| 1. |
- Behnam, Moris, et al.
(författare)
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A Hierarchical Approach for Reconfigurable and Adaptive Embedded Systems
- 2008
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Ingår i: Proceedings of the Workshop on Adaptive and Reconfigurable Embedded Systems (APRES'08), Cyber Physical Systems Week, St. Louis, MO, USA. ; s. 51-54
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Konferensbidrag (refereegranskat)abstract
- Adaptive and reconfigurable embedded systems have been gaining an increasing interest in the past year from both academics and industry. This paper presents our work on hierarchical scheduling frameworks (HSF) intended as a backbone architecture facilitating the implementation of operating system support for adaptability and reconfigurability.
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| 2. |
- Behnam, Moris, et al.
(författare)
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A Synchronization Protocol for Hierarchical Resource Sharing in Real-Time Open Systems
- 2007
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Ingår i: In Proceedings of the 7th ACM & IEEE International Conference Embedded Software EMSOFT07. ; s. 279-288
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Konferensbidrag (refereegranskat)abstract
- This paper presents a protocol for resource sharing in a hierarchical real-time scheduling framework. Targeting real-time open systems, the protocol and the scheduling framework significantly reduce the efforts and errors associated with integrating multiple semi-independent subsystems on a single processor. Thus, our proposed techniques facilitate modern software development processes, where subsystems are developed by independent teams (or subcontractors) and at a later stage integrated into a single product. Using our solution, a subsystem need not know, and is not dependent on, the timing behaviour of other subsystems; even though they share mutually exclusive resources. In this paper we also prove the correctness of our approach and evaluate its efficiency.
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| 3. |
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| 4. |
- Behnam, Moris, et al.
(författare)
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Independent Abstraction and Dynamic Slack Reclaiming in Hierarchical Real-Time Open Systems
- 2007
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Ingår i: Proceedings of the Work-In-Progress (WIP) session of the 19th Euromicro Conference on Real-Time Systems (ECRTS'07), Pisa, Italy. ; s. 1-4
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Konferensbidrag (refereegranskat)abstract
- Independent subsystem abstraction allows subsystems to be developed and validated separately and supports an easier subsystem integration. In particular, this approach is desirable in open systems, since it does not require knowledge of temporal behaviour of other subsystems. However, independentabstraction, assuming the worst-case CPU supply pattern, requires extra CPU allocations. We present our work in progress on dynamic slack reclamation, which keeps track of such extra CPU allocations at run time. We are also investigating how to utilize those extra resources for supporting soft real-time tasks.
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| 5. |
- Behnam, Moris, et al.
(författare)
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Real-Time Subsystem Integration in the Presence of Shared Resources
- 2006
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Ingår i: Proceedings of the Work-In-Progress (WIP) session of the 27th IEEE Real-Time Systems Symposium (RTSS'06), Rio de Janeiro, Brazil.
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Konferensbidrag (refereegranskat)abstract
- We present our ongoing work to support the difficult, time consuming, and error-prone process of subsystem integration in the real-time domain. Our work will result in methods where independently developed subsystems, including both hard real-time and soft real-time functions, can be easily integrated without resulting unpredictable timing behaviour. The methods will also facilitate subsystem reuse, since a subsystem can easily be integrated in a new environment. Related research and methods are presented, together with our ongoing work in the area.
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| 6. |
- Behnam, Moris, et al.
(författare)
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Scheduling of Semi-Independent Real-Time Components: Overrun Methods and Resource Holding Times
- 2008
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Ingår i: In Proceedings of the 13th IEEE International Conference on Emerging echnologies and Factory Automation (ETFA’08).
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Konferensbidrag (refereegranskat)abstract
- The Hierarchical Scheduling Framework (HSF) has been introduced as a design-time framework enabling compositional schedulability analysis of embedded software systems with real-time properties. In this paper a system consists of a number of semi-independent components called subsystems. Subsystems are developed independently and later integrated to form a system. To support this design process, our proposed methods allow nonintrusive configuration and tuning of subsystem timing behaviour via subsystem interfaces for selecting scheduling parameters. This paper considers two methods to handle overruns due to resource sharing between subsystems in the HSF. We present the scheduling algorithms for overruns and their associated schedulability analysis, together with analysis that shows under what circumstances one or the other overrun method is preferred. Furthermore, we show how to calculate resource-holding times within our framework.
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| 7. |
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| 8. |
- Behnam, Moris, et al.
(författare)
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SIRAP: A Synchronization Protocol for Hierarchical Resource Sharing in Real-Time Open Systems
- 2007
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Ingår i: Proceedings of the 7th ACM & IEEE International Conference on Embedded Software (EMSOFT'07), Salzburg, Austria. ; s. 279-288
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Konferensbidrag (refereegranskat)abstract
- This paper presents a protocol for resource sharing in a hierarchical real-time scheduling framework. Targeting real-time open systems, the protocol and the scheduling framework significantly reduce the efforts and errors associated with integrating multiple semi-independent subsystemson a single processor. Thus, our proposed techniques facilitate modern software development processes, wheresubsystems are developed by independent teams (or subcontractors)and at a later stage integrated into a single product.Using our solution, a subsystem need not know, and is not dependent on, the timing behaviour of other subsystems;even though they share mutually exclusive resources.In this paper we also prove the correctness of our approach and evaluate its efficiency.
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| 9. |
- Behnam, Moris, et al.
(författare)
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Synchronization protocols for hierarchical real-time scheduling frameworks
- 2008
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Ingår i: Proceedings of the 1st Workshop on Compositional Theory and Technology for Real-Time Embedded Systems (CRTS'08) in conjunction with the 29th IEEE International Real-Time Systems Symposium (RTSS'08), Barcelona, Spain.
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Konferensbidrag (refereegranskat)
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| 10. |
- Behnam, Moris, et al.
(författare)
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Towards Hierarchical Scheduling in VxWorks
- 2008
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Ingår i: OSPERT 2008, Proceedings of the Fourth International Workshop on Operating Systems Platforms for Embedded Real-Time Applications. ; s. 63-72
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Konferensbidrag (refereegranskat)abstract
- Over the years, we have worked on hierarchical schedulingframeworks from a theoretical point of view. In thispaper we present our initial results of the implementationof our hierarchical scheduling framework in a commercialoperating system VxWorks. The purpose of the implementationis twofold: (1) we would like to demonstrate feasibilityof its implementation in a commercial operating system,without having to modify the kernel source code, and (2) wewould like to present detailed figures of various key propertieswith respect to the overhead of the implementation.During the implementation of the hierarchical scheduler,we have also developed a number of simple task schedulers.We present details of the implementation of Rate-Monotonic(RM) and Earliest Deadline First (EDF) schedulers. Finally,we present the design of our hierarchical schedulingframework, and we discuss our current status in the project.
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