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Date: Mon, 3 Feb 2003 21:04:42 -0600
From: Joshua Daniel Franklin <joshuadfranklin AT yahoo DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: document heap_chunk_in_mb?
Message-ID: <20030204030442.GA2900@world-gov>
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> > Any volunteers to document heap_chunk_in_mb?  It's conspicuously missing
> > in the documentation, AFAICT.
> > 
> > Although, hmm, I haven't seen many complaints about this recently.  That's
> > odd.  Maybe the overflow code in the new malloc is actually working.
> 
> Sure. What does it do? :)

In more seriousness, where should this be documented? 

I found a couple of good posts, the best being DJ's:

http://sources.redhat.com/ml/cygwin/2000-04/msg00267.html

(though I believe the 'normal' max is now 256MB).
His test program (on my machine with 256MB physical memory) gives:

$ ./maxmem.exe 
1b5a4000 bytes (437.6Mb)

Perhaps a good place would be in the User's Guide under the discussion of 
shared memory in the "Highlights" section. Something like:

"By default Cygwin imposes a 256MB memory limit. To raise this limit,
you may create a "heap_chunk_in_mb" registry entry, for example:
 
regtool -i set /HKCU/Software/Cygnus\ Solutions/Cygwin/heap_chunk_in_mb 512

You will then need to reboot for it to take effect."

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