RE: W2K RAMlimits

["Laurie Solomon" <laurie@advancenet.net>]

Jim,
I just re-read my post which you quoted and think I remember some of the
practical reasons why RAM disks may not be efficient.  One has to do with
the fact that Photoshop relies on scratch disks to hold the various multiple
copies of the image file that is open and being worked on as I noted below;
but it uses RAM for the working copy that is displayed on the desktop.  Thus
if the scratch disk was a RAM disk, Photoshop could not communicate with and
use both the RAM and the RAM disk simultaneously but would have to alternate
access and use between them which would cause a slow down that very well
could reduce any efficiencies of a RAM disk to that of the virtual memory
which relies on a scratch disk located on a hard drive.

I do not know if this makes any sense ; but it is what I remember or got out
of the discussion.

-----Original Message-----
From: owner-epson-inkjet@leben.com
[mailto:owner-epson-inkjet@leben.com]On Behalf Of Jim Wingo
Sent: Friday, June 14, 2002 7:04 AM
To: epson-inkjet@leben.com
Subject: RE: W2K RAMlimits


In the vein of pure speculation: might it be possible, if one had literally
gigs of RAM, to set up a RAM disk to be used as the PS scratch disk? Would
this not be the equivalent to working intirely in RAM on large files?

Jim Wingo

*********** REPLY SEPARATOR  ***********

On 6/13/2002 at 8:36 PM Laurie Solomon wrote:

>>it means you can work on those 550Mb medium format scans without endless
disk  writes
>
>If you are using Photoshop, I doubt it since Photoshop still relies on
>virtual memory from scratch disks requiring disk writes and reads no
matter
>how much actual physical RAM you have on the system.  It keeps multiple
>copies of the file in its various versions on the scratch disk not RAM for
>multiple undos, for the history palette, and for the revert function for
>starters. It is only possibily the actual working desktop appearing copy
>that it keeps in actual physical RAM.



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