Faster Optimal Parallel Prefix Sums And List Ranking
Faster Optimal Parallel Prefix Sums And List Ranking
Richard Cole
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The selection of the ruling set implies that each local maximum or local minimum v is either selected or has a neighbor that is selected. Therefore, v must have been deleted and cannot be included in this input graph). Fact 6: It is easy to deduce that the output graph consists of simple paths each comprising at most loglog n vertices. (Again, we assume for simplicity that loglogn is an integer). The vertices that were selected form a loglogn-ruling set. We have shown: Theorem 3. 1. 2: A loglog...n-ruling set can be obtained in O(l) time using n processors. Ultracomputer Note 117 Page 12 If our original input is a directed path of n vertices, rather than a ring, we obtain a loglogn- ruling set by applying the basic step 2 times, as above. Remark 3. 1. 1: It is interesting to mention that [CV-86a] show how to apply repeatedly the basic step to obtain a 2-ruling set in 0(\og*n) time using n processors. 3. 2. The New 2-ruling Set Algorithm The algorithm presented in this section is based on a few changes to the optimal loga- rithmic time 2-ruling set algorithm of Section 2.
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