OpenMPI  0.1.1
Linux-only helpers

This includes helpers for manipulating linux kernel cpumap files, and hwloc equivalents of the Linux sched_setaffinity and sched_getaffinity system calls. More...

Functions

HWLOC_DECLSPEC int hwloc_linux_parse_cpumap_file (FILE *file, hwloc_cpuset_t set)
 Convert a linux kernel cpumap file file into hwloc CPU set. More...
 
HWLOC_DECLSPEC int hwloc_linux_set_tid_cpubind (hwloc_topology_t topology, pid_t tid, hwloc_const_cpuset_t set)
 Bind a thread tid on cpus given in cpuset set. More...
 
HWLOC_DECLSPEC int hwloc_linux_get_tid_cpubind (hwloc_topology_t topology, pid_t tid, hwloc_cpuset_t set)
 Get the current binding of thread tid. More...
 

Detailed Description

This includes helpers for manipulating linux kernel cpumap files, and hwloc equivalents of the Linux sched_setaffinity and sched_getaffinity system calls.

Function Documentation

HWLOC_DECLSPEC int hwloc_linux_get_tid_cpubind ( hwloc_topology_t  topology,
pid_t  tid,
hwloc_cpuset_t  set 
)

Get the current binding of thread tid.

The behavior is exactly the same as the Linux sched_getaffinity system call, but uses a hwloc cpuset.

HWLOC_DECLSPEC int hwloc_linux_parse_cpumap_file ( FILE *  file,
hwloc_cpuset_t  set 
)

Convert a linux kernel cpumap file file into hwloc CPU set.

Might be used when reading CPU set from sysfs attributes such as topology and caches for processors, or local_cpus for devices.

References hwloc_bitmap_set_ith_ulong(), and hwloc_bitmap_zero().

Referenced by hwloc_cuda_get_device_cpuset(), hwloc_cudart_get_device_cpuset(), and hwloc_ibv_get_device_cpuset().

HWLOC_DECLSPEC int hwloc_linux_set_tid_cpubind ( hwloc_topology_t  topology,
pid_t  tid,
hwloc_const_cpuset_t  set 
)

Bind a thread tid on cpus given in cpuset set.

The behavior is exactly the same as the Linux sched_setaffinity system call, but uses a hwloc cpuset.