[][src]Crate bloom2

bloom2 implements a 2-level bloom filter to provide sparse, lazily initialised, high performance bloom filters with reduced memory footprints.

The memory usage of a sparse bloom filter grows proportionally with the load factor of the filter, resulting in substantially smaller memory footprints for filters with average, or low load factors. As bloom filters are typically sized to avoid high load factors in order to minimise false positives, this is highly effective for the typical use case.

The CompressedBitmap filter provides amortised O(1) insert, and O(1) lookup with similar average case latency compared to a normal bloom filter (~10ns on a Core i7 @ 2.60GHz).


  • serde - enable serialisation with serde, disabled by default



CompressedBitmap implements a sparse, 2 level bloom filter - a space efficient, probabilistic set.



FilterSize bounds the allocated size of a CompressedBitmap.