Fast and Tight Response-Times for Tasks with Offsets.
Publication Type:
Conference/Workshop Paper
Venue:
17th EUROMICRO Conference on Real-Time Systems
Abstract
In previous work, we presented a tight approximate
response-time analysis for tasks with offsets. While providing
a tight bound on response times, the tight analysis
exhibits similarly long execution times as does the traditional
methods for calculating response-times for tasks with
offsets. The existing method for fast analysis of tasks with
offsets is not applicable to the tight analysis.
In this paper we extend the fast analysis to handle the
distinguishing trait of the tight analysis; continuously increasing
interference functions. Furthermore, we provide
another speedup; by introducing pessimism in the modelling
of interference at certain points, we speed up the
convergence of the numerical solving for response-times
without increasing the pessimism of the resulting responsetimes.
The presented fast-and-tight analysis is guaranteed to
calculate the same response-times as the tight analysis, and
in a simulation study we obtain speedups of more than two
orders of magnitude for realistically sized tasks sets compared
to the tight analysis. We also demonstrate that the
fast-and-tight analysis has comparable execution time to
that of the fast analysis. Hence, we conclude that the fastand-
tight analysis is the preferred analysis technique when
tight estimates of response-times are needed, and that we do
not need to sacrifice tightness for analysis speed; both are
obtained with the fast-and-tight analysis.
Bibtex
@inproceedings{Maki-Turja701,
author = {Jukka M{\"a}ki-Turja and Mikael Sj{\"o}din},
title = {Fast and Tight Response-Times for Tasks with Offsets.},
month = {July},
year = {2005},
booktitle = {17th EUROMICRO Conference on Real-Time Systems},
publisher = {IEEE},
url = {http://www.es.mdu.se/publications/701-}
}