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Docs: MPI as Root (#6156)

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New versions of OpenMPI need `--allow-run-as-root` for
running as root:
  http://www.open-mpi.de/doc/v2.0/man1/mpirun.1.php#toc22
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Axel Huebl 2017-11-06 22:03:46 +01:00 committed by Todd Gamblin
parent dc78e60c83
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lib/spack/docs/workflows.rst
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@ -1208,6 +1208,9 @@ MPI
Due to the dependency on Fortran for OpenMPI, which is the spack default
implementation, consider adding ``gfortran`` to the ``apt-get install`` list.
Recent versions of OpenMPI will require you to pass ``--allow-run-as-root``
to your ``mpirun`` calls if started as root user inside Docker.
For execution on HPC clusters, it can be helpful to import the docker
image into Singularity in order to start a program with an *external*
MPI. Otherwise, also add ``openssh-server`` to the ``apt-get install`` list.