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openifs@d1bd89ccc47f:~/openifs-48r1$ $OIFS_TEST/openifs-test.sh -cbt -j 2 --arch=""

where :

-c   creates source directory in $OIFS_HOME, which is used to bring all the sources, e.g. ifs-source, ifs-test and any packages in the bundle (ecbuild, eccodes etc.), together in preparation for the build

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• 21 3-D OpenIFS forecast-only tests with and without chemistry
• 1 SCM test (based on TWP-ICE)

-j is an optional argument that allows the user to define the number of threads used to create and build openifs, with the above example using 2 threads. It should be noted that 

• If -j is not supplied as a command line argument, as in the above example, the number of threads will default to 8 threads, which can be problematic for older and lower spec systems. For example, it will not work with a 4 core intel m3. The above example uses 2 threads, which should work on most systems.
• The number of threads can be increased to speed up the build step, but how much the number of threads can be increased to will depend on the system spec. Hence, please speak the local system administration for guidance about appropriate settings. 

--arch="" means no arch file is required because all the libraries and paths have been set-up locally in the docker container. 

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