A GPU Implementation of Parallel Constraint-based Local Search

Alejandro Arbelaez, Philippe Codognet
JFLI, University of Tokyo
Techniques foR Implementing Constraint programming Systems (TRICS), 2013


   title={A GPU Implementation of Parallel Constraint-based Local Search},

   author={Arbelaez, Alejandro and Codognet, Philippe},



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In this paper we study the performance of constraint-based local search solvers on a GPU. The massively parallel architecture of the GPU makes it possible to explore parallelism at two different levels inside the local search algorithm. First, by executing multiple copies of the algorithm in a multi-walk manner and, second, by evaluating large neighborhoods in parallel in a single-walk manner. Experiments on three well-known problem benchmarks indicate that the current GPU implementation is up to 17 times faster than a well-tuned sequential algorithm implemented on a desktop computer.
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