/usr/share/openmpi/help-mpi-btl-tcp.txt is in openmpi-common 2.1.1-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2009-2017 Cisco Systems, Inc. All rights reserved
# Copyright (c) 2015-2016 The University of Tennessee and The University
# of Tennessee Research Foundation. All rights
# reserved.
# Copyright (c) 2016 Research Organization for Information Science
# and Technology (RIST). All rights reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# This is the US/English help file for Open MPI's TCP support
# (the openib BTL).
#
[invalid if_inexclude]
WARNING: An invalid value was given for btl_tcp_if_%s. This
value will be ignored.
Local host: %s
Value: %s
Message: %s
#
[invalid minimum port]
WARNING: An invalid value was given for the btl_tcp_port_min_%s. Legal
values are in the range [1 .. 2^16-1]. This value will be ignored
(reset to the default value of 1024).
Local host: %s
Value: %d
#
[client connect fail]
WARNING: Open MPI failed to TCP connect to a peer MPI process. This
should not happen.
Your Open MPI job may now fail.
Local host: %s
PID: %d
Message: %s
Error: %s (%d)
#
[client handshake fail]
WARNING: Open MPI failed to handshake with a connecting peer MPI
process over TCP. This should not happen.
Your Open MPI job may now fail.
Local host: %s
PID: %d
Message: %s
#
[accept failed]
WARNING: The accept(3) system call failed on a TCP socket. While this
should generally never happen on a well-configured HPC system, the
most common causes when it does occur are:
* The process ran out of file descriptors
* The operating system ran out of file descriptors
* The operating system ran out of memory
Your Open MPI job will likely hang (or crash) until the failure
resason is fixed (e.g., more file descriptors and/or memory becomes
available), and may eventually timeout / abort.
Local host: %s
PID: %d
Errno: %d (%s)
#
[peer hung up]
An MPI communication peer process has unexpectedly disconnected. This
usually indicates a failure in the peer process (e.g., a crash or
otherwise exiting without calling MPI_FINALIZE first).
Although this local MPI process will likely now behave unpredictably
(it may even hang or crash), the root cause of this problem is the
failure of the peer -- that is what you need to investigate. For
example, there may be a core file that you can examine. More
generally: such peer hangups are frequently caused by application bugs
or other external events.
Local host: %s
Local PID: %d
Peer host: %s
#
[dropped inbound connection]
Open MPI detected an inbound MPI TCP connection request from a peer
that appears to be part of this MPI job (i.e., it identified itself as
part of this Open MPI job), but it is from an IP address that is
unexpected. This is highly unusual.
The inbound connection has been dropped, and the peer should simply
try again with a different IP interface (i.e., the job should
hopefully be able to continue).
Local host: %s
Local PID: %d
Peer hostname: %s (%s)
Source IP of socket: %s
Known IPs of peer: %s
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