Dell PowerEdge R820 - Manual (Page 21)

Performance Analysis of HPC Applications on Several Dell PowerEdge 12 th Generation Servers
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cluster shows slightly better energy efficiency than the other two clusters because of the lower core
count. The metric used here is rating/Watt, which translates to (number of jobs of LU which can be run
during a period of one day)/power consumed in Watts.
Figure 14 shows the energy efficiency of WRF. The PowerEdge M420 cluster has 13 percent better
energy efficiency when compared to the PowerEdge M620 cluster. The performance metric used here is
average time step/Watt. The lower wattage processors and the lower memory configuration attribute
to this improvement in energy efficiency on the PowerEdge M420 cluster.
The PowerEdge R820 is 12 percent less energy efficient when compared to the PowerEdge M620. The
performance of the 128 core PowerEdge R820 cluster is lower than half of the 256 core PowerEdge
M620 cluster’s performance. But the power consumed by the PowerEdge R820 cluster is higher than
half the power taken by the PowerEdge M620 blades. This contributes to the 12 percent drop in energy
efficiency.
WRF performance/Watt Figure 14.
Figure 15 shows the energy efficiency with ANSYS Fluent. The metric used here is rating per watt. The
PowerEdge R820 cluster has ~14 to 16 percent better energy efficiency than the PowerEdge M620
cluster. The performance is approximately half of the PowerEdge M620 cluster but the power
consumption is accordingly lower too because of the lower total core count. The 512 core PowerEdge
M420 cluster has similar energy efficiency compared to the 256 core PowerEdge M620 cluster for the
truck_poly_14m dataset. Interestingly, the PowerEdge M420 cluster is 23 percent more energy efficient
than the PowerEdge M620 cluster for the truck_111m data set.
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