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Automatic Methods for Hiding Latency in High Bandwidth Networks

Summary: Automatic Methods for
Hiding Latency in High Bandwidth Networks
(Extended Abstract)
Matthew Andrews \Lambda Tom Leighton y P. Takis Metaxas z Lisa Zhang x
In this paper we describe methods for mitigating the
degradation in performance caused by high latencies
in parallel and distributed networks. Our approach is
similar in spirit to the ``complementary slackness'' tech­
nique for latency hiding but has the advantage that the
slackness does not need to be provided by the program­
mer and that large slowdowns are not needed in order
to hide the latency. For example, given any algorithm
that runs in T steps on an n­node ring with unit link
delays, we show how to run the algorithm in O(T ) steps
on any n­node bounded­degree connected network with
average link delay O(1). This is a significant improve­
ment over prior approaches to latency hiding, which
require slowdowns proportional to the maximum link
delay (which can be quite large in comparison to the


Source: Andrews, Matthew - Mathematics of Networks and Systems, Mathematical Sciences Research Center, Bell Laboratories


Collections: Mathematics; Computer Technologies and Information Sciences