On Tue, Nov 07, 2006 at 05:02:54PM +0000, Miguel Figueiredo Mascarenhas Sousa Filipe wrote:
> if your aplication is on one given node, sharing data is better than > copying data. Unless sharing data repeatedly leads you to false sharing and a loss in performance. > the MPI model assumes you don't have a "shared memory" system.. > therefore it is "message passing" oriented, and not designed to > perform optimally on shared memory systems (like SMPs, or numa-CCs). For many programs with both MPI and shared memory implementations, the MPI version runs faster on SMPs and numa-CCs. Why? See the previous paragraph... -- greg
