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Is OCaml fast?
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Date: -- (:)
From: Oliver Bandel <oliver@f...>
Subject: Threading and SharedMem (Re: [Caml-list] Re: Is OCaml fast?)
Zitat von "Gerd Stolpmann" <info@gerd-stolpmann.de>:

> Am Sonntag, den 28.11.2010, 19:14 +0100 schrieb
> oliver@first.in-berlin.de:
>> On Thu, Nov 25, 2010 at 11:50:58PM +0100, Fabrice Le Fessant wrote:
>> [...]
>> >  The main problem was that other languages have bigger standard
>> > libraries, whereas OCaml has a very small one (just what is needed
>> > to compile the compiler, actually). In many problems, you could
>> > benefit from using a very simple shared-memory library (in
>> > mandelbrot, the ocaml multicore solution has to copy the image in a
>> > socket between processes, whereas it could just be in a shared
>> > memory segment),
>>
>>
>> ...so you work on a shared-mem module?!
>
> Don't know what Fabrice is referring to, but at least I work on a
> multicore-enabling library:
>
> https://godirepo.camlcity.org/svn/lib-ocamlnet2/trunk/code/src/netmulticore/
>
> This is work in progress and highly experimental. What's currently
> available:
>
> - managing processes and resources like files, shared memory objects
>   etc.
> - support for message passing via Netcamlbox (another library)
> - low-level only so far: shared memory, including copying Ocaml values
>   to and from shm
[...]

You use shared mem(?), but you link only to *.ml files,
and I see no *.c there.

How can this be done?

At least not via the libs that are shipped with OCaml?!

I would have expected some *.c for the shared mem part and
the creation of Caml-values....


Ciao,
    Oliver

P.S.: OCaml also provides a Thread-Lib, which seems to use pthread-lib.
       Normally this should help in making things possible to run on multiple
       cores. What are the restrictions  that this does not run that way?
       Somehow... when all values are handled via one GC, then those threads
       are somehow bound together, but on the other side, it works threaded,
       and consumer-worker pipes and such stuff can be used.
       So... somehow the GC seems to be the point, where the show will be
       stopped? (Anyone who has looked inside OCaml here more detailed?)