非構造格子Euler/Navier.Stokes ソルバJTAS の計算性能最適化

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A scalar version of the three.dimensional hybrid.unstructured.grid finite.volume method Euler/Navier.Stokes solver JTAS (JAXA Tohoku.university Aerodynamic Simulation code) is developed to improve the scalar computing performance by optimizing the memory access pattern because the original JTAS code was developed for a vector system. The efficiency of this optimization is confirmed on a large scale SMP cluster system consisting of Fujitsu PRIMPOWERHPC2500. The speedup ratio is more than 1.8 from the performance measurement with practical data. In addition, a thread parallel version of JTAS is also developed to confirm the possibility of the unstructured grid CFD solver. The thread parallel execution of the JTAS original version can be done naturally. But, under the 2 processes and 8 threads hybrid execution condition,the thread parallel speedup ratio is only about 5, which is less than 70% of the theoretical speedup for the time.integration part. Generally speaking, a scalar version with some recursivereferences cannot be efficiently executed by the thread parallel. Thus, a thread version without recursive references is developed to get a higher performance under the thread parallel execution.The thread parallel acceleration ratio for the time.integration part of this version is abut 6.2,which is more than 70% of the theoretical speedup. Then, the efficiency of thread parallel optimization is confirmed. However, total elapsed time is longer than a scalar version under execution used same number of CPUs, and only 1.5 times of performance gain as compared with a JTAS original version and this. Through the study, the understanding to the features of the unstructured flow solver like JTAS is deepened and the coding strategy for the performance speedup toJTAS is obtained.
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非構造格子Euler/Navier.Stokes ソルバJTAS の計算性能最適化

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