ACCELERATED MULTI GPU TSUNAMI RUN-UP SIMULATION

Accelerated multi GPU Tsunami run-up simulation was realized at the wide area (whole Toyama-bay in Japan) by faster computation technique. To achieve the simulation, a high resolution calculation is required for the running-up Tsunami simulation because artificial structures on the ground such as roads, buildings, and houses are very small. On the other hand the huge area simulation is also required. In the Toyama-bay case the area is 42[km] x 15[km]. When 5[m] x 5[m] size computational cells are used for the simulation, over 26,000,000 computational cells are generated. To achieve the simulation, multi GPGPU system (NVIDIA TESLA K20x, InfiniBand, MVAPICH) was used for the calculation. As a result 5.16 times faster calculation was achieved on six GPUs than one GPU case and it was 86% parallel efficiency to the linear speed up.