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FWIW, does seem to make a tiny difference: https://github.com/boostorg/boost_unordered_benchmarks/commit/2e194fa49378cb76fefe3e35e06206cedd6ff208
We at think-cell use that pattern a lot in our library.
gtl library author here. Very nice writeup! Reading it made me think, and I believe I know why gtl::parallel_flat_hash_map performs comparatively worse for high-skew scenarios (just pushed a fix in gtl).
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