MPI Development Tools and Applications for the Grid

The message passing interface (MPI) is a standard used by many scientific applications. It has the advantage of a smoother migration path for porting applications to the Grid. In this paper Grid-enabled tools and libraries for developing MPI applications are presented. The first is PACX-MPI, an implementation of the MPI standard optimized for Grid environments. The second is MARMOT, a tool that checks the adherence of an application to the MPI standard. Besides the efficient development of the program, an optimal execution is of paramount importance for most scientific applications. We therefore discuss not only performance on the level of the MPI library, but also several application specific optimizations, e. g. for a TFQRM solver and an RNA folding code, like latency hiding, prefetching, caching and topology-aware algorithms.