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An example forecast experiment has been prepared for OpenIFS 48r1. The experiment ID is  ab2a. 

You should first download the tarball for this example experiment from here: https://sites.ecmwf.int/openifs/openifs-data/case_studies/48r1/karl/ab2a.tar.gz

Extract the example forecast experiment ab2a.tar.gz into a folder in a location suitable for model experiments. The global OpenIFS configuration file (oifs-config.edit_me.sh) sets the variable OIFS_EXPT which should point to the root directory for your OpenIFS experiments. You should extract ab2a.tar.gz to this location, and this folder will become your experiment directory. 

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On the ECMWF hpc2020 our model has been previously installed to $OIFS_HOME which is in $HOME/openifs-48r1.1. For the experiment we extract the ab2a package to to $OIFS_EXPT which is in a different location on the file system. The experiment directory shall therefore be $OIFS_EXPT/ab2a/2016092500. 

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cd $OIFS_EXPT
wget https://sites.ecmwf.int/openifs/openifs-data/case_studies/48r1/karl/# download the experiment tarball and extract to the experiment folder:
cp ab2a.tar.gz $OIFS_EXPT
tar -xvzf ab2a.tar.gz

Ensure the namelist files for the atmospheric model (fort.4) and for the wave model (wam_namelist) are found in the experiment directory.  If they are not already there then you can find them in a subfolder (called ecmwf) inside the experiment directory.

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#--- required variables for this experiment:

OIFS_EXPID="ab2a"       # your experiment ID
OIFS_RES="255"          # the spectral grid resolution (here: T255)
OIFS_GRIDTYPE="l"       # the grid type, either 'l' for linear reduced grid, or 'o' for the cubic octahedral grid
OIFS_NPROC=8            # the number of MPI tasks
OIFS_NTHREAD=4          # the number of OpenMP threads
OIFS_PPROC=true         # enable postprocessing of model output after the model run
OUTPUT_ROOT=$(pwd)      # folder where pproc output is created (only used if OIFS_PPROC=true). In this case an output folder is created in the experiment directory.
LFORCE=true             # overwrite existing symbolic links in the experiment directory
LAUNCH=""               # the platform specific run command for the MPI environment (e.g. "mpirun", "srun", etc).

#--- optional variables that can be set for this experiment:

#OIFS_NAMELIST='my-fort.4'               # custom atmospheric model namelist file
#OIFS_EXEC="<cutome<custom-path>/ifsMASTER.DP"  # model exec to be used for this experiment

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• • It is important to change "/path/to/your/config/oifs-config.edit_me.sh" to the actual path for the oifs-config.edit_me.sh, e.g., "$HOME/openifs-48r1.1/oifs-config.edit_me.sh"
  • The default resources requested in run.ecmwf-hpc2020.job are  8 nodes on the ECMWF hpc2020 machine, with a total of 256 MPI tasks and 4 OpenMP threads. This can be changed as required.
  • For information, the LAUNCH command for batch job submission is set to "srun" without any further options, because all required parallel environment settings are provided through the SLURM script headers.

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Step 1:  Copy the Metview processing code to your $OIFS_EXPT location:

(either via download in a web browser or via using the wget utility)

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Again, download the Metview data package from this site: https://sites.ecmwf.int/openifs/openifs-data/case_studies/48r1/karl/mv.tar.gz

# download the Metview data package and extract in the experiment directory:
cp mv.tar.gz $OIFS_EXPT
tar -xvzf mv.tar.gz
cd mv

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