
int  hwloc_distances_get (hwloc_topology_t topology, unsigned *nr, struct hwloc_distances_s **distances, unsigned long kind, unsigned long flags) 

int  hwloc_distances_get_by_depth (hwloc_topology_t topology, int depth, unsigned *nr, struct hwloc_distances_s **distances, unsigned long kind, unsigned long flags) 

int  hwloc_distances_get_by_type (hwloc_topology_t topology, hwloc_obj_type_t type, unsigned *nr, struct hwloc_distances_s **distances, unsigned long kind, unsigned long flags) 

int  hwloc_distances_get_by_name (hwloc_topology_t topology, const char *name, unsigned *nr, struct hwloc_distances_s **distances, unsigned long flags) 

const char *  hwloc_distances_get_name (hwloc_topology_t topology, struct hwloc_distances_s *distances) 

void  hwloc_distances_release (hwloc_topology_t topology, struct hwloc_distances_s *distances) 

◆ hwloc_distances_kind_e
Kinds of distance matrices.
The kind attribute of struct hwloc_distances_s is a OR'ed set of kinds.
A kind of format HWLOC_DISTANCES_KIND_FROM_* specifies where the distance information comes from, if known.
A kind of format HWLOC_DISTANCES_KIND_MEANS_* specifies whether values are latencies or bandwidths, if applicable.
Enumerator 

HWLOC_DISTANCES_KIND_FROM_OS  These distances were obtained from the operating system or hardware.

HWLOC_DISTANCES_KIND_FROM_USER  These distances were provided by the user.

HWLOC_DISTANCES_KIND_MEANS_LATENCY  Distance values are similar to latencies between objects. Values are smaller for closer objects, hence minimal on the diagonal of the matrix (distance between an object and itself). It could also be the number of network hops between objects, etc.

HWLOC_DISTANCES_KIND_MEANS_BANDWIDTH  Distance values are similar to bandwidths between objects. Values are higher for closer objects, hence maximal on the diagonal of the matrix (distance between an object and itself). Such values are currently ignored for distancebased grouping.

HWLOC_DISTANCES_KIND_HETEROGENEOUS_TYPES  This distances structure covers objects of different types.

◆ hwloc_distances_get()
Retrieve distance matrices.
Retrieve distance matrices from the topology into the distances array.
flags is currently unused, should be 0 .
kind serves as a filter. If 0 , all distance matrices are returned. If it contains some HWLOC_DISTANCES_KIND_FROM_*, only distance matrices whose kind matches one of these are returned. If it contains some HWLOC_DISTANCES_KIND_MEANS_*, only distance matrices whose kind matches one of these are returned.
On input, nr points to the number of distance matrices that may be stored in distances . On output, nr points to the number of distance matrices that were actually found, even if some of them couldn't be stored in distances . Distance matrices that couldn't be stored are ignored, but the function still returns success (0 ). The caller may find out by comparing the value pointed by nr before and after the function call.
Each distance matrix returned in the distances array should be released by the caller using hwloc_distances_release().
◆ hwloc_distances_get_by_depth()
int hwloc_distances_get_by_depth 
( 
hwloc_topology_t 
topology, 


int 
depth, 


unsigned * 
nr, 


struct hwloc_distances_s ** 
distances, 


unsigned long 
kind, 


unsigned long 
flags 

) 
 
Retrieve distance matrices for object at a specific depth in the topology.
Identical to hwloc_distances_get() with the additional depth filter.
◆ hwloc_distances_get_by_name()
Retrieve a distance matrix with the given name.
Usually only one distances structure may match a given name.
◆ hwloc_distances_get_by_type()
Retrieve distance matrices for object of a specific type.
Identical to hwloc_distances_get() with the additional type filter.
◆ hwloc_distances_get_name()
Get a description of what a distances structure contains.
For instance "NUMALatency" for hardwareprovided NUMA distances (ACPI SLIT), or NULL if unknown.
◆ hwloc_distances_release()

