NDLI: Handling mixed sets of tasks in combined offline and online scheduled real-time systems

Content Provider	Springer Nature Link
Author	Isovic, Damir Fohler, Gerhard
Copyright Year	2009
Abstract	Many industrial applications with real-time demands are composed of mixed sets of tasks with a variety of requirements. These can be in the form of standard timing constraints, such as period and deadline, or complex, e.g., to express application specific or nontemporal constraints, reliability, performance, etc. As many algorithms focus on specific sets of task types and constraints only, system design has to focus on those supported by a particular algorithm, at the expense of the rest.In this paper, we present a method to deal with a combination of mixed sets of tasks and constraints: periodic tasks with complex and simple constraints, soft and firm aperiodic, and sporadic tasks. We propose the use of an offline scheduler to manage complex timing and resource constraints of periodic tasks and transform these into a simple EDF model with start-times and deadlines. At run-time, the execution of the offline scheduled tasks is flexibly shifted in order to allow for feasible inclusion of dynamically arriving sporadic and aperiodic tasks. Sporadic tasks are guaranteed offline based on their worst-case activation frequencies. At run-time, this pessimism is reduced by the online algorithm which uses the exact knowledge about sporadic arrivals to reclaim resources and improve response times and acceptance of firm aperiodic tasks.
Starting Page	296
Ending Page	325
Page Count	30
File Format	PDF
ISSN	09226443
Journal	Real-Time Systems
Volume Number	43
Issue Number	3
e-ISSN	15731383
Language	English
Publisher	Springer US
Publisher Date	2009-08-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Real-time scheduling Sporadic tasks Complex task constraints Joint offline and online scheduling Control , Robotics, Mechatronics Communications Engineering, Networks Performance and Reliability Special Purpose and Application-Based Systems Computer Systems Organization and Communication Networks
Content Type	Text
Resource Type	Article
Subject	Control and Optimization Computer Networks and Communications Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications Modeling and Simulation

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