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Abstract: "We present a soft real-time CPU server for Continuous Media processing in the UNIX environment. The server is a daemon process from which applications can request and acquire soft real-time QoS (Quality of Service) Guarantees. Our server is an extension of the URsched scheduler. It provides (1) protection among real-time (RT) processes (2) fairness among RT and non-RT processes, (3) rate monotonic scheduling, (4) a fix to the UNIX security problem. We have implemented our protocol in the SUN Solaris 2.5 Operating System, and we have shown through experiments that our soft RT server provides predictable QoS for continuous media applications. We also discuss how we will fit the real-time server into our general Resource Broker Architecture in our future work."
Content Description #Includes bibliographical references and index.
Real-time scheduling algorithms are usually only available in the kernels of real-time operating systems, and not in more general purpose operating systems, like Unix. For some soft real-time problems, a traditional operating system may be the development platform of choice. This paper addresses methods of emulating real-time scheduling algorithms on top of standard time-share schedulers. We examine (through simulations) three strategies for priority assignment within a traditional multi-tasking environment. The results show that the emulation algorithms are comparable in performance to the real-time algorithms and in some instances outperform them.
Grid and cooperative computing has emerged as a new frontier of information tech- logy. It aims to share and coordinate distributed and heterogeneous network resources forbetterperformanceandfunctionalitythatcanotherwisenotbeachieved.Thisvolume contains the papers presented at the 2nd International Workshop on Grid and Coope- tive Computing, GCC 2003, which was held in Shanghai, P.R. China, during December 7–10, 2003. GCC is designed to serve as a forum to present current and future work as well as to exchange research ideas among researchers, developers, practitioners, and usersinGridcomputing,Webservicesandcooperativecomputing,includingtheoryand applications. For this workshop, we received over 550 paper submissions from 22 countries and regions. All the papers were peer-reviewed in depth and qualitatively graded on their relevance, originality, signi?cance, presentation, and the overall appropriateness of their acceptance. Any concerns raised were discussed by the program committee. The or- nizing committee selected 176 papers for conference presentation (full papers) and 173 submissions for poster presentation (short papers).The papers included herein represent the forefront of research from China, USA, UK, Canada, Switzerland, Japan, Aust- lia, India, Korea, Singapore, Brazil, Norway, Greece, Iran, Turkey, Oman, Pakistan and other countries. More than 600 attendees participated in the technical section and the exhibition of the workshop.
This book is a spin-off of a by-invitation-only workshop on self-* properties in complex systems held in summer 2004 in Bertinoro, Italy. The workshop aimed to identify the conceptual and practical foundations for modeling, analyzing, and achieving self-* properties in distributed and networked systems. Based on the discussions at the workshop, papers were solicited from workshop participants and invited from leading researchers in the field. Besides presenting sound research results, the papers also present visionary statements, thought-provoking ideas, and exploratory results. The 27 carefully reviewed revised full papers, presented together with a motivating introduction and overview, are organized in topical sections on self-organization, self-awareness, self-awareness versus self-organization, supporting self-properties, and peer-to-peer algorithms.
Policy based systems are the subject of a wide range of activities in univer- ties, standardisation bodies, and within industry. They have a wide spectrum of applications ranging from quality of service management within networks to - curity and enterprise modelling. This Lecture Notes volume collects the papers presented at the workshop on Policies for Distributed Systems and Networks held at the Hewlett-Packard Laboratories in Bristol, UK in January 2001. After a rigorous review process 16 papers were selected from 43 submissions. Within the Internet community there is considerable interest in policy based networking. A number of companies have announced tools to support the sp- i?cation and deployment of policies. Much of this work is focused on policies for quality of service management within networks and the Internet Engineering and Distributed Management Task Force (IETF/DMTF) is actively working on standards related to this area. The security community has focused on the speci?cation and analysis of - cess control policy which has evolved into the work on Role-Based Access Control (RBAC). There has been work over a number of years in the academic c- munity on speci?cation and analysis of policies for distributed systems mostly concentrating on authorisation policies. Although there are strong similarities in the concepts and techniques used by the di?erent communities there is no commonly accepted terminology or notation for specifying policies.