hwloc_distances_s(3) Hardware Locality (hwloc) hwloc_distances_s(3)NAMEhwloc_distances_s-
SYNOPSIS
#include <hwloc.h>
Data Fields
unsigned relative_depth
unsigned nbobjs
float * latency
float latency_max
float latency_base
Detailed Description
Distances between objects.
One object may contain a distance structure describing distances
between all its descendants at a given relative depth. If the
containing object is the root object of the topology, then the
distances are available for all objects in the machine.
If the latency pointer is not NULL, the pointed array contains memory
latencies (non-zero values), see below.
In the future, some other types of distances may be considered. In
these cases, latency may be NULL.
Field Documentation
float* hwloc_distances_s::latency
Matrix of latencies between objects, stored as a one-dimension array.
May be NULL if the distances considered here are not latencies. Unless
defined by the user, this currently contains latencies between NUMA
nodes (as reported in the System Locality Distance Information Table
(SLIT) in the ACPI specification), which may or may not be accurate. It
corresponds to the latency for accessing the memory of one node from a
core in another node.
Values are normalized to get 1.0 as the minimal value in the matrix.
Latency from i-th to j-th object is stored in slot i*nbobjs+j.
float hwloc_distances_s::latency_base
The multiplier that should be applied to latency matrix to retrieve the
original OS-provided latencies. Usually 10 on Linux since ACPI SLIT
uses 10 for local latency.
float hwloc_distances_s::latency_max
The maximal value in the latency matrix.
unsigned hwloc_distances_s::nbobjs
Number of objects considered in the matrix. It is the number of
descendant objects at relative_depth below the containing object. It
corresponds to the result of hwloc_get_nbobjs_inside_cpuset_by_depth().
unsigned hwloc_distances_s::relative_depth
Relative depth of the considered objects below the object containing
this distance information.
Author
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Version 1.11.1 Thu Oct 15 2015 hwloc_distances_s(3)
