Optimizing Hash Table Lookup Performance with SIMD Techniques in C#
By
axeluser
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Summary
The article details a performance optimization technique for a Cuckoo Filter implementation in C#, where the author leverages the similarity between four bytes in a hash table bucket and an integer to achieve a 2x performance boost. The approach involves bit-twiddling and rethinking the layout of the hash table.
Key quotes
· 4 pulledWhile working on a Cuckoo Filter implementation in C#, I created an array-like structure for the underlying hash table.
The layout looked straightforward—just a byte array where the start of each bucket is calculated as bucketIdx * bucketSize.
They feel like … an integer! I wasn’t chasing
It started with a simple thought: four bytes in a hash table bucket look just like an integer. Luckily, this one idea led to a deep dive into bit-twiddling and a 2x performance boost.
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