This paper describes a parallel proximity detection algorithni and illustrates its application to the probleni of conflict detection in an aviation siniulation. The algorithni invokes a previously designed sequential furiction in parallel, using spatial information acquired during the traversal of a quad tree, to keep the separate invocations of the furiction as independent as possible. The method is generally applicable to any function (not just coriflict detection) whose arguments are spatially organized. Enipirical results show that a single-threaded version of the algorithni sped up the sinidation by 57%, while a four-threaded parallel version extracted 30% of the remaining additional speedup. These results are even niore noteworthy given that the architecture of the sinidation reniains intact; we only replace the irivocatiori niechanisni for one function.
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