e. (optional) WRF Manual Install

In a. Spack Install WRF we installed WRF using a package manager, Spack. In this section we’re going to compile it by hand, still building dependencies with WRF. You might need to do this if you:

  1. Need to use a version not currently supported by Spack
  2. Want to use a modified version of WRF.

In most other cases, the Spack approach will be better. We’re going to create a Spack environment for our dependencies, think of this similar to a python virtual environment, it defines the packages and specific variants we need and installs them into their own environment, which can be loaded via spack env activate command. All of these steps will be done on a compute node, so our build matches the architecture that we will be running on.

  1. Get an interactive session on a compute node, this may take 2 to 3 minutes if all the nodes are powered down.
srun -N 1 --exclusive --pty /bin/bash -il
  1. Create the following spack environment file, specifying all the dependencies of WRF:
cat << EOF > wrf_build.yaml
# This is a Spack Environment file.
# It describes a set of packages to be installed, along with
# configuration settings.
  concretization: together
      compiler: [intel]
        mpi: [intel-oneapi-mpi+external-libfabric%intel]
  - intel-oneapi-compilers
  - intel-oneapi-mpi+external-libfabric%intel
  - jasper%intel
  - netcdf-c%intel
  - netcdf-fortran%intel
  - parallel-netcdf%intel
  view: true
  1. Next create the environment and install the packages, this will take ~ 25 mins.
spack env create wrf_build wrf_build.yaml
spack env activate wrf_build
spack install -j 16
  1. Finally we’re going to compile WRF using the dependencies we just installed:
# load the Intel compilers and MPI package
spack load intel-oneapi-compilers
spack load intel-oneapi-mpi
# set dependency paths from spack environment
export HDF5=$SPACK_ENV/.spack-env/view/
export JASPERINC=$SPACK_ENV/.spack-env/view/include
export JASPERLIB=$SPACK_ENV/.spack-env/view/lib
export NETCDF=$SPACK_ENV/.spack-env/view/
export PNETCDF=$SPACK_ENV/.spack-env/view/
# download source from Github
wget https://github.com/wrf-model/WRF/archive/refs/tags/v4.3.3.tar.gz
tar -xzf v4.3.3.tar.gz
# configure
cd WRF-4.3.3

When prompted select Enter selection [1-75] : 67:

Enter selection [1-75] : 67
Compile for nesting? (1=basic, 2=preset moves, 3=vortex following) [default 1]: 1

Now compile:

./compile -j 4 em_real 2>&1 | tee compile.log
  1. Once WRF has been built, we no longer need the compute node.