As Greg said, the total number of workers is one less than the number of available processes. There is always one master process (with id = 1, and not considered a worker) and the remaining workers.
So for *julia -p 3 *you will get one master process and two workers. The documentation may be misleading in this context, as it says: Starting with julia -p n provides n worker processes on the local machine. But *nworkers()* is actually n-1. However, if you do a *@everywhere*, the expression will be executed on all n processes.
