3.2. Required software

Building a JULES executable requires FCM and one of the supported Fortran compilers (see Building JULES using FCM). The Fortran 90 NetCDF interface library is required to use gridded data (i.e. data for more than a single location).

To be able to automatically upgrade namelists between JULES versions or use a GUI to configure JULES runs, Rose is required.

All of this software is freely available:

• GFortran, the GNU GCC Fortran compiler - http://www.gnu.org/software/gcc/fortran

• FCM - http://metomi.github.io/fcm/doc

• Rose - http://metomi.github.io/rose/doc/html/index.html

• NetCDF libraries - http://www.unidata.ucar.edu/software/netcdf

JULES has only been tested on Linux but, given a suitable Fortran compiler, should run on any Unix-like system with minimal changes. The recommended way to attempt to run JULES on Windows is via the Linux compatability layer Cygwin, although this is untested.

3.2.1. Building JULES with NetCDF

To build JULES with NetCDF, it must be told where to find the NetCDF library files. JULES needs two pieces of information - the directory containing the NetCDF archive files, netcdf.a and netcdff.a (the ‘NetCDF library path’), and the directory containing the NetCDF Fortran 90 module file, netcdf.mod (the ‘NetCDF include path’). In a standard NetCDF install, these are often /usr/lib and /usr/include or /usr/local/lib and /usr/local/include respectively.

If the nc-config program is installed on your system (run which nc-config to find out), this can be used to determine values for the NetCDF library path (nc-config --flibs) and NetCDF include path (nc-config --includedir). When JULES is built with NetCDF, users can supply either ASCII or NetCDF input files, and all output will be NetCDF.

3.2.2. Building and running JULES with MPI

Warning

For advanced users only

In order to build and run JULES with MPI, additional software is required:

1. An implementation of MPI compiled using the same compiler you will be using to compile JULES. Several implementations of MPI are available, the most commonly used being MPICH2 and OpenMPI.

   Note

   The bin directory of your MPI installation must be in your $PATH

2. A version of HDF5/NetCDF4 compiled with parallel I/O enabled, using the MPI implementation installed above. This is not the default way to compile NetCDF, and must be explicitly enabled. More information on how to do this can be found on the NetCDF website.