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hwloc_distances_s(3) Hardware Locality (hwloc) hwloc_distances_s(3)

NAME

hwloc_distances_s

SYNOPSIS

#include <distances.h>

Data Fields


unsigned nbobjs
hwloc_obj_t * objs
unsigned long kind
hwloc_uint64_t * values

Detailed Description

Matrix of distances between a set of objects.

This matrix often 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 physically accurate. It corresponds to the latency for accessing the memory of one node from a core in another node. The corresponding kind is HWLOC_DISTANCES_KIND_FROM_OS | HWLOC_DISTANCES_KIND_FROM_USER.

The matrix may also contain bandwidths between random sets of objects, possibly provided by the user, as specified in the kind attribute.

Field Documentation

unsigned long hwloc_distances_s::kind

OR'ed set of hwloc_distances_kind_e.

unsigned hwloc_distances_s::nbobjs

Number of objects described by the distance matrix.

hwloc_obj_t* hwloc_distances_s::objs

Array of objects described by the distance matrix. These objects are not in any particular order, see hwloc_distances_obj_index() and hwloc_distances_obj_pair_values() for easy ways to find objects in this array and their corresponding values.

hwloc_uint64_t* hwloc_distances_s::values

Matrix of distances between objects, stored as a one-dimension array. Distance from i-th to j-th object is stored in slot i*nbobjs+j. The meaning of the value depends on the kind attribute.

Author

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Mon Mar 30 2020 Version 2.2.0