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| 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 |
