hwlocality_object_sets(3) Hardware Locality (hwloc) hwlocality_object_sets(3)NAME
hwlocality_object_sets - Object Sets (hwloc_cpuset_t and
hwloc_nodeset_t)
Typedefs
typedef hwloc_bitmap_t hwloc_cpuset_t
typedef hwloc_const_bitmap_t hwloc_const_cpuset_t
typedef hwloc_bitmap_t hwloc_nodeset_t
typedef hwloc_const_bitmap_t hwloc_const_nodeset_t
Detailed Description
Hwloc uses bitmaps to represent two distinct kinds of object sets: CPU
sets (hwloc_cpuset_t) and NUMA node sets (hwloc_nodeset_t). These types
are both typedefs to a common back end type (hwloc_bitmap_t), and
therefore all the hwloc bitmap functions are applicable to both
hwloc_cpuset_t and hwloc_nodeset_t (see The bitmap API).
The rationale for having two different types is that even though the
actions one wants to perform on these types are the same (e.g., enable
and disable individual items in the set/mask), they're used in very
different contexts: one for specifying which processors to use and one
for specifying which NUMA nodes to use. Hence, the name difference is
really just to reflect the intent of where the type is used.
Typedef Documentation
typedef hwloc_const_bitmap_t hwloc_const_cpuset_t
A non-modifiable hwloc_cpuset_t.
typedef hwloc_const_bitmap_t hwloc_const_nodeset_t
A non-modifiable hwloc_nodeset_t.
typedef hwloc_bitmap_t hwloc_cpuset_t
A CPU set is a bitmap whose bits are set according to CPU physical OS
indexes. It may be consulted and modified with the bitmap API as any
hwloc_bitmap_t (see hwloc/bitmap.h).
Each bit may be converted into a PU object using
hwloc_get_pu_obj_by_os_index().
typedef hwloc_bitmap_t hwloc_nodeset_t
A node set is a bitmap whose bits are set according to NUMA memory node
physical OS indexes. It may be consulted and modified with the bitmap
API as any hwloc_bitmap_t (see hwloc/bitmap.h). Each bit may be
converted into a NUMA node object using
hwloc_get_numanode_obj_by_os_index().
When binding memory on a system without any NUMA node (when the whole
memory is considered as a single memory bank), the nodeset may be
either empty (no memory selected) or full (whole system memory
selected).
See also Converting between CPU sets and node sets.
Author
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Version 1.11.1 Thu Oct 15 2015 hwlocality_object_sets(3)
