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I was wondering how these two are related to each other. Could anyone here explain?
Cheers.
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MPI is a standard library for performing parallel processing using a distributed memory model. The Ruby, Owens, and Pitzer clusters at OSC can use the OpenMPI implementation of the Message Passing Interface (MPI).
MPICH is a high performance and widely portable implementation of the Message Passing Interface (MPI) standard. MPICH and its derivatives form the most widely used implementations of MPI in the world.
If you have a problem that is small enough to be run on just one node, use OpenMP. If you know that you need more than one node (and thus definitely need MPI), but you favor code readability/effort over performance, use only MPI.
The sm BTL is a low-latency, high-bandwidth mechanism for transferring data between two processes via shared memory. This BTL can only be used between processes executing on the same node. Note. Between Open MPI version 1.8.
They are two implementations of the MPI standard. In the late 90s and early 2000s, there were many different MPI implementations, and the implementors started to realize they were all re-inventing the wheel; there was something of a consolidation. The LAM/MPI team joined with the LA/MPI, FT-MPI, and eventually PACX-MPI teams to develop OpenMPI. LAM MPI stopped being developed in 2007. The code base for OpenMPI was completely new, but it brought in ideas and techniques from all the different teams.
Currently, the two major open-source MPI implementation code-bases are OpenMPI and MPICH2.
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