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Filename : openmpi-mca-params.conf
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#
# Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
#                         University Research and Technology
#                         Corporation.  All rights reserved.
# Copyright (c) 2004-2005 The University of Tennessee and The University
#                         of Tennessee Research Foundation.  All rights
#                         reserved.
# Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
#                         University of Stuttgart.  All rights reserved.
# Copyright (c) 2004-2005 The Regents of the University of California.
#                         All rights reserved.
# Copyright (c) 2006-2017 Cisco Systems, Inc.  All rights reserved
# Copyright (c) 2018      Intel, Inc. All rights reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#

# This is the default system-wide MCA parameters defaults file.
# Specifically, the MCA parameter "mca_param_files" defaults to a
# value of
# "$HOME/.openmpi/mca-params.conf:$sysconf/openmpi-mca-params.conf"
# (this file is the latter of the two).  So if the default value of
# mca_param_files is not changed, this file is used to set system-wide
# MCA parameters.  This file can therefore be used to set system-wide
# default MCA parameters for all users.  Of course, users can override
# these values if they want, but this file is an excellent location
# for setting system-specific MCA parameters for those users who don't
# know / care enough to investigate the proper values for them.

# Note that this file is only applicable where it is visible (in a
# filesystem sense).  Specifically, MPI processes each read this file
# during their startup to determine what default values for MCA
# parameters should be used.  mpirun does not bundle up the values in
# this file from the node where it was run and send them to all nodes;
# the default value decisions are effectively distributed.  Hence,
# these values are only applicable on nodes that "see" this file.  If
# $sysconf is a directory on a local disk, it is likely that changes
# to this file will need to be propagated to other nodes.  If $sysconf
# is a directory that is shared via a networked filesystem, changes to
# this file will be visible to all nodes that share this $sysconf.

# The format is straightforward: one per line, mca_param_name =
# rvalue.  Quoting is ignored (so if you use quotes or escape
# characters, they'll be included as part of the value).  For example:

# Disable run-time MPI parameter checking
#   mpi_param_check = 0

# Note that the value "~/" will be expanded to the current user's home
# directory.  For example:

# Change component loading path
#   mca_base_component_path = /usr/local/lib/openmpi:~/my_openmpi_components

# See "ompi_info --param all all --level 9" for a full listing of Open
# MPI MCA parameters available and their default values.

# Silence this warning on Debian, as many systems don't have openfabric
# but the warning breaks higher layers or application
btl_base_warn_component_unused=0
# Avoid openib an in case applications use fork: see https://github.com/ofiwg/libfabric/issues/6332
# If you wish to use openib and know your application is safe, remove the following:
# Similarly for UCX: https://github.com/open-mpi/ompi/issues/8367
mtl = ^ofi
btl = ^uct,openib,ofi
pml = ^ucx
osc = ^ucx,pt2pt