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Title: Deterministic On-Line Routing on Area-Universal Networks
Authors: Bay, Paul Edwin
Bilardi, Gianfranco
Keywords: computer science
technical report
Issue Date: Sep-1991
Publisher: Cornell University
Abstract: Two deterministic routing networks are presented: the pruned butterfly and the sorting fattree. Both networks are area-universal, i.e., they can simulate any other routing network fitting in similar area with polylogarithmic slowdown. Previous area-universal networks were either for the off-line problem, where the message set to be routed is known in advance and substantial precomputation is permitted, or involved randomization, yielding results that hold only with high probability. The two networks introduced here are the first that are simultaneously deterministic and on-line, and they use two substantially different routing techniques. The performance of their routing algorithms depends on the difficulty of the problem instance, which is measured by a quantity $\lambda$ known as the load factor. The pruned butterfly algorithm runs in time $O$($\lambda$ log$^{2}$ $N$), where $N$ is the number of possible sources and detinations for messages and $\lambda$ is assumed to be poylnomial in $N$. The sorting fat-tree algorithm runs in $O$ ($\lambda$ log $N$ + log$^{2}$ $N$) time for a restricted class of message sets including partial permutations. Other results of this work include a new type of sorting circuit and an area-time lower bound for routers.
Appears in Collections:Computer Science Technical Reports

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