Cluster installation

Jim Lux James.P.Lux at
Thu Jun 19 16:14:59 EDT 2003

Simple.. all the electrical power is converted to heat. 1 unit @338W and 10 
units at 295W gives you, to a first order, 2950+338 = 3288 Watts...  So, in 
energy terms, that's 3.3 kJ/second.

You can convert kJ to calories, BTU, tons of ice, etc.

A comment: 295 and 338 appear to be overly precise numbers. I would venture 
to guess that the instantaneous power consumption of a PC varies somewhat, 
depending on instruction stream (fine scale) and environmental effects 
(line voltage, air temperature, etc.)  You might just assume 350W per node 
and be done with it...

Nit picky note: indeed, the information coming out of the cluster is 
somewhat more organized (i.e. lower entropy) than the information going in, 
and there is some small, but non-zero, amount of energy required to reduce 
the information entropy.  Then again, one can also use the energy to 
randomize the data.

At 09:16 AM 6/19/2003 -0700, you wrote:
>Hi everybody,
>We need to know the heat generated (that is, how much
>cooling is needed) by a beowulf cluster of 11 units.
>Each unit has 2 Pentium 4 processors.  The master node
>has a power consumption of 338 W and each slave node
>295 W.
>Where can I get this information?
>             Gustavo

James Lux, P.E.
Spacecraft Telecommunications Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875

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