[Beowulf] mem consumption strategy for HPC apps?

Robert G. Brown rgb at phy.duke.edu
Mon Apr 18 09:41:12 PDT 2005

On Mon, 18 Apr 2005, Robert G. Brown wrote:

> The COST of this (in time) on (say) 100 BT is at least 100 usec per face
> to start talking to a node plust 0.5/10 MB/sec = 0.05 seconds, bandwidth
> dominated.  To do all six faces requires 0.3 seconds.  If you organize
> your code carefully you can probably find a pattern that does all of the
> bidirectional communications in parallel for all nodes in the SAME 0.3
> seconds.

... or rather half that (duh) as they're bidirectional.

> ... Unless I'm making egregious arithmetic errors again (very
> possible as longtime list humans know:-).


  rgb (again)

Robert G. Brown	                       http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb at phy.duke.edu

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