计算流体动力学（computational fluid dynamics ，CFD）是高性能计算重要应用领域之一，其计算涉及大量数据访问．在大规模并行计算情况下，串行I/O的性能与计算能力不匹配，I/O成为性能瓶颈．并行I/O 是解决这一问题的主要途径之一．针对一个真实多区结构网格CFD 并行程序 HOSTA （high‐order simulator for aerodynamics），基于HDF5（hierarchical data format v5）数据存储格式及其并行I/O编程接口，实现了其主要数据的并行I/O．在一套有6个I/O服务器结点的高性能计算机系统上，采用实际C FD算例进行了性能测试．对一个三角翼算例，并行I/O相对于串行I/O的性能加速比达到21．27，最高获得5．81 GBps的I/O吞吐率，并使程序整体性能提高10％以上；对一个网格规模更大的简单翼型算例，并行I/O最高获得了6．72 GBps的I/O吞吐率．%Computational fluid dynamics (CFD ) is one of the most important high performance computing (HPC) areas .CFD applications commonly access large volumes of data .In case of large‐scale CFD parallel computing ,serial I/O performance does not match the computing performance , hence it becomes the performance bottleneck .Parallel I/O is an effective way to solve this problem . HDF5 (hierarchical data format v5) has provided excellent mechanisms to manage scientific data as well as effective ways to implement parallel I/O .High‐order simulator for aerodynamics (HOSTA) is a multi‐zone structured grids CFD application that can solve real world flow problems .This paper implements the parallel I/O method in HOSTA ,based on the HDF5 file format and corresponding parallel I/O application programming interface .Detailed performance evaluation is performed with real CFD simulation cases on a HPC system equipped with 6 I/O service nodes .The results show that our method is both scalable and efficient .For a delta wing test case ,parallel I/O achieves the performance speedup of 21 .27 compared with the serial I/O .It achieves maximal I/O throughput of 5 .81 GBps and improves the application's performance by over 10% ,as compared with the original code .For a simple airfoil test case with larger grid size ,our parallel I/O achieves maximal I/O throughput of 6 .72 GBps .
展开▼
