Per this morning's telecon, I have added the latest scaling test results to the wiki:
https://svn.open-mpi.org/trac/ompi/wiki/ORTEScalabilityTesting As you will see upon review, the trunk is scaling about an order of magnitude better than 1.2.x, both in terms of sheer speed and in the strength of the non-linear components of the scaling law. Those of us working on scaling issues expect to make additional improvements over the next few weeks. Update results will be posted to the wiki as they become available. Ralph