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README: Add more info about "backwards compatibility" #3055

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README: Add more info about "backwards compatibility" #3055

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16 changes: 15 additions & 1 deletion README
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ Copyright (c) 2004-2008 High Performance Computing Center Stuttgart,
University of Stuttgart. All rights reserved.
Copyright (c) 2004-2007 The Regents of the University of California.
All rights reserved.
Copyright (c) 2006-2016 Cisco Systems, Inc. All rights reserved.
Copyright (c) 2006-2017 Cisco Systems, Inc. All rights reserved.
Copyright (c) 2006-2011 Mellanox Technologies. All rights reserved.
Copyright (c) 2006-2012 Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2007 Myricom, Inc. All rights reserved.
Expand Down Expand Up @@ -1464,6 +1464,20 @@ processes in a single MPI job. If the versions are not exactly the
same everywhere, Open MPI is not guaranteed to work properly in any
scenario.

Backwards compatibility tends to work best when user applications are
dynamically linked to one version of the Open MPI / OSHMEM libraries,
and can be updated at run time to link to a new version of the Open
MPI / OSHMEM libraries.

For example, if an MPI / OSHMEM application links statically against
the libraries from Open MPI vX, then attempting to launch that
application with mpirun / oshrun from Open MPI vY is not guaranteed to
work (because it is mixing vX and vY of Open MPI in a single job).

Similarly, if using a container technology that internally bundles all
the libraries from Open MPI vX, attempting to launch that container
with mpirun / oshrun from Open MPI vY is not guaranteed to work.

Software Version Number
-----------------------

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