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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: freebsd-chat@FreeBSD.ORG
References: <200711160756.lAG7uGA1017136@lurza.secnetix.de>
Date: Fri, 16 Nov 2007 14:47:26 +0100
In-Reply-To: <200711160756.lAG7uGA1017136@lurza.secnetix.de> (Oliver Fromme's
	message of "Fri\, 16 Nov 2007 08\:56\:16 +0100 \(CET\)")
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Cc: 
Subject: Re: C out-of-bound pointer question
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Oliver Fromme <olli@lurza.secnetix.de> writes:
> It is true that the k[] array in v2.0 uses 1 GB of mapped memory,
> *BUT* it does not use 1 GB of RAM.  It only uses one page of physical
> RAM.  Remember that RAM is allocated dynamically when it is accessed
> for the first time, so if you never access k[0..268435409], then no
> RAM will be allocated for it.  Of course, you should make sure that it
> is a local variable (or a malloc()ed one) that is not initialized, or
> otherwise the initialization will cause RAM to be allocated.  Make
> sure you initialize only the indices that you need.

It can't be a local variable; it's larger than the stack.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no