1. Compiling WPS on expanse¶
1.1. Obtaining and compiling WPS on expanse¶
1.1.1. Download WPS from github¶
You should download your WPS code to a directory “next to” your WRF directory. The WPS code will look for code
git clone https://github.com/wrf-model/WPS.git
This will download the code into a subdirectory called WPS in the current directory. Enter this directory:
cd WPS
Caution
Note that the steps below must be done in one ssh session. Library paths on expanse change from session to session, so you must start from here if you lose your connection.
1.1.2. Configuring WPS¶
We will now configure WPS for compilation. First, we need to set up the software environment for WRF. expanse uses the modules package to configure software. Here is the software environment we need for WRF:
module purge
module load cpu intel mvapich2
module load netcdf-c netcdf-cxx netcdf-fortran
module load libpng jasper zlib
Next we need to find the NETCDF library path, and set an environment variable for it. Run the following command:
echo $LD_LIBRARY_PATH | grep netcdf
Grab the path that looks like this, containing netcdf-fortran:
/cm/shared/apps/spack/cpu/opt/spack/linux-centos8-zen2/intel-19.1.1.217/netcdf-fortran-4.5.3-2wjlrztnogahr6sgpaxuwwd2mfl5ligr/
and set the environment variable NETCDF to that path:
export NETCDF=/cm/shared/apps/spack/cpu/opt/spack/linux-centos8-zen2/intel-19.1.1.217/netcdf-fortran-4.5.3-2wjlrztnogahr6sgpaxuwwd2mfl5ligr/
Also, for performance increase over data output size, set the following:
export NETCDF_classic=1
Finally, we must point WPS to the jasper libraries and include files:
export JASPERLIB=/usr/lib64
export JASPERINC=/usr/include
Now run configure:
./configure
Select option 19, and it should complete.
1.1.3. Compiling WPS¶
Now, you can compile WPS.
./compile
This should take less than 5 minutes. At the end, you should have geogrid.exe, ungrib.exe, and metgrid.exe.
Note
In case something goes wrong, as in the WRF compile, in the top level WPS directory, run ./clean -a to remove all compiled files, and configure and compile again.