This is an old revision of the document!
HPC Power
As part of our reevaluation of our data center cooling capacity and overhaul, we need to get a handle on non-emergency power consumption in data center. This will be done by a third party consultant by clamping power cables in the penthouse of Excley. So I bought myself a metered PDU and have been busy plugging entire racks into it one at a time. I then measure “idle” and “peak” amperage consumption. The end picture should reveal how much Kw the HPC consumes of all non-emergency power (that is not on enterprise UPS). And we'll figure out how much Physical Plant spends supporting the HPC. Thanks PP!
- “Idle” means not very busy, most of the time something is happening anyway (ie backups)
- “Peak” means very busy, most queues entirely full.
- Metered Amps * 208V = Watts
- Watts * (24 * 365)/1000 = KwH/Y
- kwH/Y * $0.125 = $/Y (mix cogen and utility, 2013 assumption by Pete of PP)
- Double the $/Y to include cooling costs (Pete of PP assumption)
| HPC | Idle | Peak | Idle | Peak | Idle | Peak | Idle | Peak | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Rack | L6-30P | Amps | Amps | Watts | Watts | KwH/Y | KwH/Y | $/Y | $/Y | Note |
| R4R04 | 3 | 22 | 37 | 4,576 | 7,696 | 40,085 | 67,416 | 5,010 | 8,427 | “sharptail rack” |
| R4R05 | 4 | 17 | 34 | 3,536 | 7,072 | 30,975 | 61,950 | 3,872 | 7,743 | “greentail rack” |
| R4R06 | 2 | 6 | 1,204 | 8,970 | 1,121 | empty | ||||
| R4R07 | 2 | 14 | 34 | 2,912 | 7,072 | 25,509 | 61,950 | 3,189 | 7,744 | “mw128/tinymem” |
| R4R08 | 2 | 4 | 832 | 7,288 | 911 | mostly empty | ||||
| Total | 13 | 63 | 105 | 13,060 | 21,840 | 114,405 | 191,318 | 14,300 | 23,915 | |
In 2013 we found for our Dell Racks purchased in 2006 (full of PE1950 and PE2950 servers) Replace Dell Racks
- 115,000 KwH/Y per rack for power
- 14,375 $/Y per rack for power
So a great improvement in energy efficiency. We probably grew from near 5 teraflops to near 60 teraflops in this time period (double precision, floating point, theoretical).
Metered
R4R04 rack: three L6-30P supplies
- All dual power supply nodes
- n33-n37 one gpu/node, 94/120 cpu jobs = 5 amps
- n33-n37 above with 3 network switches 8 amps
- m33-n37 need to get data all gpus working = 7 amps
- n78 with 0 jobs = 0 amps, all gpus working = 2 amps
- mindstore0 and ringtail = 1 amps
- cottontail and shartptail (no rsyncs) = 1 amps
- cottontail and shartpail (rsyncs) = ?? amps ←– DO
- under modest load 8+2+1+1=12, observed 14 amps on left PDUs (front/back)
- split n78 to right PDU (right side 2 amps plus all single power)
- all storage 50% on UPS in R4R05, minuscule reduction
- All single power supply nodes add to right PDU
- n38-n41 idle load = 3 amps, so 6 amps for all nodes
- n38-n41 full load = 7 amps, so 14 for all nodes
- TOTAL IDLE load (14)+(6+2)= 22 amps
- TOTAL PEAK load (14+7)+(14+2)= 37 amps …37/90 or 41%
R4R05 rack: four L6-30P supplies
- All dual power supplies
- greentail, sanscratch storage, idle = 2 amps
- greentail, 1TB write to sanscratch = 2 amps
- above + 3 switches, petal/swallow/cotton2 tails, hpcmon = 5 amps
- n1-n32 (25 bodes), idle = 5 amps
- gaussian jobs on n1-n32 = 12 amps
- TOTAL IDLE load 2+5= 7 amps x2 = 17 amps
- TOTAL PEAK load 5+12= 17 amps x 2 = 34 amps … 34/120 or 28%
R4R06 rack: two L6-30P supplies
- Mostly empty rack
- AC unit working = 8 amps (120V)
- two switches = 2 amps (208V)
- TOTAL 6 amps
R4R07 rack: two L6-30P supplies
- All single power supplies
- mw128 10 nodes, idle = 4 amps, for all nodes 8 amps
- mw128 10 nodes, peak = 8 amps, for all nodes 16 amps
- 11/28/2018 17 amps observed (with 6/18 nodes at load 36)
- 03/05/2019 23 amps observed (…wengang jobs, mw128 nodes only! 23+16 is a problem)
- two switches = 2 amps
- tinymem 7 nodes, idle = 2 amps, for all nodes 4 amps
- tinymem 7 nodes, peak = 8 amps, for all nodes 16 amps (DOM,no hard disk)
- TOTAL IDLE load 8+2+4= 14 amps
- TOTAL PEAK load 16+2+16= 34 amps …34/60 is 51%
R4R08 rack: two L6-30P supplies
- Mostly empty rack
- All dual power supplies
- ringtail, mindstoresrv1 storage = 2 amps
- two switches = 2 amps
- TOTAL 4 amps