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Date:	Wed, 12 Feb 2003 18:01:00 +0100 (CET)
From:	Ronald Landheer-Cieslak <ronald AT landheer DOT com>
X-X-Sender:	ronald AT localhost DOT localdomain
To:	Kris Warkentin <kewarken AT qnx DOT com>
cc:	dl AT cs DOT oswego DOT edu, <cygwin AT cygwin DOT com>
Subject:	Re: Malloc failing too soon under XP/2000
In-Reply-To:	<053001c2d2b3$a64a95c0$0202040a@catdog>
Message-ID:	<Pine.LNX.4.44.0302121759220.14138-100000@localhost.localdomain>
MIME-Version:	1.0

Charles Werner explains this pretty well in:
http://sources.redhat.com/ml/cygwin/2003-02/msg00234.html
he also explains how to change the settings

ciao

rlc

On Wed, 12 Feb 2003, Kris Warkentin wrote:

> I'm running Windows XP with 1/2GB RAM and 2GB swap.  Running Cygwin 1.3.18.
> Consider the following program to use as much memory as possible:
> 
> #include <stdio.h>
> #include <malloc.h>
> 
> int
> main()
> {
>         void *x;
>         unsigned long long mem=0;
> 
>         while((x=malloc(500000)) != NULL){
>                 mem += 500000;
>                 memset(x, 0, 500000);
>                 printf("allocated %u\n", mem);
>         }
>         return 0;
> }
> 
> If I compile and run this, it consistently stops at about 780MB.  If I
> compile with -mno-cygwin, it doesn't fail until almost 2GB have been
> allocated.
> 
> Any comment?  Is there some sort of flag I can compile with to make the
> allocator more aggressive?  The situation it's failing in is one where a
> very large library is being linked and ld is running out of memory in spite
> of quite a bit being available.
> 
> cheers,
> 
> Kris
> 
> 
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