Re: Dual Core and Photoshop CS

On Sat, 02 Jul 2005 09:42:58 -0500, Clyde <clyde@xxxxxxxxxxxx>
reverently intoned upon the aether:

> Hecate wrote:
> > On Fri, 01 Jul 2005 14:47:52 -0500, Clyde <clyde@xxxxxxxxxxxx> wrote:
> >
> >
> >
> >>If (big IF) Dual Core works like HT on Intel processors, you won't get
> >>much from it in Photoshop. Photoshop doesn't use my "extra" processor in
> >>my Intel 3.2 GHz Prescott.
> >
> >
> > It doesn't. What Intel does with HT (and why it often causes PS to
> > slow down) is to *emulate* a dual core processor.
> >
> > Dual Core processors are exactly what the3y sound like *2* processors
> > on 1 chip. And it makes quite a lot of difference ;-)
> >
> > --
> >
> > 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...
>
> I know it is technically different, but is it practically different?

Yes. The longer answer:

http://arstechnica.com/articles/paedia/cpu/hyperthreading.ars

There are situations where hyperthreading can really make a huge
performance difference in some apps if they are hyperthreading aware
and it can hurt performance on others that are not hyperthreading
aware.

Check out the media encoding benchmarks here to get an idea:

http://www.tomshardware.com/cpu/20050603/index.html

>
> 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.

It is true multi-processing. Whereas hyperthreading is actually a
change in CPU scheduling methods.

>
> 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.

They behave differently. Once Adobe gets a few of their more CPU
intensive filters to take advantage of hyperthreading (if they ever
do), then that too may help.

some thoughts,

Sean


"In the End, we will remember not the words of our enemies,
but the silence of our friends."

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Last Updated 23 June 2005
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