ParallelAlgorithms
High Performance C++ Algorithms: parallel and sequential. Working VisualStudio 2019 solution is included with all supporting code and usage examples.
- Parallel Merge for merging two arrays of any data type supporting comparison. Described in blog https://duvanenko.tech.blog/2018/01/14/parallel-merge/
- Parallel Merge Sort for sorting arrays of any data type supporting comparison. Described in blog https://duvanenko.tech.blog/2018/01/13/parallel-merge-sort/
- Parallel Sort from Standard C++17. Described in blog https://blogs.msdn.microsoft.com/vcblog/2018/09/11/using-c17-parallel-algorithms-for-better-performance/
- LSD Radix Sort for arrays of unsigned long's. Described in blog https://blogs.msdn.microsoft.com/vcblog/2018/09/11/using-c17-parallel-algorithms-for-better-performance/
Benchmark Results of the following C++17 algorithms on Ubuntu 20.04 using g++, sorting an array of 10 Million unsigned integers:
- single core:
sort(sorted.begin(), sorted.end()) - multi-core:
sort(std::execution::par_unseq, sorted.begin(), sorted.end())
| Algorithm | Random | Presorted | Description |
|---|---|---|---|
| sort single core | 14 | 72 | 48-core Intel Xeon, with hyperthreading (96 vCPUs) |
| sort multi-core | 73 | 175 | 6-core Intel i7-9750H, with hyperthreading |
| sort multi-core | 625 | 1,333 | 48-core Intel Xeon, with hyperthreading (96 vCPUs) |
the units in the table above are Millions of unsigned integers per second.
Sorting an array of unsigned long integers:
| Algorithm | Random | Presorted | Description |
|---|---|---|---|
| sort single core | 14 | 16 | 48-core Intel Xeon, with hyperthreading (96 vCPUs) |
| sort multi-core | 71 | 6-core Intel i7-9750H, with hyperthreading | |
| sort multi-core | 401 | 513 | 48-core Intel Xeon, with hyperthreading (96 vCPUs) |
| Algorithm | Random | Presorted | Constant | Description |
|---|---|---|---|---|
| LSD Radix Sort multi-core | 153 | 140 | 121 | 6-core Intel i7-9750H, with hyperthreading |
Building on Ubuntu 20.04 Linux
To install g++ which supports C++17:
sudo apt install build-essential
To update gcc to support c++17 standard:
sudo apt update
sudo apt install libtbb-dev
To build, use g++ command and not gcc. The order of the following arguments matters!
g++ ParallelAlgorithms.cpp ParallelMergeSortBenchmark.cpp RadixSortLsdBenchmark.cpp ParallelStdCppExample.cpp -ltbb -std=c++17 -O3 -o ParallelAlgorithms
