LSTOPO(1)							       hwloc								 LSTOPO(1)

NAME

       lstopo  -  Show	the topology of the system (note that hwloc-bind(1) provides a detailed explanation of the hwloc system; it should be read
       before reading this man page).

SYNOPSIS

       lstopo [ options ]... [ filename ]

OPTIONS

       --of <format>, --output-format <format>
	      Enforce the output in the given format.  See the OUTPUT FORMATS section below.

       -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.

       -l --logical
	      Display hwloc logical indexes instead of physical/OS indexes (default for console output).  These indexes are  prefixed  with  "L#".
	      The physical indexes of some objects (PU and Node by default, all objects if verbose) will appear as object attribute "P#...".

       -p --physical
	      Display  OS/physical  indexes instead of hwloc logical indexes (default for graphical output).  These indexes are prefixed with "P#"
	      instead of "L#" in the console output.

       -c --cpuset
	      Display the cpuset of each object.

       -C --cpuset-only
	      Only display the cpuset of each object; do not display anything else about the object.

       --taskset
	      Show CPU set strings in the format recognized by the taskset command-line program instead of hwloc-specific CPU set  string  format.
	      This option should be combined with --cpuset or --cpuset-only, otherwise it will imply --cpuset.

       --only <type>
	      Only show objects of the given type in the textual output.

       --ignore <type>
	      Ignore all objects of type <type> in the topology.

       --no-caches
	      Do not show caches.

       --no-useless-caches
	      Do not show caches which do not have a hierarchical impact.

       --whole-system
	      Do not consider administration limitations.

       --merge
	      Do not show levels that do not have a hierarchical impact.

       --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-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, and show its current binding. Note that
	      this can for instance change the set of allowed processors. If 0 is given as pid, the current binding for the lstopo process will be
	      shown.

       --ps --top
	      Show existing processes as misc objects in the output. To avoid uselessly cluttering the output, only processes that are	restricted
	      to  some	part  of  the machine are shown.  On Linux, kernel threads are not shown.  If many processes appear, the output may become
	      hard to read anyway, making the hwloc-ps program more practical.

       --fontsize <size>
	      Set size of text font.

       --gridsize <size>
	      Set size of margin between elements.

       --horiz, --horiz=<type1,...>
	      Horizontal graphical layout instead of nearly 4/3 ratio.	If a comma-separated list of types is given, the layout  only  applies	to
	      the corresponding containers.

       --vert, --vert=<type1,...>
	      Vertical	graphical layout instead of nearly 4/3 ratio.  If a comma-separated list of types is given, the layout only applies to the
	      corresponding containers.

       --no-legend
	      Remove the text legend at the bottom.

       --version
	      Report version and exit.

DESCRIPTION

       lstopo is capable of displaying a topological map of the system in a variety of different output formats.  If no filename is specified  and
       the  DISPLAY environment variable is set, lstopo displays the map in a graphical window.  If no filename is specified and the DISPLAY envi-
       ronment variable is not set, a text summary is displayed.

       The filename specified directly implies the output format that will be used; see the OUTPUT FORMATS section, below.   Output  formats  that
       support color will indicate specific characteristics about individual CPUs by their color; see the COLORS section, below.

OUTPUT FORMATS

       The filename on the command line usually determines the format of the output.  There are a few filenames that indicate specific output for-
       mats and devices (e.g., a filename of "-" will output a text summary to stdout), but most filenames indicate the desired output	format	by
       their suffix (e.g., "topo.png" will output a PNG-format file).

       The format of the output may also be changed with "--of".  For instance, "--of pdf" will generate a PDF-format file on the standard output,
       while "--of fig toto" will output a Xfig-format file named "toto".

       The list of currently supported formats is given below. Any of them may be used with "--of" or as a filename suffix.

       default
	      Send the output to a window or to the console depending on the environment.

       console
	      Send a text summary to stdout.

       txt    Output an ASCII art representation of the map.  If outputting to stdout and if colors are supported on the terminal, the output will
	      be colorized.

       fig    Output a representation of the map that can be loaded in Xfig.

       pdf    If lstopo was compiled with the proper support, lstopo outputs a PDF representation of the map.

       ps     If lstopo was compiled with the proper support, lstopo outputs a Postscript representation of the map.

       png    If lstopo was compiled with the proper support, lstopo outputs a PNG representation of the map.

       svg    If lstopo was compiled with the proper support, lstopo outputs an SVG representation of the map.

       synthetic
	      If  the topology is symmetric, lstopo outputs a synthetic description string. This output may be reused as an input synthetic topol-
	      ogy description later.

       xml    If lstopo was compiled with the proper support, lstopo outputs an XML representation of the map.	It may be reused  later,  even	on
	      another machine, with lstopo --input, the HWLOC_XMLFILE environment variable, or the hwloc_topology_set_xml() function.

       The following special names may be used:

       -      Send a text summary to stdout.

       /dev/stdout
	      Send a text summary to stdout.  It is effectively the same as specifying "-".

       -.<format>
	      If  the entire filename is "-.<format>", lstopo behaves as if "--of <format> -" was given, which means a file of the given format is
	      sent to the standard output.

       See the output of "lstopo --help" for a specific list of what graphical output formats are supported in your hwloc installation.

COLORS

       Individual CPUs are colored in the semi-graphical and graphical output formats to indicate different characteristics:

       Green  The CPU is in the current CPU binding mask.

       White  The CPU is in the allowed set (see below), but it is not in the current CPU binding mask.

       Red    The CPU is not in the allowed set (see below).

       Black  The CPU is offline (not all OS's support displaying offline CPUs).

       The "allowed set" is the set of CPUs to which the current process is allowed to bind.  The allowed set is usually either inherited from the
       parent  process	or set by administrative qpolicies on the system.  Linux cpusets are one example of limiting the allowed set for a process
       and its children to be less than the full set of CPUs on the system.

       Different processes may therefore have different CPUs in the allowed set.  Hence, invoking lstopo in different contexts and/or as different
       users  may  display  different colors for the same individual CPUs (e.g., running lstopo in one context may show a specific CPU as red, but
       running lstopo in a different context may show the same CPU as white).

LAYOUT

       In its graphical output, lstopo uses simple rectangular heuristics to try to achieve a 4/3 ratio between width and height. However, in  the
       particular  case  of  NUMA  nodes,  the	layout	is always a flat rectangle, to avoid letting the user believe any particular NUMA topology
       (lstopo is not able to render that yet).

EXAMPLES

       To display the machine topology in textual mode:

	   lstopo -

       To display the machine topology in pseudo-graphical mode:

	   lstopo -.txt

       To display in graphical mode (assuming that the DISPLAY environment variable is set to a relevant value):

	   lstopo

       To export the topology to a PNG file:

	   lstopo file.png

       To export an XML file on a machine and later display the corresponding graphical output on another machine:

	   machine1$ lstopo file.xml
	   <transfer file.xml from machine1 to machine2>
	   machine2$ lstopo --input file.xml

       To save the current machine topology to XML and later reload it faster while still considering it as the current machine:

	  $ lstopo file.xml
	  <...>
	  $ lstopo --input file.xml --thissystem

       To restrict an XML topology to only physical processors 0, 1, 4 and 5:

	   lstopo --input file.xml --restrict 0x33 newfile.xml

       To restrict an XML topology to only numa node whose logical index is 1:

	   lstopo --input file.xml --restrict $(hwloc-calc --input file.xml node:1) newfile.xml

       To display a summary of the topology:

	   lstopo -s

       To get more details about the topology:

	   lstopo -v

       To only show cores:

	   lstopo --only core

       To show cpusets:

	   lstopo --cpuset

       To only show the cpusets of sockets:

	   lstopo --only socket --cpuset-only

       Simulate a fake hierarchy; this example shows with 2 NUMA nodes of 2 processor units:

	   lstopo --input "n:2 2"

       To count the number of logical processors in the system

	  lstopo --only pu | wc -l

SEE ALSO

       hwloc-bind(1), hwloc-ps(1), hwloc-gather-topology(1)

1.4.1								   Feb 27, 2012 							 LSTOPO(1)