X-Spam-Check-By:	sourceware.org
From:	"Dave Korn" <dave DOT korn AT artimi DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	RE: segfault on memory intensive programs
Date:	Thu, 30 Mar 2006 13:39:55 +0100
Message-ID:	<064a01c653f7$0dca3120$a501a8c0@CAM.ARTIMI.COM>
MIME-Version:	1.0
In-Reply-To:	<20060330121802.GG20907@calimero.vinschen.de>
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Unsubscribe:	<mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com

On 30 March 2006 13:18, Corinna Vinschen wrote:

> On Mar 30 12:14, Dave Korn wrote:
>> On 30 March 2006 12:08, Corinna Vinschen wrote:
>> 
>> 
>>>>> #define  N          600 // Matrix rank
>>>>> 	// We multiply m1 and m2, and put the result in m3. 	int m1[N][N];
>>>>> 	int m2[N][N];
>>>>> 	int m3[N][N];
>> 
>>> No wonder.  600**3 * sizeof (int) * 3 == 2592000000 ~= 2.4 Gigs.
>> 
>>   Those matrices are only 2d!
> 
> Oh, hmm.  600**2 * sizeof (int) * 3 == 4320000 = 4.1 Megs.
> 
> Maybe reserving a stack bigger than 4Megs would help, though?
> 

  There's probably a hook dll loaded low into memory and messing it up.

  Setting a breakpoint somewhere in the middle of the loop, trapping it in
windbg, and posting the output from the "lm" command might just make things
clearer.


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/

- Raw text -