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int | hwloc_topology_get_depth (hwloc_topology_t restrict topology) |
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int | hwloc_get_type_depth (hwloc_topology_t topology, hwloc_obj_type_t type) |
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int | hwloc_get_memory_parents_depth (hwloc_topology_t topology) |
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static int | hwloc_get_type_or_below_depth (hwloc_topology_t topology, hwloc_obj_type_t type) |
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static int | hwloc_get_type_or_above_depth (hwloc_topology_t topology, hwloc_obj_type_t type) |
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hwloc_obj_type_t | hwloc_get_depth_type (hwloc_topology_t topology, int depth) |
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unsigned | hwloc_get_nbobjs_by_depth (hwloc_topology_t topology, int depth) |
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static int | hwloc_get_nbobjs_by_type (hwloc_topology_t topology, hwloc_obj_type_t type) |
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static hwloc_obj_t | hwloc_get_root_obj (hwloc_topology_t topology) |
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hwloc_obj_t | hwloc_get_obj_by_depth (hwloc_topology_t topology, int depth, unsigned idx) |
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static hwloc_obj_t | hwloc_get_obj_by_type (hwloc_topology_t topology, hwloc_obj_type_t type, unsigned idx) |
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static hwloc_obj_t | hwloc_get_next_obj_by_depth (hwloc_topology_t topology, int depth, hwloc_obj_t prev) |
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static hwloc_obj_t | hwloc_get_next_obj_by_type (hwloc_topology_t topology, hwloc_obj_type_t type, hwloc_obj_t prev) |
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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.
◆ hwloc_get_type_depth_e
Enumerator |
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HWLOC_TYPE_DEPTH_UNKNOWN | No object of given type exists in the topology.
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HWLOC_TYPE_DEPTH_MULTIPLE | Objects of given type exist at different depth in the topology (only for Groups).
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HWLOC_TYPE_DEPTH_NUMANODE | Virtual depth for NUMA nodes.
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HWLOC_TYPE_DEPTH_BRIDGE | Virtual depth for bridge object level.
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HWLOC_TYPE_DEPTH_PCI_DEVICE | Virtual depth for PCI device object level.
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HWLOC_TYPE_DEPTH_OS_DEVICE | Virtual depth for software device object level.
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HWLOC_TYPE_DEPTH_MISC | Virtual depth for Misc object.
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HWLOC_TYPE_DEPTH_MEMCACHE | Virtual depth for MemCache object.
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◆ hwloc_get_depth_type()
◆ hwloc_get_memory_parents_depth()
Return the depth of parents where memory objects are attached.
Memory objects have virtual negative depths because they are not part of the main CPU-side hierarchy of objects. This depth should not be compared with other level depths.
If all Memory objects are attached to Normal parents at the same depth, this parent depth may be compared to other as usual, for instance for knowing whether NUMA nodes is attached above or below Packages.
- Returns
- The depth of Normal parents of all memory children if all these parents have the same depth. For instance the depth of the Package level if all NUMA nodes are attached to Package objects.
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HWLOC_TYPE_DEPTH_MULTIPLE if Normal parents of all memory children do not have the same depth. For instance if some NUMA nodes are attached to Packages while others are attached to Groups.
◆ hwloc_get_nbobjs_by_depth()
Returns the width of level at depth depth .
- Returns
- The number of objects at topology depth
depth .
-
0 if there are no objects at depth
depth .
◆ hwloc_get_nbobjs_by_type()
Returns the width of level type type .
- Returns
- The number of objects of type
type .
-
-1 if there are multiple levels with objects of that type, e.g. HWLOC_OBJ_GROUP.
-
0 if there are no objects at depth
depth .
◆ hwloc_get_next_obj_by_depth()
Returns the next object at depth depth .
- Returns
- The first object at depth
depth if prev is NULL .
-
The object after
prev at depth depth if prev is not NULL .
-
NULL if there is no such object.
◆ hwloc_get_next_obj_by_type()
Returns the next object of type type .
- Returns
- The first object of type
type if prev is NULL .
-
The object after
prev of type type if prev is not NULL .
-
NULL if there is no such object.
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NULL if there are multiple levels with objects of that type (e.g. HWLOC_OBJ_GROUP), the caller may fallback to hwloc_get_obj_by_depth().
◆ hwloc_get_obj_by_depth()
Returns the topology object at logical index idx from depth depth .
- Returns
- The object if it exists.
-
NULL if there is no object with this index and depth.
◆ hwloc_get_obj_by_type()
Returns the topology object at logical index idx with type type .
- Returns
- The object if it exists.
-
NULL if there is no object with this index and type.
-
NULL if there are multiple levels with objects of that type (e.g. HWLOC_OBJ_GROUP), the caller may fallback to hwloc_get_obj_by_depth().
◆ hwloc_get_root_obj()
Returns the top-object of the topology-tree.
Its type is HWLOC_OBJ_MACHINE.
This function cannot return NULL .
◆ hwloc_get_type_depth()
Returns the depth of objects of type type .
- Returns
- The depth of objects of type
type .
-
A negative virtual depth if a NUMA node, I/O or Misc object type is given. These objects are stored in special levels that are not CPU-related. This virtual depth may be passed to other hwloc functions such as hwloc_get_obj_by_depth() but it should not be considered as an actual depth by the application. In particular, it should not be compared with any other object depth or with the entire topology depth.
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HWLOC_TYPE_DEPTH_UNKNOWN if no object of this type is present on the underlying architecture, or if the OS doesn't provide this kind of information.
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HWLOC_TYPE_DEPTH_MULTIPLE if type HWLOC_OBJ_GROUP is given and multiple levels of Groups exist.
- Note
- If the type is absent but a similar type is acceptable, see also hwloc_get_type_or_below_depth() and hwloc_get_type_or_above_depth().
- See also
- hwloc_get_memory_parents_depth() for managing the depth of memory objects.
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hwloc_type_sscanf_as_depth() for returning the depth of objects whose type is given as a string.
◆ hwloc_get_type_or_above_depth()
Returns the depth of objects of type type or above.
If no object of this type is present on the underlying architecture, the function returns the depth of the first "present" object typically containing type .
This function is only meaningful for normal object types. If a memory, I/O or Misc object type is given, the corresponding virtual depth is always returned (see hwloc_get_type_depth()).
May return HWLOC_TYPE_DEPTH_MULTIPLE for HWLOC_OBJ_GROUP just like hwloc_get_type_depth().
◆ hwloc_get_type_or_below_depth()
Returns the depth of objects of type type or below.
If no object of this type is present on the underlying architecture, the function returns the depth of the first "present" object typically found inside type .
This function is only meaningful for normal object types. If a memory, I/O or Misc object type is given, the corresponding virtual depth is always returned (see hwloc_get_type_depth()).
May return HWLOC_TYPE_DEPTH_MULTIPLE for HWLOC_OBJ_GROUP just like hwloc_get_type_depth().
◆ hwloc_topology_get_depth()
Get the depth of the hierarchical tree of objects.
This is the depth of HWLOC_OBJ_PU objects plus one.
- Returns
- the depth of the object tree.
- Note
- NUMA nodes, I/O and Misc objects are ignored when computing the depth of the tree (they are placed on special levels).
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