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Improved Conditions for Bounded Tardiness under EPDF Fair Multiprocessor Scheduling #
 

Summary: Improved Conditions for Bounded Tardiness under EPDF Fair
Multiprocessor Scheduling #
UmaMaheswari C. Devi and James H. Anderson
Department of Computer Science, The University of North Carolina, Chapel Hill, NC
Abstract
The earliest­pseudo­deadline­first (EPDF ) Pfair al­
gorithm is more e#cient than other known Pfair
scheduling algorithms, but is not optimal on more than
two processors. In earlier work, Srinivasan and Ander­
son established a su#cient per­task utilization restric­
tion for ensuring a tardiness of at most one quantum
under EPDF. They also conjectured that a tardiness
bound of one quantum applies to systems that are not
restricted in any way. In this paper, we present coun­
terexamples that show that this conjecture is false. We
also present su#cient utilization restrictions that are
more liberal than theirs.
Keywords: soft real­time systems, pfairness, real­time
scheduling, multiprocessors, tardiness bounds.
1 Introduction

  

Source: Anderson, James - Department of Computer Science, University of North Carolina at Chapel Hill

 

Collections: Computer Technologies and Information Sciences