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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System deployment
System computing systemsDeployment

  • 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 Types computing systemsMeasured


Extrapolating to the whole building
Extrapolating computing systemstotheWholeBuilding


Power share by type
Power Share by Type computing systems

  • 4 types: PC, LCD, server, switch


PC computing systems

  • Binned into 3 categories

    • Laptops

    • Low-end

    • High-end

  • 742 in total

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


LCD computing systems


LCD computing systems

  • Lower brightness & use dark backgrounds


Server
Server computing systems

  • Monitors 32 of the 500 servers

  • Calculated average power: 233 W

  • Estimated total power of 500 servers: 117 kW


Switch
Switch computing systems


Switch1
Switch computing systems


Pc cpu utilization
PC computing systemsCPU Utilization

  • 95%ofthecomputershaveautilizationratelowerthan30%


Popular workloads
Popular computing systemsWorkloads


Network switch utilization
Network computing systemsSwitchUtilization

  • The demand never exceeded 200 Mbps


Network switch utilization1
Network computing systemsSwitchUtilization

  • Highly underutilized

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


Discussions
Discussions computing systems


How does the sampling frequency affect what the data reveal
How does the computing systemssampling frequency affect what the data reveal?

  • Too small  hide the anomalies



Does sampling a few devices provide an accurate average measurement
Does sampling a few devices provide an accurate computing systemsaverage measurement?

shows the wide distribution of desktop power


Does sampling a few devices provide an accurate average measurement1
Does computing systemssampling 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 computing systems-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? computing systems

  • Energy Star Standard does not consider PCs under load


Thanks for the attention! computing systems


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