Mithun Mohan 7a25505f5c Simulation of spread like pattern in worker thread to core binding in LPGEMM. ...

-In multi-threaded cases if a packed/close pattern thread to core
binding is used (e.g.: OMP_PROC_BIND=close and OMP_PLACES=core|threads),
LPGEMM (OMP framework) launches threads such that threads with adjacent
id's are bound to nearby (even adjacent) cores. Depending on the
processor architecture, multiple threads with adjacent id's can be bound
to cores sharing the same last level cache. However it was observed that
when these threads (with adjacent id's) access the B reorder buffer, the
last level cache access was suboptimal. This can be attributed to the
per thread reorder buffer block accesses and how it maps to the last
level cache.
-In these cases, m is small (<= 4 * MR) and n value is such that number
of NR blocks (n/NR) is less than available threads nt (like < 0.5 * nt).
In such cases, id's of the threads can be modified such that the number
of threads with adjacent id's bound to the last level cache can be
reduced. This looks similar to the spread pattern used in thread to core
binding. This reduces the load on last level cache due to reorder buffer
access and improves performance in these cases. A heuristic method is
used to detect whether thread to core binding follows close pattern
before applying the thread id modifications.

AMD-Internal: [SWLCSG-3185]
Change-Id: Ie3c87d56e0f7b59161a381f382cf4e2d5d02a591

2025-01-10 06:02:06 -05:00

..

aocl_gemm

Simulation of spread like pattern in worker thread to core binding in LPGEMM.

2025-01-10 06:02:06 -05:00

gemmd

Code cleanup: Copyright notices

2024-08-05 15:35:08 -04:00

CMakeLists.txt

Code cleanup: Copyright notices

2024-08-05 15:35:08 -04:00