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• W2096169342 abstract "This paper presents a design synthesis method for distributed embedded systems. In such systems, computations can flow through long pipelines of interacting software components, hosted on a variety of resources, each of which is managed by a local scheduler. Our method automatically calibrates the local resource schedulers to achieve the system's global end-to-end performance requirements. A system is modeled as a set of distributed task chains (or pipelines), where each task represents an activity requiring nonzero load from some CPU or network resource. Task load requirements can vary stochastically due to second-order effects like cache memory behavior, DMA interference, pipeline stalls, bus arbitration delays, transient head-of-line blocking, etc. We aggregate these effects-along with a task's per-service load demand and model them via a single random variable, ranging over an arbitrary discrete probability distribution. Load models can be obtained via profiling tasks in isolation or simply by using an engineer's hypothesis about the system's projected behavior. The end-to-end performance requirements are posited in terms of throughput and delay constraints. Specifically, a pipeline's delay constraint is an upper bound on the total latency a computatation can accumulate, from input to output. The corresponding throughput constraint mandates the pipeline's minimum acceptable output rate-counting only outputs which meet their delay constraints. Since per-component loads can be generally distributed; and since resources host stages from multiple pipelines, meeting all of the system's end-to-end constraints is a nontrivial problem. Our approach involves solving two subproblems in tandem: 1) finding an optimal proportion of load to allocate to each task and channel and 2) deriving the best combination of service intervals over which all load proportions can be guaranteed. The design algorithms use analytic approximations to quickly estimate output rates and propagation delays for candidate solutions. When all parameters are synthesized, the estimated end-to-end performance metrics are rechecked by simulation. The per-component load reservations can then be increased, with the synthesis algorithms rerun to improve performance. At that point, the system can be configured according to the synthesized scheduling parameters-and then revalidated via on-line profiling. In this paper, we demonstrate our technique on an example system, and compare the estimated performance to its simulated on-line behavior." @default.
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• W2096169342 date "2000-01-01" @default.
• W2096169342 modified "2023-09-23" @default.
• W2096169342 title "Parametric design synthesis of distributed embedded systems" @default.
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• W2096169342 doi "https://doi.org/10.1109/12.895934" @default.
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