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hwloc_distances_s(3) Library Functions Manual 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. The most common matrix 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_MEANS_LATENCY | HWLOC_DISTANCES_KIND_FROM_USER. The name of this distances structure is 'NUMALatency'. The matrix may also contain bandwidths between random sets of objects, possibly provided by the user, as specified in the kind attribute. Others common distance structures include and 'XGMIBandwidth', 'XGMIHops', 'XeLinkBandwidth' and 'NVLinkBandwidth'. Pointers objs and values should not be replaced, reallocated, freed, etc. However callers are allowed to modify kind as well as the contents of objs and 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. 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 Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code. Hardware Locality (hwloc) Version 2.11.2 hwloc_distances_s(3)
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