论文标题
辐射传输矩模型模拟的大量平行模板策略
Massively Parallel Stencil Strategies for Radiation Transport Moment Model Simulations
论文作者
论文摘要
辐射传输方程是高维相空间中的介观方程。力矩方法通过传统时空中的部分微分方程系统近似它。一个挑战是，由于每个空间网格点中的较大矢量大小（1600个组件）引起的高计算强度。在这项工作中，我们通过在大规模并行HPC框架NASTJA中实现Starmap方法来大大扩展3D模拟中的可计算域大小，该方法旨在有效地使用当前的超级计算机。我们应用多种优化技术，包括新的内存布局和显式SIMD矢量化。我们展示了具有2000亿个自由度的模拟，并争论如何在许多科学领域扩展和使用实现。
The radiation transport equation is a mesoscopic equation in high dimensional phase space. Moment methods approximate it via a system of partial differential equations in traditional space-time. One challenge is the high computational intensity due to large vector sizes (1600 components for P39) in each spatial grid point. In this work, we extend the calculable domain size in 3D simulations considerably, by implementing the StaRMAP methodology within the massively parallel HPC framework NAStJA, which is designed to use current supercomputers efficiently. We apply several optimization techniques, including a new memory layout and explicit SIMD vectorization. We showcase a simulation with 200 billion degrees of freedom, and argue how the implementations can be extended and used in many scientific domains.
