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Toward a universal mapping algorithm for accessing trees in parallel memory systems

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5 Author(s)
Auletta, V. ; Dipt. di Inf. ed Applicazioni, Salerno Univ., Italy ; Das, S.K. ; De Vivo, A. ; Pinotti, M.C.
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The authors study the problem of mapping the N nodes of a complete t-ary tree on M memory modules so that they can be accessed in parallel by templates, i.e. distinct sets of nodes. Typical templates for accessing trees are subtrees, root-to-leaf paths, or levels which are referred to as elementary templates. They first propose a new mapping algorithm for accessing both paths and subtrees of size M with an optimal number of conflicts (i.e., only one conflict) when the number of memory modules is limited to M. They also propose another mapping algorithm for a composite template, say 𝒱 (as versatile), such that its size is not fixed and an instance of 𝒱 is composed of any combination of c instances of elementary templates. The number of conflicts for accessing an S-node instance of template 𝒱 is O(S/√M log M+c) and the memory load is 1+o(1) where load is defined as the ratio between the maximum and minimum number of data items mapped onto each memory module

Published in:

Parallel Processing Symposium, 1998. IPPS/SPDP 1998. Proceedings of the First Merged International ... and Symposium on Parallel and Distributed Processing 1998

Date of Conference:

30 Mar-3 Apr 1998

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