The design of the TAO real-time object request broker

Schmidt, Douglas C.; Levine, David L.; Mungee, Sumedh

doi:10.1016/s0140-3664(97)00165-5

Cited by 411 publications

(143 citation statements)

References 8 publications

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“…RTZen also includes many of the performance and predictability enhancing techniques pioneered in ZEN [18][19][20] and TAO [21][22][23][24]. For example, RTZen's thread pool implements the Half-Sync/Half-Async pattern [9] to minimize complexity and allow high throughput, and the POA uses active-demux tables to allow O(1) demultiplexing of server-side objects.…”

Section: Scoped Memorymentioning

confidence: 99%

RTZen: Highly Predictable, Real-Time Java Middleware for Distributed and Embedded Systems

et al. 2005

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Abstract. Distributed real-time and embedded (DRE) applications possess stringent quality of service (QoS) requirements, such as predictability, latency, and throughput constraints. Real-Time CORBA, an open middleware standard, allows DRE applications to allocate, schedule, and control resources to ensure predictable end-to-end QoS. The Real-Time Specification for Java (RTSJ) has been developed to provide extensions to Java so that it can be used for real-time systems, in order to bring Java's advantages, such as portability and ease of use, to real-time applications. In this paper, we describe RTZen, an implementation of a Real-Time CORBA Object Request Broker (ORB), designed to comply with the restrictions imposed by RTSJ. RTZen is designed to eliminate the unpredictability caused by garbage collection and improper support for thread scheduling through the use of appropriate data structures, threading models, and memory scopes. RTZen's architecture is also designed to hide the complexities of RTSJ related to distributed programming from the application developer. Empirical results show that RTZen is highly predictable and has acceptable performance. RTZen therefore demonstrates that Real-Time CORBA middleware implemented in real-time Java can meet stringent QoS requirements of DRE applications, while supporting safer, easier, cheaper, and faster development in real-time Java.

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Section: Scoped Memorymentioning

confidence: 99%

RTZen: Highly Predictable, Real-Time Java Middleware for Distributed and Embedded Systems

et al. 2005

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“…The OMG Real-Time CORBA 1.2 specification (RTC1.2) [5] addresses limitations with the fixed-priority mechanisms specified in RTC1 byintroducing two new concepts to Real-time CORBA: (1) distributable threads that are used to map end-to-end QoS requirements to distributed computations across the endsystems they traverse and (2) a scheduling service architecture that allows applications to choose which mechanisms enforce task eligibility. To facilitate the study of standards-based dynamic scheduling middleware, we have implemented a RTC1.2 framework that enhances on our prior work with The ACE ORB (TAO) [6] (a widely-used open-source implementation of Real-time CORBA 1.0 [1]) and its Real-time Scheduling Service (which supports both static [7] and dynamic scheduling [8]). This paper describes how we designed and optimized the performance of our RTC1.2 Dynamic Scheduling framework to address the following design challenges for adaptive DRE systems:…”

Section: Solution Approachmentioning

confidence: 99%

“…The system architecture for our first case study included an OFP consisting of approximately 70 operations, the Boeing Bold Stroke avionics domain-specific middleware layer [16] built upon The ACE ORB (TAO) [6], the TAO Reconfigurable Scheduling Service [7,8], and the TAO Real-Time Event Service [17], configured for various scheduling strategies described in Sections 2 and 3. This middleware isolates applications from the underlying hardware and OS, enabling hardware or OS advances to be integrated more easily with the avionics application.…”

Section: Case Study 1 Effects Of Cancellation Of Non-critical Operationsmentioning

confidence: 99%

Enhancing adaptivity via standard dynamic scheduling middleware

Gill¹,

Mgeta²,

Torri³

et al. 2004

J. Braz. Comp. Soc.

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“…It is based on an extension of the TAO ORB [30] with the concept of architectural awareness, making explicit the architectural structure of a system in a causally connected way. Middleware configurations are defined in terms of prerequisite specifications, which represent the components of the platform and the dependencies among them.…”

Section: Related Workmentioning

confidence: 99%