Holistic Analysis for Deadline Scheduled Real-Time Distributed Systems
Abstract
The holistic theory is a very interesting approach formerly proposed by Tindell and Clark~\cite{Tin94b} for assessing the feasibility of fixed priority real-time systems. Its major merit is to make the analysis of distributed systems tractable, without being at the same time too pessimistic. In this paper we extend the holistic theory to the analysis of deadline scheduled real-time distributed systems. Owing to its predictability, the Timed Token MAC protocol is assumed to arbitrate network accesses among host processors. Furthermore, in order to achieve a large resource utilization, outgoing packets are assumed to be locally queued earliest deadline first. A procedure for the computation of worst-case message communication delays is also given. The theory described in the paper is validated by means of a case study application, in which worst-case response times of {\em end-to-end} computations are tightly bounded. The example has confirmed the effectiveness of a global deadline scheduling approach.
Loading...