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Split test=Speed into SpeedBulk and SpeedSmall and report weighted average for Small key speed test #293

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Split test=Speed into SpeedBulk and SpeedSmall and report weighted average for Small key speed test #293

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Commits on Aug 30, 2024

  1. Split Speed into SpeedBulk and SpeedSmall, add ENV{SMHASHER_SMALLKEY_… 

    …MAX}

It adds SMHASHER_SMALLKEY_MAX environment variable to override default
value of the longest "Small key" for hash and changes default value from
31 to 32 to make the Average a bit more fair to the hashes reading the
memory word-by-word (dword, qword) and not byte-by-byte.

SMHASHER_SMALLKEY_MIN is also added as a counterpart to benchmark hashes
when the range of small key lengths is known.
    @darkk
    darkk committed Aug 30, 2024
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  2. Add weighted average to SpeedSmall test output 

    It addresses the question at rurban#113

What is the "real" average cycles/hash value for a given hash function?

We can't know, but we can estimate it better if we assume that the
function timing does not depend on input (that's not true for hashes
based on multiplication) and we know distribution of key length in
advance (that might be somewhat known for certain classes of inputs,
but the distribution varies across classes measurably).
    @darkk
    darkk committed Aug 30, 2024
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