Ubuntu Manpage: Interoperability with Linux libnuma bitmask

Detailed Description

This interface helps converting between Linux libnuma bitmasks and hwloc cpusets and nodesets.

It also offers a consistent behavior on non-NUMA machines or non-NUMA-aware kernels by assuming that the machines have a single NUMA node.

Note:

Topology topology must match the current machine.

The behavior of libnuma is undefined if the kernel is not NUMA-aware. (when CONFIG_NUMA is not set in the kernel configuration). This helper and libnuma may thus not be strictly compatible in this case, which may be detected by checking whether numa_available() returns -1.

Function Documentation

static inline int hwloc_cpuset_from_linux_libnuma_bitmask (hwloc_topology_ttopology, hwloc_cpuset_tcpuset, const struct bitmask *bitmask) [static]

Convert libnuma bitmask bitmask into hwloc CPU set cpuset. This function may be used after calling many numa_ functions that use a struct bitmask as an output parameter.

static inline struct bitmask * hwloc_cpuset_to_linux_libnuma_bitmask (hwloc_topology_ttopology, hwloc_const_cpuset_tcpuset) [static]

Convert hwloc CPU set cpuset into the returned libnuma bitmask. The returned bitmask should later be freed with numa_bitmask_free.

This function may be used before calling many numa_ functions that use a struct bitmask as an input parameter.

Returns:

newly allocated struct bitmask.

static inline int hwloc_nodeset_from_linux_libnuma_bitmask (hwloc_topology_ttopology, hwloc_nodeset_tnodeset, const struct bitmask *bitmask) [static]

Convert libnuma bitmask bitmask into hwloc NUMA node set nodeset. This function may be used after calling many numa_ functions that use a struct bitmask as an output parameter.

static inline struct bitmask * hwloc_nodeset_to_linux_libnuma_bitmask (hwloc_topology_ttopology, hwloc_const_nodeset_tnodeset) [static]

Convert hwloc NUMA node set nodeset into the returned libnuma bitmask. The returned bitmask should later be freed with numa_bitmask_free.