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Today's consumer electronic devices feature multiple applications which have to share scarcely available resources. We consider a priority-processing-based video application, which comprises multiple scalable video algorithms (SVAs) that are executed on a shared, virtual platform. This application is given a guaranteed processor share by means of a constant-bandwidth server (CBS), which in addition...
This paper investigates memory management for real-time multimedia applications running on a resource-constrained platform. It is shown how a shared memory pool can reduce the total memory requirements of an application comprised of a data-driven chain of tasks with a time-driven head and tail and a bounded end-to-end latency. The general technique targeted at memory-constrained streaming systems...
In this paper, we consider multimedia Quality-of-Service (QoS) in resource constrained embedded systems, where scalable applications are structured as directed acyclic graphs of tasks, which communicate via shared buffers. Scalable multimedia applications allow to trade quality for resource usage during run-time. We present two QoS problems: (i) temporal dependencies between subchains of tasks due...
This paper presents the design and implementation of RELTEQ, a timed event management algorithm based on relative event times, supporting long event interarrival time, long lifetime of the event queue, no drift and low overhead. It is targeted at embedded operating systems. RELTEQ has been conceived to replace and improve the existing timed event management approach in ??C/OS II, a real-time operating...
A method for ldquopreempting memoryrdquo is presented, where (parts of) the memory allocated to an active task may be reallocated to another task, without corrupting the state of the active task's job. The method is based on combining scalable components with fixed-priority scheduling with deferred preemption (FPDS).Real-time systems composed of scalable components are investigated. A scalable component...
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