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Handling Sporadic Tasks in Off-line Scheduled Distributed Real-Time Systems

Fulltext:


Publication Type:

Conference/Workshop Paper

Venue:

Proceedings of the 11th International EUROMICRO Conference on Real-Time Systems (ECRTS 99)


Abstract

Many industrial applications mandate the use of a time-triggered paradigm and consequently the use of off-line scheduling for reasons such as predictability, certification, cost, or product reuse. The construction of an off-line schedule requires complete knowledge about all temporal aspects of the application. The acquisition of this information may involve unacceptable cost or be impossible. Often, only partial information is available from the controlled environment. In this paper, we present an algorithm to handle event-triggered sporadic tasks, i.e., with unknown arrival times, but known maximum arrival frequencies, in the context of time-triggered, off-line scheduled systems. Sporadic tasks are guaranteed during design time, allowing rescheduling or redesign in the failure case. We provide an off-line schedulability test for sporadic tasks and apply a method to perform on-line scheduling on top of off-line schedules. Since the major part of preparations is performed off-line, the involved on-line mechanisms are very simple.

Bibtex

@inproceedings{Isovic1,
author = {Damir Isovic and Gerhard Fohler},
title = {Handling Sporadic Tasks in Off-line Scheduled Distributed Real-Time Systems},
month = {July},
year = {1999},
booktitle = {Proceedings of the 11th International EUROMICRO Conference on Real-Time Systems (ECRTS 99)},
url = {http://www.es.mdu.se/publications/1-}
}