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Topic: Distributed operating system

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	NationMaster - Encyclopedia: Amoeba distributed operating system
		The Amoeba distributed operating system is a microkernel-based research operating system written by Andrew S. Tanenbaum at Vrije Universiteit.
		The aim of the project was to build a timesharing system that appeared to the user as a single machine even though it was running on multiple machines.
		Operating Systems: Design and Implementation and Minix [1] were Linus Torvalds' inspiration for the Linux kernel.
	www.nationmaster.com /encyclopedia/Amoeba-distributed-operating-system (198 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-24)
		A distributed file system (DFS) is a network file system whose clients, servers, and storage devices are dispersed among the machines of a distributed system or intranet.
		A DFS can be implemented as part of a distributed operating system, or else by a software layer whose task is to manage the communication between conventional operating systems and file systems.
		A distributed file system for distributed conferencing system ("A DFS for the DCS") by Philip S Yeager, Thesis, University of Florida, 2003.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Distributed_file_system (690 words)

	Amoeba - A Distributed Operating System for the 1990s - Mullender, Van Rossum, Tanenbaum, Van Renesse, Van Staveren ... (Site not responding. Last check: 2007-10-24)
		Abstract: Amoeba is the distributed system developed at the Free University (VU) and Centre for Mathematics and Computer Science (CWI), both in Amsterdam.
		Throughout the project's ten-year history, a major concern of the designers has been to combine the research themes of distributed systems, such as high availability, use of parallelism and scalability, with simplicity and high performance.
		Distributed systems are necessarily more complicated than centralized systems, so they have a tendency to be much...
	citeseer.ist.psu.edu /mullender90amoeba.html (498 words)

	Prof. Mukesh N. Tekwani's Notes Online - Operating Systems (Site not responding. Last check: 2007-10-24)
		In a true distributed system, users are not aware of where their programs are being run or where their files are residing; they should all be handled automatically and efficiently by the operating system.
		System architecture is crucial to the type of system growth, however, since it is hard to give each user of a personal computer another 10 per cent.
		Multiprogramming operating system is operating system which, in addition to supporting multiple concurrent process (several processes in execution states simultaneously) allows the instruction and data from two or more separate processes to reside in primary memory simultaneously.
	education.vsnl.com /tekwani/osnotes.htm (3307 words)

	distributed operating system - infos
		The exokernel, a novel operating system architecture, was the framework...
		Distributed Environment) is an object-oriented distributed operating system for the development and...
		The E1 operating system is aimed to provide efficient support for reliable distributed computing, based on object replication, component model support and persistence.
	www.angelfire.com /alt2/ang3/13/distributed-operating-system.html (206 words)

	Amoeba distributed operating system - Wikipedia, the free encyclopedia
		The Amoeba distributed operating system is a microkernel-based research operating system written by Andrew S. Tanenbaum at Vrije Universiteit.
		The aim of the project was to build a timesharing system that appeared to the user as a single machine even though it was running on multiple machines.
		Development seems to have stalled: the files in the latest version (5.3) were last modified on the 12th of February 2001.
	en.wikipedia.org /wiki/Amoeba_distributed_operating_system (113 words)

	Article Targeted at: System Developers & Analysts (Site not responding. Last check: 2007-10-24)
		The distributed operating system could be defined as an OS that manages a set of independent computers rather than managing single computer.
		Some of the distributed operating systems that were developed are Amoeba, Inferno, Plan 9 and Sprite.
		Sprite was not a complete distributed operating system since not all features of distributed OS was implemented.
	renoir.vill.edu /~sgudipat/rev_dis.htm (486 words)

	Distributed Operating Systems (Site not responding. Last check: 2007-10-24)
		Centralised systems refer to those having a single very powerful computer supporting the network of peripheral devices and terminals.For example a processing plant may be controlled by a single main computer interfaced to many sensors and actuators located at each stage in the process.
		Distributed operating systems are based either on a monolithic or micro kernel structure.The microkernel alternative offers greater flexibility than the monolithic structure.
		Many systems in which distributed processing is used are huge and extendible during their lifetime.The systems must be designed to cope with this dynamic nature.
	www.iis.ee.ic.ac.uk /~frank/surp98/article1/sb19 (1380 words)

	Haupttext
		In distributed operating system a name server is used to map the names given by the user onto objects, ie: in directory system.
		The most common operation is for user to present the directory server with a capability for a directory and an ASCII string and ask for the capability that corresponds to that string in the given directory, Other operation are entering and deleting that pairs.
		Operation on local objects, the common case are performed fast because the process are handled by the local server.
	nakula.rvs.uni-bielefeld.de /~made/old_stuff/amoeba (8183 words)

	MIT CSAIL Parallel and Distributed Operating Systems
		We have conducted research in operating systems, networking, mobile computing, language design, compiler design, and architecture, taking a pragmatic approach: we build high-performance, reliable, and working systems.
		The exokernel, a novel operating system architecture, was the framework of much of our prior research.
		An exokernel eliminates the high-level abstractions most of today's operating systems are built on, instead concentrating on securely and efficiently multiplexing the raw hardware.
	pdos.csail.mit.edu (246 words)

	Operating System Projects
		Harmony is a multitasking, multiprocessing operating system for realtime control, developed at the National Research Council to serve a need for a flexible system for realtime control of robotics experiments and for other applications of embedded systems where predictable temporal performance is a requirement.
		The Hurricane operating system is a hierarchically clustered operating system implemented on the Hector multiprocessor.
		Distributed systems principles are applied by distributing and replicating system services and data objects to increase locality, increase concurrency, and to avoid centralized bottlenecks, thus making the system scalable.
	www-hiraki.is.s.u-tokyo.ac.jp /members/nobukuni/full.html (4455 words)

	15.3 Time Warp (Site not responding. Last check: 2007-10-24)
		TWOS is not intended as a general-purpose multiuser operating system, but rather as an environment for a single concurrent application (especially a simulation) in which synchronization is specified using virtual time [Jefferson:85c].
		The innovation that distinguishes TWOS from other operating systems is its complete commitment to an optimistic style of execution and to processing rollback for almost all synchronization.
		Most distributed operating systems either cannot handle process rollback at all or implement it as a rarely used mechanism for special purposes such as exception handling, deadlock , transaction abortion, or fault recovery.
	www.netlib.org /utk/lsi/pcwLSI/text/node364.html (918 words)

	[No title]
		The Cronus kernel is the only program in the Cronus system which directly uses broadcast capability (other parts of Cronus communicate using mechanisms provided by the kernel).
		The repeater imposes a fair amount of overhead on the shared hosts that currently support it due to the necessity of waking the forwarder process on all UDP packets which arrive at the host, since the decision to reject a packet is made by user-level software, rather than in the network protocol drivers.
		One solution to this problem would be to implement the packet filtering in the system kernel (leaving the configuration management and rebroadcast mechanism in user code) as has been done by Stanford/CMU in a UNIX packet filter they have developed.
	www.ietf.org /rfc/rfc947.txt (1625 words)

	Millennium
		Such an operating system would raise the level of abstraction for developers and users, so that individual computers, file systems, and networks become unimportant to most computations in the same way that processor registers, disk sectors, and physical pages are today.
		Users should be able to use any computing device that is part of the distributed system as naturally and productively as they would use the machine on their desk or in their den at home.
		The system should be able to reason about its computations and resources, allocating, replicating, and moving computations and data to optimize its own performance, resource usage, and fault-tolerance.
	research.microsoft.com /research/sn/Millennium/mgoals.html (2875 words)

	Background
		However, it is an ongoing research project and new versions of the operating system are being released quite frequently.
		Before talking about the design principles of the operating system it is perhaps a good idea to look at the kind of system architecture for which Amoeba has been designed.
		In its request the client needs to specify the object (described in the next section) on which the operation is to be performed, the kind of operation that needs to be performed and also the associated parameters.
	www.cs.rice.edu /~qasem/papers/amoeba_paper.html (1870 words)

	distributed network operating system - infos
		Distributed operating system for robot network (title only) Distributed operating system for robot network (title only) S. Fujita...
		The HetNOS Network Operating System: a tool for writing distributed applications The HetNOS Network Operating System: a tool for writing distributed applications The HetNOS network operating system is a set of software layers laid over "native...
		This section lists distributed and network operating systems, those designed to provide common control for a set of computers communicating through a network.
	angelfire.com /alt2/ang3/13/distributed-network-operating-system.html (259 words)

	SecurityDocs: Operating System
		Operating Systems can be viewed as a resource manager, responsible for fair resource sharing between different processes in the system.
		On the other hand, Operating systems control access to application memory and scheduling of the processor.
		In addition the operating system provides tools for security policy and account management and the Windows NT security model is flexible and can support a wide range of configurations.
	www.securitydocs.com /Operating_System (687 words)

	AgentOS
		Distributed, network-centric data and application hosting: Distribution transparency over a wide-area, mobile network calls for network-centric data and application hosting; that is, distributed hosts on the fixed network collaborate to provide data and application hosting for individual users.
		Although existing frameworks and distributed systems for mobile computing, such as that of Bayou [1] and Rover [2], tackle distributed consistency and replication management, their communication models and programming models are unsatisfactory.
		System functions, such as resource management, are carried out by agents, hence an operating system of agents.
	www.acm.org /crossroads/xrds5-2/agentos.html (1881 words)

	VSBS: Research
		Research theme of the "Distributed Systems and Operating Systems" Group at the University of Ilmenau are communication infrastructures for distributed multimedia applications with mobile components.
		We apply our work to distributed multimedia applications on CORBA and Java middleware platforms, running on a network of multimedia data base servers, stationary Linux work stations, mobile Laptops and PDAs, connected by a stationary and wireless local area networks.
		An early microkernel realtime operating system (1982) at the University of Dortmund.
	www.tu-ilmenau.de /fakia/449+M54099f70862.0.html (500 words)

	E1 Distributed Operating System
		To provide applications with transparent access to all resources of computer network, state and functionality of operating system components and application software are encapsulated by distributed objects.
		In E1 a complete or partial copy of a distributed object's state is placed in each node where the object is used.
		Persistence is the ability of the objects to exist for unlimited time, irrespectively of whether a system functions continuously.
	www.e1os.org (377 words)

	Distributed Operating System Amoeba - general
		At heart of the Amoeba system are several specialized servers that carry out and synchronize the fundamental operations of the kernel.
		Amoeba is organized as a collection of objects (essentially abstarct data types), each with some number of operations that processes can perform on it. Operations on an object are performed by sending a message to the object's server.Objects are created by processes and managed by the corresponding server.
		Operations on objects are performed with Stub-procedures.When an object is created, the server returns a Capability. The capability is used to address and protect the object.
	fsd-amoeba.sourceforge.net /amoeba.html (1622 words)

	The Distributed Trusted Operating System (DTOS) Home Page (Site not responding. Last check: 2007-10-24)
		The Distributed Trusted Operating System (DTOS) project was a joint effort by the National Security Agency (NSA) and Secure Computing Corporation (SCC) to encourage strong, flexible security controls in next generation operating systems.
		Several different operating systems with flexible security mechanisms were studied to determine their ability to support a range of security policies.
		The second main part of the program was to perform research into assurance techniques for microkernel-based operating systems, with an emphasis on the practical use of formal mathematical methods.
	www.cs.utah.edu /flux/dtos (412 words)

	Authena Open Source CMS & DRM :: Marrying Open Source Digital Rights Management (DRM) to Open Source Content Management ...
		Authena is devoted to fostering the development of an open DRM system which will allow creators to be compensated for their works or place them in the public domain.
		While open source is best suited to massive projects supporting objective functionality such as operating systems and complex applications, intellectual property which relies on the individual's vision, such as photographs, paintings, novels, songs, and poems, is often better encouraged by a DRM system which allows the creator to define the rights and be compensated.
		A new model, consisting of a distributed network of thousands of creators hosting their content on Open Source CMS and syndicating it to trusted archives and marketplaces, is emerging.
	www.authena.org (4387 words)

	2K: An Operating System for the Next Millennium
		is an open source, distributed adaptable operating system being built by the Systems Software Research Group and by the Multimedia Operating Systems and Networking Group in the University of Illinois at Urbana-Champaign.
		We are currently working together with the Systems and Communications Group from the Universidad Carlos III, Madrid, and researchers at the University of São Paulo and University of Campinas.
		Distributed Systems Group, University of São Paulo, Brazil.
	srg.cs.uiuc.edu /2k (814 words)

	MagnetOS (Site not responding. Last check: 2007-10-24)
		Yet most of these efforts treat ad hoc networks as a "system of systems." That is, applications treat each node as an independent, autonomous entity and cannot rely on a systems layer to provide services and perform resource allocation beyond the most rudimentary packet forwarding services.
		MagnetOS is a distributed operating system for ad-hoc and sensor networks whose goal is to enable power-aware, adaptive, and easy-to-develop ad-hoc networking applications.
		Our approach is to provide these properties through a single system image of a unified virtual machine to applications over an ad-hoc collection of heterogeneous nodes.
	www.cs.cornell.edu /People/egs/magnetos (360 words)

	What is a distributed operating system?
		Distributed O/S is the version that is prepackage from one of the major sellers like Dell or Gateway.
		Contribute a new answer to "What is a distributed operating system?"
		This is not for following-up or discussing "What is a distributed operating system?" FAQ Farm only allows simple questions and answers.
	www.faqfarm.com /Q/What_is_a_distributed_operating_system (443 words)

	Webgids resultaten voor: Computers : Software : Operating Systems : Network : Distributed
		Distributed operating system, to be fully object-oriented, preemptively multithreaded/tasked, event/message-driven.
		Mobile agent system for ubiquitous computing; new way to cope with the wide-area, large-scale ubiquitous computing environment of near future.
		An operating system that lets applications be built simpler.
	www.vinden.nl /g/?cat=/Computers/Software/Operating_Systems/Network/Distributed/&tag=7236883628I1163811855&pg=2 (330 words)

	Distributed Operating Systems Resources (Site not responding. Last check: 2007-10-24)
		Distributed Operating Systems page, the High Performance Networks and Distributed Systems Archive, and CSGS's Parallel and Distributed Computing Resources.
		Centres for research in distributed operating systems include the Amoeba project at Vrije Universiteit, the
		Related course notes include CS5204: Operating Systems at Virginia Tech.
	www.scs.carleton.ca /~csgs/resources/dos.html (143 words)

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