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Real-time continuous multimedia task model and scheduling algorithm
Ruan Junbo, Li Hongbing, Jin Huihua*
School of Computer Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ��ͳ��������ģ�͹��ڼ�,������Ӧʵʱ��ý��������Ķ�����ʽ,���û�Ϊ���ĵ�����ý��ĵ����㷨����δ�ܴ�ȫ���Ͽ�������ķ�������QoS(Quality of Service)����,�������Ч�ʽϵ�.���һ�ָĽ����Զ�ý�����Ϊ������������ģ��,������ģ�͸�����Ŀǰ��ý������Ļ���������ʽ.���ڸ�����ģ��,�����һ����������ý�����������������ֹ���Ϊ���ĵ��������·��ģ��TPP(Task Presentation Path).��ȫ�濼�DZ���·����ý���������ȫ�����ߡ��ֲ����ߺ���������ʧЧ�ʵĻ�����,������������ý�����ı�����Դ��������㷨PSTPP(Proportional Share based on Task Presentation Path).ʵ�������������������������ģ�͵ĺ�����,�����㷨���ṩ�ȴ�ͳ��ʱ�����Լ�EDF�㷨���õ�QoS��֤.
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Abstract�� The oversimplification of traditional periodic task model gives rise to poor flexibility, which can not adapt to multiple forms of real-time media stream applications. User-centered scheduling algorithm for continuous media brings in poor scheduling efficiency, for not considering QoS (quality of service)requirements completely. An improved periodic task model centered on multimedia objects was presented, and the model ould generalize the basic task representative forms of current multimedia applications on the whole. A model called TPP (task presentation path) for continuous media streams was proposed with focus on the whole qualities of presentation for continuous media stream. Considering the overall dead-line, partial periodic dead-line and sequential failure of multimedia stream object in the presentation path, a proportional share CPU scheduling called PSTPP(proportional share based on task presentation path) algorithm was brought forward for continuous multimedia streams. The experimental results show the rationality of models, and the scheduling algorithm can provide better QoS guarantees than the traditional time-sharing and EDF strategies.
Keywords�� real-time   failure   QoS(quality of service)   continuous media   task scheduling     
Received 2004-03-31;
Fund:

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About author: ���(1974-),��,����������,��ʿ��, aruanruan@vip.sina.com.
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���, ����, ��ݻ�.ʵʱ������ý������ģ�ͼ������㷨[J]  �������պ����ѧѧ��, 2005,V31(08): 863-868
Ruan Junbo, Li Hongbing, Jin Huihua.Real-time continuous multimedia task model and scheduling algorithm[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2005,V31(08): 863-868
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