WOMBAT: A Scalable and High-performance Astrophysical Magnetohydrodynamics Code
P. J. Mendygral, N. Radcliffe, K. Kandalla, D. Porter, B. J. O’Neill, Chris Nolting, P. Edmon, J. M. F. Donnert, T. W. Jones · The Astrophysical Journal Supplement Series · 2017
Abstract We present a new code for astrophysical magnetohydrodynamics specifically designed and optimized for high performance and scaling on modern and future supercomputers. We describe a novel hybrid OpenMP/MPI programming model that emerged from a collaboration between Cray, Inc. and the University of Minnesota. This design utilizes MPI-RMA optimized for thread scaling, which allows the code to run extremely efficiently at very high thread counts ideal for the latest generation of multi-core and many-core architectures. Such performance characteristics are needed in the era of “exascale” computing. We describe and demonstrate our high-performance design in detail with the intent that it may be used as a model for other, future astrophysical codes intended for applications demanding exceptional performance.