The only significant issues I’ve seen is that many libraries using threading are or were a little naive in that they’d take the core count to be thread count.

The only significant issues I’ve seen is that many libraries using threading are or were a little naive in that they’d take the core count to be thread count. Better libraries know the difference But I’m not aware of any benchmarks that pin one execution thread per physical core and compare with and without hyperthreading. I guess I have some homework to do, but then it’s a lot of effort when the results could depend on generation, clock speed etc.