Blazing Fast AVX-512 Sorting Library by Intel, 10~17x Faster Sorts in NumPy

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  • highway

    Performance-portable, length-agnostic SIMD with runtime dispatch

    sagarm has posted one result in another thread. I'll also look into adding their code to our benchmark :)

    It's great to see more vector code, but caveat for anyone using this: the pivot sampling is quite basic, just median of 16 evenly spaced samples. This is will perform poorly on skewed distributions including all-equal and very few unique values. Yes, in the worst case it can resort to std::sort but that's a >10x speed hit and until recently also potentially O(N^2)!.

    We have drawn larger samples (nine vectors, not one), and subsequently extended the vqsort algorithm beyond what is described in our paper, e.g. special handling for 1..3 unique keys, see

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