From: Alain Frisch <alain@frisch.fr>
To: "Dr. Thomas Fischbacher" <t.fischbacher@soton.ac.uk>
Cc: dmitry grebeniuk <gds-mlsts@moldavcable.com>,
"caml-list@inria.fr" <caml-list@inria.fr>
Subject: Re: [Caml-list] Memory statistics tool
Date: Thu, 24 Jul 2008 18:12:14 +0200 [thread overview]
Message-ID: <4888A9DE.5060706@frisch.fr> (raw)
In-Reply-To: <4888A37A.5090407@soton.ac.uk>
Dr. Thomas Fischbacher wrote:
> The OCaml manual gives no guarantee that Hashtbl.hash does not cons, so
> I cannot assume this.
Indeed, Hashtbl.hash can cons, but this does not contradict my point:
its result does not depend on the physical location of objects in memory
(if it did, it would be impossible to use this function at all).
> Now, without that guarantee, there is a nasty race
> condition in which the determination of the hash bucket causes objects
> to move in memory.
Yes, objects can move in memory, but what is wrong with that? Their new
hash value will remain the same.
-- Alain
prev parent reply other threads:[~2008-07-24 16:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-23 10:54 Dr. Thomas Fischbacher
2008-07-23 11:47 ` [Caml-list] " Daniel Bünzli
2008-07-23 12:40 ` Jan Kybic
2008-07-23 12:44 ` dmitry grebeniuk
2008-07-23 13:09 ` Dr. Thomas Fischbacher
2008-07-23 13:16 ` Alain Frisch
2008-07-24 12:48 ` Dr. Thomas Fischbacher
2008-07-24 15:14 ` Alain Frisch
2008-07-24 15:44 ` Dr. Thomas Fischbacher
2008-07-24 16:12 ` Alain Frisch [this message]
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