CppCon 2017: Matt Kulukundis “Designing a Fast, Efficient, Cache-friendly Hash Table, Step by Step”

— — Hash tables consume a large volume of both compute resources and memory across Google&production system. The design for hash tables in C++ traces its origins to the SGI STL implementation from 20 years ago. Over these years, computer architecture and performance has changed dramatically and we need to evolve this fundamental data structure to follow those changes. This talk describes the process of design and optimization that starts with std::unordered_map and ends with a new design we call "SwissTable", a 2-level N-way associative hash table. Our implementation of this new design gets 2-3x better performance with significant memory reductions (compared to unordered_map) and is being broadly deployed across Google. — Matt Kulukundis: Google, Senior Software Engineer Matt is a senior software engineer on the C++ libraries team at Google. Prior to Google he has worked on compilers, machine learning, and underwater robotics. In his free time, he scuba dives in warm places. — *-----* *-----*