CentOS 7.0 - man page for hwloc-distances (centos section 1)

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HWLOC-DISTANCES(1)			      hwloc			       HWLOC-DISTANCES(1)

       hwloc-distances - Displays distance matrices

       hwloc-distances [options]

       -l --logical
	      Display hwloc logical indexes (default) instead of physical/OS indexes.

       -p --physical
	      Display OS/physical indexes instead of hwloc logical indexes.

       -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-

       -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.

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

       -v --verbose
	      Verbose messages.

	      Report version and exit.

       hwloc-distances displays also distance matrices attached to the topology.  A breadth-first
       traversal of the topology is performed starting from the root to find all distance  matri-

       NOTE:  lstopo  may  also display distance matrices in its verbose textual output.  However
       lstopo only prints matrices that cover the entire topology while hwloc-distances also dis-
       plays matrices that ignore part of the topology.

       On a quad-socket opteron machine:

	   $ hwloc-distances
	   Latency matrix between 4 NUMANodes (depth 2) by logical indexes:
	     index     0     1	   2	 3
		 0 1.000 1.600 2.200 2.200
		 1 1.600 1.000 2.200 2.200
		 2 2.200 2.200 1.000 1.600
		 3 2.200 2.200 1.600 1.000

       Upon successful execution, hwloc-distances returns 0.

       hwloc-distances	will return nonzero if any kind of error occurs, such as (but not limited
       to) failure to parse the command line.

       hwloc(7), lstopo(1)

1.7					   Apr 07, 2013 		       HWLOC-DISTANCES(1)
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