Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm
Sender: cygwin-owner@sourceware.cygnus.com
Date: Mon, 17 Apr 2000 20:20:17 -0400
Message-Id: <200004180020.UAA25301@envy.delorie.com>
From: DJ Delorie <dj@delorie.com>
To: nikulin@actsw.amat.com
CC: cygwin@sourceware.cygnus.com
In-reply-to: <004e01bfa8bb$23346410$35758798@mis.amat.com>
	(nikulin@actsw.amat.com)
Subject: Re: Help! cygwin's malloc does not work
References:  <004e01bfa8bb$23346410$35758798@mis.amat.com>


> Basically, it looks like cygwin can not handle large memory allocations.

Open regedit (or regedt32) and find the key
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\

Create a new DWORD value there called "heap_chunk_in_mb" that contains
the maximum amount of memory (in Mb) your application needs (watch the
hex/decimal toggle).  Exit and restart all cygwin applications.

The default is 128 (i.e. 128Mb) if no registry key is set.

Here is a more interesting "max memory" program:

main()
{
  unsigned int bit=0x40000000, sum=0;
  char *x;

  while (bit > 4096) {
    x = malloc(bit);
    if (x)
      sum += bit;
    bit >>= 1;
  }
  printf("%08x bytes (%.1fMb)\n", sum, sum/1024.0/1024.0);

  return 0;
}

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