Vectorizing Computational Fluid Dynamics (CFD) Code in C++ Using std::simd - Olaf Krzikalla - CppCon смотреть онлайн

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Vectorizing a Computational Fluid Dynamics (CFD) Code in C++ Using std::simd Supplemented by (Almost) Transparent Loading and Storing - Olaf Krzikalla - CppCon 2024
Slides: https://github.com/CppCon/CppCon2024/blob/main/Presentations/Vectorizing_a_CFD_Code_With_stdsimd.pdf
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Computational Fluid Dynamics (CFD) codes are ubiquitous in high performance computing. Their computational demands require the use of all levels of parallelism provided by the hardware. This includes the SIMD units of today's processors, which provide one level of data parallelism. With `std::simd`, it becomes possible to address these units directly from C++.

The talk reports on our work on the vectorization of a CFD code. The focus will be primarily on the way we have expressed vectorization using `std::experimental::simd` and less on the achieved performance gains. In this context, we have developed a library that complements `std::simd`. The goal of this library is to make loading and saving `std::simd` variables syntactically equivalent to loading and saving their scalar counterparts. Loop bodies written for scalar variables can then be used for `std::simd` variables without modification. The talk also discusses some possible improvements to C++, since this goal can currently only be achieved by using a macro.

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Olaf Krzikalla

Olaf Krzikalla started using C++ as a student at the Technical University of Dresden in the mid-90s. After that he worked as a software developer for several companies. During this time he also contributed the first version of `boost::intrusive`. In 2009 Olaf joined the HPC Center of the TU Dresden and developed the vectorizing source-to-source compiler Scout. His PhD in computer science, also in Dresden, was on memory access analysis in distributed systems. Since 2017 Olaf works at the German Aerospace Center (DLR), where he can apply the results of his university work to the various CFD codes developed by the DLR.

https://www.youtube.com/watch?v=r7T6JifMBkU