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Launching only on the local node
================================
It is common to develop applications on a single workstation or
laptop, and then move to a larger parallel / HPC environment once the
application is ready.
PRRTE supports running multi-process jobs on a single machine.
In such cases, you can simply avoid listing a hostfile or remote
hosts, and simply list a number of processes to launch. For
example:
.. code-block:: sh
shell$ prterun -n 6 mpi-hello-world
Hello world, I am 0 of 6 (running on my-laptop))
Hello world, I am 1 of 6 (running on my-laptop)
...
Hello world, I am 5 of 6 (running on my-laptop)
If you do not specify the ``-n`` option, ``prterun`` will default to
launching as many processes as there are processor cores (not
hyperthreads) on the machine.
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