In this paper we consider parallel processing of a graph represented by a database relation, and we achieved t w o objectives. First, we propose a methodology f o r analyzing the speedup of a parallel processing strategy with the purpose of selecting at run-time one of several candidate strategies, depending on the hardware architecture and the input graph. Second, we study the single-source reachability problem, namely the problem of computing the set of nodes reachable f r o m a given node in a directed graph. W e propose several parallel strategies f o r solving this problem, and we analyze their performance using our new methodology. The analysis is confirmed experimentally in a UNIX-E t h ern et environment.
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