[OpenMP][AIX] Affinity implementation for AIX #84984
Conversation
|
@xingxue-ibm Need to rebase this. |
Done. Thanks for letting me know @brad0, appreciated! |
* Update the comment of function __kmp_affinity_create_cpuinfo_map() * Avoid compiler warning on unused argument abort_on_error of get_system_affinity
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.
|
Hi @brad0 @tstellar, We need to include this patch in the libomp of the next IBM OpenXL for AIX compiler deliverable which is built off LLVM v18. Can I request to cherry-pick this patch into |
The patch would have to be rebased for the branch as it does not apply cleanly as is, but it is doable. You're right that it is limited to AIX specific changes and doesn't touch anything else. This would be up to the release manager @tstellar and @shiltian . |
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. (cherry picked from commit d394f3a)
Thanks, @brad0! I've rebased the patch on |
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. (cherry picked from commit d394f3a)
This patch implements
affinityfor AIX, which is quite different from platforms such as Linux.bindprocessor()is used to bind a thread to one CPU per call.get_system_affinity()for AIX gets the mask of all available CPUs, to be used as the full mask only.This patch has run through the libomp LIT tests successfully with
affinityenabled.