How Can I Leverage C 17 Parallel Algorithms for Performance Gains?

Are C 17 Parallel Algorithms Already Implemented?

In C 17, parallel algorithms were introduced but faced implementation challenges. As of today, these algorithms have been realized in GCC 9. However, to use them, you must independently install Thread Building Blocks (TBB).

Implementation Details

Ubuntu 19.10:

• GCC 9 and TBB 2019 are readily available.
• Installation: sudo apt install gcc libtbb-dev

Ubuntu 18.04:

• GCC 9 can be acquired from a PPA.
• TBB must be manually compiled as the existing version is incompatible.
• For automated installation steps, refer to the provided commands in the answer.

Usage:

<code class="cpp">#include <execution>
#include <algorithm>

std::sort(std::execution::par_unseq, input.begin(), input.end());</code>

Performance

Benchmarks using a sorting program demonstrate significant speedups with parallel algorithms, achieving a 4.5x improvement in one example. Performance may vary depending on system specifications.

Troubleshooting Common Errors

• Missing TBB: tbb/blocked_range.h not found.
• Outdated TBB: Requires TBB version 2018 or later.

The above is the detailed content of How Can I Leverage C 17 Parallel Algorithms for Performance Gains?. For more information, please follow other related articles on the PHP Chinese website!