[Beowulf] What is the status of "remote prefetching" in QPI?

richard.walsh at comcast.net richard.walsh at comcast.net
Fri Feb 20 18:50:10 EST 2009



All, 



In early descriptions of QPI, this capability (a remote QPI agent's [on say an FPGA or GPU 

accelerator] ability to stimulate a QPI processor to prefetch data to its cache, avoiding memory), 

was listed as a possible feature of QPI.  This has obvious potential benefits in globalizing 

distributed memory and reducing remote memory reference data copies.  I am guessing that 

such a feature would be important in SGI's Tukwila based UltraViolet system, but am wondering 

if it is part of what will be supported on the soon-to-be-released Nehalem EPs?   A side 

questions would be "Does HyperTransport allow for something similar?" 



Thanks, 



rbw 





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