On the Meaning of pWCET Distributions and their use in Schedulability Analysis
R.I. Davis, A. Burns and D. Griffin
This short paper accompanies the keynote talk at RTSOPS 2017. It discusses the different meanings attached to probabilistic Worst-Case Execution Time (pWCET) distributions derived from Static Probabilistic Timing Analysis (SPTA) and Measurement- Based Probabilistic Timing Analysis (MBPTA). These different meanings relate to aleatoric variability (randomness in the systems and its environment) and epistemic uncertainty (lack of knowledge about the system) respectively. The different meanings have significant implications in terms of the valid use of pWCET distributions in probabilistic schedulability analysis.
BibTex Entry
@inproceedings{Davis2017,
author = {R.I. Davis and A. Burns, and D. Griffin},
booktitle = {Real-Time Scheduling Open Problems Seminar},
month = {June},
title = {On the Meaning of pWCET Distributions and their use in Schedulability Analysis},
year = {2017}
}