MPICH is a freely available, portable implementation of MPI, the Standard for message-passing libraries.


Open MPI is an open source implementation of the Message Passing Interface, a library for distributed memory parallel programming.


Quality Example
More connection

"While openmpi supports more connection protocols there is an infiniband-enabled version of mpich called mvapich"

from question "What is difference between Hydra and Torque and what is better: MPICH2 or OpenMPI"


"It seems openmpi has better support for assigning ranks than mpich but setting up slurm and mpich wasn t trivial due to the cluster setup so i m hesitant to start over with openmpi"

from question "MPICH/SLURM assign host rank"

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