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Enable GPU execution of MPAS-Atmosphere of pre-acoustic step setup calculations #1222

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Enable GPU execution of MPAS-Atmosphere of pre-acoustic step setup calculations #1222

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Commits on Aug 5, 2024

  1. Prepare atm_set_smlstep_pert_variables_work for OpenACC porting 

    Ensures that lines of code within a loop or conditional are apparent to
the reader. This change only affects whitespace to indent code within an
if-condition.
    @gdicker1
    gdicker1 committed Aug 5, 2024
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  2. Copy invariant fields used in atm_set_smlstep_pert_variables_work wit… 

    …h OpenACC

Ensure that the invariant fields that are used in this work routine are
present on the device from model startup to model shutdown.

Fields are added to the device with copyin directives and other code
within mpas_atm_dynamics_init and fields are deleted from the device
with matching delete directives and code in mpas_atm_dynamics_finalize.
    @gdicker1
    gdicker1 committed Aug 5, 2024
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  3. Add parallel and loop directives to atm_set_smlstep_pert_variables_work 

    Add directives for an initial port of this routine using OpenACC.
    @gdicker1
    gdicker1 committed Aug 5, 2024
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  4. Add acc data management to atm_set_smlstep_pert_variables_work 

    Ensure that other, non-invariant, fields are available on the device
during this routine and that modified variables are copied out at the
end.

Timing for these transfers are reported in the output log file in the
new timer: `atm_recover_smlstep_pert_variables [ACC_data_xfer]`.

The 'default(present)' clause is added to the parallel directive so that
any missing data causes a runtime error.
    @gdicker1
    gdicker1 committed Aug 5, 2024
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