The Impact of Output Selection Function Choice on the Performance
of Adaptive Wormhole Routing
Abstract
Many adaptive routing algorithms have been proposed for
wormhole-routed interconnection networks. Comparatively little work,
however, has been done on determining how the output selection
function (routing policy) affects the performance of an adaptive
routing algorithm. In this paper, we present a detailed simulation
study of various selection functions for a fully adaptive mesh routing
algorithm. The simulation results show that the choice of selection
function has a significant effect on the average message latency.
Thus, a naive implementation of an adaptive routing algorithm may lead
to poor performance. These selection functions are also compared with
a theoretically optimal selection function (proposed by Badr and
Podar). We show that although theoretically optimal, the actual
performance of the optimal selection function is not best. An
explanation and interpretation of the results is provided.
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Last updated by Loren Schwiebert Email: 
on Jun-06-2001