From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: sds@gnu.org
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Re: compiling large file hogs RAM and takes a long time.
Date: Fri, 08 Jun 2007 10:02:55 +0900 (JST) [thread overview]
Message-ID: <20070608.100255.84973407.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <466829A3.2090508@gnu.org>
From: Sam Steingold <sds@gnu.org>
> update: the main problem is a polymorphic variant type with 3050
> variants and a function that returns its instances.
> chunking the type, i.e., replacing
> type foo=[|`A|`B|`C|`D]
> with
> type foo_1=[|`A|`B]
> type foo_2=[|`C|`D]
> type foo=[|foo_1|foo_2]
> (but with ~55 variants in ~55 types) did not help.
> Removing the type definition did solve the RAM problem - according to
> top(1), ocamlopt.opt was taking ~80MB, and it compiled the file in about
> 10 minutes.
>
> Any chance there is some quadratic code in polymorphic variant type
> processing?!
There is, and this is a known problem:
http://caml.inria.fr/mantis/view.php?id=4053
I'm sorry, but I don't see any easy way out.
At least on the basic time complexity.
However, the space complexity could be improved, if I find what is
gobbling memory so fast.
Jacques
next prev parent reply other threads:[~2007-06-08 1:03 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-06 16:30 Sam Steingold
2007-06-06 16:51 ` [Caml-list] " skaller
2007-06-06 17:05 ` Sam Steingold
2007-06-07 15:52 ` Sam Steingold
2007-06-08 1:02 ` Jacques Garrigue [this message]
2007-06-08 1:51 ` [Caml-list] " skaller
2007-06-08 2:26 ` Yaron Minsky
2007-06-08 9:05 ` Thomas Fischbacher
2007-06-08 9:35 ` skaller
2007-06-08 9:55 ` Thomas Fischbacher
2007-06-08 13:39 ` Sam Steingold
2007-06-08 12:30 ` [Caml-list] " Jacques Garrigue
2007-06-15 15:41 ` Sam Steingold
2007-06-15 18:56 ` [Caml-list] " Jon Harrop
2007-06-15 20:06 ` Sam Steingold
2007-07-09 20:22 ` large parametrized polymorphic variant type combinations take forever to compile Sam Steingold
2007-07-09 22:45 ` Sam Steingold
2007-07-09 23:37 ` [Caml-list] " Jacques Garrigue
2007-07-10 7:09 ` Christophe Raffalli
2007-07-10 7:31 ` Jacques Garrigue
2007-07-10 14:16 ` Sam Steingold
2007-07-10 16:49 ` Sam Steingold
[not found] ` <46938BDA.1090605@podval.org>
2007-07-11 0:10 ` [Caml-list] " Jacques Garrigue
2007-07-11 1:19 ` Jon Harrop
2007-07-11 2:23 ` Jacques GARRIGUE
2007-07-11 13:12 ` Sam Steingold
2007-07-11 19:17 ` [Caml-list] " Jon Harrop
2007-07-10 3:34 ` [Caml-list] " skaller
2007-07-10 13:27 ` Sam Steingold
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