-o experiment_name

Use experiment_name as the name of the experiment to be recorded. The experiment_name string must end in the string “.er”; if not, the collect utility prints an error message and exits.

If you do not specify the -o option, give the experiment a name of the form stem.n.er, where stem is a string, and n is a number. If you have specified a group name with the -g option, set stem to the group name without the .erg suffix. If you have not specified a group name, set stem to the string test.

If you are invoking the collect command from one of the commands used to run MPI jobs, for example, mpirun, but without the -M MPI-version option and the -o option, take the value of n used in the name from the environment variable used to define the MPI rank of that process. Otherwise, set n to one greater than the highest integer currently in use.

If the name is not specified in the form stem.n.er, and the given name is in use, an error message is displayed and the experiment is not run. If the name is of the form stem.n.er and the name supplied is in use, the experiment is recorded under a name corresponding to one greater than the highest value of n that is currently in use. A warning is displayed if the name is changed.