OMPI_INFO(1) Open MPI OMPI_INFO(1)
NAME
ompi_info - Display information about the Open MPI installation
SYNOPSIS
ompi_info [options]
DESCRIPTION
ompi_info provides detailed information about the Open MPI installa-
tion. It can be useful for at least three common scenarios:
1. Checking local configuration and seeing how Open MPI was installed.
2. Submitting bug reports / help requests to the Open MPI community
(see http://www.open-mpi.org/community/help/)
3. Seeing a list of installed Open MPI plugins and querying what MCA
parameters they support.
NOTE: ompi_info defaults to only showing a few MCA parameters by de-
fault (i.e., level 1 parameters). Use the --level option to enable
showing more options (see the LEVELS section for more information).
OPTIONS
ompi_info accepts the following options:
-a|--all
Show all configuration options and MCA parameters. Also
changes the default MCA parameter level to 9, unless --level is
also specified.
--arch Show architecture on which Open MPI was compiled.
-c|--config
Show configuration options
-gmca|--gmca <param> <value>
Pass global MCA parameters that are applicable to all contexts.
-h|--help
Shows help / usage message.
--hostname
Show the hostname on which Open MPI was configured and built.
--internal
Show internal MCA parameters (not meant to be modified by
users).
--level <level>
Show only variables with at most this level (1-9). The default
is 1 unless --all is specified without --level, in which case
the default is 9. See the LEVELS section for more information.
-mca|--mca <param> <value>
Pass context-specific MCA parameters; they are considered
global if --gmca is not used and only one context is specified.
--param <type> <component>
Show MCA parameters. The first parameter is the type of the
component to display; the second parameter is the specific com-
ponent to display (or the keyword "all", meaning "display all
components of this type").
-t|--type
Show MCA parameters of the type specified in the parameter. Ac-
cepts the following parameters: unsigned_int, unsigned_long,
unsigned_long_long, size_t, string, version_string, bool, dou-
ble. By default level is 1 unless it is specified with --level.
--parsable
When used in conjunction with other parameters, the output is
displayed in a machine-parsable format --parseable Synonym for
--parsable
--path <type>
Show paths that Open MPI was configured with. Accepts the fol-
lowing parameters: prefix, bindir, libdir, incdir, pkglibdir,
sysconfdir.
--pretty
When used in conjunction with other parameters, the output is
displayed in 'prettyprint' format (default)
--selected-only
Show only variables from selected components.
-V|--version
Show version of Open MPI.
LEVELS
Open MPI has many, many run-time tunable parameters (called "MCA param-
eters"), and usually only a handfull of them are useful to a given
user.
As such, Open MPI has divided these parameters up into nine distinct
levels, broken down into three categories, each with three sub-cate-
gories.
Note that since each MCA parameter is accessible through the MPI_T con-
trol variable API (introduced in MPI-3.0), these levels exactly corre-
spond to the nine MPI_T cvar levels.
The three categories are:
End user
Generally, these are parameters that are required for correctness,
meaning that a user may need to set these just to get their MPI ap-
plication to run correctly. For example, BTL "if_include" and
"if_exclude" parameters fit into this category.
Application tuner
Generally, these are parameters that can be used to tweak MPI ap-
plication performance. This even includes parameters that control
resource exhaustion levels (e.g., number of free list entries, size
of buffers, etc.), and could be considered "correctness" parameters
if they're set too low. But, really -- they're tuning parameters.
Open MPI developer
Parameters in this category either don't fit in the other two, or
are specifically intended for debugging / development of Open MPI
itself.
And within each category, there are three sub-categories:
Basic
This sub-category is for parameters that everyone in this category
will want to see -- even less-advanced end users, application
tuners, and new OMPI developers.
Detailed
This sub-category is for parameters that are generally useful, but
users probably won't need to change them often.
All This sub-category is for all other parameters. Such parameters are
likely fairly esoteric.
Combining the categories and sub-categories, here's how Open MPI de-
fines all nine levels:
1 Basic information of interest to end users.
2 Detailed information of interest to end users.
3 All remaining information of interest to end users.
4 Basic information required for application tuners.
5 Detailed information required for application tuners.
6 All remaining information required for application tuners.
7 Basic information for Open MPI implementors.
8 Detailed information for Open MPI implementors.
9 All remaining information for Open MPI implementors.
By default, ompi_info only shows level 1 MCA parameters. To see more
MCA parameters, use the --level command line option.
EXAMPLES
ompi_info
Show the default output of options and listing of installed compo-
nents in a human-readable / prettyprint format.
ompi_info --parsable
Show the default output of options and listing of installed compo-
nents in a machine-parsable format.
ompi_info --param btl tcp
Show the level 1 MCA parameters of the "tcp" BTL component in a hu-
man-readable / prettyprint format.
ompi_info --param btl tcp --level 6
Show the level 1 through level 6 MCA parameters of the "tcp" BTL
component in a human-readable / prettyprint format.
ompi_info --param btl tcp --parsable
Show the level 1 MCA parameters of the "tcp" BTL component in a ma-
chine-parsable format.
ompi_info --type string --pretty-print --level 3
Show the level 3 MCA parameters of string type in a human-readable
/ prettyprint format.
ompi_info --path bindir
Show the "bindir" that Open MPI was configured with.
ompi_info --version
Show the version of Open MPI version numbers in a prettyprint for-
mat.
ompi_info --all
Show all information about the Open MPI installation, including all
components that can be found, all the MCA parameters that they sup-
port (i.e., levels 1 through 9), versions of Open MPI and the com-
ponents, etc.
AUTHORS
The Open MPI maintainers -- see http://www.openmpi.org/ or the file AU-
THORS.
This manual page was originally contributed by Dirk Eddelbuettel
<edd@debian.org>, one of the Debian GNU/Linux maintainers for Open MPI,
and may be used by others.
4.1.2 Nov 24, 2021 OMPI_INFO(1)
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