pub const SHARDS: usize = 16;Expand description
Number of independently locked shards in a ShardedCountMinSketch.
A concurrency knob: the total counter budget, the per-row collision rate, and
the aging cadence are all held constant across it (see the module docs), so
raising or lowering it moves contention and halving granularity without
moving any admission or eviction decision. The one quantity it does move is
the whole-sketch over-report rate, by SHARDS^(ROWS-1) — negligible at the
shipped sizing, and bounded in the module docs.