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WCET Analysis of Component-Based Systems using Timing Traces
Publication Type:
Conference/Workshop Paper
Venue:
Proceedings of the 16th IEEE International Conference on Engineering of Complex Computer Systems (ICECCS 2011)
Abstract
Construction of a Real-Time System (RTS) out of
a number of pre-fabricated pieces of software, otherwise known
as components, is a pervasive area of interest. Typically, only
relocatable object code of the component is shipped to the
customer, so that it can later be linked into the overall application.
Source code is therefore withheld, and disassembling of the object
code is normally disallowed to protect intellectual property. Both
of these restrictions complicate, or even prevent, state-of-the-art
Worst-Case Execution Time (WCET) analysis of the RTS since
most techniques are grounded on their availability in order to
generate a complete program model. The alternative solution
widespread in industrial circles is to record the largest endto-
end execution time of the RTS under functional testing, but
this underestimates the actual WCET, in the general case.
This paper shows how to obtain a safer WCET estimate of
a RTS composed of components using time-stamped traces of
program execution. In effect, the data needed in the WCET
computation (program model, execution times, execution bounds)
are derived exclusively from parsing of the traces. Experiments
indicate that, once simple coverage metrics have been obtained,
the calculated WCET estimate bounds the actual WCET. Moreover,
where instrumentation (which produces the time-stamped
traces) is placed with respect to program structure has a
significant bearing on the accuracy of the computed WCET
estimate.
Bibtex
@inproceedings{Betts2087,
author = {Adam Betts and Amine Marref},
title = {WCET Analysis of Component-Based Systems using Timing Traces},
month = {April},
year = {2011},
booktitle = {Proceedings of the 16th IEEE International Conference on Engineering of Complex Computer Systems (ICECCS 2011)},
publisher = {IEEE},
url = {http://www.es.mdu.se/publications/2087-}
}