From: Jean-Christophe Filliatre <Jean-Christophe.Filliatre@lri.fr>
To: Jon Harrop <jon@jdh30.plus.com>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Gripes with array
Date: Thu, 9 Sep 2004 09:17:25 +0200 [thread overview]
Message-ID: <16704.901.571258.566181@gargle.gargle.HOWL> (raw)
In-Reply-To: <200409090310.29295.jon@jdh30.plus.com>
Jon Harrop writes:
>
> Does anyone have any pointers to information about the origin of the size
> limit for arrays? I assume it is something to do with the garbage collector
> using a fixed-size tag instead of a variable-size one but I'd be interested
> in the details.
In ocaml sources, the file byterun/mlvalues.h gives all details about
the block header structure. There you can see that, on 32 bits
architecture, the block size (in words) is stored on 22 bits. And
indeed Sys.max_array_length is equal to 2^22-1.
But I must agree with you: this is definitely too small and we could
imagine that, when the tag says a block is an array, the size is
stored within the first (or the last) field instead.
--
Jean-Christophe Filliâtre
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next prev parent reply other threads:[~2004-09-09 7:17 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-09 2:10 Jon Harrop
2004-09-09 5:08 ` Ville-Pertti Keinonen
2004-09-09 7:17 ` Jean-Christophe Filliatre [this message]
2004-09-09 8:23 ` Richard Jones
2004-09-09 9:08 ` Olivier Andrieu
2004-09-09 12:08 ` Basile Starynkevitch [local]
2004-09-09 12:31 ` Damien Doligez
2004-09-09 10:42 ` Gerd Stolpmann
2004-09-09 9:37 ` Damien Doligez
2004-09-09 10:34 ` Jean-Christophe Filliatre
2004-09-09 12:15 ` Igor Pechtchanski
2004-09-09 13:01 ` Brian Hurt
2004-09-09 20:08 ` [Caml-list] 32-bit is sticking around Brandon J. Van Every
2004-09-09 21:04 ` Jon Harrop
2004-09-11 15:30 ` Lars Nilsson
2004-09-11 16:24 ` [off topic] " David MENTRE
2004-09-11 17:52 ` Lars Nilsson
[not found] ` <200409111656.11952.jon@jdh30.plus.com>
2004-09-11 17:47 ` Lars Nilsson
2004-09-09 16:58 ` [Caml-list] Gripes with array Jon Harrop
2004-09-10 5:56 ` Array.init (was [Caml-list] Gripes with array) Christophe Raffalli
2004-09-10 8:53 ` Richard Jones
2004-09-10 14:50 ` Damien Doligez
2004-09-13 7:02 ` Christophe Raffalli
2004-09-10 13:45 ` [Caml-list] Gripes with array Damien Doligez
2004-09-11 1:43 ` skaller
2004-09-11 3:16 ` skaller
2004-09-11 14:36 ` Jon Harrop
2004-09-11 20:53 ` Damien Doligez
2004-09-12 15:33 ` Jon Harrop
2004-09-12 16:07 ` Basile Starynkevitch [local]
2004-09-10 23:48 ` brogoff
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