期刊
HYDROLOGICAL RESEARCH LETTERS
卷 9, 期 4, 页码 61-68出版社
NAKANISHI PRINTING CO, LTD
DOI: 10.3178/hrl.9.61
关键词
K supercomputer, large-scale/high-resolution; flood inundation simulation; Yodo River; MPI; OpenMP
资金
- RIKEN Advanced Institute for Computational Science through the HPCI System Research Project [hp140220]
This paper reports the implementation of high-performance computing using the K supercomputer in Kobe, Japan, for large-scale/high-resolution flood simulation. Supercomputer K was developed in 2012 by RIKEN and Fujitsu and ranked first in the list of Top 500 supercomputer sites in 2011 during its development stage. A two-dimensional inundation simulation model developed based on a shallow water equation using an existing numerical scheme was parallelized with the K supercomputer. Osaka and other cities along the Yodo River were chosen as application sites and the area discretized by 12824442 (= 3453 x 3714) nodes with a resolution of 10 m. The computational time for the five-hour flood simulation was measured by changing the number of 8-core CPUs of the K supercomputer. As a result, computational time was decreased to 9.3 min by using 128 x 64 = 8192 8-core CPUs. The computational time was 1423.7 min for one 8-core CPU. Thus, the simulation speed increased by a factor of 153.2 with the use of the K supercomputer.
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