Optimize ACC port of atm_advance_acoustic_step_work:3964#1477
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abishekg7 wants to merge 2 commits into
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Optimize ACC port of atm_advance_acoustic_step_work:3964#1477abishekg7 wants to merge 2 commits into
abishekg7 wants to merge 2 commits into
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This PR introduces optimizations for the OpenACC port of atm_advance_acoustic_step_work:3964. The table below lists the timings for a real, global 30km experiment on A100 GPU with the nvhpc.
For nvhpc gpu runs, -gpu=math_uniform is introduced as a build flag to ensure optimizations are bit-identical, and the we report the numbers using NV_ACC_TIME=1. The GPU runs are on 1 Derecho GPU node, using 1 A100 via 1 MPI task.
As the changes introduced aren't expected to affect CPU execution times, the CPU columns are skipped.
The substantial speedup achieved in this PR is a result of utilizing all the threads available to each warp.
This work was completed in part at the NCAR/NLR/NOAA Open Hackathon, part of the Open Hackathons program. The authors would like to acknowledge OpenACC-Standard.org for their support.