On Tue, Oct 02, 2007 at 02:52:21PM -0400, Larry Stewart wrote: > On the other hand, here's a fellow who got a 4X speedup by going to hybrid: > > www.nersc.gov/nusers/services/training/classes/NUG/Jun04/NUG2004_yhe_hybrid.ppt
It's always hard to evaluate how real such claims are. But I will note that this guy is on an IBM SP, which for a while (dunno if it's fixed now) had some really horribly slow MPI library code for in-box communications. Code so bad that it made OpenMP and hybrid programming look good. He also claims MM5 gets a win with hybrid programming, but the numbers I've seen say that pure MPI is best on that code. -- greg _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
