Local testing help / defaults

[kafitzgerald]

I was able to get testing working on Cheyenne using the nwm_compute environment and the scripts in tests/local 🎉, but some of the help looks like it should be updated (incl. the README - which seems pretty dated at this point) and I'm a bit confused about some of the default options.

In particular...

Compiler options should be ifort and gfort rather than:

wrf_hydro_nwm_public/tests/local/run_tests.py

Line 118 in d24469a

help='<Required> compiler, options are intel or gfort')

The choices keyword argument for add_argument looks like it might be helpful for this and some of the other options in here particularly if we're trying to get more people on board with this.

Also, a bit confused about the ncores and nnodes option defaults and how they can be overwritten here:

wrf_hydro_nwm_public/tests/local/run_tests.py

Lines 52 to 59 in d24469a

	if scheduler:
	# reset ncores and nnodes defaults to scheduler defaults
	if ncores == 2:
	ncores = 216
	if nnodes < 6:
	warnings.warn('CONUS testing should run on a minimum of 6 nodes, setting nnodes '
	'to 6')
	nnodes = 6

Is this so we can support testing (appropriate default values) on both local machines and HPC systems? Seems like we might want less than 6 nodes on Cheyenne in some cases.

Really excited about this working though!!