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/usr/share/openmpi/help-mpi-common-sm.txt is in openmpi-common 2.1.1-8.

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The actual contents of the file can be viewed below.

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# -*- text -*-
#
# Copyright (c) 2009-2010 Cisco Systems, Inc.  All rights reserved.
# Copyright (c) 2010-2012 Los Alamos National Security, LLC.
#                         All rights reserved.
#
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# This is the US/English help file for Open MPI's common shmem support.
#
[mmap too small]
Open MPI requested a shared memory segment that was too small to do
anything useful.  This is likely an error in Open MPI itself.  If you
see this error, you should see if there is an update available for
Open MPI, and if not, contact the Open MPI developers.

  Local host:        %s
  Requested size:    %ul
  Control seg size:  %ul
  Data seg aligment: %ul
#
[unexpected message id]
Open MPI received an unexpected message ID during common sm initialization.
This is likely an error in Open MPI itself.  If you see this error, you should
see if there is an update available for Open MPI that addresses this issue, and
if not, contact the Open MPI developers.

  Local Host:          %s
  Expected Message ID: %s
  Message ID Received: %s