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Evaluating policies and mechanisms to support distributed real-time applications with CORBA

CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2001年第7期13卷 507-541页

作者： O'Ryan, C Schmidt, DC Kuhns, F Spivak, M Parsons, J Pyarali, I Levine, DL Univ Calif Irvine Dept Elect & Comp Engn Irvine CA 92697 USA Washington Univ Dept Comp Sci St Louis MO 63130 USA

To be an effective platform for performance-sensitive real-time systems, commodity-off-the-shelf (COTS) distributed object computing (DOC) middleware must support application quality of service (QoS) requirements end-to-end. However, conventional COTS DOC middleware does not provide this support, which makes it unsuited for applications with stringent latency, determinism, and priority preservation requirements. It is essential, therefore, to develop standards-based, COTS DOC middleware that permits the specification, allocation. and enforcement of application QoS requirements end-to-end. The real-time CORBA and messaging specifications in the CORBA 2.4 standard are important steps towards defining standards-based, COTS DOC middleware that can deliver end-to-end QoS support at multiple levels in distributed and embedded real-time systems. These specifications still lack sufficient detail, however, to portably configure and control processor, communication, and memory resources for applications with stringent QoS requirements. This paper provides four contributions to research on real-time DOC middleware, First, we illustrate how the CORBA 2.4 real-time and messaging specifications provide a starting point to address the needs of an important class of applications with stringent real-time requirements. Second, we illustrate how the CORBA 2.4 specifications are not sufficient to solve all the issues within this application domain. Third, we describe how we have implemented portions of these specifications, as well as several enhancements, using TAO, which is our open-source real-time CORBA ORE. Finally, we evaluate the performance of TAO empirically to illustrate how its features address the QoS requirements for certain classes of real-time applications, Copyright (C) 2001 John Wiley & Sons, Ltd.

关键词： real-time CORBA patterns and frameworks distributed and real-time middleware

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Evaluating policies and mechanisms for supporting embedded, real-time applications with CORBA 3.0

Evaluating policies and mechanisms for supporting embedded, ...

引用

6th IEEE real-time Technology and Applications Symposium (RTAS 2000)

作者： O'Ryan, C Schmidt, DC Kuhns, F Spivak, M Parsons, J Pyarali, I Levine, DL Univ Calif Irvine Dept Elect & Comp Engn Irvine CA 92697 USA

ISBN: (纸本)0769507131

To be an effective platform for performance-sensitive real-time systems, commercial-off-the-shelf(COTS) distributed object computing (DOC) middleware must support application quality of service (QoS) requirements end-to-end. However conventional DOC middleware does not provide this support, which makes it unsuited for applications, with stringent latency, determinism, and priority preservation requirements. It is essential, therefore, to develop standards-based, COTS DOC middleware that permits the specification allocation, and enforcement of application QoS requirements end-to-end. The real-time CORBA and Messaging specifications in the forthcoming CORBA 3.0 standard are important steps towards defining standards-based, COTS DOC middleware that can deliver end-to-end QoS support at multiple levels in distributed and embedded real-rime systems. However these specifications still lack sufficient detail to portably configure and control processor;communication, and memory resources for applications with stringent QoS requirements. This paper provides four contributions to research err realtime DOC middleware. First, we illustrate how the CORBA 3.0 real-time and Messaging specifications provide a starting point for addressing the needs of an important class of applications with stringent real-time requirements. Second, we illustrate how the CORBA 3.0 specifications are not sufficient to solve all the issues within this application domain. Third, we describe how we have implemented portions of these specifications, as well as several enhancements, using TAO, which is our open-source real-time CORBA ORB. Finally we empirically evaluate the performance of TAO to illustrate how its features address the QoS requirements of certain types of realtime applications.

关键词： real-time CORBA patterns and frameworks distributed and real-time middleware

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