Re: [Caml-list] flambda optimization settings

[Mark Shinwell <mshinwell@janestreet.com>]

Thanks for these numbers, which I think are about in line with expectations.

At present the optimisation flags such as -O3 only need to be
specified when compilation (rather than linking) is occurring.  So if
your link command only lists previously-compiled files, there is no
need to specify such options.

Mark

On 12 May 2016 at 20:55, Nils Becker
<nils.becker@bioquant.uni-heidelberg.de> wrote:
>
>> Thus, it would be interesting and important to also compare with the
>> code produced by a 4.03 switch compiled without flambda.
>
> coming right up
>
> (different parameters, different machine, best of 5 -- it varies quite a
> lot)
>
> time (ocamlbuild -clean; ocamlbuild facs_run.native)
> 4.03.0    1.36s
> 4.03.0+flambda
> Oclassic  1.68s
> O2        2.1s
> O3        2.80s
>
>
> the actual run: time ./facs_run.native
>
> 4.03.0    23.3s
> 4.03.0+flambda
> Oclassic  24.2s
> O2        22.7s
> O3        20.1s
>
>
> so it seems compilation on flambda classic is still a bit slower than
> non-flambda; as is the run time. the gains of O3 over non-flambda are
> still significant, as is the difference O2 vs O3.
>
> n
>
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