Did you see the -j N option?

 > ocamlbuild -h
...
  -j <N>                      Allow N jobs at once (0 for unlimited)
...


Jon Harrop wrote:
> When I'm not cuddling my dual core, I enjoy using tools such as POVRay, 
> pbzip2, quake4-smp and ocamlbuild.
>
> Unfortunately, ocamlbuild only seems to spawn a single compile at a time, 
> leaving my other core twiddling its thumbs.
>
> Call me crazy, but I was thinking of forking ocamlbuild and doing a complete 
> rewrite in a high-level language like JoCaml. However, I fear my boss will 
> object on the grounds that finding me a successor versed in fringe languages 
> like JoCaml would be prohibitively difficult. I'll ask her when she's 
> finished making lunch but, in the mean time, what do you guys think?