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A utilization bound for aperiodic tasks and priority driven scheduling

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3 Author(s)
Abdelzaher, T.F. ; Dept. of Comput. Sci., Virginia Univ., Charlottesville, VA, USA ; Sharma, V. ; Chenyang Lu

Real-time scheduling theory offers constant-time schedulability tests for periodic and sporadic tasks based on utilization bounds. Unfortunately, the periodicity or the minimal interarrival-time assumptions underlying these bounds make them inapplicable to a vast range of aperiodic workloads such as those seen by network routers, Web servers, and event-driven systems. This paper makes several important contributions toward real-time scheduling theory and schedulability analysis. We derive the first known bound for schedulability of aperiodic tasks. The bound is based on a utilization-like metric we call synthetic utilization, which allows implementing constant-time schedulability tests at admission control time. We prove that the synthetic utilization bound for deadline-monotonic scheduling of aperiodic tasks is 1/1+√1/2. We also show that no other time-independent scheduling policy can have a higher schedulability bound. Similarly, we show that EDF has a bound of 1 and that no dynamic-priority policy has a higher bound. We assess the performance of the derived bound and conclude that it is very efficient in hit-ratio maximization.

Published in:

Computers, IEEE Transactions on  (Volume:53 ,  Issue: 3 )

Date of Publication:

Mar 2004

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