Enable executing atm_zero_gradient_w_bdy_work on GPUs. #1272
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…rk on GPUs. Note this commit adds "atm_zero_gradient_w_bdy_work [ACC_data_xfer]" timers to time the data transfers done in atm_zero_gradient_w_bdy_work, but there is no timer for the actual computation done in atm_zero_gradient_w_bdy_work.
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This PR enables executing the atm_zero_gradient_w_bdy_work subroutine on GPUs.
This is accomplished using OpenACC directives.
Tested with a regional test case.
Baseline results were obtained from building the develop branch with:
make -j4 nvhpc CORE=atmosphere PRECISION=single OPENACC=true
Then the changes in this PR were made and compiled in the same way.
Comparing the results stored in the restart.*.nc file showed no changes.
Note this commit adds "atm_zero_gradient_w_bdy_work [ACC_data_xfer]" timers to time the data transfers done in atm_zero_gradient_w_bdy_work, but there is no timer for the actual computation done in atm_zero_gradient_w_bdy_work.