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X-Authentication-Warning: localhost.localdomain: ronald owned process doing -bs
Date: Thu, 13 Feb 2003 10:20:58 +0100 (CET)
From: Ronald Landheer-Cieslak <ronald AT landheer DOT com>
X-X-Sender: ronald AT localhost DOT localdomain
To: "Charles D. Russell" <worwor AT bellsouth DOT net>
cc: cygwin cygwin <cygwin AT cygwin DOT com>
Subject: Re: Memory for large arrays in cygwin/g77
In-Reply-To: <001d01c2d300$333b9a00$d16bd6d1@oemcomputer>
Message-ID: <Pine.LNX.4.44.0302131019350.28178-100000@localhost.localdomain>
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This is getting to be a FAQ...

There is a (configurable) limit to the amount of memory Cygwin can 
allocate.

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, Charles D. Russell wrote:
> Using cygwin/g77, I was happy with a memory limitation of something over 240
> Mb when I was using a laptop with 64 Mb of physical memory. However, I
> recently acquired a new PC with 512 Mb of physical memory and found that the
> memory available for array allocation did not increase, remaining little
> over 240 Mb. The same phenomenon occurs with f2c as with g77. I can do a
> little better in straight C, with something over 600 Mb available on the new
> computer, but only by declaring the arrays dynamically. What is going on? (I
> am not a programmer, just a number cruncher.)
> 
> I have explored accessible memory by means of the subsequent test program,
> edited in several obvious ways.
> 
> implicit double precision (a-h,o-z)
> c ny=300 works (240 Mb), 400 doesnt (message about heap)
> parameter(nx=100000,ny=300)
> dimension a(nx,ny)
> c dimension a1(nx,ny)
> write(6,*) 'megabytes= ',nx*ny*8/1d6
> a(1,1)=1d0
> a(nx,ny)=1d0
> write(6,*) 'extremes initialized'
> end
> 
> 
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