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Doing More for Less – Cache-Aware Parallel Contraction Hierarchies Preprocessing

Luxen, Dennis; Schieferdecker, Dennis

Abstract:
Contraction Hierarchies is a successful speedup-technique to Dijkstra's seminal shortest path algorithm that has a convenient trade-off between preprocessing and query times. We investigate a shared-memory parallel implementation that uses O(n+m) space for storing the graph and O(1) space for each core during preprocessing. The presented data structures and algorithms consequently exploits cache locality and thus exhibit competitive preprocessing times. The presented implementation is especially suitable for preprocessing graphs of planet-wide scale in practice. Also, our experiments show that optimal data structures in the PRAM model can be beaten in practice by exploiting memory cache hierarchies.



Zugehörige Institution(en) am KIT Institut für Theoretische Informatik (ITI)
Publikationstyp Forschungsbericht
Jahr 2012
Sprache Englisch
Identifikator KITopen-ID: 1000097664
Nachgewiesen in arXiv
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