An integrated platform which is capable of meeting the requirements of both traditional real-time control processing and multimedia processing has enormous potential for accommodating various kinds of new applications. However, except for the simplest of situations, few, i f any, research or commercial systems successfully provide architectural and OS mechanisms which can efficiently support both hard real-time computation and multimedia soft real-time computation. In this paper, we propose a multimedia server executing on multiprocessor real-time operating systems to provide diferent classes of guarantee to support both types of processing. The multimedia server supports multiplepenodic multimedia streams with a capability for graceful QoS degradation during system overload. In this paper we (i) develop several multimedia server scheduling algorithms, (ii) evaluate the perjormance of these algorithms, and (iii) discuss realistic system implementation issues on the SGI IRIX/REACTPRO operating system.
REF propose a scheme based on a periodic process (the multimedia server) dedicated to the service of all multimedia requests.
Integrated scheduling of multimedia and hard real-time tasks
17th IEEE Real-Time Systems Symposium
17th IEEE Real-Time Systems Symposium
Computer Science