Schedulability Analysis on Generalized Quantum-Based Fixed Priority Scheduling

Moonju PARK 

Publication
IEICE TRANSACTIONS on Information and Systems  Vol.E92-D  No.2  pp.332-335
Publication Date: 2009/02/01
Online ISSN: 1745-1361
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Dependable Computing
Keyword: 
real-time scheduling,  quantum-based scheduling,  fixed priority, 

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Summary: 
This letter analyzes quantum-based scheduling of real-time tasks when each task is allowed to have a different quantum size. It is shown that generalized quantum-based scheduling dominates preemption threshold scheduling in the sense that if tasks are schedulable by preemption threshold scheduling then the tasks must be schedulable by generalized quantum-based scheduling, but the converse does not hold. To determine the schedulability of tasks in quantum-based scheduling, a method to calculate the worst case response time is also presented.