tree 8076b10985daf0e7d1c88d71e623bab4fb29b9fd
parent 04c446ccd224dd5365a161bc5835f999ce8af7ed
author Xing Xue <xingxue@outlook.com> 1711135508 -0400
committer Copybara-Service <copybara-worker@google.com> 1711135911 -0700

[OpenMP][AIX] Affinity implementation for AIX (#84984)

This patch implements `affinity` for AIX, which is quite different from
platforms such as Linux.
- Setting CPU affinity through masks and related functions are not
supported. System call `bindprocessor()` is used to bind a thread to one
CPU per call.
- There are no system routines to get the affinity info of a thread. The
implementation of `get_system_affinity()` for AIX gets the mask of all
available CPUs, to be used as the full mask only.
- Topology is not available from the file system. It is obtained through
system SRAD (Scheduler Resource Allocation Domain).

This patch has run through the libomp LIT tests successfully with
`affinity` enabled.

GitOrigin-RevId: d394f3a162b871668d0c8e8bf6a94922fa8698ae