From: Sam Steingold <sds@gnu.org>
To: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
Cc: caml-list@inria.fr
Subject: Re: compiling large file hogs RAM and takes a long time.
Date: Fri, 15 Jun 2007 11:41:28 -0400 [thread overview]
Message-ID: <4672B328.4030504@gnu.org> (raw)
In-Reply-To: <20070608.213010.99453104.garrigue@math.nagoya-u.ac.jp>
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Jacques Garrigue wrote:
>>> 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.
>
> I found the reason, and this is now fixed in CVS 3.10.
> I can now compile a pattern matching with 3000 cases in 10s and just
> 10MB, which is better than 40s and 250MB before :-)
I observe a time reduction of 40% (from 10 minutes down to 6 minutes)
and RAM usage reduction of 60% (from 450MB down to 160MB)
for my (generated) file.
Very nice, thanks!
> This doesn't change the quadratic time complexity, but as other
> mentioned, constants do matter.
Indeed, but it appears that in this case improving constants does not
solve the problem completely.
Sam.
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next prev parent reply other threads:[~2007-06-15 15:45 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 ` [Caml-list] " Jacques Garrigue
2007-06-08 1:51 ` 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 [this message]
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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