[Beowulf] mem consumption strategy for HPC apps?
Robert G. Brown
rgb at phy.duke.edu
Mon Apr 18 12:41:12 EDT 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
... or rather half that (duh) as they're bidirectional.
> ... Unless I'm making egregious arithmetic errors again (very
> possible as longtime list humans know:-).
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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