C++ has included wonderful implementations of sorting algorithms over the years. Recently, with C++17 support for parallelism, sorting performance has skyrocketed by running on all of the available cores. The number of cores is predicted to grow in double-digit percentage per year, as competition between Intel and AMD heats up, giving these parallel algorithms wil to give us even faster performance.

I put together an open source repo to show how C++ sorting performance scales with the number of CPU cores. A VisualStudio 2019 solution is included, showing off not only the standard C++17 parallel sorting, but also some of my developments. These are parallel Merge Sort, and now LSD Radix Sort. Let’s see how well these perform on my six-core laptop.