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Add workaround for MPI/UCX environment #196

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Jul 19, 2023
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Add workaround for MPI/UCX environment #196

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15 changes: 12 additions & 3 deletions mpi.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -211,9 +211,6 @@ If the host MPI is Open MPI, the definition file looks like:
export PATH="$OMPI_DIR/bin:$PATH"
export LD_LIBRARY_PATH="$OMPI_DIR/lib:$LD_LIBRARY_PATH"
export MANPATH="$OMPI_DIR/share/man:$MANPATH"
# Work around a problem that UCX has with unprivileged user namespaces
# See https://github.com/apptainer/apptainer/issues/769
export UCX_POSIX_USE_PROC_LINK=n

%post
echo "Installing required packages..."
Expand Down Expand Up @@ -248,6 +245,18 @@ If the host MPI is Open MPI, the definition file looks like:
Consult your system documentation, or ask your support staff for
details.

.. note::

The MPI UCX library has a problem with unprivileged user namespaces.
See `apptainer issue 769
<https://github.com/apptainer/apptainer/issues/769 >`__
for details and for now use the ``UCX_TLS=sysv,ib`` transport as a
workaround, for example:

.. code::

mpirun -np 2 -mca pml ucx -x UCX_TLS=sysv,ib apptainer exec $MY_CONTAINER ./a.out

Running an MPI Application
==========================

Expand Down