On Monday (05/30/2011 at 08:27AM -0700), Chuck Guzis wrote:
Going through the effort of designing an building a mainframe-style
supercomputer such as a Cray 3 would be folly today. Witness Steve
Chen's "box full of Pentiums" as how badly this sort of thing can go.
So, there are some people who still want such things-- and some people
who will still build them.
I know a thing or two about this system,
http://www.nas.nasa.gov/hecc/resources/pleiades.html
as I did the architecture for the first version rolled out in 2007--
at 487 TFlop in 100 racks. They've since scaled out to 168 racks,
adding higher-end CPUs and can now cross the 1.0 PFlop line with LINPACK.
I'm no longer with SGI but this product line continues and has been
updated to QDR Infiniband, 10 GbE and other enhancements to the
interconnect.
I can assure you that the performance of the interconnect is still the
bottleneck ;-) which is one reason why we put two parallel IB fabrics
into this thing.
A node in this machine is pretty much a standard Intel Xeon based server
without any disks or power supply. It's built on a slightly different
PCB form-factor but is otherwise a standard reference design for such
a platform. The whole point was to leverage that commodity stuff so
that you could A LOT of it together and scale it out at lower cost than
totally proprietary stuff.
Chris
--
Chris Elmquist