[Beowulf] bring back 2012?
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
> 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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