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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
       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 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.
	       Accepts 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
	   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	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
	   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  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
       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.

2.1.1				 May 10, 2017			  OMPI_INFO(1)
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