CICE5 build for ESM1.6 (and CM2?)

[anton-seaice]

For ESM1.6, we are moving to CICE5 (instead of CICE4 used in EMS1.5.

The starting point for this is this branch which is the basis for getting the OASIS coupling to the UM.

I've managed to build this branch, using this hacked together spack package file:

https://github.com/ACCESS-NRI/spack-packages/compare/cice5_esm1p6

The changes are:

• remove parallelio dependency
• change driver & block size
• change NICELYR pre-processor flag

Well need to integrate these changes into the CICE5 spack package.

[anton-seaice]

Also - possibly we don't need the libaccessom2 dependency for ESM1.6 either ?

[anton-seaice]

This is the build script from CM2: https://github.com/ACCESS-NRI/access-cm2-drivers/blob/main/src/CICE_compile.csh

and deps:

module use ~access/modules
module load intel-compiler/2020.3.304
module load openmpi/4.0.2
module load oasis3-mct-local/ompi.4.0.2
module load netcdf/4.6.3

[harshula]

Hi, Use the techniques used for ESM1.5 in https://github.com/ACCESS-NRI/spack-packages/blob/main/packages/mom5/package.py

[anton-seaice]

@MartinDix

Do you know what this variable does?:

setenv CHAN MPI1 # MPI1 or MPI2 (always MPI1!)

from https://github.com/ACCESS-NRI/access-cm2-drivers/blob/605d838e37ab0e452e4e72326ae7a384f9398576/src/CICE_compile.csh#L30C1-L30C53

[aidanheerdegen]

@MartinDix

Do you know what this variable does?:

setenv CHAN MPI1 # MPI1 or MPI2 (always MPI1!)

from https://github.com/ACCESS-NRI/access-cm2-drivers/blob/605d838e37ab0e452e4e72326ae7a384f9398576/src/CICE_compile.csh#L30C1-L30C53

Supposition: It's an MPI channel id to allow multiple MPI communicators. I know nothing else.

@ezhilsabareesh8 knows a lot more than I do about MPI comms, he may be able to comment about communicators in a more general sense.