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
Display hwloc logical indexes (default) instead of physical/OS indexes.
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 the topology to the given cpuset.
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:
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.
1.7 Apr 07, 2013 HWLOC-DISTANCES(1)
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