Comments (2)
newpavlov
commented on June 3, 2024
Ideally number of blocks should be chosen based on CPU-family. IIRC on older Intel CPUs optimal number of blocks varied from 4 to 6, but #[cfg(target_cpu = "...")] does not currently work, so we would have to rely on runtime detection, which is... not great. If my measurements correct, on Ryzen 2700X ParBlocks=4 significantly reduces performance (~30-40%), so I think such change should be done only after careful benchmarking.
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tarcieri
commented on June 3, 2024
Will leave this at 8 rounds for now. Please leave a comment if you'd like this issue reopened/revisited.
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