[Beowulf] multi-threading vs. MPI

Greg Lindahl lindahl at pbm.com
Mon Dec 10 19:46:31 EST 2007


On Sat, Dec 08, 2007 at 06:50:29PM -0300, Jones de Andrade wrote:

> Could someone clarify a bit better *why* would openMP be such a bad
> performer in comparison to MPI?

MPI always gets locality right.

I learned this lesson on the BBN Butterfly in the early 90s, it's
funny that it's still true.

-- greg

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