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Configure_app

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fernanqv edited this page Mar 17, 2022 · 1 revision

app configuration in experiment.wrf4g

To use WRF through WRF4G, you need to configure the app variable in the Experiment file. By default, WRF4G provides a bundle with all you need to simulate a WRF experiment, which is configured as follows :

app = wrf_all_in_one | bundle | /home/user/wrf4g/repository/apps/WRF/WRFbin-3.4.1_r2265_gfortran.tar.gz

This bundle can be used on x86_64 Linux systems, and contains binaries, libraries and configuration files for WRF-3.4.1 build against gfortran-4.4.7, openmpi-1.4.3 and netcdf-4.1.3, which are included in the bundle too (hence, all in one).

This configuration is quite useful, because you do not need to install WRF on every computing resource.

However, if you'd like to use your own WRF, installed on your machine or on a cluster, you can do so by updating the app variable. There are several ways to configure this variable depending on your WRF configuration. Let's see some examples:

  • Using module command:
app = wps | command | module load wps/4.5.1
     wrf | command | module load wrf/4.5.1

We assume that each command is configuring other pieces of software, such as openmpi, netcdf and so on.

  • Using PATH and LD_LIBRARY_PATH environment variables:
app = netcdf_bin | command | PATH=/home/user/netcdf-4.1.3/bin/:$PATH
     netcdf_lib | command | LD_LIBRARY_PATH=/home/user/netcdf-4.1.3/lib/:$LD_LIBRARY_PATH
     wrf_bin    | command | PATH=/home/user/WRF4.5.1/:$PATH
  • If WRF is already configured and readily accessible (i.e. in the search path) on your system, you do not need to use the app variable.

As you might have probably noticed, we didn't mention heavy input files required by some WRF configurations (e.g. CAM_ABS_DATA, CAM_AEROPT_DATA, co2_trans, etc). In order to make these available for a specific WRF experiment, it is highly recommended to create a directory tree under the WRF4G_files directory for that experiment.

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