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1st International Symposium on Object-Oriented real-time Distributed computing (ISORC 98)

作者： Nett, E Gergeleit, M Mock, M German Natl Res Ctr Informat Technol GMD Res Div SET RS Respons Syst D-53754 St Augustin Germany

ISBN: (纸本)0818684321

real-time computing is becoming an enabling technology for many important distributed applications such as flexible manufacturing, multimedia, robotics and process control. Traditionally, real-time systems have been realized as isolated embedded systems. Unfortunately, this approach does nor longer suffice for future complex systems in the application scenarios mentioned above. In this situation, the use of an object-oriented design paradigm greatly reduces the complexity of the system while improving reusability and manageability. Furthermore, the surrounding IT-infrastructure is more a,ld more accessible through object-oriented interfaces (e.g. CORBA). In addition, object-oriented modeling allows reflecting the dynamic characteristics of the applications mentioned above by instantiating objects dynamically. In order to meet the real-time requirements in such an environment, static scheduling is not sufficient since many non-predictable resource conflicts influence execution times. Therefore, the most distinguishing requirement of these complex heterogeneous systems is the need of the computing system to dynamically adapt to dynamically changing conditions. Little work has been done on integrating object-oriented system design with resource allocation algorithms that are flexible enough to cope,vith this new requirement. This paper presents an approach for an adaptive object-oriented system with integrated monitoring, dynamic execution rime prediction and scheduling. It explains how this approach is applied to CORBA and C++.

关键词： adaptive real-time computing distributed systems monitoring scheduling CORBA

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Enhancing O-O middleware to become time-aware

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real-time SYSTEMS 2001年第2期20卷 211-228页

作者： Nett, E Gergeleit, M Mock, M Univ Magdeburg Dept Comp Sci Inst Distributed Syst D-39106 Magdeburg Germany German Natl Res Ctr Informat Technol GMD Inst Autonomous Intelligent Syst D-53754 St Augustin Germany

The general trend in middleware moves towards object-orientation. Implementation hiding, inheritance, and polymorphism are concepts, that have turned out to be well suited for the structuring of new complex distributed applications as well as for the integration of legacy systems. The existence of CORBA as a vendor-independent standard for object-oriented middleware has added another momentum to this development. Regarding real-time requirement, however, there exists an obvious trade-off. While implementation hiding isolates module implementations and eases their integration as it allows to simply match interfaces, it ignores the fact that in the real-time domain implementation does matter. To solve this problem, we need a system that is capable to adapt in a predictable manner to dynamic, unpredictable changes in its environment. In this paper we present our approach for an adaptive real-time system. It provides a run-time support system comprising run-time monitoring and on-line, fault-tolerant scheduling as its key components. It can be used to enhance emerging object-oriented de facto standards like CORBA with adequate features to integrate them as "time-aware'' components.

关键词： adaptive real-time computing predictability time-awareness monitoring scheduling algorithms CORBA

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T-CORBA: making object-oriented systems time-aware

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COMPUTER SYSTEMS SCIENCE AND ENGINEERING 1998年第3期13卷 151-160页

作者： Gergeleit, M Mock, M Nett, E German Natl Res Ctr Informat Technol GMD Res Div SETRS Respons Syst D-53754 St Augustin Germany

real-time computing is becoming an enabling technology for many important distributed applications such as flexible manufacturing, multimedia, robotics and process control. Traditionally, real-time systems have been realized as isolated, embedded systems, dedicated to provide the requested service for a single dedicated application. Unfortunately, the solutions provided for that do no longer suffice for more complex systems as they are encountered in many of the above-mentioned applications. These applications are often closely integrated with the surrounding IT-infrastructure and often they have to interact with external services (often implemented as CORBA services). In such a scenario, static run-time prediction for scheduling and static guarantees of timing assertions is impossible since many non-predictable interaction elements influence execution times. Therefore, the most distinguishing requirement of these complex heterogeneous systems is the need of the computing system to dynamically adapt to dynamically changing conditions. Little work has been done on (operating) system mechanisms and algorithms, flexible enough to cope with this new requirement. This paper presents an approach for an adaptive object-oriented system with integrated monitoring and scheduling. It explains a generic approach for monitoring and prediction of execution times that reduces the influence of data dependencies by exploiting the object-oriented design and describes T-CORBA, an implementation architecture for applying this approach to a CORBA environment.

关键词： adaptive real-time computing monitoring scheduling CORBA

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Guaranteeing real-time Behaviour in adaptive Distributed Systems

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IFAC Proceedings Volumes 1998年第20期31卷 1141-1146页

作者： E. Nett M. Gergeleit M. Mock German National Research Center for Information Technology (GMD) Research Division SET-RS (Responsive Systems) D-53754 St. Augustin Germany http://set.gmd.de/RS/

Traditionally, real-time systems have been realized as isolated, embedded systems. Unfortunately, this approach does not longer suffice for future complex systems in application scenarios like flexible manufacturing, multimedia, robotics and process control. Often, there is a need to integrate external services through non real-time, object-oriented interfaces (e.g. CORBA).The most distinguishing requirement for these complex real-time systems is the need to adapt to dynamically changing conditions. Little work has been done on (operating) system mechanisms and algorithms that are flexible enough to cope with this new requirement. This paper presents an approach for an adaptive object-oriented system with integrated monitoring, dynamic execution time prediction and scheduling. Its applicability in a CORBA-like environment is exhibited.

关键词： adaptive real-time computing distributed systems monitoring scheduling algorithms CORBA

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