[Beowulf] bring back 2012?

Prentice Bisbal pbisbal at pppl.gov
Tue Aug 23 06:58:57 PDT 2016

How much power does that system use at full-tilt? I'm guessing about 
2250 - 2500 kW.


On 08/22/2016 07:40 PM, Stu Midgley wrote:
> I measured the power draw of our 2RU 8 phi nodes with and without 
> fans... the fans draw about 20% power.
> On a 2200kW node that's considerable.
> On Tue, Aug 23, 2016 at 5:36 AM, Mark Hahn <hahn at mcmaster.ca 
> <mailto:hahn at mcmaster.ca>> wrote:
>         Extra, the direct contact cooling stuff must still have the
>         fans in the
>         nodes to keep the dimms/disks/power supplies cool... thus use
>         considerably
>         more power than nodes without fans.
>     why do you say "considerably"?  1u muffin fans are annoying and
>     not that efficient, but even 1U could still use blowers.  and it's
>     not as if
>     you need a lot of airflow to keep 5-20W of support hardware cool.
>     (that would be for non-extreme numbers of disks/dimms/nics -
>     though it occurs to me that motherboards also have some power
>     regulation in them,
>     and if 2 sockets are drawing 250w, then 90% efficient regulation
>     would still mean 28W extra heat to dissipate.)
>     iirc a typical 1U fan dissipates up to ~3W, but that's only when
>     running full on (screaming 14krpm...).  not to mention the wide
>     availability of simple 4-system-in-2u chassis (more efficient fans).
> -- 
> Dr Stuart Midgley
> sdm900 at sdm900.com <mailto:sdm900 at sdm900.com>
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