1 research outputs found
Implicit Low-Order Unstructured Finite-Element Multiple Simulation Enhanced by Dense Computation using OpenACC
In this paper, we develop a low-order three-dimensional finite-element solver
for fast multiple-case crust deformation analysis on GPU-based systems. Based
on a high-performance solver designed for massively parallel CPU based systems,
we modify the algorithm to reduce random data access, and then insert OpenACC
directives. The developed solver on ten Reedbush-H nodes (20 P100 GPUs)
attained speedup of 14.2 times from 20 K computer nodes, which is high
considering the peak memory bandwidth ratio of 11.4 between the two systems. On
the newest Volta generation V100 GPUs, the solver attained a further 2.45 times
speedup from P100 GPUs. As a demonstrative example, we computed 368 cases of
crustal deformation analyses of northeast Japan with 400 million degrees of
freedom. The total procedure of algorithm modification and porting
implementation took only two weeks; we can see that high performance
improvement was achieved with low development cost. With the developed solver,
we can expect improvement in reliability of crust-deformation analyses by
many-case analyses on a wide range of GPU-based systems.Comment: 18 pages, 10 figures, accepted for WACCPD201