Resources

General information about MPI and MPICH 3:

MPI in Wikipedia
en.wikipedia.org/wiki/Message_Passing_Interface

High Performance Portable MPI: MPICH
MPICH

Documentation on MPICH 3
Tutorials, installers guides, users guides, FAQs, ...

An on-line MPI reference book (also in print) 
by Dongarra et Al from ORNL
www.netlib.org/utk/papers/mpi-book/mpi-book.html

References on GPU computing and the CUDA language