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The two most common choices would be 68 and 1 for 68 and 1 max possible independent commands at the same time. As long as you are letting the individual programs allocate the number of threads (ie --threads for some programs, -p or -j for others), this choice will not matter. If you want to run multiple commands at the same time (say with a commands file which puts each individual command in the background) you would need to select at least a number equal to the number of commands you want running at the same time (or 68 as the max).

Because the selection you make is stored in the file located at $HOME/.idevrc you either need to edit that file, or supply additional options to the idev command. If you want to permanently change the default, use the nano program, to edit the numerical value on the idev_tpn_noormal line. If you want to leave the default alone, and modify it just for the idev session you are currently creating, add one of the following options:

1. -n 1 -N 1
2. -n 68 -N 1

Note that in the above, it is the lowercase n that determines the number of tasks per node (1 and 68 respectively). The upper case N deals with how many different nodes (computers) you want access to. Programs can not interact across different nodes, so for idev sessions, you only ever want 1 "N"ode. There will be more information about this in Friday when working with the sbatch command.