The impact of predictive inaccuracies on execution scheduling

Authors:
Stephen A. Jarvis;Ligang He;Daniel P. Spooner;Graham R. Nudd
Affiliations:
High Performance Systems Group, Department of Computer Science, University of Warwick, Coventry CV4 7AL, UK;High Performance Systems Group, Department of Computer Science, University of Warwick, Coventry CV4 7AL, UK;High Performance Systems Group, Department of Computer Science, University of Warwick, Coventry CV4 7AL, UK;High Performance Systems Group, Department of Computer Science, University of Warwick, Coventry CV4 7AL, UK
Venue:
Performance Evaluation - Performance modelling and evaluation of high-performance parallel and distributed systems
Year:
2005

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Abstract

This paper investigates the underlying impact of predictive inaccuracies on execution scheduling, with particular reference to execution time predictions. This study is conducted from two perspectives: from that of job selection and from that of resource allocation, both of which are fundamental components in execution scheduling. A new performance metric, termed the degree of misperception, is introduced to express the probability that the predicted execution times of jobs display different ordering characteristics from their real execution times due to inaccurate prediction. Specific formulae are developed to calculate the degree of misperception in both job selection and resource allocation scenarios. The parameters which influence the degree of misperception are also extensively investigated. The results presented in this paper are of significant benefit to scheduling approaches that take into account predictive data; the results are also of importance to the application of these scheduling techniques to real-world high-performance systems.