GPS, temperature, health monitoring and pollution. In this project location and speed information that is produced by GPS enabled mobile devices such as mobile phones, is used. The developed client application running on mobile devices located in vehicles, such as the mobile phone of the driver, sends location and speed information to the server application in short time intervals via GPRS in the forms of XML like messages. The developed server application, which is preloaded with the highway coordinates via files in GDF format, locates the street that the vehicle is moving along and the received speed information is recorded along with a timestamp. A display application has also been implemented to calculate average of speeds at that very moment and post it on the Internet and WAP. If there is no actual data, i.e. there is no vehicle moving on a specific street, statistical data is utilized to produce such information. Thus foreseeing the traffic not only spatially but also in time is made possible.Yüksek LisansM.Sc

Enhancing reliability with Latin Square redundancy on desktop grids.

Computational grids are some of the largest computer systems in existence today. Unfortunately they are also, in many cases, the least reliable. This research examines the use of redundancy with permutation as a method of improving reliability in computational grid applications. Three primary avenues are explored - development of a new redundancy model, the Replication and Permutation Paradigm (RPP) for computational grids, development of grid simulation software for testing RPP against other redundancy methods and, finally, running a program on a live grid using RPP. An important part of RPP involves distributing data and tasks across the grid in Latin Square fashion. Two theorems and subsequent proofs regarding Latin Squares are developed. The theorems describe the changing position of symbols between the rows of a standard Latin Square. When a symbol is missing because a column is removed the theorems provide a basis for determining the next row and column where the missing symbol can be found. Interesting in their own right, the theorems have implications for redundancy. In terms of the redundancy model, the theorems allow one to state the maximum makespan in the face of missing computational hosts when using Latin Square redundancy. The simulator software was developed and used to compare different data and task distribution schemes on a simulated grid. The software clearly showed the advantage of running RPP, which resulted in faster completion times in the face of computational host failures. The Latin Square method also fails gracefully in that jobs complete with massive node failure while increasing makespan. Finally an Inductive Logic Program (ILP) for pharmacophore search was executed, using a Latin Square redundancy methodology, on a Condor grid in the Dahlem Lab at the University of Louisville Speed School of Engineering. All jobs completed, even in the face of large numbers of randomly generated computational host failures