xenial (1) hwloc-info.1.gz

NAME

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

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

       -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.

       -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, hwloc-info prints a summary  of
       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)