Dell PowerEdge 1655MC - Manual (Page 20)

Optimal BIOS settings for HPC with Dell PowerEdge 12 th generation servers
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energy efficiency of Turbo Boost disabled will be better than with Turbo Boost enabled. The text
within the bar quantifies the decrease in performance (-Perf) and power savings (+Power saving)
with Turbo disabled when compared to Turbo enabled. Results are charted for both the DAPC and
the Performance CPU Power Management Profiles.
Figure 6 shows that energy efficiencies are uniformly better with Turbo Boost disabled. The
increase in energy efficiency ranges from 9% to 20% when compared to Turbo Boost enabled. This is
better understood by examining the text details in the graph. For example, consider the case of
WRF with the Perf profile. From the graph the results show that for this application Turbo disabled
provides 12% better energy efficiency. This is because the decrease in performance when Turbo is
disabled is only 9% but the corresponding power savings are 23% when compared to Turbo enabled.
Since the power saving is significantly more than the loss in performance, the resultant energy
efficiency favors Turbo off.
The results in this section indicate that energy efficiency-sensitive clusters should disable Turbo
Boost. It can be enabled in those cases where pure performance is the goal.
5.4. Node Interleaving
This section examines the impact of the Node Interleaving option on cluster-level application
performance. As described in Section 3.3, the Node Interleaving BIOS option stripes memory across
both memory controllers making the memory access uniform to all processor cores.
Figure 7. Performance and Energy Efficiency of Node Interleaving
* Data collected on a 16-server PowerEdge M620 cluster. Dual Intel Xeon E5-2680 @ 2.7GHz, 8*8GB 1600MT/s
memory per server. Mellanox InfiniBand FDR. Logical Processor disabled. DAPC System Profile.
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