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

NAME
       hwloc-distances - Displays distance matrices

SYNOPSIS
       hwloc-distances [options]

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-
	      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.

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

       -v --verbose
	      Verbose messages.

       --version
	      Report version and exit.

DESCRIPTION
       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-
       ces.

       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.

EXAMPLES
       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

RETURN VALUE
       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.

SEE ALSO
       hwloc(7), lstopo(1)

1.7					   Apr 07, 2013 		       HWLOC-DISTANCES(1)
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