Bulk Operations in Boost.Bloom
3 days ago
- #Performance Optimization
- #Bulk Operations
- #Boost.Bloom
- Boost.Bloom introduces bulk operations in Boost 1.90 to speed up insertion and lookup by separating position calculation from memory access.
- Bulk-mode insertion prefetches addresses to minimize CPU stalling, improving performance for larger bit arrays.
- Lookup operations for k > 1 are challenging due to branching; bulk-mode reduces iterations using bitmask techniques.
- The bulk version of may_contain reduces conditional branches and superfluous memory fetches, achieving speedups up to 3x.
- Performance gains vary based on filter configuration and size, with some cases showing less performance than non-bulk operations.
- The key technique involves iteration reduction with std::countr_zero, applicable beyond Boost.Bloom for efficient pipelining.