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From:	"lhall AT pop DOT ma DOT ultranet DOT com" <lhall AT pop DOT ma DOT ultranet DOT com>
To:	kewarken AT qnx DOT com, dl AT cs DOT oswego DOT edu, cygwin AT cygwin DOT com
Subject:	RE: Malloc failing too soon under XP/2000
Date:	Wed, 12 Feb 2003 11:39:37 -0500
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X-OriginalArrivalTime:	12 Feb 2003 16:39:37.0715 (UTC) FILETIME=[5505C430:01C2D2B5]
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Try this:

http://sources.redhat.com/ml/cygwin/2001-01/msg00733.html

Larry

Original Message:
-----------------
From: Kris Warkentin kewarken AT qnx DOT com
Date: Wed, 12 Feb 2003 11:27:34 -0500
To: dl AT cs DOT oswego DOT edu, cygwin AT cygwin DOT com
Subject: Malloc failing too soon under XP/2000


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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