hwloc_distances_s Struct Reference

Distances between objects. More...

#include <hwloc.h>

Data Fields
unsigned	relative_depth
	Relative depth of the considered objects below the object containing this distance information.
unsigned	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.
float *	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	latency_max
	The maximal value in the latency matrix.
float	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.

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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.

The distance may be a memory latency, as defined by the ACPI SLIT specification. If so, the latency pointer will not be NULL and the pointed array will contain non-zero values.

In the future, some other types of distances may be considered. In these cases, latency will be NULL.

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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.

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The documentation for this struct was generated from the following file:

• hwloc.h