Abstract
Parallel performance of a flow solver, S3D, for direct numerical simulation of turbulent combustion is evaluated on the latest Cray XT system installed at the National Center for Computational Sciences (NCCS). S3D is a massively parallel code that uses MPI for message passing parallelism. It has been ported to various platforms at the Office of Science computational facilities and scales very well to a large fraction of the system. In the past, S3D showed near perfect parallel scaling in the performance studies conducted on the Cray XT3 system. However, S3D was found to exhibit higher parallel communication overheads on the Cray XT system at NCCS following a recent upgrade. This article presents the results of the scaling study and an analysis of the parallel
and dual-core performance.
