k-ary search on modern processors

This paper presents novel tree-based search algorithms that exploit the SIMD instructions found in virtually all modern processors. The algorithms are a natural extension of binary search: While binary search performs one comparison at each iteration, thereby cutting the search space in two halves, our algorithms perform k comparisons at a time and thus cut the search space into k pieces. On traditional processors, this so-called k-ary search procedure is not beneficial because the cost increase per iteration offsets the cost reduction due to the reduced number of iterations. On modern processors, however, multiple scalar operations can be executed simultaneously, which makes k-ary search attractive. In this paper, we provide two different search algorithms that differ in terms of efficiency and memory access patterns. Both algorithms are first described in a platform independent way and then evaluated on various state-of-theart processors. Our experiments suggest that k-ary search pr...

• Type: Conference
• Year: 2009
• Where: DAMON
• Authors: Benjamin Schlegel, Rainer Gemulla, Wolfgang Lehner
• Keywords: Binary Search, DAMON 2009, Information Technology, K-ary Search, Search Algorithms