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From: Anil Madhavapeddy <anil@recoil.org>
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Date: Mon, 30 Sep 2013 10:13:07 +0100
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To: Fabrice Le Fessant <Fabrice.Le_fessant@inria.fr>
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Subject: Re: [Caml-list] from oasis to obuild (original subject was Re:
 Accelerating compilation)

On 30 Sep 2013, at 10:00, Fabrice Le Fessant <Fabrice.Le_fessant@inria.fr> =
wrote:

> On Mon, Sep 30, 2013 at 10:07 AM, Francois Berenger <berenger@riken.jp> w=
rote:
>> # time ./build.sh
>> real    0m9.397s
>>=20
>> Compile time after, with obuild:
>> # obuild clean && time (obuild configure && obuild build -j 1)
>> real    0m3.624s
>=20
> If you compile with "-j 1", where does the speed-up come from ? Is
> Oasis using bytecode commands instead of native-code commands ? Could
> you ask the two tools to display the commands they are calling, to
> understand the difference ?

OASIS runs every single build command through ocamlfind.  Moving that
to the configure phase gives a big speedup for almost any project
with a non-trivial number of source files.

-anil