Performance Evaluation of RDMA Communication Patterns by Means of Simulations

Communication patterns that appear in RDMA-based parallel programming are different from those in the standard MPI programming. In this paper, we evaluated the performance of typical communication patterns in RDMA-based applications using simulations. The simulations predicted execution times with errors less than 10%. The simulation accuracy was sufficient to detect a performance change between two different synchronization points in an application. We also showed that these simulations were useful for analyzing the cause of a performance degradation in the communication pattern.