[Gllug] 4G Memory Restriction

Alain Williams addw at phcomp.co.uk
Mon Apr 10 12:22:16 UTC 2006

On Mon, Apr 10, 2006 at 01:17:58PM +0100, Steve Nelson wrote:

> > Note that a 64 bit box should run your 32 bit apps without change.
> > Only a few of your apps are (I suspect) going to need > 3GB memory,
> > these are the ones to recompile. If the others are difficult, don't
> > bother.
> Ok this is getting complicated now!  If I understand correctly, if I
> wish to migrate the current setup (32 bit kernel, 32 bit userland, 64
> bit architecture) to 64 bit throughout, I would need to recompile
> applications that required >3G addressable memory space?

Yes you would. Most/all linux 64 bit distros also have 32 bit libraries
so that ''legacy'' 32 bit applications will continue to run. This will
allow the system to run both 64 and 32 bit applications at the same time.

Alain Williams
Parliament Hill Computers Ltd.
Linux Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/

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