hwlocality_helper_ancestors

Section: Hardware Locality (hwloc) (3)
Updated: Thu Feb 11 2021
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NAME

hwlocality_helper_ancestors - Looking at Ancestor and Child Objects

SYNOPSIS

Functions

static hwloc_obj_t hwloc_get_ancestor_obj_by_depth (hwloc_topology_t topology, int depth, hwloc_obj_t obj)

static hwloc_obj_t hwloc_get_ancestor_obj_by_type (hwloc_topology_t topology, hwloc_obj_type_t type, hwloc_obj_t obj)

static hwloc_obj_t hwloc_get_common_ancestor_obj (hwloc_topology_t topology, hwloc_obj_t obj1, hwloc_obj_t obj2)

static int hwloc_obj_is_in_subtree (hwloc_topology_t topology, hwloc_obj_t obj, hwloc_obj_t subtree_root)

static hwloc_obj_t hwloc_get_next_child (hwloc_topology_t topology, hwloc_obj_t parent, hwloc_obj_t prev)

Detailed Description

Be sure to see the figure in Terms and Definitions that shows a complete topology tree, including depths, child/sibling/cousin relationships, and an example of an asymmetric topology where one package has fewer caches than its peers.

Function Documentation

static hwloc_obj_t hwloc_get_ancestor_obj_by_depth (hwloc_topology_t topology, int depth, hwloc_obj_t obj) [inline], [static]

Returns the ancestor object of obj at depth depth.

Note

: depth should not be the depth of PU or NUMA objects since they are ancestors of no objects (except Misc or I/O). This function rather expects an intermediate level depth, such as the depth of Packages, Cores, or Caches.

static hwloc_obj_t hwloc_get_ancestor_obj_by_type (hwloc_topology_t topology, hwloc_obj_type_t type, hwloc_obj_t obj) [inline], [static]

Returns the ancestor object of obj with type type.

Note

: type should not be HWLOC_OBJ_PU or HWLOC_OBJ_NUMANODE since these objects are ancestors of no objects (except Misc or I/O). This function rather expects an intermediate object type, such as HWLOC_OBJ_PACKAGE, HWLOC_OBJ_CORE, etc.

static hwloc_obj_t hwloc_get_common_ancestor_obj (hwloc_topology_t topology, hwloc_obj_t obj1, hwloc_obj_t obj2) [inline], [static]

Returns the common parent object to objects obj1 and obj2.

static hwloc_obj_t hwloc_get_next_child (hwloc_topology_t topology, hwloc_obj_t parent, hwloc_obj_t prev) [inline], [static]

Return the next child. Return the next child among the normal children list, then among the memory children list, then among the I/O children list, then among the Misc children list.

If prev is NULL, return the first child.

Return NULL when there is no next child.

static int hwloc_obj_is_in_subtree (hwloc_topology_t topology, hwloc_obj_t obj, hwloc_obj_t subtree_root) [inline], [static]

Returns true if obj is inside the subtree beginning with ancestor object subtree_root.

Note

: This function cannot work if obj and subtree_root objects do not have CPU sets (I/O or Misc objects).

Author

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