[Openmp-commits] [PATCH] D97079: [OpenMP] libomp: eliminate pause from atomic CAS loops

[Jon Chesterfield via Phabricator via Openmp-commits]

JonChesterfield added a comment.

I think this is architecture specific.

If a CAS failed spuriously, then immediately retry is good. If it failed because another core wrote to the cache line, then we have established that said cache line is somewhat contended, in which case pause() may let the other threads progress faster.

This might be difficult to microbenchmark.


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