Lecture 2 - Lecture 4: Power Provisioning Prof. Fred Chong...

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Lecture 4: Power Provisioning Prof. Fred Chong 290N Green Computing
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Power Provisioning $10-22 per deployed IT Watt Given 10 year depreciation cycle $1-2.20 per Watt per year Assume $0.07 per kilowatt-hr and PUE 2.0 8766 hours in a year (8766 / 1000) * $0.07 * 2.0 = $1.22724 Up to 2X cost in provisioning eg. 50% full datacenter = 2X provisioning cost
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Power Distribution Revisited
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Measured Load vs Power
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Modeled vs. Measured PDU Power
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Methodology
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Workloads Websearch – high request throughput and large data size Webmail – high I/O Mapreduce – large offline batch jobs
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Websearch Results
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Webmail Results
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Mapreduce Results
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Mixed Load
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Real Datacenter
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Time at Power Level 80 servers 800 servers 8000 servers
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Oversubscription Opportunity 7% for racks (80) 22% for PDUs (800) 28% for clusters (8000) Could have hosted almost 40% more machines
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Power Capping
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Lecture 2 - Lecture 4: Power Provisioning Prof. Fred Chong...

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