> 1) (Cross) compiling.  Which of mips r12000, power4 and usparcIII are best 
> supported so that my existing code runs well?

SPARC/Solaris and MIPS/IRIX are well supported, SPARC perhaps a bit better.
The POWER/AIX port of OCaml isn't really supported because I don't
have such a machine at hand.  (And also because AIX is a pain.)

> How do I cross-compile (if I need to), given that there are math
> libraries (BLAS, LAPACK) that I need to link to on the target
> platform?  To run ocamlopt on the target machine, at a minimum I
> need to cross-compile ocamlrun, right?

You do not need to cross-compile: just build the OCaml distribution on
the target machine, and compile your program on the target machine as well.

> 2) Threads vs. MPI.  Writing threaded code for an SMP node would be
> the simplest way for me to harness many CPUs at the same time.  But
> what's thread support like on different platforms (listed below)
> with OCaml?

OCaml threads do not exploit shared-memory multiprocessing --
basically, all threads interleave their execution, hence multiple
processors are not exploited.  Your best bet is MPI or PVM.  Both have
bindings for OCaml.

Hope this helps,

- Xavier Leroy

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