hwloc_distances_s(3) Hardware Locality (hwloc) hwloc_distances_s(3)
NAME
hwloc_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), as defined by the ACPI SLIT specification.
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. 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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the source code.
Version 1.8.1 Tue Feb 4 2014 hwloc_distances_s(3)
hwloc 1.8.1 - Generated Wed Jan 14 15:33:11 CST 2015