Build/run without MPI

[zmoon]

Currently you can't build NEXUS without MPI:

NEXUS/src/CMakeLists.txt

Line 15 in 3842818

find_package(MPI REQUIRED)

However, HEMCO doesn't require MPI, so in principle it should be fine to build/run without MPI.

From my experiments, currently you can run with non-MPI ("mpiuni") ESMF, though NEXUS fails in debug mode since ESMF_FieldWrite doesn't work with mpiuni ESMF.

NEXUS/src/nexus_methods_mod.F90

Line 3601 in 3842818

call ESMF_FieldWrite( field, fileName, overwrite=.true., &

☝️ part of the StateWrite routine called here:

NEXUS/src/nexus_methods_mod.F90

Lines 534 to 535 in 3842818

	if (do_Debug) then
	call StateWrite( NXS_Diag_State, DiagFile, timeSlice=CNT, rc=localrc )