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Server Mechanisms for Multimedia Applications Scuola Superiore S. Anna, Pisa
 

Summary: Server Mechanisms for Multimedia Applications
Luca Abeni
Scuola Superiore S. Anna, Pisa
luca@hartik.sssup.it
Abstract
This paper focuses on the problem of providing eĘcient run-time support to multi-
media applications in a real-time system, where three types of tasks can coexist simulta-
neously: multimedia, soft real-time, and hard real-time tasks. Hard tasks are guaranteed
based on worst case execution times and minimum inter-arrival times, whereas multime-
dia and soft tasks are served based on mean parameters. The paper describes a server
based mechanism for scheduling soft and multimedia tasks without jeopardizing the a
priori guarantee of hard real-time activities. The performance of the proposed method
is compared with that of similar service mechanisms through extensive simulation ex-
periments and several multimedia applications have been implemented on the HARTIK
kernel.
1 Introduction
Recent evolution of technology makes personal computers powerful enough to handle multi-
media streams, so there is a great interest in providing support to continuous media applica-
tions (CM applications from now on). Nevertheless, allowing CM activities to coexist with
other applications with di erent timing requirements (such as hard, soft real-time, and non

  

Source: Abeni, Luca - Dipartimento di Ingegneria e Scienza dell'Informazione, Universitą di Trento

 

Collections: Computer Technologies and Information Sciences