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40 Dell HPC System for Manufacturing—System Architecture and Application Performance
4.6.1 Car2Car
The car2car benchmark is a simulation of a two vehicle collision. This benchmark model contains 2.4
million elements, which is relatively small compared to current automotive industry usage. Figure 35
shows the measured performance of the reference system for the car2car benchmark, on one to eight
EBBs, using 32 to 256 cores. Each data point on the graph records the performance using the number of
cores marked on the horizontal axis in a parallel simulation.
Figure 36 presents the same performance data plotted relative to the “32-cores (1 Node)” result. This
makes it easy to see the scaling of the solution—the performance improvement when more cores are
used for the analysis. Problem scalability for LS-DYNA depends on the number of elements and other
features being simulated in the problem such as contact or airbags. The Car2Car benchmark is a relatively
small problem, but scaling is reasonable up to 256 cores or eight nodes.
This problem was run using both Intel MPI and Platform MPI. The performance obtained from the two MPI
implementations was nearly identical.
Figure 35 LSTC LS-DYNA Car2Car Performance—Explicit BB
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
32(1) 64(2) 128(4) 192(6) 256(8)
ElapsedTime(lowerisbetter)
NumberofCores(NumberofNodes)
LSTCLS‐DYNACar2CarPerformance—ExplicitBB
R8.1AVX2IntelMPI5.1.2.150 R8.1AVX2PlatformMPI9.1.0.1