Remove GPU options from the Python workflow and move them to XML files for CESM

[sjsprecious]

As discussed in #4687, it is better remove the GPU options from the Python workflow in CIME and use XML files instead to configure them for CESM.

This PR does this and it works for CESM CPU & GPU runs according to my tests on Derecho.

The general build procedure for building a CESM GPU run on Derecho now looks like (the other machines can modify the settings for their specific hardware accordingly):

1. create a new case as normal
2. go to the case directory
3. ./xmlchange GPU_TYPE=a100
4. ./xmlchange OPENACC_GPU_OFFLOAD=TRUE
5. ./xmlchange OVERSUBSCRIBE_GPU=TRUE
6. ./xmlchange NGPUS_PER_NODE=4
7. ./case.setup
8. ./case.build

It should work together with the following PRs:

• CMEPS: Update XML variables for GPU configurations ESCOMP/CMEPS#512
• ccs_config_cesm: Update Derecho setups for new GPU XML variables ccs_config_cesm#189

[jedwards4b]

pylint errors to correct:

************* Module CIME.XML.env_mach_pes
CIME/XML/env_mach_pes.py:47:8: W0613: Unused argument 'oversubscribe_gpu' (unused-argument)
************* Module CIME.case.case_setup
CIME/case/case_setup.py:415:24: W1309: Using an f-string that does not have any interpolated variables (f-string-without-interpolation)
CIME/case/case_setup.py:427:20: W1309: Using an f-string that does not have any interpolated variables (f-string-without-interpolation)

[sjsprecious]

Thanks @jedwards4b . I have fixed the pylint error. But it looks like there are still two errors left:

Trim Trailing Whitespace.................................................Failed
- hook id: trailing-whitespace
- exit code: 1
- files were modified by this hook

black....................................................................Failed
- hook id: black
- files were modified by this hook

reformatted CIME/case/case_setup.py

Could you tell me how to fix these errors?

[jedwards4b]

The easiest way is to install pre-commit and use it locally.
You can install it from pip, or use mine: /glade/u/home/jedwards/.local/bin/pre-commit
from your cime directory: pre-commit run
This should reformat case_setup.py then you can commit again.

[sjsprecious]

Thanks @jedwards4b . I ran the pre-commit run from my cime directory and here is what I saw:

[INFO] Initializing environment for https://github.com/pre-commit/pre-commit-hooks.
[INFO] Installing environment for https://github.com/pre-commit/pre-commit-hooks.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
check xml............................................(no files to check)Skipped
fix end of files.........................................................Passed
trim trailing whitespace.................................................Passed
debug statements (python)............................(no files to check)Skipped
black................................................(no files to check)Skipped
pylint...............................................(no files to check)Skipped

It seems that nothing is fixed somehow. I am using pre-commit 4.0.0. Should I try another specific version instead?

[jasonb5]

@sjsprecious Run pre-commit run -a, this should check all the files and fix any issues.

[sjsprecious]

Thanks @jasonb5 . I have fixed them with Jim's help.