Re: [Caml-list] from oasis to obuild (original subject was Re: Accelerating compilation)

[Sylvain Le Gall <sylvain@le-gall.net>]

Hello,

On 30-09-2013, Francois Berenger <berenger@riken.jp> wrote:
> On 09/07/2013 05:51 AM, Fabrice Le Fessant wrote:
> > [...]
>> FWIW, I recently compiled Merlin with both ocamlbuild and ocp-build,
>> on a quad-core with "-j 10" for both (the link to the ocp-build
>> description file is in the latest OCamlPro's report), ocamlbuild needs
>> 13s where ocp-build only needs 4s to compile everything.
>
> I recently switched from oasis to obuild.
>
> The main reason I adopted oasis in the past is because the project
> description file (_oasis) is very short.
>
> With ocp-build, (as far as I know) I would have to list all the files
> my program/libraries need to be built, and I am too lazy for that.
>
> But now, I have a project.obuild file instead, which
> is as terse as an _oasis file.
>
> Here is my project.obuild file:
> ---
> Name:         something
> Version:      0.1
> Authors:      me
> License:      GPL
> Synopsis:     some_more_things
> obuild-ver:   1
>
> Executable ac
>    Path:           .
>    BuildDepends:   batteries, dolog, parmap, vector3, biniou, atd, atdgen
>    MainIs:         ac.ml
>
> [...] some other executables follow
> ---
>
> Compile time before, with oasis:
>
> # cat build.sh
> #!/bin/bash
>
> #set -x
>
> oasis setup
> ocaml setup.ml -configure
> ocaml setup.ml -build
>
> # time ./build.sh
> real    0m9.397s
>
> Compile time after, with obuild:
> # obuild clean && time (obuild configure && obuild build -j 1)
> real    0m3.624s
>

Note that given the proximity of obuild and _oasis files it should be
super easy to just convert 1 time the _oasis file to foo.obuild and keep
using _oasis while changing the build backend from ocamlbuild to obuild.

OASIS is not building anything by itself, the time you report is
probably 90% due to ocamlbuild (the build backend).

BTW, this kind of _oasis -> obuild conversion is a topic I have
discussed with the author of obuild and I am 100% willing to do the
conversion plugin if it makes sense.


Regards
Sylvain

> -- 
> Best regards,
> Francois Berenger.
>
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Cheers,
Sylvain Le Gall
-- 
Website:     http://sylvain.le-gall.net/
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