Using OpenACC to port large legacy climate and weather modeling code to GPUs
Xavier Lapillonne*; Katherine Osterried † ; Oliver Fuhrer* * Federal Office of Meteorology and Climatology MeteoSwiss, Zurich, Switzerland † Center for Climate Systems Modeling (C2SM), ETH Zurich, Zurich, Switzerland
Abstract
The purpose of this chapter is to describe a step-by-step porting approach for weather and climate model Fortran code to run on GPUs using CUDA and OpenACC.
At the end of this chapter, the reader will have a basic understanding of:
• How to use OpenACC to port components of a production weather and climate model achieving a gain of about a factor of 2.3 × in terms of time to solution and about a factor of 3 × in terms ...
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