From: Noel Welsh <noelwelsh@yahoo.com>
To: "Gurr, David \(MED, self\)" <David.Gurr@med.ge.com>
Cc: caml-list@inria.fr
Subject: RE: ocaml, simd, & fftwgel RE: [Caml-list] Caml productivity.
Date: Fri, 2 Aug 2002 02:57:56 -0700 (PDT) [thread overview]
Message-ID: <20020802095756.99352.qmail@web11208.mail.yahoo.com> (raw)
In-Reply-To: <D4DBD8568F05D511A1C20002A55C008C09C294F6@uswaumsx03medge.med.ge.com>
--- "Gurr, David (MED, self)" <David.Gurr@med.ge.com>
wrote:
>
> But do they do a better job than fftwgel or Spiral
> or Atlas?
I have no idea :)
> Is SAC available for public inspection?
Yeah: http://www.informatik.uni-kiel.de/~sacbase/
I couldn't find a paper that describes how ATLAS is
implemented. I'm guessing the most important
optimisations are blocking (dependant on the cache
size) and condensing consequetive array transversals.
SAC does both these optimisations.
> Once you do this, it is much less
> clear what
> the value added of the C compiler is. In
> particular, the amount of
> refinement that would be needed to get ocamlopt to
> match C compilers
> at this task might be relatively small ... since C
> is notoriously
> difficult to optimize even without SIMD.
Yeah, it is kinda ironic that C is famous for
generating such fast C. The functional model (pure
functional code is essentially an SSA register
machine) is much closer to current hardware than the C
every-has-an-address/stack model. So it should be
possible to get fast code out of a functional language
with less effort than C. It is also a bit amusing,
and a bit sad, that Java and .Net both use a stack
model (it's like they want slow code!)
Noel
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next prev parent reply other threads:[~2002-08-02 9:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-02 2:56 Gurr, David (MED, self)
2002-08-02 9:57 ` Noel Welsh [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-08-01 15:36 Damien Doligez
2002-08-01 16:38 ` John Max Skaller
2002-08-01 16:55 ` Alexander V.Voinov
2002-08-01 16:45 ` Jonathan Coupe
2002-07-30 17:58 Gurr, David (MED, self)
2002-07-31 1:29 ` Travis Bemann
2002-07-31 8:09 ` Xavier Leroy
2002-07-31 8:39 ` Noel Welsh
2002-08-01 15:22 ` John Max Skaller
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