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[Caml-list] OCaml speed
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Date: 2001-10-17 (05:32)
From: Doug Bagley <doug@b...>
Subject: Re: [Caml-list] OCaml speed
Rolf Wester wrote:
> Hi, 
> I used the array access example from http://www.bagley.org/~doug/shootout/
> to compare c/c++ speed against ocaml. The sources I used are attached below.
> Unfortunately I could not confirm the given cpu times which are 0.11 sec for
> gcc and 0.13 for ocamlopt. My results on a Compaq Alpha True64 are 
> 0.05 for cxx, 0.1 for g++ and 0.29 for ocamlopt. Does anybody have an idea 
> what could be the reason for this inconsistency? Did I do anything wrong?

I don't think you are necessarily doing anything "wrong", but you are
testing in a manner quite differently from me.

Some ideas:
- Our architectures are quite different, I'm using an old PII-450Mhz.
- I time the programs externally, you time them internally.
- I compile the ocaml source with:
  > ocamlopt -noassert -unsafe -ccopt -O3 ary.ml -o ary.run
  You apparently compiled with:  
  > ocamlopt -o aa_ml unix.cmxa aa.ml

The last one is probably what makes the most difference.

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