Support for choosing the precision mode of MPAS dycore via CIME #347
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kuanchihwang
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Feb 20, 2025
### Tag name (required for release branches): None ### Originator(s): kuanchihwang ### Descriptions (include the issue title, and the keyword ['closes', 'fixes', 'resolves'] followed by the issue number): This PR refactors the build system of MPAS dycore. Build performance has been improved. PIO version selection is now more robust. The availability of optional MPAS features is now determined by querying relevant configuration options from CIME rather than being hard-coded. MPAS dycore is in double precision mode by default. Users can choose to enable single precision mode by running: ```bash ./xmlchange --append CAM_CONFIG_OPTS="--dyn-kind REAL32" ``` Closes #347. ### Describe any changes made to the build system: See above. ### Describe any changes made to the namelist: None ### List any changes to the defaults for the input datasets (e.g., boundary datasets): None ### List all files eliminated and why: None ### List all files added and what they do: None ### List all existing files that have been modified, and describe the changes: * `M cime_config/buildlib` * Support for enabling optional MPAS features through CIME * Remove trailing spaces * `M src/dynamics/mpas/assets/Makefile.in.CESM` * Avoid using recursively expanded variables * Make PIO version selection more robust * Support for enabling optional MPAS features through CIME ### Regression tests: No changes to any existing tests with respect to the last baseline, `sima0_03_000`. * SMS_Ln9.ne5pg3_ne5pg3_mg37.FCAM7.derecho_gnu.cam-outfrq_se_cslam_analy_ic (Overall: FAIL) * SMS_Ln9.ne5pg3_ne5pg3_mg37.FCAM7.derecho_intel.cam-outfrq_se_cslam_analy_ic (Overall: FAIL) * Existing test failures
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What is the feature/what would you like to discuss?
Since CAM-SIMA PR #327, the capability of running MPAS dycore in single precision mode has been introduced. However, to enable it, users have to manually uncomment the line
# export CPPFLAGS += -DSINGLE_PRECISIONin the Makefile atsrc/dynamics/mpas/assets/Makefile.in.CESM.The
ConfigCAMPython class can already parse thedyn_kindargument, which can be specified via theCAM_CONFIG_OPTSvariable. Therefore, for better usability, we should allow users to choose the Fortranrealkind in MPAS dycore by the usual CIME method:Is there anyone in particular you want to be part of this conversation?
No response
Will this change (regression test) answers?
No
Will you be implementing this enhancement yourself?
Yes
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