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It has been a part of the National Science Foundation and Department of Energy community climate models (Community Climate System Model (CCSM) and Community Earth System Model (CESM)) for over a decade. It includes various physical and dynamical processes and is parallelized to run on large-scale computer systems. The CICE model was assessed in the CESM at different resolutions and target processor counts to better understand and optimize the performance. Several new decompositions and a new feature to reduce the halo cost were added to the model. The new decompositions better leverage land block elimination and take advantage of scaling opportunities in different computational kernels. As a result of these new features, the CICE model performance has been improved by up to 45% and has more flexibility to be run efficiently at arbitrary Message Passing Interface (MPI) task counts.<\/jats:p>","DOI":"10.1177\/1094342014548771","type":"journal-article","created":{"date-parts":[[2014,9,5]],"date-time":"2014-09-05T01:27:06Z","timestamp":1409880426000},"page":"154-165","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":9,"title":["Improved parallel performance of the CICE model in CESM1"],"prefix":"10.1177","volume":"29","author":[{"given":"Anthony P","family":"Craig","sequence":"first","affiliation":[{"name":"Climate and Global Dynamics Division, National Center for Atmospheric Research, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sheri A","family":"Mickelson","sequence":"additional","affiliation":[{"name":"Mathematics and Computer Science Division, Argonne National Laboratory, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth C","family":"Hunke","sequence":"additional","affiliation":[{"name":"Fluid Dynamics and Solid Mechanics Group, Theoretical Division, Los Alamos National Laboratory, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David A","family":"Bailey","sequence":"additional","affiliation":[{"name":"Climate and Global Dynamics Division, National Center for Atmospheric Research, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2014,9,3]]},"reference":[{"key":"bibr1-1094342014548771","volume-title":"Proceedings for 11th International Meeting on High-Performance Computing for Computational Science (VECPAR 2014)","author":"Balaprakash P","year":"2013"},{"key":"bibr2-1094342014548771","doi-asserted-by":"publisher","DOI":"10.1029\/1999JC900100"},{"key":"bibr3-1094342014548771","unstructured":"Briegleb BP, Light B (2007) A delta-Eddington multiple scattering parameterization for solar radiation in the sea ice component of the Community Climate System Model. 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