WicsaWikiWANParty:WS5
From WICSA Conference Wiki
Subject: Real time systems
Contents |
Short Paper Presentations
Real-Time Collaboration in Activity Based Architectures
Authors: Jakob Bardram, Henrik B Christensen (University of Aarhus)
Presented by Henrik Christensen
Main ideas:
- Human activity as first class citizen. Examples:
- Writing a paper
- Diagnosing a patient
- Real-time aspect: Achieving adequate performance for practical use
A Network Architectural Style for Real-time Systems: NaSr
Authors: Rabih Bashroush, Ivor Spence, Peter Kilpatrick, John Brown (Queens University of Belfast)
Presented by Rabih Bashroush
Main ideas:
- Fit everything into a single service-oriented framework with packet-switched inter-component communication
- Encapsulate COTS by wrappers
- Real-time aspect supported e.g. by timestamps in messages
Discussion
- Main aspect of real-time systems: predictable timing (not necessarily miraculous performance).
- Unfortunately, in most cases this is done by doing experiments instead of building systems predictably from the bottom up.
- Can we maintain these timing guarantees if we increase dynamism in system evolution?
- More generally, can we predict and maintain essential qualities, such as safety, while our systems are changing?
- It seems that users have become more tolerant of system faults, provided they can get the newest and the greatest systems.
- Are architects giving priority to the right quality attributes? Are they too conservative in worrying about safety?
