Enable GPU exection of atm_advance_acoustic_step via OpenACC #1251
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These changes are mostly cosmetic and to remove unnecessary characters. In one case, these modifcations make the specZoneMaskCell if condition more apparent. The improved readability will help the porting steps that follow.
This includes grouping together some variable assignments to reduce if conditions, making array assignments explicit to ensure the operations are parallelizable, and fusing some loops that have the same bounds to reduce iterations.
Use OpenACC parallel and loop directives so this work routine can be executed on a GPU. More changes will be needed to improve performance.
Ensures the fields which don't change while the model is running are present on the device from model startup until model shutdown. It builds on the changes in PR MPAS-Dev#1176 to copyin invariant fields during mpas_atm_dynamics_init and delete them from the device during mpas_atm_dynamics_finalize.
Ensure that the other, non-invariant fields are available for this routine. Variables that are overwritten during this routine are only created while others are copied in. Any variables overwritten by this routine are copied out at the end. Timing for these transfers are reported in the output log file in the new timer: 'atm_advance_acoustic_step [ACC_data_xfer]'.
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NOTE: This PR is paused. I am sorting out the merge conflicts and a run-time error. I will notify again when this PR is ready for review. |
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This PR makes small code modifications and adds OpenACC directives so the
atm_advance_acoustic_step_workroutine can execute on GPU(s).Timing information for the OpenACC data transfers in this routine is captured in the log file by a new timer:
atm_advance_acoustic_step [ACC_data_xfer].Invariant fields used in this routine are also copied to the device within
mpas_atm_dynamics_initand are deleted inmpas_atm_dynamics_finalize.