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Subject: Re: [AE] (OT) An example of a PC version of a Mac Pro with today's tech for AE
From: Brendan Bolles <brendan@fnordware.com>
In-Reply-To: <list-4744842@media-motion.tv>
Date: Tue, 12 Jun 2012 17:53:22 -0700
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References: <list-4744842@media-motion.tv>
To: "After Effects Mail List" <AE-List@media-motion.tv>

On Jun 12, 2012, at 2:10 PM, Stephen van Vuuren wrote:

> Chris, you confused about AE (which is a very rare thing). CS4 did not =
use
> HTT, but CS5 did - it was part of the launch marketing.


I wonder what the AE team meant when they said they used hyperthreading. =
 In general, it's the OS that needs to support hyperthreading, not =
individual programs.  The app just makes sure there are enough threads =
to go around and the OS takes care of the rest.  Maybe they made a few =
tweaks for the slightly different caching you can get under =
hyperthreading?

For the tests I did, I assumed that if I had 2 physical cores that were =
being completely utilized, that would be faster with hyperthreading =
turned off because there would be only 2 threads, which is less =
management than 4 threads with hyperthreading turned on.  But at least =
with a Core i7, this was not the case.  Hyperthreading was always faster =
for me.

BTW, it is possible for a program to tell how many physical processors =
are present apart from the number of logical processors.  But for most =
people I don't think there's any reason to do this.  Just use the =
logical processors and reap the hyperthreading benefits.


Brendan