From: Jon Harrop <jon@ffconsultancy.com>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Scripting in ocaml
Date: Fri, 22 Dec 2006 12:35:12 +0000 [thread overview]
Message-ID: <200612221235.12273.jon@ffconsultancy.com> (raw)
In-Reply-To: <458AFC39.70707@philippewang.info>
On Thursday 21 December 2006 21:27, Philippe Wang wrote:
> If you want to do that, use Lisp...
Lisp is too slow.
> Or use sum types...
> type t = Int of int | Float of float | ...
Manual boxing is too verbose.
> OCaml forgets types at runtime!
Some type related information is certainly retained, e.g. to unbox float
arrays.
> This means that you can't know without a huge cost (cf. SafeUnmarshal
> costs), because what you can do in O(1) is to know whether a value is an
> int or a pointer...
I'd like to quantify this cost. I've read papers and heard work stating that
carrying run-time type information can be cheap but I see evidence that might
point to the contrary, e.g. F# is significantly slower than OCaml but it has
concurrent GC that was designed for a non-FPL.
In F#, you have run-time type information. Amongst other things, this allows
you to dispatch to more efficient type-specialised functions. For example,
you can write functions over polymorphic arrays and dispatch to optimised
BLAS versions for float arrays when the input happens to be a float array.
--
Dr Jon D Harrop, Flying Frog Consultancy Ltd.
Objective CAML for Scientists
http://www.ffconsultancy.com/products/ocaml_for_scientists
next prev parent reply other threads:[~2006-12-22 12:37 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-21 3:41 Denis Bueno
2006-12-21 4:34 ` [Caml-list] " Erik de Castro Lopo
2006-12-21 7:22 ` skaller
2006-12-21 9:12 ` Till Varoquaux
2006-12-21 9:18 ` Chad Perrin
2006-12-21 10:29 ` skaller
2006-12-21 20:21 ` Chad Perrin
2006-12-21 13:30 ` Serge Aleynikov
2006-12-21 13:52 ` skaller
2006-12-21 14:59 ` Serge Aleynikov
2006-12-21 20:25 ` Chad Perrin
2006-12-21 20:41 ` Daniel Bünzli
2006-12-21 22:16 ` Chad Perrin
2006-12-22 12:21 ` strong/weak typing terminology (was Re: [Caml-list] Scripting in ocaml) Daniel Bünzli
2006-12-22 16:51 ` Tom
2006-12-22 17:34 ` Daniel Bünzli
2006-12-22 18:16 ` skaller
2006-12-22 18:47 ` Daniel Bünzli
2006-12-22 19:42 ` skaller
2006-12-22 20:03 ` David Brown
2006-12-22 20:17 ` Chad Perrin
2006-12-23 3:48 ` skaller
2006-12-23 4:11 ` Chad Perrin
2006-12-22 20:19 ` Chad Perrin
2006-12-23 12:58 ` Daniel Bünzli
2006-12-23 16:06 ` Chad Perrin
2006-12-23 21:50 ` Tom
2006-12-26 6:10 ` Chad Perrin
2006-12-22 20:14 ` Chad Perrin
2006-12-21 21:11 ` [Caml-list] Scripting in ocaml Serge Aleynikov
2006-12-21 21:27 ` Philippe Wang
2006-12-21 22:06 ` Serge Aleynikov
2006-12-22 12:35 ` Jon Harrop [this message]
2006-12-21 22:19 ` Chad Perrin
2006-12-22 12:37 ` Jon Harrop
2006-12-22 18:52 ` Chad Perrin
2006-12-22 2:51 ` skaller
2006-12-22 15:20 ` Jon Harrop
2006-12-22 11:32 ` Jon Harrop
2006-12-23 18:50 ` Jon Harrop
2006-12-24 0:15 ` Serge Aleynikov
2006-12-24 3:30 ` skaller
2006-12-21 14:59 ` Richard Jones
2006-12-21 20:27 ` Chad Perrin
2006-12-21 23:35 ` Martin Jambon
2006-12-26 17:14 ` Aleksey Nogin
2006-12-26 23:36 ` Ian Zimmerman
2006-12-27 18:25 ` Aleksey Nogin
2006-12-27 18:39 ` Richard Jones
2006-12-27 19:20 ` Aleksey Nogin
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