DocumentCode :
2608782
Title :
Heuristic techniques for allocating and scheduling communicating periodic tasks in distributed real-time systems
Author :
Faucou, Sebastien ; Déplanche, Anne-Marie ; Beauvais, Jean-Pierre
Author_Institution :
IRCCyN, Nantes, France
fYear :
2000
fDate :
2000
Firstpage :
257
Lastpage :
265
Abstract :
This paper deals with the problem of pre-runtime allocating and scheduling communicating periodic tasks in a distributed real-time system. The task system is modeled with independent periodic macro-tasks. The physical architecture consists of a network of identical monoprocessor sites, fully connected by a bus. Two medium access control protocols are considered : CSMA/CA and TDMA. Our objective is to find an allocation of tasks to sites and a subsequent schedule for them such that the periodicity and precedence constraints are satisfied. Besides dealing with these constraints (which is often the sole concern of many studies), the effective communication delays due to the message scheduling and the bus access control protocol are taken into account when the task schedule is being built. Two algorithms for solving this problem are presented: a clustering algorithm and a genetic algorithm
Keywords :
carrier sense multiple access; delays; genetic algorithms; protocols; real-time systems; time division multiple access; CSMA/CA; TDMA; bus access control protocol; clustering algorithm; communicating periodic tasks scheduling; distributed real-time systems; genetic algorithm; heuristic techniques; medium access control protocols; monoprocessor sites; periodic macro-tasks; periodicity; precedence constraints; task allocation; Access control; Access protocols; Clustering algorithms; Communication effectiveness; Delay effects; Genetic algorithms; Media Access Protocol; Multiaccess communication; Real time systems; Time division multiple access;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Factory Communication Systems, 2000. Proceedings. 2000 IEEE International Workshop on
Conference_Location :
Porto
Print_ISBN :
0-7803-6500-3
Type :
conf
DOI :
10.1109/WFCS.2000.882557
Filename :
882557
Link To Document :
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