thread-pool
A simple, functional thread pool implementation using pure C++20.
Features
- Built entirely with C++20
- Enqueue tasks with or without tracking results
Integration
dp::thread-pool is a header only library. All the files needed are in include/thread_pool.
CMake
ThreadPool defines two CMake targets:
ThreadPool::ThreadPooldp::thread-pool
You can then use find_package():
find_package(dp::thread-pool REQUIRED)
Alternatively, you can use something like CPM which is based on CMake's Fetch_Content module.
CPMAddPackage(
NAME thread-pool
GITHUB_REPOSITORY DeveloperPaul123/thread-pool
GIT_TAG #0cea9c12fb30cb677696c0dce6228594ce26171a change this to latest commit or release tag
)
Usage
Simple example:
// create a thread pool with a specified number of threads.
dp::thread_pool pool(4);
// add tasks, in this case without caring about results of individual tasks
pool.enqueue_detach([](int value) { /*...your task...*/ }, 34);
pool.enqueue_detach([](int value) { /*...your task...*/ }, 37);
pool.enqueue_detach([](int value) { /*...your task...*/ }, 38);
// and so on..
You can see other examples in the /examples folder.
Benchmarks
See the ./benchmark folder for the benchmark code. The benchmarks are set up to compare matrix multiplication using the dp::thread_pool versus std::async. A summary of the comparisons is below. Benchmarks were run using the windows-release CMake preset (see CMakePresets.json).
Machine Specs
- AMD Ryzen 7 1800X (16 X 3593 MHz CPUs)
- CPU Caches:
- L1 Data 32 KiB (x8)
- L1 Instruction 64 KiB (x8)
- L2 Unified 512 KiB (x8)
- L3 Unified 8192 KiB (x2)
- 32 GB RAM
Summary of Results
Matrix sizes are all square (MxM). Each multiplication is (MxM) * (MxM) where * refers to a matrix multiplication operation.
| Matrix Size | Number of multiplications | std::async time (ms) |
dp::thread_pool time (ms) |
|---|---|---|---|
| 8 | 25,000 | 77.9 | 198 |
| 64 | 5,000 | 100 | 84.9 |
| 256 | 250 | 295 | 59.0 |
| 512 | 75 | 713 | 69.3 |
| 1024 | 10 | 1160 | 73.8 |
Building
This project has been built with:
- Visual Studio 2022
- Clang
10.+(via WSL on Windows) - GCC
11.+(vis WSL on Windows) - CMake
3.21+
To build, run:
cmake -S . -B build
cmake --build build
Build Options
| Option | Description | Default |
|---|---|---|
TP_BUILD_TESTS |
Turn on to build unit tests. Required for formatting build targets. | ON |
TP_BUILD_EXAMPLES |
Turn on to build examples | ON |
Run clang-format
Use the following commands from the project's root directory to check and fix C++ and CMake source style. This requires clang-format, cmake-format and pyyaml to be installed on the current system. To use this feature you must turn on TP_BUILD_TESTS.
# view changes
cmake --build build/test --target format
# apply changes
cmake --build build/test --target fix-format
See Format.cmake for details.
Build the documentation
The documentation is automatically built and published whenever a GitHub Release is created. To manually build documentation, call the following command.
cmake -S documentation -B build/doc
cmake --build build/doc --target GenerateDocs
# view the docs
open build/doc/doxygen/html/index.html
To build the documentation locally, you will need Doxygen and Graphviz on your system.
Contributing
Contributions are very welcome. Please see contribution guidelines for more info.
License
The project is licensed under the MIT license. See LICENSE for more details.
Author
 @DeveloperPaul123 |
|---|
