X-Spam-Check-By: sourceware.org
From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: [FAQ alert] RE: segfault on memory intensive programs
Date: Thu, 30 Mar 2006 15:07:19 +0100
Message-ID: <065d01c65403$4232d320$a501a8c0@CAM.ARTIMI.COM>
MIME-Version: 1.0
Content-Type: text/plain; 	charset="us-ascii"
Content-Transfer-Encoding: 7bit
In-Reply-To: <20060330135049.70352.qmail@web34801.mail.mud.yahoo.com>
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
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 14:51, Pete wrote:


> It reports back 1536 MB.   Very strange!  The registry
> setting appears to not be having an effect.

  1.5 Gig is about the most it's possible to get under 'doze.  The address
space of the processor is 4gig, the upper 2 gig (addr >= 0x80000000) belong to
the kernel, the lower 2 gig belong to user-land.  Take away 512k at the top of
that for the space where the dll's load (0x600000000 - 0x7fffffff), and what
you're left with is what you get.

  As to the FAQ entry, it really needs a little alteration.  Ping JDF!

  It should make clear that those parameters are in bytes.  The example of a
4k stack and 1k heap is a bit unrealistic and it might be more productive to
show people how to make exes with /big/ stacks, since that's the problem
people usually run into.  How about something a bit more like

-------------------------------------------------------------<snip>
21. 	

How can I adjust the heap/stack size of an application?
	
If you need to change the maximum amount of memory available to Cygwin, see
http://cygwin.com/cygwin-ug-net/setup-maxmem.html. Otherwise, just pass the
desired heap/stack size in bytes as linker arguments to gcc. To create foo.exe
with a heap size of 200MB and a stack size of 8MB, you would invoke gcc as:

gcc -Wl,--heap,200000000,--stack,8000000 -o foo foo.c 
-------------------------------------------------------------<snip>

    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/