The question of OpenMP vs MPI has been around for a long time, for example:
http://www.beowulf.org/archive/2001-March/002718.html My general impression is that it is a waste of time to convert from pure MPI to a hybrid approach. For example: www.sc2000.org/techpapr/papers/pap.pap214.pdf 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 My own view is that with a modern cluster with fast processors and with inter-node communications not that much slower than a cache miss to main memory, the unified MPI model makes more sense, but there are many many papers arguing about this topic. -L
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