Glenn,
If you're careful with $PATH and $LD_LIBRARY_PATH you can certainly do
this. One thing that makes this a little easier is the 'modules'
package (http://modules.sourceforge.net/). We use this to maintain 9
versions of OpenMPI for various reasons, along with 5 versions of LAM
and a version
I have an 8-way AMD64 system. I built a 64 bit open-mpi-1.1
implementation and then compiled software to use it. That all works
fine.
In addition, I have a 32 bit binary program (Schrodinger Jaguar) that I
would like to run on this machine with mpi. Schrodinger provides source
code to build an mpi