Structure of a topology object. More...

#include <hwloc.h>

Data Fields
hwloc_obj_type_t	type
	Type of object.
unsigned	os_index
	OS-provided physical index number.
char *	name
	Object description if any.
struct hwloc_obj_memory_s	memory
	Memory attributes.
union hwloc_obj_attr_u *	attr
	Object type-specific Attributes, may be `NULL` if no attribute value was found.
unsigned	depth
	Vertical index in the hierarchy.
unsigned	logical_index
	Horizontal index in the whole list of similar objects, could be a "cousin_rank" since it's the rank within the "cousin" list below.
signed	os_level
	OS-provided physical level, -1 if unknown or meaningless.
struct hwloc_obj *	next_cousin
	Next object of same type and depth.
struct hwloc_obj *	prev_cousin
	Previous object of same type and depth.
struct hwloc_obj *	parent
	Parent, `NULL` if root (system object)
unsigned	sibling_rank
	Index in parent's `children`[] array.
struct hwloc_obj *	next_sibling
	Next object below the same parent.
struct hwloc_obj *	prev_sibling
	Previous object below the same parent.
unsigned	arity
	Number of children.
struct hwloc_obj **	children
	Children, `children`[0 .. arity -1].
struct hwloc_obj *	first_child
	First child.
struct hwloc_obj *	last_child
	Last child.
void *	userdata
	Application-given private data pointer, initialized to `NULL`, use it as you wish.
hwloc_cpuset_t	cpuset
	CPUs covered by this object.
hwloc_cpuset_t	complete_cpuset
	The complete CPU set of logical processors of this object,.
hwloc_cpuset_t	online_cpuset
	The CPU set of online logical processors.
hwloc_cpuset_t	allowed_cpuset
	The CPU set of allowed logical processors.
hwloc_nodeset_t	nodeset
	NUMA nodes covered by this object or containing this object.
hwloc_nodeset_t	complete_nodeset
	The complete NUMA node set of this object,.
hwloc_nodeset_t	allowed_nodeset
	The set of allowed NUMA memory nodes.
struct hwloc_distances_s **	distances
	Distances between all objects at same depth below this object.
unsigned	distances_count
struct hwloc_obj_info_s *	infos
	Array of stringified info type=name.
unsigned	infos_count
	Size of infos array.

Detailed Description

Structure of a topology object.

Applications must not modify any field except hwloc_obj.userdata.

Field Documentation

hwloc_cpuset_t hwloc_obj::allowed_cpuset

The CPU set of allowed logical processors.

This includes the CPUs contained in this object which are allowed for binding, i.e. passing them to the hwloc binding functions should not return permission errors. This is usually restricted by administration rules. Some of them may however be offline so binding to them may still not be possible, see online_cpuset.

Note:: Its value must not be changed, hwloc_bitmap_dup must be used instead.

hwloc_nodeset_t hwloc_obj::allowed_nodeset

The set of allowed NUMA memory nodes.

This includes the NUMA memory nodes contained in this object which are allowed for memory allocation, i.e. passing them to NUMA node-directed memory allocation should not return permission errors. This is usually restricted by administration rules.

If there are no NUMA nodes in the machine, all the memory is close to this object, so allowed_nodeset is full.

Note:: Its value must not be changed, hwloc_bitmap_dup must be used instead.

unsigned hwloc_obj::arity

Number of children.

union hwloc_obj_attr_u* hwloc_obj::attr

Object type-specific Attributes, may be NULL if no attribute value was found.

struct hwloc_obj** hwloc_obj::children

Children, children[0 .. arity -1].

hwloc_cpuset_t hwloc_obj::complete_cpuset

The complete CPU set of logical processors of this object,.

This includes not only the same as the cpuset field, but also the CPUs for which topology information is unknown or incomplete, and the CPUs that are ignored when the HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM flag is not set. Thus no corresponding PU object may be found in the topology, because the precise position is undefined. It is however known that it would be somewhere under this object.

Note:: Its value must not be changed, hwloc_bitmap_dup must be used instead.

hwloc_nodeset_t hwloc_obj::complete_nodeset

The complete NUMA node set of this object,.

This includes not only the same as the nodeset field, but also the NUMA nodes for which topology information is unknown or incomplete, and the nodes that are ignored when the HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM flag is not set. Thus no corresponding NODE object may be found in the topology, because the precise position is undefined. It is however known that it would be somewhere under this object.

If there are no NUMA nodes in the machine, all the memory is close to this object, so complete_nodeset is full.

Note:: Its value must not be changed, hwloc_bitmap_dup must be used instead.

hwloc_cpuset_t hwloc_obj::cpuset

CPUs covered by this object.

This is the set of CPUs for which there are PU objects in the topology under this object, i.e. which are known to be physically contained in this object and known how (the children path between this object and the PU objects).

If the HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM configuration flag is set, some of these CPUs may be offline, or not allowed for binding, see online_cpuset and allowed_cpuset.

Note:: Its value must not be changed, hwloc_bitmap_dup must be used instead.

unsigned hwloc_obj::depth

Vertical index in the hierarchy.

struct hwloc_distances_s** hwloc_obj::distances

Distances between all objects at same depth below this object.

unsigned hwloc_obj::distances_count

struct hwloc_obj* hwloc_obj::first_child

First child.

struct hwloc_obj_info_s* hwloc_obj::infos

Array of stringified info type=name.

unsigned hwloc_obj::infos_count

Size of infos array.

struct hwloc_obj* hwloc_obj::last_child

Last child.

unsigned hwloc_obj::logical_index

Horizontal index in the whole list of similar objects, could be a "cousin_rank" since it's the rank within the "cousin" list below.

struct hwloc_obj_memory_s hwloc_obj::memory

Memory attributes.

char* hwloc_obj::name

Object description if any.

struct hwloc_obj* hwloc_obj::next_cousin

Next object of same type and depth.

struct hwloc_obj* hwloc_obj::next_sibling

Next object below the same parent.

hwloc_nodeset_t hwloc_obj::nodeset

NUMA nodes covered by this object or containing this object.

This is the set of NUMA nodes for which there are NODE objects in the topology under or above this object, i.e. which are known to be physically contained in this object or containing it and known how (the children path between this object and the NODE objects).

In the end, these nodes are those that are close to the current object.

If the HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM configuration flag is set, some of these nodes may not be allowed for allocation, see allowed_nodeset.

If there are no NUMA nodes in the machine, all the memory is close to this object, so nodeset is full.

Note:: Its value must not be changed, hwloc_bitmap_dup must be used instead.

hwloc_cpuset_t hwloc_obj::online_cpuset

The CPU set of online logical processors.

This includes the CPUs contained in this object that are online, i.e. draw power and can execute threads. It may however not be allowed to bind to them due to administration rules, see allowed_cpuset.