All, Not a expert, but I know a thing or two. The triblade is two CB2 blades which each hold each two PowerXCell processors in a cc-NUMA arrangement. They sandwch a LS21 blade that is connected to each through a 16x PCIe to HT bridge. These three are uni-body constructed. The CB2s resemble the QS22 blade that goes into the IBM BladCenter H chassis. They are vertical full-height blades which fit 14 to an enclosure. The RoadRunner triblade is at least double-wide and maybe more. Do not know the measurements.
The photo confuses me though, because am pretty sure these are vertically racked. Another thing to note is that programming the triblade is tri-binary ... x86, Power, and SPE. MPI processes are doled out to the Opteron blade. The PowerXCells are programmed beneath MPI as SIMD accelrators. The systems processing power is largely resident in the PowerXCell (~200 peak Gflops per CB2), the Opteron only accounts for about 44 teraflops of the total peak performance with is in the vicinity of 1400 teraflops. Linpack runs at about 85% efficient on the system and is running on the SPE only I am pretty sure. Running Linpack it generates 650 Mflops per watt making it pretty Green I guess ... which is what you would expect from a DLP engine. As I recall Blue Gene is about 350 Mflops per watt. But the 650 number maybe does not count the LS21 power consumption. Anyway ... Hope that was useful ... now, can someone tell about the IEEE-754-ness of its eDP units? rbw -- "Making predictions is hard, especially about the future." Niels Bohr -- Richard Walsh Thrashing River Consulting-- 5605 Alameda St. Shoreview, MN 55126 Phone #: 612-382-4620 -------------- Original message -------------- From: "Peter St. John" <[EMAIL PROTECTED]> Bernard, I'm looking forward to hearing from our resident experts, but meanwhile: http://en.wikipedia.org/wiki/IBM_Roadrunner exlains the architecture some. The buzzword is "triblade", which is 3 blades (with an extension) employing two types of processors (AMD Opteron and IBM Cell) in a hybrid subsystem. I have no idea what a single Triblade looks like. The overallmachine is then composed of zillions of triblades. Wow,imagine a Beowulf of those (jk :-) Peter (designing a Beowulf of abaci to fit his current budget) On Thu, Jun 12, 2008 at 3:45 PM, Bernard Li <[EMAIL PROTECTED]> wrote: Hi all: I am sure most people have seen the following picture for Roadrunner circulating the Net: http://www.cnn.com/2008/TECH/06/09/fastest.computer.ap/index.html?iref=newssearch However, they don't look likes blades to me, more like 2U IBM x series servers. Perhaps those are the I/O nodes? Cheers, Bernard _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
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