11-30-2011
Thank you again for your contribution on this. Just ran the statement again on a slightly faster machine and achieved 0.41 seconds without indexes and 0.98 seconds with indexes. So the indexing strategy clearly needs some tweaking, but the overall approach is very promising.
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LEARN ABOUT CENTOS
hwloc-distances
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 matrices.
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 displays 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)