On Tue, Aug 11, 2009 at 08:30:59AM -0400, P. J. Alling scripsit:
> David Mann wrote:
>> On Aug 11, 2009, at 11:21 AM, Joseph McAllister wrote:
>>> When OS 10.6 comes out next month sometime, it's 64 bit architecture
>>> will run on any Intel based Mac going back to 2006. Gonna make
>>> Photoshop and Lightroom and Aperture scream. Although all Mac
>>> Photoshop users will have to wait for PS CS5 to get the good 64 bit
>>> code.
>>
>> Why will being 64-bit make it faster?
>
> That's a good question, as it all things being equal it usually
> doesn't.
64 bit should give you speed improvements if:
- you're doing lots of (the right sort of) gnarly floating point math
- have a large address space on-disk or in memory
- snuck in proper concurrency handling while you were producing the
64 bit version of the OS
The obvious advantage for image manipulation is getting more than
3.whatever GB of RAM (the 32 bit direct addressing limit) into one
address space. Ideally, everything about the image you're working on
goes into RAM and stays there until you hit save, and that's easier the
more RAM you've got, and 64 bit means you can have a lot more RAM.
-- Graydon
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