Re: Dual Core and Photoshop CS

Chris Cox wrote: 
In article <cfydncteEpCWzFXfRVn-3w@xxxxxxxxxxx>, Clyde
<clyde@xxxxxxxxxxxx> wrote:


Hecate wrote:

On Sat, 02 Jul 2005 09:42:58 -0500, Clyde <clyde@xxxxxxxxxxxx> wrote:

I know it is technically different, but is it practically different? My Windows XP Pro sees my HyperThread as two separate processors, even though it isn't. Well, all of XP's performance tools sees it as 2 CPUs. Since Photoshop runs on top of XP, it can only use what XP tells it to use. Photoshop doesn't see the 2nd processor that XP says it there.

My big "IF" was an extrapolation of that. If XP Pro would see two processors in a Dual Core chip, I would think that it would allocate different processes to them, much like it does with HT. I would certainly hope that it is more efficient in the way it runs, but XP probably wouldn't allocate it any differently. I would hope that Dual Core would act more like true multi-processing.

However, if Photoshop doesn't know how to use the "two" processors that XP thinks are there with HT, why would it suddenly get smarter on a Dual Core machine? I'm thinking that it wouldn't -- with the current Photoshop for Windows.


Yes. They are both effectively, and practically, two different things.
It will show 2 different processors and PS should see two different
processors. The difference is that single processor HT chips have all
pipelines dedicated to them. Dual chips have two sets of pipelines.

--

Hecate - The Real One
Hecate@xxxxxxxxxxx Fashion: Buying things you don't need, with money
you don't have, to impress people you don't like...

My point is: how does anyone know if they are practically different? 


Yes.
Anyone who's read up on them should know.



We do a lot of talk in the newsgroups, but I haven't seen anything here or anywhere that has hard test numbers for Dual Core. How does it actually work with Photoshop? 


Pretty well.



As far as I can tell, no one knows. 


Oh, so you haven't read any of the reviews around the net?



Has Adobe upgraded Photoshop to be dual processor/dual core/HyperThread aware on XP? 


No, because it has been multiprocessor aware since version 3.0.

But you won't get a big win out of HyperThreading because you still
have the same bandwidth limitations (one chip, one pipeline to memory),
and HyperThreading only has the functional units of a single processor
to play with.
But you will see some HT advantage on some compute bound operations.

Dual Core - that's almost the same as 2 processors (slightly different
bandwidth limits since they're in a single package, but close).  You'll
see a lot more advantage from dual core chips than from HyperThreading.

Chris

I guess the reviews of CS2 and Dual Core that I have read never put the two together. I would love any links that you have that are better.

Thanks,
Clyde
.

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