Yes, if you have 3 GB + memory there will be no paging to
virtual memory (wherever located) in any case.  Virtual
memory is handled by the OS, not the application.   But
swap files on the hard disk (handled by the app) are used 
by many imaging programs to let them handle datasets which
exceed addressable space.  With older 8 bit and 16 bit
applications this was common - nowadays I'd have thought a
programme needing more than the 32-bit addressable space
would be written for a 64-bit OS.  But in principle a RAM
disk for the swap files could help speed things up for a 
32-bit app on a 64-bit OS.

                                        Guy



Optical Imaging Techniques in Cell Biology
by Guy Cox    CRC Press / Taylor & Francis
    http://www.guycox.com/optical.htm
______________________________________________
Associate Professor Guy Cox, MA, DPhil(Oxon)
Electron Microscope Unit, Madsen Building F09,
University of Sydney, NSW 2006
______________________________________________
Phone +61 2 9351 3176     Fax +61 2 9351 7682
Mobile 0413 281 861
______________________________________________
     http://www.guycox.net
-----Original Message-----
From: Confocal Microscopy List [mailto:[log in to unmask]] On Behalf Of Johan Henriksson
Sent: Saturday, 29 November 2008 4:01 AM
To: [log in to unmask]
Subject: Re: Leica LAF on 64 bit windows?

Martin Spitaler wrote:
> Just a note because WinXP-64bit discussions were on here before: Even 
> if the software doesn't support 64 bit, it should run faster because 
> the the 'virtual memory' the software is using (beyond 3GB) is 
> actually stored in RAM rather than on the harddrive.
this sounds really off to me. virtual memory works by taking a block of memory and putting it on the harddrive. the address does not change, there will simply be nothing to where it points. hence virtual memory *does not* extend your limit past 2gb or 3gb, whatever your OS has.

--
--
------------------------------------------------
Johan Henriksson
MSc Engineering
PhD student, Karolinska Institutet
http://mahogny.areta.org http://www.endrov.net

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