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Info

Worked Example:

We explain the model installation and the process of running of a forecast experiment on the ECMWF HPC facility (hpc2020). 

  • All data files and configuration scripts that are required for the worked example experiment described in this guide can be found on the ECMWF file system here:  /perm/openifs/oifs_data/48r1/example
  • The model will be installed into $HOME/openifs_-48r1.0/
  • The example forecast experiment will be set up in directory $PERM/i4xc/

It is important to note that the installation process on hpc2020 will not directly translate to alternative systems

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Code Block
languagebash
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export OIFS_HOME=$HOME/openifs_-48r1.0/

The other model environment variables are

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Example: 
On the ECMWF hpc2020 our model installation $OIFS_HOME will be in $HOME/openifs_-48r1.0 and for the experiment we extract the i4xc package to $PERM. The experiment directory shall therefore be $PERM/i4xc/2016092500. 

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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_-48r1.0/scripts/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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