Bright:Using MPI

The Message Passing Interface (MPI) is a standardized and portable message passing system, designed to function on a wide variety of parallel computers. The standard defines the syntax and semantics of a core of library routines useful to a wide range of users writing portable message-passing programs in Fortran or the C programming language. MPI libraries allow the compilation of code so that it can be used over a variety of multiprocessor systems from SMP nodes to NUMA systems and interconnected cluster nodes.

Interconnects

Jobs can use particular networks for intra-node communication:

• Gigabit Ethernet: Gigabit Ethernet is the interconnect that is most commonly available. For Gigabit Ethernet, no additional modules or libraries are needed. The Open MPI, MPICH implementations will work over Gigabit Ethernet.
• InfiniBand: InfiniBand is a high-performance switched fabric which is characterized by its high throughput and low latency. Open MPI, MVAPICH and MVAPICH2 are suitable MPI implementations for InfiniBand.