Enable GPU exection of atm_bdy_adjust_scalars_work via OpenACC #1266
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Small whitespace changes. Also change implicit loop to an explicit loop to better parallelize. Implicit loops can be ported with 'acc kernels', but we prefer more proscribed 'acc parallel ...' constructs.
jim-p-w
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Jan 23, 2025
abishekg7
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Feb 1, 2025
abishekg7
reviewed
Feb 1, 2025
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Other than my comments, this PR seems to be bit identical with the previous version of develop. |
This commit adds an initial port of this routine using OpenACC. More changes are needed for performance and data management.
Ensures the fields which don't change while the model is running are present on the device from model startup to model shutdown.
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_bdy_adjust_scalars [ACC_data_xfer]'. Also add default(present) to parallel directives to ensure data movement is correct and prevent any implicit data movements from the compiler.
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This PR makes small code modifications and adds OpenACC directives so the atm_bdy_adjust_scalars_work routine 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_bdy_adjust_scalars [ACC_data_xfer].
Invariant fields used in this routine are also copied to the device within mpas_atm_dynamics_init and are deleted in mpas_atm_dynamics_finalize.