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Date: Wed, 30 Jun 2004 07:08:23 -0700
To: Dan Hatton <dan DOT hatton AT btinternet DOT com>, cygwin AT cygwin DOT com
From: Tim Prince <tprince AT computer DOT org>
Subject: Re: Cygwin Memory Allocation and heap_chunk_in_mb
In-Reply-To: <Pine.CYG.4.58.0406301444280.2112@ws3-mirp.geol.ucl.ac.uk>
References: <Pine DOT CYG DOT 4 DOT 58 DOT 0406301444280 DOT 2112 AT ws3-mirp DOT geol DOT ucl DOT ac DOT uk>
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At 06:54 AM 6/30/2004, Dan Hatton wrote:


>I'm using CYGWIN_NT-5.1, under XP Pro.
>
>I've set my heap_chunk_in_mb registry key to a very large value (10240
>decimal,) because I'm doing some RAM-hungry numerical calculations.
>
>I have enough space to do this (Control Panel->System reports 12 GB of
>virtual memory allocated.)
>
>However, the max_memory program at
><http://www.cygwin.com/ml/cygwin/2003-02/msg00234.html> still reports
>only 1.5 GB available.  Sure enough, my program dies with an "out of
>memory" error at 1.25 GB (the 0.25 GB discrepancy is about right for
>the amount of RAM other processes are using.)
>
>Anyone got any ideas what's happening, please?

cygwin doesn't emulate a 64-bit OS.  Did you try setting up XP with /3GB to 
see whether that would give another 1 GB, or check the archives for any 
reports on such an attempt?


Tim Prince 


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