Grid enabled MPI solutions for clusters

Distributing an application onto several machines is one of the key aspects of Grid-computing. In the last few years several groups have developed solutions for the occurring communication problems. However, the focus on the machines used in distributed environments has changed over the time from Massively Parallel Processing Systems to Clusters. This paper presents the problems arising when coupling several cluster like systems and discusses possible solutions. Furthermore, we present performance results and performance drawbacks of the solutions discussed before.