A Load Balancing Package for Domain Decomposition on Distributed Memory Systems

. We present a tool for balanced decomposition of spatial domains. In addition to applying a nested bisection algorithm to determine the boundaries of each subdomain, the tool replicates a user specified zone along the boundaries of the subdomain in order to minimize future interactions between subdomains. Results of running the tool on the Cray T3D system, as well as using it in the implementation of a parallel Particle-particle/Particle-Mesh code are reported and discussed. 1 Introduction A wide range of scientific applications suffer from load imbalances and excessive interprocessor communications when they are ported for execution on massively parallel processing systems. In this paper, we will introduce a dynamic load balancing package, Bisect, which we developed on the CRAY T3D system and which has been ported to the IBM SP-2 and to workstation clusters using MPI primitives. The package uses the nested bisection method to achieve dynamic load balancing for applications in which ..