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This kind of packing can be performed with the help of an additional packing-wrapper script (jobPackWrapper.sh) that rules the independent execution of different codes (or different instances of the same code) to be ran by each of the srun-tasks spawned by srun. (It is important to understand that these instances do not interact with each other via MPI messaging.) The isolation of each code/instance should be performed via the logic included in this packingjob-pack-wrapper script.
In the following example, the packingjob-pack-wrapper creates 8 different output directories and then launches 8 different instances of the hello_nompi code. The output of each of the executions is saved in a different case directory and file. In this case, the executable do not receive any further parameters but, in practice, users should define the logic for their own purposes and, if needed, include the logic to receive different parameters for each instance.
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