Processor allocation research involves the design of processor scheduling and allocation algorithms for message-passing machines based on the mesh and k-ary n-cube network topologies. Processor allocation involves selection of a subset of processors for assignment to each incoming job request with the goal of maximizing system throughput. We have developed a simulation and visualization tool called ProcSimity to support experimentation and performance analysis with a wide range of allocation algorithms on a spectrum of machine architectures. In collaboration with Bill Nitzberg at NASA Ames NAS, we are also involved in empirical experimentation with state of the art machines.