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 name of this distances structure is "NUMALatency". Others distance structures include and "XGMIBandwidth", "XGMIHops" and "NVLinkBandwidth".
The matrix may also contain bandwidths between random sets of objects, possibly provided by the user, as specified in the
values should not be replaced, reallocated, freed, etc. However callers are allowed to modify
kind as well as the contents of
values arrays. For instance, if there is a single NUMA node per Package, hwloc_get_obj_with_same_locality() may be used to convert between them and replace NUMA nodes in the
objs array with the corresponding Packages. See also hwloc_distances_transform() for applying some transformations to the structure.