GPU-enabled Efficient Executions of Radiation Calculations in Climate Modelling

Sai Kiran Korwar
Supercomputer Education and Research Centre, Indian Institute of Science, Bangalore
Indian Institute of Science, 2013


   title={GPU-enabled Efficient Executions of Radiation Calculations in Climate Modelling},

   author={Korwar, Sai Kiran and Education, Supercomputer},



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In this paper, we discuss the acceleration of a climate model known as Community Earth System Model (CESM). The use of Graphics Processor Units (GPUs) to accelerate scientific applications that are computationally intensive is well known. This project attempts to extract the performance of GPUs to enable fast execution of CESM to obtain better model throughput. We focus on two major routines that consume the largest amount of time namely, radabs and radcswmx, which compute the long wave and short wave radiations respectively. By exploiting the parallelism offered by the GPU and using asynchronous executions on the CPU and GPU we obtain a speed-up of about 26x for the routine radabs and about 5.6x for routine radcswmx.
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