Tony Finch bc2389b828 Add per-thread sharded histograms for heavy loads ...

Although an `isc_histo_t` is thread-safe, it can suffer
from cache contention under heavy load. To avoid this,
an `isc_histomulti_t` contains a histogram per thread,
so updates are local and low-contention.

2023-04-03 12:08:05 +01:00

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