Tutorials

Running and changing the "benchmark" test

As outlined in Running a model obtain an interactive shell on batch nodes:

msub -I -lsize=32,walltime=01:00:00

To run the benchmark test, cd to the benchmark directory and launch the executable:

cd ocean_only/benchmark/
mkdir -p RESTART
aprun -n 8 ../../build/intel/ocean_only/repro/MOM6

Altering the benchmark test

The benchmark test case is an example of a regional ocean model with two (hypothetical) ocean basins connected via a channel. The idealized shape of the basins (i.e., ocean mask), topography and grids are generated at run-time so there is no need for input grid files. The initial conditions are also set at runtime.

The grid resolution is set at NIGLOBAL x NJGLOBAL = 360x180 (1/4 degree for the region in this test case). If desired, this can be changed via an input file (MOM_override) in the working directory. For example, to make the model 4 times bigger one could do this in the workdir:

cd ocean_only/benchmark/
cat << EOF > MOM_override 
#override NIGLOBAL = 720
#override NJGLOBAL = 360
EOF

The default total run time of this test is 2 days. This can be changed by adding the following lines to input.nml in the working directory:

cd ocean_only/benchmark/
cat << EOF >> input.nml
 &ocean_solo_nml
        months = 0
        days = 20 /
EOF