If you also follow the rest of that thread, there's a message passing
OCaml version by Gerd Stolpmann which also scales properly.

To be honest, matrix multiplication interests me not at all since no
one is hand coding their own matrix multiplication when there are
perfectly good, parallel libraries available for most languages,
including OCaml.  Even if you were writing all your applications in C,
you'd still be stupid to hand roll your own matrix multiplication.
Let's have a real example instead.

Rich.

-- 
Richard Jones
Red Hat