Re: [Caml-list] Accelerating compilation

[Jacques Le Normand <rathereasy@gmail.com>]

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So is anyone working on accelerating compilation? Has any of these
proposals been deemed superior to the others?
On Sep 11, 2013 9:24 PM, "Francois Berenger" <berenger@riken.jp> wrote:

> On 09/11/2013 10:46 PM, Wojciech Meyer wrote:
>
>> What are you trying to prove here?
>>
>
> I am not trying to prove anything.
> I just manage to show something, which is the whole point of a good plot.
>
> > Makefiles will be always faster as
>
>> mentioned before, however there is still space for vast improvement, the
>> biggest elephant here being slow scanning. Patches welcome.
>>
>> Also, it does not show the convenience of using ocamlbuild, in
>> particular dynamic dependency resolver, nice language for specyfing
>> complex rules, tags, and VPATH build that just works (does your makefile
>> VPATH at all?)
>>
>>
>>
>> On Wed, Sep 11, 2013 at 2:00 PM, Francois Berenger <berenger@riken.jp
>> <mailto:berenger@riken.jp>> wrote:
>>
>>     On 9/7/13 5:51 AM, Fabrice Le Fessant wrote:
>>
>>         On Fri, Sep 6, 2013 at 5:20 PM, Romain Bardou
>>         <romain.bardou@inria.fr <mailto:romain.bardou@inria.fr**>> wrote:
>>
>>                     3) Parallel compilation in Ocamlbuild
>>
>>                     Of course it would help but it is not easy to
>>                     implement so I'm just
>>                     putting it there to be exhaustive.
>>
>>
>>                 I'm not sure what you are referring to, OCamlBuild does
>>                 already
>>                 support parallel builds.
>>
>>
>>             Does it? I actually thought the -j option was ignored.
>>
>>             I just did a quick test and I gain about 5 seconds with -j
>>             on a 1min15
>>             build (I had cleaned, recompiled and recleaned before so
>>             that caching by
>>             the file system would not impact the result too much), so it
>>             does seem
>>             to be a *little* faster :)
>>
>>
>>         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.
>>
>>
>>     This morning, I played with a Makefile and ocamlbuild
>>     to build batteries-included from a clean source tree.
>>
>>     The Makefile was provided by Cedric Cellier.
>>
>>     Here follows the wallclock times to build on my eight cores machine.
>>
>>     #You can plot them like this:
>>     cat <<EOF > make_Vs_ocamlbuild.data
>>     #nprocs Makefile ocamlbuild
>>     1 14.52 21.43
>>     2 6.84 17.57
>>     3 4.95 16.44
>>     4 4.18 15.95
>>     5 3.70 15.67
>>     6 3.36 15.62
>>     7 3.12 15.54
>>     8 3.03 15.292
>>     EOF
>>     gnuplot -persist <<EOF
>>     set title 'make Vs ocamlbuild'
>>     set xlabel 'nprocs'
>>     set ylabel 'wallclock time(s)'
>>     plot 'make_Vs_ocamlbuild.data' u 1:2 w lines title 'time -p make
>>     fast -j np', \
>>                                  '' u 1:3 w lines title 'ocamlbuild -j np'
>>     EOF
>>
>>
>>
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>>
>>
>>
>
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