Measuring and analyzing the energy use of enterprise computing systems
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Measuring and analyzing the energy use of enterprise computing systems. Xiuming Zhang. System Deployment. Powernet : a hybrid sensor network that monitors the power and utilization of the IT systems in a large academic building Over more than two years 250+individual computing devices

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Measuring and analyzing the energy use of enterprise computing systems

Measuring and analyzing the energy use of enterprise computing systems

Xiuming Zhang


System deployment

SystemDeployment

  • Powernet:a hybrid sensor network that monitors the power and utilization of the IT systems in a large academic building

  • Over more than two years

  • 250+individual computing devices

  • Onepowermeterperdevice


Appliance types measured

Appliance TypesMeasured


Extrapolating to the whole building

ExtrapolatingtotheWholeBuilding


Power share by type

Power Share by Type

  • 4 types: PC, LCD, server, switch


Measuring and analyzing the energy use of enterprise computing systems

PC

  • Binned into 3 categories

    • Laptops

    • Low-end

    • High-end

  • 742 in total

    • 456: description available. The other: assume same distribution.


Measuring and analyzing the energy use of enterprise computing systems

LCD


Measuring and analyzing the energy use of enterprise computing systems

LCD

  • Lower brightness & use dark backgrounds


Server

Server

  • Monitors 32 of the 500 servers

  • Calculated average power: 233 W

  • Estimated total power of 500 servers: 117 kW


Switch

Switch


Switch1

Switch


Pc cpu utilization

PCCPU Utilization

  • 95%ofthecomputershaveautilizationratelowerthan30%


Popular workloads

PopularWorkloads


Network switch utilization

NetworkSwitchUtilization

  • The demand never exceeded 200 Mbps


Network switch utilization1

NetworkSwitchUtilization

  • Highly underutilized

  • Total network demand <1000 Mbps 100% of the time.


Discussions

Discussions


How does the sampling frequency affect what the data reveal

How does the sampling frequency affect what the data reveal?

  • Too small  hide the anomalies


How big is the variance between two instances of same model

How big is the variance between two instances of same model?


Does sampling a few devices provide an accurate average measurement

Does sampling a few devices provide an accurate average measurement?

shows the wide distribution of desktop power


Does sampling a few devices provide an accurate average measurement1

Does sampling a few devices provide an accurate average measurement?

  • Large sample size desired for PC

  • 1,000,000 random samples of size 5, 10, and 20, drawing from 69 machines


Do short term measurements accurately reflect long term power draw

Do short-term measurements accurately reflect long-term power draw?

  • One-month scale yields an acceptable error


Are energy star data representative

Are Energy Star data representative?

  • Energy Star Standard does not consider PCs under load


Measuring and analyzing the energy use of enterprise computing systems

Thanks for the attention!


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