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Utilization based schedulability bounds for age constraint process sets in real-time systems
Responsible organisation
2002 (English)In: Real-time systems, ISSN 0922-6443, E-ISSN 1573-1383, 273-295 p.Article in journal (Refereed) Published
Abstract [en]

Some real-time systems consist of a number of processes that operate under age constraints. In such systems, the maximum time from the start of process L-i in cycle k to the end in cycle k+1 must not exceed the age constraint A(i) for that process. The age constraint can be met by using fixed priority scheduling and periods equal to A(i)/2. However, this approach restricts the number of process sets which are schedulable. In this paper, we define a method for obtaining process periods other than A(i)/2. The periods are calculated in such a way that the age constraints are met. Our approach is better in the sense that a larger number of process sets can be scheduled compared to using periods equal to A(i)/2. The main results in this paper are a number of performance bounds on age constraint processes. These bounds show that there is a significant gain in worst case as well as in best case behavior by using periods other than A(i)/2, particularly when there are a large number of processes in the system.

Place, publisher, year, edition, pages
DORDRECHT: KLUWER ACADEMIC PUBL , 2002. 273-295 p.
Keyword [en]
age constraint, scheduling, performance bounds, harmonic periods, real-time
National Category
Software Engineering
Identifiers
URN: urn:nbn:se:bth-8105ISI: 000177986900004Local ID: oai:bth.se:forskinfo3D8BB37507764AAEC12575B000216B25OAI: oai:DiVA.org:bth-8105DiVA: diva2:835793
Available from: 2012-09-18 Created: 2009-05-08 Last updated: 2015-06-30Bibliographically approved

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