Re: [Caml-list] Sundials/ML 2.5.0

[Gabriel Scherer <gabriel.scherer@gmail.com>]

Thanks for the significant effort put in documenting the bindings
(and, of course, the cool software and research); your "information
and documentation" page is impressive.

The page has a very interesting performance comparison of numeric code
partly or fully written in OCaml (using bigarrays of floats) -- and
the not-so-surprising results is that the run times of the OCaml
programs are between 100% and 200% of the run time of the reference C
implementation.

( http://inria-parkas.github.io/sundialsml/perf.opt.png )

I'm curious about this specific part of the explanation:

> For instance, some OCaml versions spend a significant fraction of their time
> in printf, and we were able to lower their ratios by instead using print_string and print_int.

The new 4.02 implementation of formats, due to Benoît Vaugon, should
be significantly faster (in my experience they match the performance of the
less-readable print_* sequence in most situations). Did you try those
OCaml versions with 4.02?

On Fri, Nov 28, 2014 at 2:39 PM, Timothy Bourke <Timothy.Bourke@inria.fr> wrote:
> We are pleased to announce Sundials/ML, an OCaml interface to the
> Sundials suite of numerical solvers (CVODE, CVODES, IDA, IDAS, KINSOL).
>
> Information and documentation: http://inria-parkas.github.io/sundialsml/
> Source code (BSD):             https://github.com/inria-parkas/sundialsml
>
> opam install sundialsml # (requires Sundials 2.5.0)
>
> We gratefully acknowledge the original authors of Sundials, and the
> support of the ITEA 3 project 11004 MODRIO (Model driven physical
> systems operation), Inria, and the Departement d'Informatique de l'ENS.
>
> Timothy Bourke, Jun Inoue, and Marc Pouzet.
>