[Beowulf] LAM, MPICH, OpenMP?

[Ruhollah Moussavi Baygi]

Dear all at Beowulf,

As a conceptual question in the realm of parallel programming, what is the
difference between LAM/MPI, MPICH, and OpenMP? Could one say that all of
these are something like 'different compilers'  for  'one programming
language'?

My second doubt is about their ease of use as well as their efficiency AND
their compatibility with different distros.

Thanks for any coming guidance and explanations

-- 
Best,
Ruhollah Moussavi Baygi
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