[Openmp-commits] [PATCH] D152955: [OpenMP] Add skewed iteration distribution in static-steal schedule for hybrid systems

Jonathan Peyton via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Wed Jun 14 13:35:36 PDT 2023

jlpeyton created this revision.
jlpeyton added reviewers: tlwilmar, hbae, Nawrin.
Herald added subscribers: sunshaoce, guansong, yaxunl.
Herald added a project: All.
jlpeyton requested review of this revision.
Herald added a reviewer: jdoerfert.
Herald added subscribers: openmp-commits, jplehr, sstefan1.
Herald added a project: OpenMP.

This commit adds skewed distribution of iterations in dynamic
schedule (static steal) for hybrid systems when thread affinity is assigned.
Currently, it distributes the iterations at 60:40 ratio. Consider this loop with
dynamic schedule type, `for (int i = 0; i < 100; ++i)`

In a hybrid system with 20 processes (16 CORE and 4 ATOM core), 88 iterations
will be assigned to performance cores and 12 iterations will be assigned to
efficient cores. Each thread with CORE core will process 5
iterations + extras and with ATOM core will process 3 iterations.

  rG LLVM Github Monorepo



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