On Dec 7, 2007 2:41 PM, Toon Knapen <[EMAIL PROTECTED]> wrote: > Greg Lindahl wrote: > > > > In real life (i.e. not HPC), everyone uses message passing between > > nodes. So I don't see what you're getting at. > > Many on this list suggest that using multiple MPI-processes on one and > the same node is superior to MT approaches IIUC. However I have the > impression that almost the whole industry is looking into MT to benefit > from multi-core without even considering message-passing. Why is that so?
Because most of the "real" world does everything in a single node. Given multi-cores, they have to move down the MT path. The complications and effort of mixing MT on a node with the MP between nodes -- absolutely required in our world -- is seen as too great compared with the performance benefit. Simply staying with multiple MP tasks, whether they are between nodes or within a node, is much simpler -- it's what we already do. No, the question of whether MP as we currently do it will scale to larger and larger systems remains to be seen, but that's another thread. -- Brian D. Ropers-Huilman, Director Systems Administration and Technical Operations Minnesota Supercomputing Institute <[EMAIL PROTECTED]> 599 Walter Library +1 612-626-5948 (V) 117 Pleasant Street S.E. +1 612-624-8861 (F) University of Minnesota Twin Cities Campus Minneapolis, MN 55455-0255 http://www.msi.umn.edu/ _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
