NAME

       hwloc-info - Show some information about some objects or about a topology or about support features

SYNOPSIS

       hwloc-info [ options ]...  <object>...

       hwloc-info [ options ]...

       Note  that hwloc(7) provides a detailed explanation of the hwloc system and of valid <object> formats; it
       should be read before reading this man page.

OPTIONS

       --objects
              Report information specific objects.  This is the  default  if  some  objects  are  given  on  the
              command-line.

       --topology
              Report  a  summary of the topology instead of about some specific objects.  This is the default if
              no object is given on the command-line.

       --support
              Report the features that are supported by hwloc on the topology.  The features are those available
              through the hwloc_topology_get_support() function.  This is useful  for  verifying  which  CPU  or
              memory binding options are supported by the current hwloc installation.

       -i <file>, --input <file>
              Read topology from XML file <file> (instead of discovering the topology on the local machine).  If
              <file>  is  "-",  the standard input is used.  XML support must have been compiled in to hwloc for
              this option to be usable.

       -i <directory>, --input <directory>
              Read topology from the chroot specified by <directory> (instead of discovering the topology on the
              local machine).  This option is generally only available on Linux.  The chroot was usually created
              by gathering another machine topology with hwloc-gather-topology.

       -i <specification>, --input <specification>
              Simulate a fake hierarchy  (instead  of  discovering  the  topology  on  the  local  machine).  If
              <specification> is "node:2 pu:3", the topology will contain two NUMA nodes with 3 processing units
              in each of them.  The <specification> string must end with a number of PUs.

       --if <format>, --input-format <format>
              Enforce the input in the given format, among xml, fsroot and synthetic.

       -v --verbose
              Include additional detail.

       -s --silent
              Reduce the amount of details to show.  A single summary line per object is displayed.

       --ancestors
              Display  information  about  the  object  as well as about all its ancestors up to the root of the
              topology.

       --ancestor <type>
              Only display the object ancestors that match the given type.

       --children
              Display information about the object children.

       --descendants <type>
              Display information about the object descendants that match the given type.

       -n     When outputting object information, prefix each line with  the  index  of  the  considered  object
              within  the  input.   For  instance,  if three cores were given in input, the output lines will be
              prefixed with "0: ", "1: " or "2: ".  If --ancestor is also used, the prefix will be "X.Y: " where
              X is the index of the considered object within the input, and Y is the parent  index  (0  for  the
              object itself, increasing towards the root of the topology).

       --whole-system
              Do not consider administration limitations.

       --restrict <cpuset>
              Restrict the topology to the given cpuset.

       --restrict binding
              Restrict  the topology to the current process binding.  This option requires the use of the actual
              current machine topology (or any other topology with --thissystem or with HWLOC_THISSYSTEM set  to
              1 in the environment).

       --no-icaches
              Do not show Instruction caches, only Data and Unified caches are considered.

       --no-io
              Do not show any I/O device or bridge.  By default, common devices (GPUs, NICs, block devices, ...)
              and interesting bridges are shown.

       --no-bridges
              Do  not  show  any  I/O  bridge except hostbridges.  By default, common devices (GPUs, NICs, block
              devices, ...) and interesting bridges are shown.

       --whole-io
              Show all I/O devices and bridges.  By default, only common devices  (GPUs,  NICs,  block  devices,
              ...) and interesting bridges are shown.

       --thissystem
              Assume  that  the  selected  backend provides the topology for the system on which we are running.
              This is useful when using --restrict binding and loading a custom topology such as an XML file.

       --pid <pid>
              Detect topology as seen by process <pid>, i.e. as if process <pid> did the discovery itself.  Note
              that this can for instance change the set of allowed processors.  Also show this  process  current
              CPU  binding  by  marking  the corresponding PUs (in Green in the graphical output, see the COLORS
              section below, or by appending (binding) to the verbose text output).  If 0 is given as  pid,  the
              current binding for the lstopo process will be shown.

       -p --physical
              Use OS/physical indexes instead of logical indexes for input.

       -l --logical
              Use logical indexes instead of physical/OS indexes for input (default).

       --version
              Report version and exit.

DESCRIPTION

       hwloc-info displays information about the specified object.  It is intended to be used with tools such as
       grep  for  filtering certain attribute lines.  When no object is specified, or when --topology is passed,
       hwloc-info prints a summary of the topology.  When --support is passed, hwloc-info  lists  the  supported
       features for the topology.

       Objects  may be specified as location tuples, as explained in hwloc(7).  However hexadecimal bitmasks are
       not accepted since they may correspond to multiple objects.

       NOTE: It is highly recommended that you read the hwloc(7) overview page before  reading  this  man  page.
       Most of the concepts described in hwloc(7) directly apply to the hwloc-calc utility.

EXAMPLES

       To display information about each package:

           $ hwloc-info package:all
           Package L#0
            logical index = 0
           ...

       To display information about the core whose physical index is 2:

           $ utils/hwloc-info -p core:2
           Core L#1
            logical index = 1
            os index = 2
          ...

SEE ALSO

       hwloc(7), lstopo(1), hwloc-calc(1), hwloc-bind(1), hwloc-ps(1), hwloc-gather-topology(1)

1.11.9                                            Jan 18, 2018                                     HWLOC-INFO(1)