DyRecT: Software Support for Adaptive Parallelism on NOWs

Abstract. In this paper, we describe DyRecT (Dynamic Reconfiguration Toolkit) a software library that allows programmers to develop adaptively parallel message-passing MPI programs for clusters of workstations. DyRecT provides a high-level API that can be used for writing adaptive parallel HPF-like programs while hiding most of the details of the dynamic reconfiguration from the programmer. In addition, DyRecT provides support for making a wider variety of applications adaptive by exposing to the programmer a low-level library that implements many of the typical tasks performed during reconfiguration. We present experimental results for the overhead of dynamic reconfiguration of several benchmark applications using DyRecT.