Cache Oblivious Distribution Sweeping

Gerth Stølting Brodal and Rolf Fagerberg

Technical Report, BRICS-RS-02-18, BRICS, Department of Computer Science, Aarhus University, 21 pages, 2009.


We adapt the distribution sweeping method to the cache oblivious model. Distribution sweeping is the name used for a general approach for divide-and-conquer algorithms where the combination of solved subproblems can be viewed as a merging process of streams. We demonstrate by a series of algorithms for specific problems the feasibility of the method in a cache oblivious setting. The problems all come from computational geometry, and are: orthogonal line segment intersection reporting, the all nearest neighbors problem, the 3D maxima problem, computing the measure of a set of axis-parallel rectangles, computing the visibility of a set of line segments from a point, batched orthogonal range queries, and reporting pairwise intersections of axis-parallel rectangles. Our basic building block is a simplified version of the cache oblivious sorting algorithm Funnelsort of Frigo et al., which is of independent interest.

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BIBTEX entry

  author = "Gerth St{\o}lting Brodal and Rolf Fagerberg",
  institution = "BRICS, Department of Computer Science, Aarhus University",
  issn = "0909-0878",
  number = "BRICS-RS-02-18",
  pages = "21",
  title = "Cache Oblivious Distribution Sweeping",
  year = "2009"