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/usr/share/openmpi/help-mca-var.txt is in openmpi-common 2.0.2-2.

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The actual contents of the file can be viewed below.

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# -*- text -*-
#
# 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) 2008-2011 Cisco Systems, Inc.  All rights reserved.
# Copyright (c) 2013      Los Alamos National Security, LLC. All rights
#                         reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# This is the US/English help file for Open MPI MCA error messages.
#
[invalid-flag-combination]
ERROR: An invalid combination of flags was passed to mca_base_var_register.

  Variable: %s
  Flags:    %s %s
#
[default-only-param-set]
WARNING: A user-supplied value attempted to override the default-only MCA
variable named "%s".

The user-supplied value was ignored.
#
[missing-param-file]
Process %d Unable to locate the variable file "%s" in the following search path:
   %s
#
[deprecated-mca-env]
A deprecated MCA variable value was specified in the environment or
on the command line.  Deprecated MCA variables should be avoided;
they may disappear in future releases.

  Deprecated variable: %s
  New variable:        %s
#
[deprecated-mca-cli]
A deprecated MCA variable value was specified on the command line.  Deprecated
MCA variables should be avoided; they may disappear in future releases.

  Deprecated variable: %s
  New variable:        %s
#
[deprecated-mca-file]
A deprecated MCA variable value was specified in an MCA variable
file.  Deprecated MCA variables should be avoided; they may disappear
in future releases.

  Deprecated variable: %s
  Source file:         %s
  New variable:        %s
#
[mutually-exclusive-vars]
Two mutually-exclusive MCA variables were specified.  This can result
in undefined behavior, such as ignoring the components that the MCA
variables are supposed to affect.

  1st MCA variable: %s
    Source of value: %s
  2nd MCA variable: %s
    Source of value: %s
#
[re-register-with-different-type]
An MCA variable was re-registered with a different type (i.e., it was
either originally registered as an INT and re-registered as a STRING,
or it was originially registered as a STRING and re-registered as an
INT).  This a developer error; your job may abort.

  MCA variable name: %s
#
[var-name-conflict]
A name collision was detected on an MCA variable name. This can happen
if two components try to register the same variable with slightly
different name components. The conflicting variables are listed below:

  MCA variable name: %s
  New name: %s %s %s
  Existing name: %s %s %s
#
[overridden-param-set]
WARNING: A user-supplied value attempted to set a variable that is set
in the override variable file (openmpi-mca-params-override.conf).

  Variable: %s

The user-supplied value was ignored.
#
[invalid-value]
An invalid value was supplied for an MCA variable.

  Variable     : %s
  Value        : %s
#
[invalid-value-enum]
An invalid value was supplied for an enum variable.

  Variable     : %s
  Value        : %s
  Valid values : %s
#
[environment-only-param]
WARNING: The special MCA parameter "%s" was set in
an unexpected way, and is likely not working the way you want it to.

Specifically, this MCA parameter is "special" in that it can *only* be
set in the environment.  Setting this value in a file -- and sometimes
even on the command line -- will not work as intended.  The *only* way
to set this value is to set "OMPI_MCA_%s" in the environment before
starting your job.

  Value:      %s
  Source:     %s
#
[incorrect-env-list-param]
WARNING: The format of "mca_base_env_list" parameter is a delimited list of VAR=VAL or
VAR instances. By default, the delimiter is a semicolon: VAR1=VAL1;VAR2;VAR3=VAL3;...
You can set other via "mca_base_env_list_delimiter" parameter. If the delimiter is a
semicolon, the value of "mca_base_env_list" variable should be quoted to not interfere
with SHELL command line parsing. In the case where a value is not assigned to variable
VAR, the value will be taken from the current environment.
The following environment variable was not found in the environment:
  Variable:             %s
  MCA variable value:   %s
#
[incorrect-env-list-sep]
An invalid value was supplied for an MCA variable "mca_base_env_list_delimiter".
The "mca_base_env_list" variable will be ignored.
  Value:     %s