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Improving Predictability and Resource Utilization in Component-Based Embedded Real-Time Systems
Publication Type:
Doctoral Thesis
Publisher:
Mälardalen University Press
Abstract
With increase of software complexity and demands for improved development
efficiency, there is a need for new technologies and methods that can cope
with these challenges. In certain business domains, such as distributed webbased
systems and office applications, Component-Based Software Engineering
(CBSE) has demonstrated advantages in achieving reusability of software
components, shorter time to market and increased quality. Due to these advantages
the approach is attractive also for other application domains, in particular
for Embedded Real-Time Systems (ERTS). However, applying CBSE to ERTS
is not trivial since ERTS have requirements related to timing and resources usage.
One of the major challenges in providing CBSE for ERTS is to achieve
performance efficiency and predictability while maintaining reusability. In this
thesis we address this challenge, and three novel solutions are presented for improving
predictability and utilization of resources in component-based ERTS.
The first solution is a contract-based technique to achieve reuse of Worst-
Case Execution Times (WCET) predictions in conjunction with reuse of software
components. For resource constrained systems where a high degree of
predictability is needed, classical techniques for WCET-estimation may result
in unacceptable overestimations for reusable software components. Our solution
allows different WCETs to be associated with subsets of the component
behaviour. The appropriate WCET for any usage context of the component is
selected by means of component contracts over the componentâs input domain.
The second solution is a method for deriving the input combinations of a
software component that produces the WCET. The information resulting from
this method can be used, e.g., for guiding measurement-basedWCET analysis.
The third solution is a framework for transformation of components to the
real-time tasks aiming at providing efficient utilisation of resources. Efficient
allocations can reduce memory usage and CPU-overhead considerably.
In addition this thesis demonstrates how the solutions can be incorporated in the CBSE development process. Furthermore, two tools have been implemented
and used for the evaluation of the research results; the evaluations show
that by using the methods outlined in the thesis resource efficiency and predictability
can be substantially increased without negative impact on reuse.
Bibtex
@phdthesis{Fredriksson1371,
author = {Johan Fredriksson},
title = {Improving Predictability and Resource Utilization in Component-Based Embedded Real-Time Systems},
number = {65},
month = {October},
year = {2008},
school = {M{\"a}lardalen University Press},
url = {http://www.es.mdu.se/publications/1371-}
}