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(I would have applied a benchmarking tag, but it seems there isn’t one).

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    The title is far too uninteresting for something that goes this deep into the problem!

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      Nice post. Measuring the number of hashtable lookups is a sort of small version of Brendan Gregg’s notion of “Active Benchmarking”, which I’ve gone ahead and submitted: https://lobste.rs/s/rqk9hm/active_benchmarking.