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SUMO Home PageWelcome to Lancaster University's SUMO Home Page: Support for Multimedia inOperating SystemsIntroductionOver the past few years members of the SUMO team at Lancaster Universityand CNET, France Telecom have been designing andimplementing a microkernel based system with facilities to supportdistributed real-time and multimedia applications and ODP based multimediadistributed application platforms.We are interested in both communications and processing support fordistributed real-time/ multimedia applications in end systems, and believethat such applications require thread-to-thread real-time supportaccording to user supplied quality of service (QoS) parameters. Suchsupport, depending on the level of QoS commitment required, may requirededicated, per-connection, resource allocation in the CPU scheduler,virtual memory system and communication system. It may also require ongoingdynamic QoS management in all these areas. Another important requirement wehave imposed on ourselves is to support standard UNIX applications on thesame machine as our real-time/ multimedia support infrastructure; we do notwant to build a specialist real-time system that is isolated from thestandard application environment. Efficiency is a primeconsideration in our work. In particular, we are interested in minimisingsystem imposed overheads by reducing the cost and number of system calls,context switches and copy operations.To achieve these ends we use the Chorus microkernel as a vehicle for our research (Chorus tech. reports are available here). Chorus lets usrun UNIX applications through a SVR4 compatible UNIX 'personality' known asChorus/MiX, and also provides rudimentary real-time support to nativeChorus applications. We have designed our distributed real-time/ multimediasupport system as a Chorus 'personality' implemented partly in kernel spaceand partly as a user level library to be linked with native Chorusapplications. The personality provides a QoS driven applicationprogrammer's interface (API), connection oriented communications withdedicated, per-connection, resources, and facilities for monitoring andmaintaining ongoing QoS levels.Our approach is structured around a set of key architectural principles:upcall-driven application structuring whereby communicationsevents are system rather than application initiated,split-level system structuring whereby key system functions arecarried out co-operatively between kernel and user level components, anddecoupling of control transfer and data transfer whereby thetransfer of control is carried out asynchronously with respect to thetransfer of data.Recently, we have begun investigating the use of the SUMO system as a support infrastructure for CORBA. We are augmenting theexisting CORBA computational model with stream interfaces for multimedia,and QoS annotations on interfaces (along the lines suggested by the ISO'sRM-ODP Reference Model for Open Distributed Processing). We are then underpinning the enhanced modelwith the SUMO real-time functionality. The intention is to exploit the resulting"real-time CORBA" both in end-systems and on internal nodes in broadband networks.A primary role of real-time CORBA in the network is to serve as a supportinfrastructure for the implementation of open signalling protocols. This work is part of the OPENSIG research activity managed by Columbia University,New York. The open signalling work is also coordinated with the BT Labs funded Management of Multiservice Networks project of which Lancaster is a member.The project is also closely related to the QoS-A Project at Lancaster.You can find details of this, along with other projectsrun by the Distributed Multimedia Research Group, here. PersonnelThe SUMO team at Lancaster comprises the following researchers:Dr. Geoff CoulsonDr. Gordon BlairPhilippe RobinIn addition, Michael Papathomas, now at IMAG Grenoble, hasworked on SUMO in the past and is still closely associated with theproject.Papers and ReportsA more detailed description of our work can be found in the literature. Inparticular, the architectural principles are expanded on in:Architectural Principlesand Techniques for Distributed Multimedia Application Support in OperatingSystemsCoulson, G., and G.S. BlairACM Operating Systems Review, Vol 29, No 4,pp 17-24, October 1995.(MPG-95-09)The microkernel API is comprehensively described in:Micro-kernel Supportfor Continuous Media in Distributed SystemsCoulson, G., G.S. Blair, and P. RobinComputer Networks and ISDN Systems 26, pp 1323-1341, 1994.(MPG-93-04)Supporting ContinuousMedia Applications in a Micro-Kernel EnvironmentCoulson, G., G.S. Blair, P. Robin, and D. ShepherdArchitecture and Protocols for High-Speed Networks. Editor: OttoSpaniol, Kluwer Academic Publishers, 1994. (MPG-94-16)The underlying microkernel based infrastructure is covered in:Extendingthe Chorus Micro-kernel to Support Continuous Media ApplicationsCoulson, G., G.S. Blair, and P. RobinProc. 4th International Workshop on Network and Operating SystemSupport for Digital Audio and Video (NOSSDAV), Lancaster, UK, SpringerVerlag, pp 49-60, 1993. (MPG-93-20)TheDesign of a QoS Controlled ATM Based Communications System in ChorusCoulson, G., A. Campbell, P. Robin, G. Blair, M. Papathomas, and D.HutchisonIEEE Journal on Selected Areas in Communications, Special Issue onATM LANs, Vol 13, No 4, pp 686-699, May 1995. (MPG-94-05)Further project references are as follows:Supporting Real-timeMultimedia Behaviour in Open Distributed Systems: An Approach Based onSynchronous LanguagesBlair, G.S., M. Papathomas, G. Coulson, P. Robin, J.B. Stefani, F.Horn, and L. HazardProc. ACM Multimedia '94, San Francisco, USA, 1994. (MPG-94-13)Meetingthe Real-time Synchronisation Requirements of Multimedia in OpenDistributed SystemsCoulson, G., and G.S. BlairDistributed Systems Engineering Journal (DSEJ), Vol 1, No 1, pp 135-144,1994. (MPG-92-45)A Model for Active Object Coordination and its use for DistributedMultimedia ApplicationsPapathomas, M., G.S. Blair, and G. CoulsonObject-Based Models and Languages for Concurrent Systems, Springer Verlag Lecture Notes in Computer Science, 1994.(MPG-94-23)AProgramming Model and System Infrastructure for Real-Time Synchronisationin Distributed Multimedia SystemsBlair, G.S., G. Coulson, M. Papathomas, J.B. Stefani, F. Horn and L. HazardIEEE Journal on Selected Areas in Communications Special Issue onMultimedia Synchronisation, 1995. (MPG-94-21)Supporting theReal-time Requirements of Continuous Media in Open DistributedProcessingCoulson, G., G.S. Blair, J.B. Stefani, F. Horn, and L. HazardComputer Networks and ISDN Systems, Vol 27, No 8, July1995.(MPG-92-35)Scheduling andAdmission Testing for Jitter Constrained Periodic ThreadsMauthe, A., G. Coulson, G.S. Blair, and D. HutchisonProc. Fifth International Workshop on Network and Operating SystemSupport for Digital Audio and Video, Boston, USA, 1995. (MPG-95-04)Addressingthe Real-Time Synchronisation Requirements of Multimedia in anObject-Oriented FrameworkPapathomas, M., G.S. Blair, G. Coulson, and P. RobinProc. IST&T/SPIE High Speed Networks and Multimedia Computing '95,San Jose, USA, 1995. (MPG-95-8)Implementing a QoS Controlled ATM Based Communications System in ChorusRobin, P., G. Coulson, A. Campbell, G. Blair, and M. PapathomasProc. Fourth International Workshop on Protocols for HighPerformance Networks, Vancouver, Canada, 1994. (not on FTP server)Continuous Media Communications in a Micro-Kernel EnvironmentCoulson, G., and G.S. BlairIEEE Second IEEE Workshop on High-Performance CommunicationsSubsystems, Williamsberg, Virginia, 1993. (not on FTP server)Supporting End-to-End Quality of Service in a Micro-Kernel EnvironmentBlair, G.S., G. Coulson, P. Robin, and M. PapathomasProc. Workshop on Communications and Distributed Systems: NewTechnologies, New Requirements, Grenoble, France, 1994. (not on FTPserver)All the papers from this project, in addition to those produced by related projects at Lancaster,can be found here.Here are two files for Andrew Campbell: hereSUMO Home Page / Geoff Coulson / geoff@comp.lancs.ac.uk |
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