Bright:Using MPI
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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.
Preparing and Running an MPI Application
- Load the correct compiler and the corresponding MPI implementation modules