@inproceedings{c81e10b152424c99be85c0a4766e2ea8,
title = "Scalability of global 0.25° ocean simulations using MOM",
abstract = "We investigate the scalability of global 0.25° resolution ocean-sea ice simulations using the Modular Ocean Model (MOM). We focus on two major platforms, hosted at the National Computational Infrastructure (NCI) National Facility: an x86-based PRIMERGY cluster with InfiniBand interconnects, and a SPARC-based FX10 system using the Tofu interconnect. We show that such models produce efficient, scalable results on both platforms up to 960 CPUs. Speeds are notably faster on Raijin when either hyperthreading or fewer cores per node are used. We also show that the ocean submodel scales up to 1920 CPUs with negligible loss of efficiency, but the sea ice and coupler components quickly become inefficient and represent substantial bottlenecks in future scalability. Our results show that both platforms offer sufficient performance for future scientific research, and highlight to the challenges for future scalability and optimization.",
keywords = "High performance computing, Ocean modeling, Parallel computing, Performance profiling",
author = "Marshall Ward and Yuanyuan Zhang",
note = "Publisher Copyright: {\textcopyright} IFIP International Federation for Information Processing 2015.; 11th IFIP WG 5.11 International Symposium on Environmental Software Systems, ISESS 2015 ; Conference date: 25-03-2015 Through 27-03-2015",
year = "2015",
doi = "10.1007/978-3-319-15994-2_55",
language = "English",
series = "IFIP Advances in Information and Communication Technology",
publisher = "Springer New York LLC",
pages = "542--551",
editor = "Ralf Denzer and Argent, {Robert M.} and Gerald Schimak and Ji{\v r}{\'i} H{\v r}eb{\'i}{\v c}ek",
booktitle = "Environmental Software Systems",
}