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In-Place Parallel Super Scalar Samplesort (IPSSSSo)

Authors Michael Axtmann, Sascha Witt, Daniel Ferizovic, Peter Sanders

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Michael Axtmann
Sascha Witt
Daniel Ferizovic
Peter Sanders

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Michael Axtmann, Sascha Witt, Daniel Ferizovic, and Peter Sanders. In-Place Parallel Super Scalar Samplesort (IPSSSSo). In 25th Annual European Symposium on Algorithms (ESA 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 87, pp. 9:1-9:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017) https://doi.org/10.4230/LIPIcs.ESA.2017.9

Abstract

We present a sorting algorithm that works in-place, executes in parallel, is cache-efficient, avoids branch-mispredictions, and performs work O(n log n) for arbitrary inputs with high probability. The main algorithmic contributions are new ways to make distribution-based algorithms in-place: On the practical side, by using coarse-grained block-based permutations, and on the theoretical side, we show how to eliminate the recursion stack.  Extensive experiments shw that our algorithm IPSSSSo scales well on a variety of multi-core machines. We outperform our closest in-place competitor by a factor of up to 3.  Even as a sequential algorithm, we are up to 1.5 times faster than the closest sequential competitor, BlockQuicksort.

Subject Classification

Keywords
  • shared memory
  • parallel sorting
  • in-place algorithm
  • comparison-based sorting
  • branch prediction

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