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The aggregate server method is an approximate, iterative technique for analyzing the delays that programs encounter while waiting to enter critical sections, non-reentrant subroutines, and similar software structures that cause processing to become serialized. The method employs a conventional product form queuing network comprised of servers that represent actual I/O devices and processors, plus additional aggregate servers that represent serialized processing activity. The parameters of the product form network are adjusted iteratively to account for contention among serialized and nonserialized customers at each physical device.
Agrawal et al. (Sun,) studied this question.
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