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NAME

       ompi_info - Display information about the Open MPI installation

SYNOPSIS

       ompi_info [options]

DESCRIPTION

       ompi_info provides detailed information about the Open MPI installation.  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 default  (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 component 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. Accepts the  following
               parameters:   unsigned_int,  unsigned_long,  unsigned_long_long,  size_t,  string,
               version_string, bool, double. 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  following  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 parameters"), 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-categories.

       Note that since each MCA parameter is accessible through the MPI_T  control  variable  API
       (introduced in MPI-3.0), these levels exactly correspond 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 application 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 application 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 defines 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 components in a human-
           readable / prettyprint format.

       ompi_info --parsable
           Show the default output of options and listing of installed components in  a  machine-
           parsable format.

       ompi_info --param btl tcp
           Show  the  level  1  MCA  parameters  of the "tcp" BTL component in a human-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 machine-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 format.

       ompi_info --all
           Show  all  information  about the Open MPI installation, including all components that
           can be found, all the MCA parameters that they support (i.e.,  levels  1  through  9),
           versions of Open MPI and the components, etc.

AUTHORS

       The Open MPI maintainers -- see http://www.openmpi.org/ or the file AUTHORS.

       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.