[Beowulf] modular motherboard prototype

Gerry Creager gerry.creager at tamu.edu
Fri Aug 21 16:28:37 EDT 2009


Greg Lindahl wrote:
> On Fri, Aug 21, 2009 at 12:04:09PM -0700, Lux, Jim (337C) wrote:
> 
>> We can guess, though.. It's an ARM running at 72 MHz, for which they
>> claim 64 Dhrystone MIPS. Some of those are going to be burned in
>> interprocess communication. The LPC2368 (which is what they use)
>> datasheet says it draws 125mA at 3.3V running at 72MHz. (I'm pretty
>> sure that doesn't include power to drive I/O pins, which is
>> separately supplied).  That's about half a watt.  So they're getting
>> about 128 DMIPS/Watt
> 
> In comparison, a Sheevaplug is $100, 1.2 Ghz ARM, 15 watts max for the
> whole thing, and you can use gigE networking and program it with MPI.
> I suppose it depends on how weird you like your hobbies to be :-)


For Jim's projects to work, however, he's gotta also have the spacecraft 
fly information to keep the PowerSquid in formation, so the SheevaPlugs 
can all get power.  Then there's the real long extension cord back to 
those AC-procuding solar cells....
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