libcuckoo
junction
| libcuckoo | junction | |
|---|---|---|
| 4 | 1 | |
| 1,538 | 1,365 | |
| 1.0% | - | |
| 3.5 | 0.0 | |
| 25 days ago | over 3 years ago | |
| C++ | C++ | |
| GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
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libcuckoo
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Cuckoo Hashing Library with variable hash functions and buckets
https://github.com/efficient/libcuckoo - I'm not so sure about this one as I'm not too familiar with C++
- Libcuckoo: A high-performance concurrent hash table
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Experiences with Concurrent Hash Map Libraries
In the case of libcuckoo a lock is obtained for iterating the elements. See here. This is done infrequently to prevent performance impact.
junction
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Experiences with Concurrent Hash Map Libraries
junction has a very impressive performance benchmark here. Initially it worked for my application, but I ran into some issues: Only raw pointers are supported as either keys or values. This means I am responsible for memory management and it was a pain. junction's required dependency "turf" causes linker errors when compiling with -fsanitize=address because there are symbol name collisions. Every thread that accesses the hash map must periodically call an update function or memory will be leaked. No commits in over three years, GitHub issues aren't getting any attention. The author said it's experimental and he doesn't want it to become more popular
What are some alternatives?
parallel-hashmap - A family of header-only, very fast and memory-friendly hashmap and btree containers.
moodycamel - A fast multi-producer, multi-consumer lock-free concurrent queue for C++11
FASTER - Fast persistent recoverable log and key-value store + cache, in C# and C++.
libcds - A C++ library of Concurrent Data Structures
Folly - An open-source C++ library developed and used at Facebook.
HPX - The C++ Standard Library for Parallelism and Concurrency
Kuku - Kuku is a compact and convenient cuckoo hashing library written in C++.
Thrust - [ARCHIVED] The C++ parallel algorithms library. See https://github.com/NVIDIA/cccl
moderngpu - Patterns and behaviors for GPU computing
alpaka - The project alpaka has moved to https://github.com/alpaka-group/alpaka
VexCL - VexCL is a C++ vector expression template library for OpenCL/CUDA/OpenMP