DocumentCode :
2608395
Title :
Accounting for clock frequency variation in the analysis of distributed factory control systems
Author :
Henderson, William ; Kendall, David ; Robson, Adrian
Author_Institution :
Sch. of Comput. & Math., Northumbria Univ., Newcastle upon Tyne, UK
fYear :
2000
fDate :
2000
Firstpage :
51
Lastpage :
58
Abstract :
Microcontrollers are now widely deployed as components in distributed systems. Temporal predictability is often important for such embedded systems-i.e., software must execute within specified time bounds to maintain safe operation of the system as a whole. Microcontroller clocks exhibit random variation in resonant frequency from one component to another, a temperature sensitivity and gradual changes with time. Thus, the execution speed of software will vary when implemented on different processors of the same class. We highlight the vulnerability of standard scheduling analysis in the presence of clock frequency uncertainty when applied to the performance prediction of distributed embedded systems. We propose a modified scheduling analysis to account for the inevitable range of processor clock rates in embedded distributed systems and confirm our analysis by an empirical study using a CAN for inter-processor communication
Keywords :
clocks; controller area networks; embedded systems; industrial control; microcontrollers; performance evaluation; processor scheduling; CAN; clock frequency uncertainty; clock frequency variation; distributed embedded systems; distributed factory control system analysis; embedded systems; inter-processor communication; microcontrollers; performance prediction; processor clock rates; resonant frequency; scheduling analysis; software execution speed; temperature sensitivity; temporal predictability; Clocks; Embedded software; Microcontrollers; Performance analysis; Processor scheduling; Resonant frequency; Software maintenance; Software safety; Software systems; Temperature sensors;
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.2000.882533
Filename :
882533
Link To Document :
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