Useful Information to compile Infiniband with OpenMPI

Taken from the excellent OpenMPI FAQ. "How do I build Open MPI with support for Open IB (Infiniband), mVAPI (Infiniband), GM (Myrinet), and/or MX (Myrinet)?"

To compile OpenMPI against Infiniband
you only have to specify the directory where its support header files and libraries were installed to Open MPI's configure script

Build support for OpenFabrics (previously known as "Open IB", for Infiniband and iWARP networks -- note that iWARP support was added in the v1.3 series).
# ./configure --with-openib=/path/to/openib/installation

For more information on myrinet etc, do go to the FAQs.