Comprehensive C++ Hashmap Benchmarks 2022

1. rustc-hash

   1 6 497 3.7 Rust

   Custom hash algorithm used by rustc (plus hashmap/set aliases): fast, deterministic, not secure

   

   Can you compare https://github.com/rust-lang/rustc-hash? If you need I can provide a C++ port.

2. JetBrains

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3. parallel-hashmap

   2 34 3,037 6.2 C++

   A family of header-only, very fast and memory-friendly hashmap and btree containers.

   

   Thanks a lot for the great benchmark, Martin. Glad you used different hash functions, because I do sacrifice some speed to make sure that the performance of my hash maps doesn't degrade drastically with poor hash functions. Happy to see that my phmap and gtl (the C++20 version) performed well.

4. gtl

   3 5 214 6.6 C++

   Greg's Template Library of useful classes.

   

   Thanks a lot for the great benchmark, Martin. Glad you used different hash functions, because I do sacrifice some speed to make sure that the performance of my hash maps doesn't degrade drastically with poor hash functions. Happy to see that my phmap and gtl (the C++20 version) performed well.

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