Appendix a – summary of findings, Idle power, System profile – Dell PowerEdge 1655MC User Manual
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Optimal BIOS settings for HPC with Dell PowerEdge 12
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Appendix A – Summary of findings
This section summarizes results from this white paper.
For readability,
The Performance Per Watt Optimized (DAPC) System Profile is abbreviated to DAPC.
The Performance Per Watt Optimized (OS) System Profile is abbreviated to OS Control.
The Performance Optimized System Profile is abbreviated to Perf.
Idle power
1) Idle power consumption of DAPC and OS Control System Profiles is about the same. Perf System
Profile consumes 19% more power. Dense profile consumed 3% less power.
Reference Figure 3 - Idle power usage across different System Profiles
2) Idle power consumption is 72% to 104% more when power saving options like C States, C1E, and
Monitor/Mwait are disabled when compared to these options enabled. The biggest factor appears
to be Monitor/Mwait since C States and C1E contribute to only 17-19% more power consumption
when disabled.
Reference Figure 4 - Impact of power-based BIOS options on idle power
System Profile
3) For all applications, the performance results with the DAPC and OS Control System Profiles are
within 4% of each other.
The energy efficiency of the two profiles is within 6% of each other for all applications except
MILC. The OS Control profile is 14% less energy efficient than DAPC for MILC.
Reference Figure 5 - Performance and Energy Efficiency of System Profiles on applications
4) The Perf System Profile helps MILC performance by ~21% and NAMD performance by ~7% when
compared to the DAPC System Profile. For the other applications, performance is within 2%
The energy efficiency of the Perf System Profile is 5% lower than DAPC for LU, and 8% lower than
DAPC for NAMD. For all other applications, the energy efficiency is within 2% of DAPC.
Reference Figure 5 - Performance and Energy Efficiency of System Profiles on applications
5) The Dense System Profile reduces application performance by 8% to 35% when compared to the
DAPC profile. The energy efficiency of the Dense System Profile is -18% to +8% depending on the
application.
Reference Figure 5 - Performance and Energy Efficiency of System Profiles on applications