= prolog.wrf4g file =

'''prolog.wrf4g''' configuration file allows specify tools to be used locally on the remote computing resources. This file has to be in the directory in which '''[wiki:WRF4Gexperiment_wrf4g experiment.wrf4g] is located'''. In order to help you, we show two possible examples bellow:

* In this first example, we want to use your own WRF, WPS and NetCDF library compilation available on your remote computing resources. If we assume that all the jobs from an experiment has access to a local versions. WRF4G will use there binaries ('''ungrib.exe''' ,'''metgrid.exe''', '''real.exe''', '''wrf.exe''' and '''ncdump''') in order to simulate the experiments. 
{{{
#!sh
[user@mycomputer~]$ cat prolog.wrf4g
export PATH=~/WPS:$PATH
export PATH=~/WRFV3/run:$PATH
export PATH=~/netCDF/bin:$PATH
}}}

* This second example presents a bash shell code which basically distinguishes between two resources using `$GW_HOSTNAME` variable. In this example, on mycomputer, you will use mpich2 with ethernet connection and on mycomputer2, you will use mvapich2 with infiniband connection.
{{{
#!sh
[user@mycomputer~]$ cat prolog.wrf4g
if [ $GW_HOSTNAME = mycomputer ]; then
    use WRFV3.3.1
    use netCDF4.1.3
    use mpich2
fi

if [ $GW_HOSTNAME = mycomputer2 ]; then
    use WRFV3.3.1
    use netCDF4.1.3
    use mvapich2
fi
}}}

How to know the value of all `$GW_HOSTNAME` variable?
{{{
#!sh
[user@mycomputer~]$ wrf4g_resources | awk {'print $11'}
HOSTNAME
mycomputer
mycomputer2
}}}