Re: [PCI] Virtual memory

[darm0k]

At 02:32 PM +1000 06/22/2004, David Elmo wrote:
 > Photoshop is one of those programs that doesn't like VM. It has its
 own virtual-memory scheme which will conflict with system VM.
Not quite sure if this is right in respect to PS? Is there any stated info
by Adobe that there is any actual conflict? PS likes you to have a scratch
disk different to the vol on which VM is and also (btw) different to the one
which has any large files you are editing.
It is 100% correct, +/- your definition of "conflict".  Well 
documented on Adobe's web sites, Photoshop's docs, USENET, and 
various other forums.

Photoshop caches temp data in basically three ways: normal temp files 
on disk, special scratch disk partitions, RAM.

The algorithms used to cache data are a faux virtual memory.  They're 
so poorly implemented, they cause the Mac OS' virtual memory manager 
to thrash.  They often easily drag HFS/+ formatted hard drives to 
their knees.

Adobe's fix for this is for you to:
a) make fewer modifications on your image (save, quit, relaunch often),
b) add lots of real memory,
c) dedicate a HD scratch partition or preferrably a whole HD,
d) turn off virtual memory,
and
e) blame Apple.
IMO, Adobe needs a kick in the a**.  Apps like GraphicConverter 
perform the same functions without the whole thrash problem!  If GC 
et al can do it, why can't Adobe?  ObConspiracy: How much stock in 
the RAM manufacturers does Adobe own? :)

- Dan.
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