MPI parallel computing system implementation, SHMEM version

 MPICH is a robust and flexible implementation of the MPI (Message Passing
 Interface). MPI is often used with parallel or distributed computing
 projects. MPICH is a multi-platform, configurable system (development,
 execution, libraries, etc) for MPI. It can achieve parallelism using
 networked machines or using multitasking on a single machine.
 .
 This version is compiled with ch_shmem support, which runs in shared memory.
 This method is faster than ch_p4 or ch_p4mpd on SMP machines, but cannot be
 used on a cluster.