Begin by reading the C User's Guide for stokes which can be found at

http://www.math.colostate.edu/manuals/sunpro/c-compiler/user_guide/index.html

Pay particular attention to those sections that address parallel programming issues.

Next, experiment with various compiler switches in an attempt to get a matrix multiply code to produce the highest MegaFlop rating you can achieve.  Record the results of
your experiment in such a way that you can report your results to the class.