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Nonnumerical Algorithms (Session 5.2)

Parallel dynamic programming algorithms

Marinus Veldhorst1

(1)  Department of Computer Science, University of Utrecht, P.O.Box 80.012, 3508 TA Utrecht, The Netherlands
Abstract
This paper presents a number of parallel algorithms for the dynamic programming problem

$$\begin{gathered}c(i,i) = 0   (0 \leqslant i \leqslant n) \hfill \\\mathop {c(i,j) = w(i,j) + \min  (c(i,m - 1) + c(m,j))}\limits_{i < m \leqslant j}  \hfill \\\end{gathered} $$
Sequential algorithms run in O(n 3) time or, if the quadrangle inequality holds (cf. [7]), in O(n 2) time. For the former we design parallel algorithms that run in O(n 3/p) time on p<n 2 processing elements (PEs). It is also shown that dynamic programming problems satisfying the quadrangle inequality can be solved in O(n 2/p+n log p) time using p (1<plen) PEs. A global shared memory is assumed. Moreover, we design a systolic array for computing the c(i,j)'s that runs in linear time using p (n 2) PEs.
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