Is OpenMPI using Multicast for things like MPI_Bcast() ?
Some simple tests of really old versions (1.0.2) showed binary tree type performance, while latter versions gave me the same run time no matter how many CPU's I used.
Thus this lead me to believe that something like multicast is in use. Is it?
Brock Palen www.umich.edu/~brockp Center for Advanced Computing bro...@umich.edu (734)936-1985
