From the frontpage of the lam's website (http://www.lam-mpi.org/
"LAM/MPI is now in a maintenance mode. Bug fixes and critical patches
are still being applied, but little real "new" work is happening in
LAM/MPI. This is a direct result of the LAM/MPI Team spending the vast
majority of their time working on our next-generation MPI
implementation -- Open MPI."
The site also states that, "Since it's an MPI implementation, you
should be able to simply recompile and re-link your applications to
Open MPI -- they should "just work." Open MPI contains many features
and performance enhancements that are not available in LAM/MPI."