Data Fields¶

unsigned relative_depth
unsigned nbobjs
float * latency
float latency_max
float latency_base

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. Unless defined by the user, this currently 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 accurate. It corresponds to the latency for accessing the memory of one node from a core in another node.

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.