[Beowulf] 512 nodes Myrinet cluster Challanges

[Mark Hahn]

> Heh... Load up a Sun v20z with a CPU pounding calculation, and as the 
> CPUs heat up, they wind the fans up.  I had several parallel GAMESS runs 

yes, I actually have no problem with thermostatically-controlled fans.
in my case, the control algorithm appears to need some work, though,
since it's common to find fairly cool air jetting out of our racks.

> going and it reminded me of a turbo pump winding up ....  Its neat to 
> probe the hardware status and see the fans wind up from 4-5000 RPM 
> through 12kRPM ...

12K is moderate - these, at least according to IPMI, go up to 16.8K ;)