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Top 23 C++ Parallel Projects
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LightGBM
A fast, distributed, high performance gradient boosting (GBT, GBDT, GBRT, GBM or MART) framework based on decision tree algorithms, used for ranking, classification and many other machine learning tasks.
Project mention: 《LightGBM: 一种高效的梯度提升决策树算法》论文（A Highly Efficient Gradient Boosting Decision Tree） | dev.to | 2025-10-15代码：https://github.com/microsoft/LightGBM
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- https://youtu.be/D4Mn_5MdnDc
If you need to scale data access with whatever tool, it might be worth a look. XRootD is most often used with ROOT (https://root.cern), but can be used more generically as well. It powers CERN's EOS distributed filesystem, for example, where CERN stores all physics data from the major experiments at the LHC.
*disclaimer, I'm the release manager for XRootD and work in the storage and data management group at CERN.
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parallel-hashmap
A family of header-only, very fast and memory-friendly hashmap and btree containers.
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thread-pool
BS::thread_pool: a fast, lightweight, modern, and easy-to-use C++17 / C++20 / C++23 thread pool library
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libfork
A bleeding-edge, lock-free, wait-free, continuation-stealing tasking library built on C++20's coroutines
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Project mention: Show HN: Utl:parallel – Work-stealing concurrency library for C++17 | news.ycombinator.com | 2025-08-03
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elbencho
A distributed storage benchmark for file systems, object stores & block devices with support for GPUs
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Project mention: # BioDynamo v2 Brings GPU Acceleration to Large-Scale Cell Simulations | dev.to | 2025-07-02
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ParallelReductionsBenchmark
Thrust, CUB, TBB, AVX2, AVX-512, CUDA, OpenCL, OpenMP, Metal, and Rust - all it takes to sum a lot of numbers fast!
I was asked this a few months back but don’t have the measurements fresh anymore. In general, I think TBB is one of the more thorough and feature-rich parallelism libraries out there. That said, I just found a comparable usage example in my benchmarks, and it doesn’t look like TBB will have the same low-latency profile as Fork Union: https://github.com/ashvardanian/ParallelReductionsBenchmark/...
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ Parallel discussion
C++ Parallel related posts
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Vc: SIMD Vector Classes for C++
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Parsync, a tool for parallel SSH transfers – 7x faster than rsync
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Show HN: Utl:parallel – Work-stealing concurrency library for C++17
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Show HN: Yet another JSON lib (C++17)
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Understanding SIMD: Infinite Complexity of Trivial Problems
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You can use C-Reduce for any language
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Automated Test-Case Reduction
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A note from our sponsor - SaaSHub
www.saashub.com | 5 Jun 2026
Index
What are some of the best open-source Parallel projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | LightGBM | 18,425 |
| 2 | Taskflow | 11,986 |
| 3 | root | 3,217 |
| 4 | parallel-hashmap | 3,186 |
| 5 | thread-pool | 2,997 |
| 6 | moose | 2,256 |
| 7 | HiGHS | 1,645 |
| 8 | Vc | 1,516 |
| 9 | RaftLib | 995 |
| 10 | libfork | 877 |
| 11 | libgrape-lite | 441 |
| 12 | UTL | 334 |
| 13 | YACLib | 293 |
| 14 | elbencho | 269 |
| 15 | rangeless | 201 |
| 16 | rocPRIM | 176 |
| 17 | ips4o | 167 |
| 18 | fast-cma-es | 162 |
| 19 | firebuild | 150 |
| 20 | biodynamo | 133 |
| 21 | ParallelReductionsBenchmark | 118 |
| 22 | charly-vm | 100 |
| 23 | librapidarchive | 86 |
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