On new scheduling policy for the improvement of firm RTDBSs performances

  • Authors:
  • Samy Semghouni;Laurent Amanton;Bruno Sadeg;Alexandre Berred

  • Affiliations:
  • UFR Sciences et Techniques, Université du Havre, 25 rue Philippe Lebon, BP 540, 76058 Le Havre Cedex, France;UFR Sciences et Techniques, Université du Havre, 25 rue Philippe Lebon, BP 540, 76058 Le Havre Cedex, France;UFR Sciences et Techniques, Université du Havre, 25 rue Philippe Lebon, BP 540, 76058 Le Havre Cedex, France;UFR Sciences et Techniques, Université du Havre, 25 rue Philippe Lebon, BP 540, 76058 Le Havre Cedex, France

  • Venue:
  • Data & Knowledge Engineering
  • Year:
  • 2007

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Abstract

Earliest deadline first (EDF) is one of the main scheduling policies used in real-time database systems (RTDBSs) for transactions processing. With EDF, prioritized transactions are not necessarily the most important in the system. Moreover, it is well-known that EDF is not efficient in overload conditions. In this paper, we introduce the notion of transaction importance and present a new priority assignment technique based on both transactions importance and deadlines. This assignment policy leads to a new scheduling policy, called generalized earliest deadline first (GEDF). In order to show the benefits of using GEDF for managing real-time transactions, we have designed an RTDBS simulator and carried out Monte Carlo simulations.