The Message-Minimizing Load Redistribution Problem

The Message Minimizing Load Redistribution Problem is described which arises from the need to redistribute work when performing load balancing in a parallel computing environment. We consider a global perspective and seek a redistribution plan that minimizes the overall processing time. We de ne the cost associated with a solution to be the number of packets needed to balance out the workload. The impact of the interconnection network is ignored. This problem can arise in many applications. One such example being the U.K. Meteorological OÆce's operational weather forecasting and climate prediction models. This problem is equivalent to the Pure Unit-Cost Transportation Problem. A simple proof of NP-completeness is given, and various heuristics and approximation issues are investigated. Several theoretical results are shown that may impact the design of an algorithm. Simulation results are presented.