Naval Postgraduate School
A technique for predictable real-time execution in the AN/UYS-2 parallel signal processing architecture
techniqueforpred00litt.pdf (7.227Mb)Abstract
The AN/UYS-2 provides the Navy with a state of the art Digital Signal Processor. The AN-UYS-2 is programmed utilizing the Processing Graph Methodology (PGM), which represents specific tasks as nodes in a graph. It utilizes a simple First-Come-First Served (FCFS) run-time resource allocation mechanism that supports large-grain data flow processing. While the mechanism is robust, easy to implement, and results in low run-time overhead, it is difficult to predict of a given PGM will meet the application requirements. Therefor, an approach that uses compile-time analysis to exploit the periodic arrival of data and a priori knowledge of the amount of computation and communication overhead is investigated. Improvement in performance of the machine when the PGM graphs are restructures using this approach, called Revolving Cylinder scheduling, is observed; and it is found to be effective when there is a high communication overhead or when the PGM nodes are of uniform size.
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